MMP-2 alters VEGF expression via alphaVbeta3 integrin-mediated PI3K/AKT signaling in A549 lung cancer cells.
MMP-2 alters VEGF expression via alphaVbeta3 integrin-mediated PI3K/AKT signaling in A549 lung cancer cells.
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DOI:
10.1002/ijc.25134
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发表时间:
2010-09-01
影响因子:
6.4
通讯作者:
Rao, Jasti S.
中科院分区:
文献类型:
--
作者:
Chetty, Chandramu;Lakka, Sajani S.;Bhoopathi, Praveen;Rao, Jasti S.
Vascular endothelial growth factor (VEGF) is one of the most important angiogenic growth factors for tumor angiogenesis. Here, we sought to explore whether RNA interference (RNAi) targeting Matrix metalloproteinase-2 (MMP-2) could disrupt VEGF mediated angiogenesis in lung cancer. MMP-2 siRNA inhibited lung cancer cell-induced tube formation of endothelial cells in vitro; addition of recombinant human-MMP-2 restored angiogenesis. MMP-2 transcriptional suppression decreased VEGF, PI3K protein levels, and AKT phosphorylation in lung cancer cells. In addition, MMP-2 suppression decreased Hypoxia inducible factor-1α (HIF-1α), a transcription factor for VEGF, as determined by Electrophoretic mobility shift assay (EMSA). We also show that MMP-2 suppression disrupted phosphatidylinositol 3-kinase (PI3K) dependent VEGF expression; ectopic expression of myr-AKT restored VEGF inhibition. Further, MMP-2 suppression decreased the interaction of integrin-αVβ3 and MMP-2 as confirmed by immunoprecipitation analyses. Studies with either function blocking integrin-αVβ3 antibody or MMP-2 specific inhibitor (ARP-100) indicate that suppression of MMP-2 decreased integrin-αVβ3-mediated induction of PI3K/AKT leading to decreased VEGF expression. Moreover, A549 xenograft tissue sections from mice that treated with MMP-2 siRNA showed reduced expression of VEGF, and the angiogenic marker, Factor-VIII. The inhibition of tumor angiogenesis in MMP-2 suppressed tumor sections was associated with decreased co-localization of integrin-αVβ3 and MMP-2. In summary, these data provide new insights into the mechanisms underlying MMP-2-mediated VEGF expression in lung tumor angiogenesis.
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影响因子:
3.4
作者:
Enatsu, Sotarou;Iwasaki, Akinori;Kuroki, Masahide
通讯作者:
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影响因子:
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FISHER, C;GILBERTSONBEADLING, S;MITCHELL, MA
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DOI:
10.1073/pnas.97.8.3884
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影响因子:
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作者:
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