| Survivin is released from cancer cells via exosomes. | |
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MedLine Citation:
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PMID: 20717727 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Inhibitor of apoptosis (IAP) and Heat shock proteins (HSPs) provide assistance in protecting cells from stresses of hypoxia, imbalanced pH, and altered metabolic and redox states commonly found in the microenvironmental mixture of tumor and nontumor cells. HSPs are upregulated, cell-surface displayed and released extracellularly in some types of tumors, a finding that until now was not shared by members of the IAP family. The IAP Survivin has been implicated in apoptosis inhibition and the regulation of mitosis in cancer cells. Survivin exists in a number of subcellular locations such as the mitochondria, cytoplasm, nucleus, and most recently, the extracellular space. Our previous work showing that extracellular survivin was able to enhance cellular proliferation, survival and tumor cell invasion provides evidence that Survivin might be secreted via an unidentified exocytotic pathway. In the present study, we describe for the first time the exosome-release of Survivin to the extracellular space both basally and after proton irradiation-induced stress. To examine whether exosomes contributed to Survivin release from cancer cells, exosomes were purified from HeLa cervical carcinoma cells and exosome quantity and Survivin content were determined. We demonstrate that although proton irradiation does not influence the exosomal secretory rate, the Survivin content of exosomes isolated from HeLa cells treated with a sublethal dose of proton irradiation (3 Gy) is significantly higher than control. These data identify a novel secretory pathway by which Survivin can be actively released from cells in both the basal and stress-induced state. |
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Authors:
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Salma Khan; Jessica M S Jutzy; Jonathan R Aspe; Dalmor W McGregor; Jonathan W Neidigh; Nathan R Wall |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Apoptosis : an international journal on programmed cell death Volume: 16 ISSN: 1573-675X ISO Abbreviation: Apoptosis Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-24 Completed Date: 2011-07-05 Revised Date: 2012-04-26 |
Medline Journal Info:
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Nlm Unique ID: 9712129 Medline TA: Apoptosis Country: United States |
Other Details:
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Languages: eng Pagination: 1-12 Citation Subset: IM |
Affiliation:
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Center for Health Disparities Research and Molecular Medicine, Loma Linda University, 11085 Campus Street, Loma Linda, CA 92350, USA. salmakhan@llu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Apoptosis
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drug effects,
genetics Blotting, Western Cell Proliferation Cysteine Proteinase Inhibitors / genetics, metabolism* Cytoskeleton / metabolism Exocytosis / radiation effects Exosomes / genetics, metabolism* Extracellular Space / metabolism Female Gene Expression / radiation effects HeLa Cells Humans Inhibitor of Apoptosis Proteins / genetics, metabolism* Protons Radioisotopes Secretory Pathway / radiation effects Up-Regulation Uterine Cervical Neoplasms / genetics, metabolism*, therapy |
| Grant Support | |
ID/Acronym/Agency:
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5P20MD001632/MD/NIMHD NIH HHS; P20 MD001632-01/MD/NIMHD NIH HHS; P20 MD001632-02/MD/NIMHD NIH HHS; P20 MD001632-03/MD/NIMHD NIH HHS; P20 MD001632-04/MD/NIMHD NIH HHS; P20 MD001632-05/MD/NIMHD NIH HHS; R25 GM060507-01A1/GM/NIGMS NIH HHS; R25 GM060507-02/GM/NIGMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/BIRC5 protein, human; 0/Cysteine Proteinase Inhibitors; 0/Inhibitor of Apoptosis Proteins; 0/Protons; 0/Radioisotopes |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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