| Differential expression of thromboxane synthase in prostate carcinoma: role in tumor cell motility. | |
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MedLine Citation:
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PMID: 14742249 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Arachidonic acid metabolism through cyclooxygenase, lipoxygenase, or P-450 epoxygenase pathways can generate a variety of eicosanoids. Thromboxane synthase (TxS) metabolizes the cyclooxygenase product, prostanglandin H(2), into thromboxane A(2) (TXA(2)), which can cause vessel constriction, platelet activation, and aggregation. Here we demonstrate that human prostate cancer (PCa) cells express enzymatically active TxS and that this enzyme is involved in cell motility. In human PCa cell lines, PC-3, PC-3M, and ML-2 cells expressed higher levels of TxS than normal prostate epithelial cells or other established PCa cell lines such as DU145, LNCaP, or PPC-1. We cloned and sequenced the full-length TxS cDNA from PC-3 cells and found two changes in the amino acid residues. Immunohistochemical analysis of tumor specimens revealed that expression of TxS is weak or absent in normal differentiated luminal, or secretory cells, significantly elevated in less differentiated or advanced prostate tumors, and markedly increased in tumors with perineural invasion. TxS expressed in PC-3 cells was enzymatically active and susceptible to carboxyheptal imidazole, an inhibitor of TxS. The biosynthesis of TXA(2) in PC-3 cells was dependent on COX-2, and to a lesser extent, COX-1. Treatment of PC-3 cells with a COX-1 selective inhibitor, piroxicam, reduced TXA(2) synthesis by approximately 40%, while the COX-2 specific inhibitor NS398 reduced TXA(2) production by approximately 80%. Inhibition of TxS activity or blockade of TXA(2) function reduced PC-3 cell migration on fibronectin, while having minimal effects on cell cycle progression or survival. Finally, increased expression of TxS in DU145 cells increased cell motility. Our data suggest that human PCa cells express TxS and that this enzyme may contribute to PCa progression through modulating cell motility. |
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Authors:
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Daotai Nie; Mingxin Che; Alex Zacharek; Yan Qiao; Li Li; Xinglin Li; Mario Lamberti; Keqin Tang; Yilong Cai; Yande Guo; David Grignon; Kenneth V Honn |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of pathology Volume: 164 ISSN: 0002-9440 ISO Abbreviation: Am. J. Pathol. Publication Date: 2004 Feb |
Date Detail:
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Created Date: 2004-01-26 Completed Date: 2004-03-11 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 0370502 Medline TA: Am J Pathol Country: United States |
Other Details:
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Languages: eng Pagination: 429-39 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiation Oncology, Wayne State University School of Medicine and Karmanos Cancer Institute, Detroit, Michigan 48202, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence Base Sequence Blotting, Northern Cell Line, Tumor Cell Movement / drug effects, physiology* Cyclooxygenase 1 Cyclooxygenase 2 DNA, Complementary / analysis Enzyme Inhibitors / pharmacology Humans Immunohistochemistry Isoenzymes / metabolism Male Membrane Proteins Molecular Sequence Data Neoplasm Invasiveness Prostaglandin-Endoperoxide Synthases / metabolism Prostatic Neoplasms / enzymology* Reverse Transcriptase Polymerase Chain Reaction Thromboxane-A Synthase / biosynthesis*, drug effects, genetics |
| Grant Support | |
ID/Acronym/Agency:
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CA-29997/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/DNA, Complementary; 0/Enzyme Inhibitors; 0/Isoenzymes; 0/Membrane Proteins; EC 1.14.99.1/Cyclooxygenase 1; EC 1.14.99.1/Cyclooxygenase 2; EC 1.14.99.1/PTGS1 protein, human; EC 1.14.99.1/PTGS2 protein, human; EC 1.14.99.1/Prostaglandin-Endoperoxide Synthases; EC 5.3.99.5/Thromboxane-A Synthase |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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