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The human lung adenocarcinoma cell line EKVX produces an infectious xenotropic murine leukemia virus.
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PMID:  22355448     Owner:  NLM     Status:  MEDLINE    
The cell lines of the NCI-60 panel represent different cancer types and have been widely utilized for drug screening and molecular target identification. Screening these cell lines for envelope proteins or gene sequences related to xenotropic murine leukemia viruses (X-MLVs) revealed that one cell line, EKVX, was a candidate for production of an infectious gammaretrovirus. The presence of a retrovirus infectious to human cells was confirmed by the cell-free transmission of infection to the human prostate cancer cell line LNCaP. Amplification and sequencing of additional proviral sequences from EKVX confirmed a high degree of similarity to X-MLV. The cell line EKVX was established following passage of the original tumor cells through nude mice, providing a possible source of the X-MLV found in the EKVX cells.
Joan L Cmarik; Jami A Troxler; Charlotte A Hanson; Xiang Zhang; Sandra K Ruscetti
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Intramural     Date:  2011-12-19
Journal Detail:
Title:  Viruses     Volume:  3     ISSN:  1999-4915     ISO Abbreviation:  Viruses     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-02-22     Completed Date:  2012-06-27     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  101509722     Medline TA:  Viruses     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  2442-61     Citation Subset:  IM    
Laboratory of Cancer Prevention, National Cancer Institute-Frederick, Frederick, MD 21702, USA.
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Bank Name/Acc. No.:
GENBANK/JN861040;  JN861041;  JN861042
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MeSH Terms
Adenocarcinoma / virology*
Base Sequence
Cell Line, Tumor
Genes, Viral / genetics
Leukemia Virus, Murine / genetics,  metabolism*
Leukemia, Experimental / virology
Lung Neoplasms / virology*
Mice, Nude / virology
Molecular Sequence Data
Polymerase Chain Reaction
Retroviridae Infections / virology
Sequence Alignment
Tumor Virus Infections / virology
Viral Envelope Proteins / genetics
Reg. No./Substance:
0/Viral Envelope Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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Journal Information
Journal ID (nlm-ta): Viruses
Journal ID (publisher-id): viruses
ISSN: 1999-4915
Publisher: MDPI
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© 2011 by the authors; licensee MDPI, Basel, Switzerland.
Received Day: 26 Month: 10 Year: 2011
Revision Received Day: 22 Month: 11 Year: 2011
Accepted Day: 09 Month: 12 Year: 2011
Electronic publication date: Day: 19 Month: 12 Year: 2011
collection publication date: Month: 12 Year: 2011
Volume: 3 Issue: 12
First Page: 2442 Last Page: 2461
ID: 3280514
PubMed Id: 22355448
DOI: 10.3390/v3122442
Publisher Id: viruses-03-02442

The Human Lung Adenocarcinoma Cell Line EKVX Produces an Infectious Xenotropic Murine Leukemia Virus
Joan L. Cmarik*
Jami A. Troxler
Charlotte A. Hanson
Xiang Zhang
Sandra K. Ruscetti
Laboratory of Cancer Prevention, National Cancer Institute-Frederick, Frederick, MD 21702, USA; Email: (S.K.R.)
* Author to whom correspondence should be addressed;; Tel.: +1-301-846-5641; Fax: +1-301-846-6164.

1. Introduction

Continuous cell lines established from human cancer specimens are critical to cancer research. Biosafety guidelines have been established for handling these cell lines because of the potential presence of infectious agents. The NCI-60 panel comprises cell lines derived from human tumors from various organs (Table 1). The panel was developed by the Developmental Therapeutics Program (DTP) of the National Cancer Institute (NCI) as an in vitro drug screening tool [1], and at the time of its establishment, all cell lines were tested for known pathogens [2]. The NCI-60 panel is currently used to screen up to 3000 synthetic compounds or natural products per year for potential anticancer activity and is also frequently used for molecular target identification ( The DTP has supplied the cell lines of the panel to a large number of other research laboratories. Because of their widespread use, the discovery of xenotropic murine leukemia virus-related virus (XMRV) prompted us to screen the NCI-60 cell lines for previously undetected infectious retroviruses.

XMRV is a type C gammaretrovirus first identified in human prostate tumors [55], although considerable controversy surrounds the detection of XMRV in human samples [56,57]. The prostate cancer cell line 22Rv1 produces infectious XMRV [58], but other prostate cancer cell lines, e.g., DU145 and LNCaP, do not [59]. Hue et al. [60] recently reported that 2.2% of a large number of cell lines tested by PCR were positive for xenotropic murine leukemia virus (X-MLV) gag sequence. We used immunoblotting and PCR assays capable of detecting XMRV and other X-MLVs to screen the NCI-60 panel of tumor cell lines.

2. Results and Discussion
2.1. The Lung Cancer Cell Line EKVX Tested Positive by Both Immunoblotting for Viral Envelope Protein and by PCR for gag and env Viral Gene Sequences

Total protein lysates were prepared from all 60 cell lines. Viral envelope protein (Env, also known as gp70) was detected by immunoblotting with monoclonal antibody 7C10 [61], which was raised against the envelope protein of Friend spleen focus-forming virus and which cross-reacts with XMRV and other X-MLV envelope proteins. A positive signal was detected in the lysate of only 1 cell line, EKVX (Table 1 and Figure 1A), a lung adenocarcinoma– derived cell line [26]. As a second means of screening for virus, PCR for XMRV and X-MLV– related gag and env sequences was performed. In concordance with the immunoblotting results, only EKVX yielded prominent bands of the expected size with both the env and gag primers, 533 bp and 731 bp, respectively (Table 1 and Figures 1B and 1C). This result is consistent with Hue et al. [60], who detected MLV-like sequences in EKVX by PCR. To rule out the possibility that EKVX cultures or derived materials were contaminated with mouse cells or DNA containing endogenous X-MLVs that could give rise to the env and gag products, we used nested PCR as described by Ono et al. [62] to test for the presence of mouse mitochondrial DNA. Although we could reliably detect 1/106 equivalents of mouse genomic DNA spiked into human genomic DNA, no mouse mitochondrial PCR products were observed with up to 250 ng of EKVX genomic DNA (data not shown). We were also unable to detect mouse DNA contamination using a single-round (45 cycles) PCR assay for intracisternal A particles (IAP) [63] on up to 600 ng of EKVX genomic DNA (Figure 1D). The mouse IAP products are ~200-300 bp; the ~100 bp band in the HCT-116 lane may be a primer dimer product, as it was observed frequently in no template controls in additional experiments.

We observed a faint ladder of background bands in all cell lines with the env primers. Therefore, we tested a subset of first round env products with nested primers, and a band of the appropriate size was only detected with EKVX (data not shown). The first round background bands were not observed in two representative cell line DNA samples (HCT-116 and DU145) spiked with a small amount (1/106) of genomic DNA containing the target DNA sequence (data not shown). Because no mouse DNA was detected in HCT-116 or DU145 genomic DNA using the IAP assay (Figure 1D), the background bands may have been the result of mispriming on human DNA sequences. A few cell lines gave rise to products of incorrect size with the gag primers (e.g., HCT-116 in Figure 1C), but no corresponding envelope PCR product was observed, and no product was detected using nested primers for gag (data not shown).

Lung can serve as a point of entry for virus infection. A search of the GEO database [64] reveals numerous examples of expression of the X-MLV/XMRV receptor XPR1 [65] in human lung cells. Although potential contamination with mouse sequences was not ruled out, XMRV sequences were reported in human respiratory secretions [66], suggesting that lung could be a target for MLV-like viruses. However, all 8 of the other lung cancer cell lines in the NCI-60 panel and 4 additional lung cancer cell lines [NCI-H1666, NCI-H650, NCI-H2122, NCI-H358; obtained from M. Lerman, NCI (data not shown)] that we tested by immunoblotting were negative for MLV-like virus.

2.2. EKVX Produces Virus Capable of Infecting Human Cells

Cell-free supernatants were prepared from cultures of EKVX cells. Reverse transcriptase activity was detected in the EKVX supernatant using manganese, but not magnesium (data not shown), indicative of a mammalian type C retrovirus reverse transcriptase [67]. The ability of the EKVX viral supernatant to infect and spread in human cells was assessed using the human prostate cancer cell line LNCaP. LNCaP cells pretreated with polybrene were incubated with cell-free EKVX supernatant or fresh media (negative control). Cells were subcultured and total protein lysates were prepared at 10 and 16 days post-infection. Analysis by immunoblotting with monoclonal antibody 7C10 and with goat anti-Rauscher MLV p30 indicated the presence of capsid and envelope viral proteins in the lysate (Figure 2), indicating the establishment and spread of infection from the EKVX supernatant.

2.3. The EKVX Virus Is a Xenotropic Murine Leukemia Virus

The nucleotide sequences of the gag and env PCR fragments amplified from EKVX genomic DNA were determined. Sequences of the EKVX gag and env fragments were more closely related to X-MLVs than to XMRV (98% vs. 87% identity for gag; 99% vs. 92% identity for env). Based on these results, primers were designed to amplify additional regions in the LTR, gag, and env based on the sequence of DG-75 X-MLV. The sequences of these PCR products were determined and are aligned with representative XMRV and X-MLV sequences in Figure 3. The LTR-gag region of the EKVX virus lacks several of the defining characteristics of XMRV while aligning with 99% identity with the X-MLV sequence; most notably, it lacks the 14 bp deletion found in U3 and the short additions and 24 bp deletion found in the gag-leader of XMRV (Figure 3A). The primer binding sites for the EKVX sequence and the X-MLV sequence shown in Figure 3A are complementary to Gln-tRNAs, whereas that for XMRV is complementary to Pro-tRNA [68]. Gln-tRNA binding sites have been reported for numerous endogenous MLVs [69,70,71]. Also of note within the gag-leader region, MLV sequences contain an alternative (CTG) start codon, upstream of the ATG start codon, that yields a glycosylated precursor (glyco-Gag) [72]. In contrast to XMRV, which has an in-frame stop codon that precludes glyco-Gag synthesis [55], there is no stop codon between the CTG and ATG gag start codons and they are in frame with each other, suggesting that the EKVX virus should produce glyco-Gag. The env region (Figure 3B) lacks the trinucleotide G insertion found in XMRV, and the env-LTR region (Figure 3C) is missing the same 14 bp deletion in U3 as noted in Figure 3A. Together, these sequence data confirm that the EKVX virus is more closely related to X-MLVs than to the reported sequences of XMRV.

Xenotropic MLVs are so named because they can infect non-mouse species but cannot infect most laboratory strains of mice. X-MLV sequences are present as endogenous viruses in all laboratory and some house mouse strains [73,74,75,76,77], and endogenous viruses can be activated to produce infectious virus under certain conditions such as chemical or radiation exposure or immune induction [78,79,80,81,82]. Because EKVX was derived by passage through a nude mouse [26], the virus in the cell line may have been present in the original tumor or may have been acquired from nude mouse cells producing X-MLV. Several instances of human tumors and cell lines passed through nude mice having acquired viruses from the host have been reported [83,84,85,86,87,88,89]. However, not all cells passaged in mice acquire a virus. Indeed, four other cell lines of the NCI-60 panel are known to have been established after passage through mice (Table 1), and these tested negative for X-MLVs. The propensity for acquisition of a virus may depend on the strain of mouse, the means of immune suppression, the characteristics of the xenografted tumor, and whether the experimental protocol includes any additional factors (chemical exposure, radiation) that could promote the activation of an endogenous virus. Suzuki et al. [86] found that cells from 6/9 tumors transplanted into nude mice produced infectious murine type-C virus. Lusso et al. [85] found that cells recovered from all 6 human hematopoietic tumors studied that were transplanted into splenectomized, irradiated, and anti-asialo-GM1–treated nude mice acquired X-MLV infections. In other studies in which a variety of solid tumors were implanted as xenografts in nude mice or mice treated with mouse thymocyte antiserum, only 1/9 [87], 1/12 [84], and 2/11 [88] xenografts were associated with type C retroviruses. Intriguingly, Tralka et al. [88] reported IAP production in the human osteosarcoma cells that had acquired X-MLV infection. In a recent study, Zhang et al. [89] found evidence that 6/23 (mouse DNA-free) human cell lines established following passage through mice had been infected with X-MLV. Because of the possibility that the EKVX human lung cancer cell line acquired its X-MLV upon passage through nude mice, our study sheds no light on the controversy of whether X-MLV infections occur naturally in the human population.

The identification of a human infectious retrovirus in a commonly handled cell line is of concern on multiple counts: 1) unknown risk of infection and health risks to persons exposed to the virus, 2) unanticipated influence of infection and expression of viral proteins on experimental results [85,86], and 3) risk of spread of infectious virus to other cultured cell lines [89]. Infection of cells with X-MLV significantly altered the interactions of HIV-1 with those cells compared to their uninfected counterparts [85]. With respect to the potential for unintended spread of the virus among cultures, two reported examples of X-MLV in human cell lines that had not been transplanted into mice appear to have resulted from vertical transmission of virus from another infected cell line [90,91]. Zhang et al. [89] found that non-xenograft cell lines maintained in a xenograft-free facility showed no evidence of MLV infection, whereas 17% of non-xenograft cell lines cultured in laboratories that also maintained xenograft cultures became infected with MLV. Our study indicates that the X-MLV present in the EKVX cell line has not spread to other cell lines of the NCI-60 panel maintained by the DTP.

Our results confirm the findings of Sfanos et al. [92], who published the results of a similar study while this manuscript was in preparation for publication. They tested 58 of the 60 cell lines of the NCI-60 panel, and like us, found EKVX to be the only one of these cell lines expressing an X-MLV. An important difference between their study and ours is that the cell lines tested by Sfanos et al. were obtained from the NCI and then cultured in their own laboratory, whereas our initial screen was conducted on materials (DNA and cell pellets) directly supplied by the DTP, providing an additional level of confidence that the virus is present in the source cell line maintained by the DTP. Additionally, we utilized a different envelope antibody and different PCR primers, further strengthening the validity of the findings of both papers.

3. Experimental Section
3.1. Cell Line Materials and Cell Culture

Frozen cell pellets and genomic DNA were obtained from the DTP. EKVX cells were obtained from the DTP, and LNCaP cells were obtained from the laboratory of F. Ruscetti, NCI. Both cell lines were cultured in RPMI supplemented with penicillin/streptomycin and 10% fetal bovine serum.

3.2. Immunoblotting

Total protein lysates were prepared as previously described [93], and 30 μg were subjected to electrophoresis on 4-12% Bis-Tris gels (Invitrogen, Carlsbad, CA) with MOPS buffer and transferred to nitrocellulose. Monoclonal antibody 7C10 [61], polyclonal goat antisera against Rauscher MLV p30 (NCI, Bethesda, MD), and β-actin antibody (Novus Biologicals, Littleton, CO) were used as primary antibodies. Detection was accomplished with horseradish peroxidase-labeled secondary antibodies and enhanced chemiluminescent substrate (Thermo Scientific, Rockford, IL). XMRV-infected LNCaP cell lysate, provided by F. Ruscetti, was used as a positive control.

3.3. PCR

PCR for XMRV gag sequences was carried out on 75 ng of genomic DNA in a 25 μl reaction using primers 419F and 1154R and conditions as previously described [94] except the final concentration of each primer was 0.2 μM and the extension step was shortened to 45 s. PCR for XMRV env sequences was carried out similarly with primers 5922F (5′-GCTAATGCTACCTCCCTCCTGG) and 6454R (5′-GGCCCTACATTGAGGACCTGG) with an annealing temperature of 58°C. Hot-StartIt FideliTaq (USB, Cleveland, OH) was used for PCR. No template (water) controls and an XMRV-infected positive control (provided by F. Ruscetti) were included. In some cases, 150 ng genomic DNA was spiked with 1.5 pg or 0.15 pg (0.15 pg/150 ng approximates 1 provirus copy per cell) plasmid DNA containing the XMRV env sequence (provided by F. Ruscetti). Nested PCR was carried out on 1.5 µl of the first round product in a 25 μl reaction as previously described for gag [94] and at an annealing temperature of 58°C using primers 5942F (5′-GGGGACGATGACAGACACTTTCC) and 6271R (5′-GAGCCCACTGAGGAATCAAAACAG) for env. PCR products were analyzed by electrophoresis on 1.5-2% agarose gels and staining with ethidium bromide.

Nested PCR was carried out as described [62] to test for the presence of mouse mitochondrial DNA in 250 ng EKVX genomic DNA. Single-round PCR for intracisternal A particles (IAP) for 45 cycles on up to 600 ng of EKVX genomic DNA was carried out as published [63].

Additional PCR products were generated for sequencing using Finnzyme Phusion polymerase (New England Biolabs, Ipswich, MA) with up to 200 ng genomic DNA in 100 µl reactions containing the HF buffer supplied by the manufacturer, 200 μM dNTPs, and 0.5 μM each primer. Primers were designed to amplify regions in the LTR, gag, and env based on the sequence of DG-75 X-MLV (GenBank accession no. AF221065). Primers and conditions used were: DG-75 7762F (5′-CAAGCTAGCTGCAGTAACGCCATT) and DG-75 287R (5′-CAGACGCAGGCGCAAACATTAGAT) with initial denaturation for 30 s at 98°C followed by 35 cycles of denaturation at 98°C for 8 s and annealing/extension at 72°C for 15 s, followed by a final extension at 72°C for 7 min; DG-75 7607F (5′-AAAGGCAGAATTTCGGTGGTGCAG) and DG-75 7968R (5′-TGCTGGTTCCGCTTTATCTGGGTA) with the same conditions; and DG-75 7945R (5′-TACCCAGATAAAGCGGAACCAGCA) and DG-75 664R (5′-AGGGTCAGACTCAAAGGAGTGGTT) with initial denaturation for 30 s at 98°C followed by 35 cycles of denaturation at 98°C for 8 s, annealing at 70°C for 20 s, and extension at 72°C for 26 s, followed by a final extension at 72°C for 7 min. Products were separated on 2% agarose gels and extracted using a QiaexII Gel Extraction Kit (Qiagen, Valencia, CA).

3.4. Sequencing and Alignment

Sanger sequencing was performed by the Laboratory of Molecular Technology, SAIC-Frederick. Sequences were assembled using Geneious v5.1.6 [95]. Sequences were aligned with representative XMRV and X-MLV sequences using Clustal W2 ( [96,97]. Sequences have been deposited with GenBank with accession numbers JN861040, JN861041, and JN861042.

3.5. Cell-free Virus Transmission Assay

Supernatants were collected from cultures of EKVX cells 24 hours after a media change and were passed through 0.45 μm filters. For virus infection, subconfluent LNCaP cells in 6-well dishes were pretreated with polybrene (4 μg/ml), then the media was removed and replaced with cell-free EKVX supernatant or fresh media (negative control) containing polybrene (2 μg/ml). After 5 hours incubation, the media was changed in each well. Cells were subcultured and total protein lysates were prepared at 10 and 16 days post-infection. Analysis for viral proteins by immunoblotting was carried out.

4. Conclusions

The human lung adenocarcinoma cell line EKVX produces an X-MLV that is infectious to human cells. Because the EKVX cell line was established following the passage of the original tumor cells in nude mice, the source of the virus may be the activation of an endogenous virus in the mouse rather than the original human tumor. Regardless of the origin of the X-MLV in the cell line EKVX, its discovery serves as a reminder to handle all human-derived cell lines, even those tested for known human pathogens, with caution.


We thank Frank Ruscetti, Kathryn Jones, Ying Huang, John Coffin, and Michael Alley for helpful discussions. We appreciate the materials provided by the tumor repository of the NCI Developmental Therapeutics Program, Frank Ruscetti, and Michael Lerman, and are grateful for the technical assistance provided by Cari Sadowski and Dan Bertolette. This research was supported by the Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research.

Conflict of Interest

The authors declare no conflict of interest.

1.. Shoemaker R.H.. The NCI60 human tumour cell line anticancer drug screenNat. Rev. CancerYear: 2006681382316990858
2.. Alley M.C.,Scudiero D.A.,Monks A.,Hursey M.L.,Czerwinski M.J.,Fine D.L.,Abbott B.J.,Mayo J.G.,Shoemaker R.H.,Boyd M.R.. Feasibility of drug screening with panels of human tumor cell lines using a microculture tetrazolium assayCancer Res.Year: 1988485896013335022
3.. Hackett A.J.,Smith H.S.,Springer E.L.,Owens R.B.,Nelson-Rees W.A.,Riggs J.L.,Gardner M.B.. Two syngeneic cell lines from human breast tissue: the aneuploid mammary epithelial (Hs578T) and the diploid myoepithelial (Hs578Bst) cell linesJ. Natl. Cancer Inst.Year: 19775817951806864756
4.. Soule H.D.,Vazguez J.,Long A.,Albert S.,Brennan M.. A human cell line from a pleural effusion derived from a breast carcinomaJ. Natl. Cancer Inst.Year: 197351140914164357757
5.. Cailleau R.,Young R.,Olive M.,Reeves W.J. Jr.. Breast tumor cell lines from pleural effusionsJ. Natl. Cancer Inst.Year: 1974536616744412247
6.. Keydar I.,Chen L.,Karby S.,Weiss F.R.,Delarea J.,Radu M.,Chaitcik S.,Brenner H.J.. Establishment and characterization of a cell line of human breast carcinoma originEur. J. CancerYear: 197915659670228940
7.. Cailleau R.,Olive M.,Cruciger Q.V.. Long-term human breast carcinoma cell lines of metastatic origin: preliminary characterizationIn VitroYear: 197814911915730202
8.. Rutka J.T.,Giblin J.R.,Dougherty D.Y.,Liu H.C.,McCulloch J.R.,Bell C.W.,Stern R.S.,Wilson C.B.,Rosenblum M.L.. Establishment and characterization of five cell lines derived from human malignant gliomasActa Neuropathol.Year: 198775921032829496
9.. Rutka J.T.,Giblin J.R.,Hoifodt H.K.,Dougherty D.V.,Bell C.W.,McCulloch J.R.,Davis R.L.,Wilson C.B.,Rosenblum M.L.. Establishment and characterization of a cell line from a human gliosarcomaCancer Res.Year: 198646589359023019542
10.. Gross J.L.,Behrens D.L.,Mullins D.E.,Kornblith P.L.,Dexter D.L.. Plasminogen activator and inhibitor activity in human glioma cells and modulation by sodium butyrateCancer Res.Year: 1988482912963121170
11.. Kornblith P.L.,Smith B.H.,Leonard L.A.. Response of cultured human brain tumors to nitrosoureas: correlation with clinical dataCancerYear: 1981472552657459816
12.. CNS cell lines SNB-19 and U251 are derived from the same individual Available online:
13.. Bigner D.D.,Bigner S.H.,Ponten J.,Westermark B.,Mahaley M.S.,Ruoslahti E.,Herschman H.,Eng L.F.,Wikstrand C.J.. Heterogeneity of genotypic and phenotypic characteristics of fifteen permanent cell lines derived from human gliomasJ. Neuropathol. Exp. Neurol.Year: 1981402012296260907
14.. Semple T.U.,Quinn L.A.,Woods L.K.,Moore G.E.. Tumor and lymphoid cell lines from a patient with carcinoma of the colon for a cytotoxicity modelCancer Res.Year: 19783813451355565251
15.. Brattain M.G.,Fine W.D.,Khaled F.M.,Thompson J.,Brattain D.E.. Heterogeneity of malignant cells from a human colonic carcinomaCancer Res.Year: 198141175117567214343
16.. Dexter D.L.,Barbosa J.A.,Calabresi P.. N,N-dimethylformamide-induced alteration of cell culture characteristics and loss of tumorigenicity in cultured human colon carcinoma cellsCancer Res.Year: 19793910201025427742
17.. Fogh J.,Trempe G.. New human tumor cell linesHuman Tumor Cells In VitroFogh J.Plenum PressNew York, NY, USAYear: 1975115159
18.. Morikawa K.,Walker S.M.,Jessup J.M.,Fidler I.J.. In vivo selection of highly metastatic cells from surgical specimens of different primary human colon carcinomas implanted into nude miceCancer Res.Year: 198848194319483349467
19.. Leibovitz A.,Stinson J.C.,McCombs W.B. 3rd,McCoy C.E.,Mazur K.C.,Mabry N.D.. Classification of human colorectal adenocarcinoma cell linesCancer Res.Year: 197636456245691000501
20.. Foley G.E.,Lazarus H.,Farber S.,Uzman B.G.,Boone B.A.,McCarthy R.E.. Continuous culture of human lymphoblasts from peripheral blood of a child with acute leukemiaCancerYear: 19651852252914278051
21.. Collins S.J.,Gallo R.C.,Gallagher R.E.. Continuous growth and differentiation of human myeloid leukaemic cells in suspension cultureNatureYear: 1977270347349271272
22.. Lozzio C.B.,Lozzio B.B.. Human chronic myelogenous leukemia cell-line with positive Philadelphia chromosomeBloodYear: 197545321334163658
23.. Minowada J.,Onuma T.,Moore G.E.. Rosette-forming human lymphoid cell lines. I. Establishment and evidence for origin of thymus-derived lymphocytesJ. Natl. Cancer Inst.Year: 1972498918954567231
24.. Matsuoka Y.,Moore G.E.,Yagi Y.,Pressman D.. Production of free light chains of immunoglobulin by a hematopoietic cell line derived from a patient with multiple myelomaProc. Soc. Exp. Biol. Med.Year: 1967125124612506042436
25.. Beckwith M.,Urba W.J.,Longo D.L.. Growth inhibition of human lymphoma cell lines by the marine products, dolastatins 10 and 15J. Natl. Cancer Inst.Year: 1993854834888445676
26.. Aamdal S.,Fodstad O.,Kaalhus O.,Pihl A.. Chemosensitivity profiles of human cancers assessed by the 6-day SRC assay on serially xenografted tumorsInt. J. CancerYear: 1986375795873957463
27.. Fodstad O.,Aamdal S.,McMenamin M.,Nesland J.M.,Pihl A.. A new experimental metastasis model in athymic nude mice, the human malignant melanoma LOXInt. J. CancerYear: 1988414424493346110
28.. Sulit H.L.,Golub S.H.,Irie R.F.,Gupta R.K.,Grooms G.A.,Morton D.L.. Human tumor cells grown in fetal calf serum and human serum: influences on the tests for lymphocyte cytotoxicity, serum blocking and serum arming effectsInt. J. CancerYear: 197617461468945229
29.. MDA-MB-435 is a melanoma cell line, not a breast cancer cell line Available online:
30.. Brinkley B.R.,Beall P.T.,Wible L.J.,Mace M.L.,Turner D.S.,Cailleau R.M.. Variations in cell form and cytoskeleton in human breast carcinoma cells in vitroCancer Res.Year: 198040311831297000337
31.. Rae J.M.,Creighton C.J.,Meck J.M.,Haddad B.R.,Johnson M.D.. MDA-MB-435 cells are derived from M14 melanoma cells--a loss for breast cancer, but a boon for melanoma researchBreast Cancer Res. Treat.Year: 2007104131917004106
32.. Carey T.E.,Takahashi T.,Resnick L.A.,Oettgen H.F.,Old L.J.. Cell surface antigens of human malignant melanoma: mixed hemadsorption assays for humoral immunity to cultured autologous melanoma cellsProc. Natl. Acad. Sci. U.S.A.Year: 197673327832821067619
33.. Giard D.J.,Aaronson S.A.,Todaro G.J.,Arnstein P.,Kersey J.H.,Dosik H.,Parks W.P.. In vitro cultivation of human tumors: establishment of cell lines derived from a series of solid tumorsJ. Natl. Cancer Inst.Year: 197351141714234357758
34.. McLemore T.L.,Adelberg S.,Czerwinski M.,Hubbard W.C.,Yu S.J.,Storeng R.,Wood T.G.,Hines R.N.,Boyd M.R.. Altered regulation of the cytochrome P4501A1 gene: novel inducer-independent gene expression in pulmonary carcinoma cell linesJ. Natl. Cancer Inst.Year: 198981178717942555530
35.. McLemore T.,Alley M.,Liu W.,Hubbard W.,Adelberg S.,Czerwinski M.,Yu S.,Stinson S.,Storeng R.,Eggleston J.,Boyd M.. Histopathologic, biochemical and molecular genetic characterization of four newly established human pulmonary carcinoma cell linesProceedings of the American Association for Cancer ResearchSan Francisco, CA, USAMay 1989225
36.. Carney D.N.,Gazdar A.F.,Bepler G.,Guccion J.G.,Marangos P.J.,Moody T.W.,Zweig M.H.,Minna J.D.. Establishment and identification of small cell lung cancer cell lines having classic and variant featuresCancer Res.Year: 198545291329232985257
37.. Gazdar A.F.,Minna J.D.. NCI series of cell lines: an historical perspectiveJ. Cell. Biochem. Suppl.Year: 1996241118806089
38.. Falzon M.,McMahon J.B.,Gazdar A.F.,Schuller H.M.. Preferential metabolism of N-nitrosodiethylamine by two cell lines derived from human pulmonary adenocarcinomasCarcinogenesisYear: 1986717223080252
39.. Gazdar A.F.,Linnoila R.I.,Kurita Y.,Oie H.K.,Mulshine J.L.,Clark J.C.,Whitsett J.A.. Peripheral airway cell differentiation in human lung cancer cell linesCancer Res.Year: 199050548154872386953
40.. Benard J.,Da Silva J.,De Blois M.C.,Boyer P.,Duvillard P.,Chiric E.,Riou G.. Characterization of a human ovarian adenocarcinoma line, IGROV1, in tissue culture and in nude miceCancer Res.Year: 198545497049793861241
41.. Cell Line NCI/ADR-RES is an ovarian tumor cell line, not a breast line Available online:
42.. Batist G.,Tulpule A.,Sinha B.K.,Katki A.G.,Myers C.E.,Cowan K.H.. Overexpression of a novel anionic glutathione transferase in multidrug-resistant human breast cancer cellsJ. Biol. Chem.Year: 198626115544155493782078
43.. Roschke A.V.,Tonon G.,Gehlhaus K.S.,McTyre N.,Bussey K.J.,Lababidi S.,Scudiero D.A.,Weinstein J.N.,Kirsch I.R.. Karyotypic complexity of the NCI-60 drug-screening panelCancer Res.Year: 2003638634864714695175
44.. Hamilton T.C.,Young R.C.,McKoy W.M.,Grotzinger K.R.,Green J.A.,Chu E.W.,Whang-Peng J.,Rogan A.M.,Green W.R.,Ozols R.F.. Characterization of a human ovarian carcinoma cell line (NIH:OVCAR-3) with androgen and estrogen receptorsCancer Res.Year: 198343537953896604576
45.. Hamilton T.C.,Young R.C.,Ozols R.F.. Experimental model systems of ovarian cancer: applications to the design and evaluation of new treatment approachesSemin. Oncol.Year: 1984112852986385258
46.. Schilder R.J.,Hall L.,Monks A.,Handel L.M.,Fornace A.J. Jr.,Ozols R.F.,Fojo A.T.,Hamilton T.C.. Metallothionein gene expression and resistance to cisplatin in human ovarian cancerInt. J. CancerYear: 1990454164222307530
47.. Stone K.R.,Mickey D.D.,Wunderli H.,Mickey G.H.,Paulson D.F.. Isolation of a human prostate carcinoma cell line (DU 145).Int. J. CancerYear: 197821274281631930
48.. Kaighn M.E.,Narayan K.S.,Ohnuki Y.,Lechner J.F.,Jones L.W.. Establishment and characterization of a human prostatic carcinoma cell line (PC-3).Invest. Urol.Year: 1979171623447482
49.. Borden E.C.,Hogan T.F.,Voelkel J.G.. Comparative antiproliferative activity in vitro of natural interferons alpha and beta for diploid and transformed human cellsCancer Res.Year: 198242494849537139598
50.. Berger D.P.,Winterhalter B.R.,Fiebig H.H.. Establishment and characterization of human tumor xenografts in thymus-aplastic nude miceImmunodeficient Mice in OncologyFiebig H.H.,Berger D.P.KargerBasel, SwitzerlandYear: 1992422346
51.. Naito S.,von Eschenbach A.C.,Giavazzi R.,Fidler I.J.. Growth and metastasis of tumor cells isolated from a human renal cell carcinoma implanted into different organs of nude miceCancer Res.Year: 198646410941153731078
52.. Bear A.,Clayman R.V.,Elbers J.,Limas C.,Wang N.,Stone K.,Gebhard R.,Prigge W.,Palmer J.. Characterization of two human cell lines (TK-10, TK-164) of renal cell cancerCancer Res.Year: 198747385638623594443
53.. Williams R.D.,Elliott A.Y.,Stein N.,Fraley E.E.. In vitro cultivation of human renal cell cancer. I. Establishment of cells in cultureIn VitroYear: 197612623627101052810.1007/BF02797460
54.. Lasfargues E.Y.,Coutinho W.G.,Redfield E.S.. Isolation of two human tumor epithelial cell lines from solid breast carcinomasJ. Natl. Cancer Inst.Year: 197861967978212572
55.. Urisman A.,Molinaro R.J.,Fischer N.,Plummer S.J.,Casey G.,Klein E.A.,Malathi K.,Magi-Galluzzi C.,Tubbs R.R.,Ganem D.,et al. Identification of a novel Gammaretrovirus in prostate tumors of patients homozygous for R462Q RNASEL variantPLoS Pathog.Year: 20062e251660973010.1371/journal.ppat.0020025
56.. Paprotka T.,Delviks-Frankenberry K.A.,Cingoz O.,Martinez A.,Kung H.J.,Tepper C.G.,Hu W.S.,Fivash M.J. Jr.,Coffin J.M.,Pathak V.K.. Recombinant origin of the retrovirus XMRVScienceYear: 20113339710121628392
57.. van der Kuyl A.C.,Berkhout B.. XMRV: not a mousy virusJ. Formos. Med. Assoc.Year: 201111027327421621147
58.. Knouf E.C.,Metzger M.J.,Mitchell P.S.,Arroyo J.D.,Chevillet J.R.,Tewari M.,Miller A.D.. Multiple integrated copies and high-level production of the human retrovirus XMRV (xenotropic murine leukemia virus-related virus) from 22Rv1 prostate carcinoma cellsJ. Virol.Year: 2009837353735619403664
59.. Dong B.,Kim S.,Hong S.,Das Gupta J.,Malathi K.,Klein E.A.,Ganem D.,Derisi J.L.,Chow S.A.,Silverman R.H.. An infectious retrovirus susceptible to an IFN antiviral pathway from human prostate tumorsProc. Natl. Acad. Sci. U.S.A.Year: 20071041655166017234809
60.. Hue S.,Gray E.R.,Gall A.,Katzourakis A.,Tan C.P.,Houldcroft C.J.,McLaren S.,Pillay D.,Futreal A.,Garson J.A.,et al. Disease-associated XMRV sequences are consistent with laboratory contaminationRetrovirologyYear: 201071112117197910.1186/1742-4690-7-111
61.. Wolff L.,Koller R.,Ruscetti S.. Monoclonal antibody to spleen focus-forming virus-encoded gp52 provides a probe for the amino-terminal region of retroviral envelope proteins that confers dual tropism and xenotropismJ. Virol.Year: 1982434724816180179
62.. Ono K.,Satoh M.,Yoshida T.,Ozawa Y.,Kohara A.,Takeuchi M.,Mizusawa H.,Sawada H.. Species identification of animal cells by nested PCR targeted to mitochondrial DNAIn Vitro Cell. Dev. Biol.Year: 200743168175
63.. Oakes B.,Tai A.K.,Cingoz O.,Henefield M.H.,Levine S.,Coffin J.M.,Huber B.T.. Contamination of human DNA samples with mouse DNA can lead to false detection of XMRV-like sequencesRetrovirologyYear: 2010710921171973
64.. Barrett T.,Troup D.B.,Wilhite S.E.,Ledoux P.,Evangelista C.,Kim I.F.,Tomashevsky M.,Marshall K.A.,Phillippy K.H.,Sherman P.M.,et al. NCBI GEO: archive for functional genomics data sets--10 years onNucleic Acids Res.Year: 201139D1005D101021097893
65.. Kozak C.A.. The mouse "xenotropic" gammaretroviruses and their XPR1 receptorRetrovirologyYear: 2010710121118532
66.. Fischer N.,Schulz C.,Stieler K.,Hohn O.,Lange C.,Drosten C.,Aepfelbacher M.. Xenotropic murine leukemia virus-related gammaretrovirus in respiratory tractEmerg. Infect. Dis.Year: 2010161000100220507757
67.. Coffin J.M.. Retroviridae: The viruses and their replicationFundamental Virology3rdFields B.N.,Knipe D.M.,Howley P.M.Lippincott-Raven PublishersPhiladelphia, PA, USAYear: 1996763843
68.. Jühling F.,Mörl M.,Hartmann R.K.,Sprinzl M.,Stadler P.F.,Pütz J.. tRNAdb 2009: compilation of tRNA sequences and tRNA genesNucleic Acids Res.Year: 200937D159D16218957446
69.. Jern P.,Stoye J.P.,Coffin J.M.. Role of APOBEC3 in genetic diversity among endogenous murine leukemia virusesPLoS Genet.Year: 200732014202217967065
70.. Nikbakht K.N.,Ou C.Y.,Boone L.R.,Glover P.L.,Yang W.K.. Nucleotide sequence analysis of endogenous murine leukemia virus-related proviral clones reveals primer-binding sites for glutamine tRNAJ. Virol.Year: 1985548898932987543
71.. Ou C.Y.,Boone L.R.,Yang W.K.. A novel sequence segment and other nucleotide structural features in the long terminal repeat of a BALB/c mouse genomic leukemia virus-related DNA cloneNucleic Acids Res.Year: 198311560356206310506
72.. Swanstrom R.,Wills J.W.. Synthesis, Assembly, and Processing of Viral ProteinsRetrovirusesCoffin J.M.; Hughes,S.H.; Varmus H.E.Cold Spring Harbor Laboratory PressCold Spring Harbor, NY, USAYear: 1997263341
73.. Frankel W.N.,Stoye J.P.,Taylor B.A.,Coffin J.M.. Genetic analysis of endogenous xenotropic murine leukemia viruses: association with two common mouse mutations and the viral restriction locus Fv-1J. Virol.Year: 198963176317742564439
74.. Hoggan M.D.,Buckler C.E.,Sears J.F.,Rowe W.P.,Martin M.A.. Organization and stability of endogenous xenotropic murine leukemia virus proviral DNA in mouse genomesJ. Virol.Year: 1983454734776296455
75.. Kozak C.A.,O'Neill R.R.. Diverse wild mouse origins of xenotropic, mink cell focus-forming, and two types of ecotropic proviral genesJ. Virol.Year: 198761308230883041030
76.. O'Neill R.R.,Khan A.S.,Hoggan M.D.,Hartley J.W.,Martin M.A.,Repaske R.. Specific hybridization probes demonstrate fewer xenotropic than mink cell focus-forming murine leukemia virus env-related sequences in DNAs from inbred laboratory miceJ. Virol.Year: 1986583593663009853
77.. Tomonaga K.,Coffin J.M.. Structure and distribution of endogenous nonecotropic murine leukemia viruses in wild miceJ. Virol.Year: 199872828983009733873
78.. Aaronson S.A.,Todaro G.J.,Scolnick E.M.. Induction of murine C-type viruses from clonal lines of virus-free BALB-3T3 cellsScienceYear: 19711741571595119627
79.. Haran-Ghera N.. Leukemogenic activity of centrifugates from irradiated mouse thymus and bone marrowInt. J. CancerYear: 1966181875902319
80.. Hirsch M.S.,Black P.H.,Tracy G.S.,Leibowitz S.,Schwartz R.S.. Leukemia virus activation in chronic allogeneic diseaseProc. Natl. Acad. Sci. U.S.A.Year: 197067191419174395204
81.. Igel H.J.,Huebner R.J.,Turner H.C.,Kotin P.,Falk H.L.. Mouse leukemia virus activation by chemical carcinogensScienceYear: 1969166162416264311011
82.. Lieberman M.,Kaplan H.S.. Leukemogenic activity of filtrates from radiation-induced lymphoid tumors of miceScienceYear: 195913038738813675761
83.. Achong B.G.,Trumper P.A.,Giovanella B.C.. C-type virus particles in human tumours transplanted into nude miceBr. J. CancerYear: 197634203206183801
84.. Gautsch J.W.,Knowles A.F.,Jensen F.C.,Kaplan N.O.. Highly efficient induction of type C retroviruses by a human tumor in athymic miceProc. Natl. Acad. Sci. U.S.A.Year: 198077224722506246530
85.. Lusso P.,di Marzo Veronese F.,Ensoli B.,Franchini G.,Jemma C.,DeRocco S.E.,Kalyanaraman V.S.,Gallo R.C.. Expanded HIV-1 cellular tropism by phenotypic mixing with murine endogenous retrovirusesScienceYear: 19902478488522305256
86.. Suzuki T.,Yanagihara K.,Yoshida K.,Seido T.,Kuga N.. Infectious murine type-C viruses released from human cancer cells transplated into nude miceGannYear: 19776899106193756
87.. Todaro G.J.,Arnstein P.,Parks W.P.,Lennette E.H.,Huebner R.J.. A type-C virus in human rhabdomyosarcoma cells after inoculation into NIH Swiss mice treated with antithymocyte serumProc. Natl. Acad. Sci. U.S.A.Year: 1973708598624123693
88.. Tralka T.S.,Yee C.L.,Rabson A.B.,Wivel N.A.,Stromberg K.J.,Rabson A.S.,Costa J.C.. Murine type C retroviruses and intracisternal A-particles in human tumors serially passaged in nude miceJ. Natl. Cancer Inst.Year: 1983715915996310201
89.. Zhang Y.A.,Maitra A.,Hsieh J.T.,Rudin C.M.,Peacock C.,Karikari C.,Brekken R.A.,Stastny V.,Gao B.,Girard L.,et al. Frequent detection of infectious xenotropic murine leukemia virus (XMLV) in human cultures established from mouse xenograftsCancer Biol. Ther.Year: 201112
90.. Antoine M.,Wegmann B.,Kiefer P.. Envelope and long terminal repeat sequences of an infectious murine leukemia virus from a human SCLC cell line: implications for gene transferVirus GenesYear: 1998171571689857989
91.. Raisch K.P.,Pizzato M.,Sun H.Y.,Takeuchi Y.,Cashdollar L.W.,Grossberg S.E.. Molecular cloning, complete sequence, and biological characterization of a xenotropic murine leukemia virus constitutively released from the human B-lymphoblastoid cell line DG-75VirologyYear: 200330883911270609210.1016/S0042-6822(02)00074-0
92.. Sfanos K.S.,Aloia A.L.,Hicks J.L.,Esopi D.M.,Steranka J.P.,Shao W.,Sanchez-Martinez S.,Yegnasubramanian S.,Burns K.H.,Rein A.,et al. Identification of replication competent murine gammaretroviruses in commonly used prostate cancer cell linesPLoS OneYear: 20116e2087421698104
93.. Jelacic T.M.,Thompson D.,Hanson C.,Cmarik J.L.,Nishigaki K.,Ruscetti S.. The tyrosine kinase sf-Stk and its downstream signals are required for maintenance of friend spleen focus-forming virus-induced fibroblast transformationJ. Virol.Year: 20088241942717959667
94.. Lombardi V.C.,Ruscetti F.W.,Das Gupta J.,Pfost M.A.,Hagen K.S.,Peterson D.L.,Ruscetti S.K.,Bagni R.K.,Petrow-Sadowski C.,Gold B.,et al. Detection of an infectious retrovirus, XMRV, in blood cells of patients with chronic fatigue syndromeScienceYear: 200932658558919815723
95.. Drummond A.J.,Ashton B.,Buxton S.,Cheung M.,Cooper A.,Heled J.,Kearse M.,Moir R.,Stones-Havas S.,Sturrock S.,et al. Geneious v5.1Year: 2010 Available online:
96.. Goujon M.,McWilliam H.,Li W.,Valentin F.,Squizzato S.,Paern J.,Lopez R.. A new bioinformatics analysis tools framework at EMBL-EBINucleic Acids Res.Year: 201038W695W69920439314
97.. Larkin M.A.,Blackshields G.,Brown N.P.,Chenna R.,McGettigan P.A.,McWilliam H.,Valentin F.,Wallace I.M.,Wilm A.,Lopez R.,et al. Clustal W and Clustal X version 2.0BioinformaticsYear: 2007232947294817846036


[Figure ID: viruses-03-02442-f001]
Figure 1 

Detection of viral protein and DNA in the human lung adenocarcinoma cell line EKVX. Immunoblotting and PCR were carried out on all 60 cell lines of the panel; a subset are shown. Immunoblotting of total protein lysates from lung cancer cell lines for Env with monoclonal antibody 7C10 (A). XMRV-infected LNCaP cell lysate [LNCaP/XMRV(+)] is included as a positive control. Env is present as both a precursor form (upper band) and a processed surface unit (lower band). Immunoblotting with β-actin antibody was used to confirm equal loading. Single-round PCR of genomic DNA for env(B) and gag(C) sequences. Template is genomic DNA from cell lines of the NCI-60 panel. Arrowheads indicate the expected fragment sizes: 533 bp for env and 731 bp for gag. Negative (no template) controls were run on separate gels and no products of the expected size were observed (data not shown). (D) EKVX and other representative cell lines, DU145 and HCT-116, were tested for mouse contamination by PCR for IAP using 600 ng genomic DNA as template. The positive control is genomic DNA from a mouse cell line diluted 1/105 in human cell line genomic DNA.

[Figure ID: viruses-03-02442-f002]
Figure 2 

Transmission of infection by a cell-free EKVX supernatant. Subconfluent LNCaP cells were infected with filtered supernatant from EKVX cells (EKVX) or with cell culture medium as a negative control (Mock) in the presence of polybrene. Total protein lysates were prepared at 10 and 16 days post-infection (dpi). Lysates were subjected to electrophoresis and immunoblotting with monoclonal antibody 7C10 for Env and with goat anti-RLV p30 capsid. Immunoblotting with β-actin antibody was used to confirm equal loading.

[Figure ID: viruses-03-02442-f003]
Figure 3 

Nucleotide sequence from the LTR, gag, and env regions of the EKVX virus. The sequences of regions of the EKVX virus are aligned with XMRV (VP62; accession no. DQ399707) and an endogenous X-MLV provirus from chromosome 13 (Chr13 X-MLV) of a C57BL/6 mouse (accession no. CT030655, nt 54,685-63,371). U3 sequence from the 3′ end of XMRV VP62 sequence was appended to the 5′ end in the figure to generate the predicted provirus sequence. Numbering for XMRV is according to XMRV VP62, with nt 1 (at the U3/R transition) highlighted in gray. Numbering for EKVX indicates the nucleotide number for each fragment shown. Conserved nucleotides are indicated by *. (A) LTR-gag leader region, compiled from PCR fragments generated with primers DG-75 7762F/DG-75 287R and DG-75 7945F/DG-75 664R. The primer binding site is underlined and shown in blue. The upstream glyco-Gag start is highlighted in green, and the in-frame stop codon in XMRV is shown in red. The start codon for the Gag polyprotein is highlighted in yellow. (B)env region, generated with primers VP62 5922F / VP62 6454R. (C)env-LTR region, generated with primers DG-75 7607F/DG-75 7968R. The stop codon for the Env polyprotein is shown in red.

[TableWrap ID: viruses-03-02442-t001] pii: viruses-03-02442-t001_Table 1.
Table 1 

Derivation of the cell lines of the NCI-60 panel and results of virus screening.

Cell line name Tumor type Immuno-blotting for Env PCR for enva PCR for gaga Passaged through miceb Reference
BT-549 Breast - - - Nc
Hs-578T Breast - - - N [3]
MCF-7 Breast - - - N [4]
MDA-MB-231 Breast - - - N [5]
T-47D Breast - - - N [6]
MDA-MB-468 Breast - - - N [7]
SF-268 CNS - - - N [8]
SF-295 CNS - - - N [8]
SF-539 CNS - - - N [9]
SNB-19d CNS - - - N [10,11,12]
SNB-75 CNS - - - N [10,11]
U251d CNS - - - N [12,13]
COLO-205 Colon - - - N [14]
HCC-2998 Colon - - - Ye
HCT-116 Colon - - - N [15]
HCT-15 Colon - - - N [16]
HT29 Colon - - - N [17]
KM12f Colon - - - N [18]
SW-620 Colon - - - N [19]
CCRF-CEM Leukemia - - - N [20]
HL-60 Leukemia - - - N [21]
K562 Leukemia - - - N [22]
MOLT-4 Leukemia - - - N [23]
RPMI-8226 Leukemia - - - N [24]
SR Leukemia - - - N [25]
LOX IMVI Melanoma - - - Y [26,27]
M14g Melanoma - - - N [28,29]
MALME-3M Melanoma - - - N [17]
MDA-MB-435g Melanoma - - - N [7,29,30,31]
SK-MEL-2 Melanoma - - - N [17]
SK-MEL-28 Melanoma - - - N [32]
SK-MEL-5 Melanoma - - - N [32]
UACC-257 Melanoma - - - Ne
UACC-62 Melanoma - - - Ne
A549 ATCC Non-Small Cell Lung - - - N [33]
EKVX Non-Small Cell Lung + + + Y [26]
HOP-62 Non-Small Cell Lung - - - Ye [34,35]
HOP-92 Non-Small Cell Lung - - - Ne [34,35]
NCI-H226 Non-Small Cell Lung - - - N [36,37]
NCI-H23 Non-Small Cell Lung - - - N [36,37]
NCI-H322M Non-Small Cell Lung - - - N [37,38,39]
NCI-H460 Non-Small Cell Lung - - - N [36,37]
NCI-H522 Non-Small Cell Lung - - - N [36,37]
IGR-OV1 Ovarian - - - N [40]
NCI/ADR-RESh Ovarian - - - N [41,42,43]
OVCAR-3 Ovarian - - - N [44]
OVCAR-4 Ovarian - - - N [45]
OVCAR-5 Ovarian - - - N [45]
OVCAR-8 Ovarian - - - N [45,46]
SK-0V-3 Ovarian - - - N [17]
DU145 Prostate - - - N [47]
PC-3 Prostate - - - N [48]
A498 Renal - - - N [33]
ACHN Renal - - - N [49]
CAKI-1 Renal - - - N [17]
RXF-393 Renal - - - Y [50]
SN12C Renal - - - N [51]
TK-10 Renal - - - N [52]
UO-31 Renal - - - Ui
786-0 Renal - - - N [53]

a “+”indicates a definitive band of the expected size was observed.

b Y=Yes. N=No. U=Unknown; no information was available from literature references.

c This cell line was obtained from ATCC. According to the ATCC description: “The BT-549 line was isolated in 1978 by W.G. Coutinho and E. Y. Lasfargues. Source tissue consisted of a papillary, invasive ductal tumor which had metastasized to 3 of 7 regional lymph nodes.” The establishment of other breast cancer cell lines by the same group has been described [54].

d SNB-19 and U251 are derived from the same individual [12].

e Michael Alley, NCI, personal communication.

f The KM12 cell line is the same as KM12C in Morikawa et al. [18] (Michael Alley, NCI, personal communication).

g Current samples of M14 and MDA-MB-435 are related [29]. MDA-MB-435 was originally isolated as a breast cancer cell line.

h NCI/ADR-RES was originally described as a breast cancer cell line, but is related to the ovarian cancer cell line OVCAR-8 [41].

i Highly unlikely to have been passaged through mice (W. Marston Linehan, NCI, personal communication).

Article Categories:
  • Communication

Keywords: EKVX, NCI-60, human cell line, xenotropic murine leukemia virus, gammaretrovirus .

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