Hypoxic tumor cell modulates its microenvironment to enhance angiogenic and metastatic potential by secretion of proteins and exosomes

Jung Eun Park, Hon Sen Tan, Arnab Datta, Ruenn Chai Lai, Huoming Zhang, Wei Meng, Sai Kiang Lim, Siu Kwan Sze

    Research output: Contribution to journalArticlepeer-review

    368 Scopus citations

    Abstract

    Under hypoxia, tumor cells produce a secretion that modulates their microenvironment to facilitate tumor angiogenesis and metastasis. Here, we observed that hypoxic or reoxygenated A431 carcinoma cells exhibited enhanced angiogenic and metastatic potential such as reduced cell-cell and cell-extracellular matrix adhesion, increased invasiveness, and production of a secretion with increased chorioallantoic membrane angiogenic activity. Consistent with these observations, quantitative proteomics revealed that under hypoxia the tumor cells secreted proteins involved in angiogenesis, focal adhesion, extracellular matrix-receptor interaction, and immune cell recruitment. Unexpectedly, the secreted proteins were predominantly cytoplasmic and membrane proteins. Ultracentrifugation at 100,000 x g precipitated 54% of the secreted proteins and enriched for many exosome-associated proteins such as the tetraspanins and Alix and also proteins with the potential to facilitate angiogenesis and metastasis. Two tetraspanins, CD9 and CD81, co-immunoprecipitated. Together, these data suggested that tumor cells secrete proteins and exosomes with the potential to modulate their microenvironment and facilitate angiogenesis and metastasis.

    Original languageEnglish (US)
    Pages (from-to)1085-1099
    Number of pages15
    JournalMolecular and Cellular Proteomics
    Volume9
    Issue number6
    DOIs
    StatePublished - Jun 1 2010

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Biochemistry
    • Molecular Biology

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