Among the genes with differential expression
(more than 2 fold), we selected 15 genes (Table 3) associated with angiogenesis. We found that VEGF-A, which is a known target gene of HIF-1α, was significantly increased by more than 6 fold after transduction by Ad5-HIF-1α and reduced by approximately 4 fold after transduction by Ad5-siHIF-1α. HIF-1α also increased the expression of several inflammatory factors, such as interleukin 6 (IL6), tumor necrosis factor alpha-induced Selleckchem LY294002 protein 6 (TNFAIP6), and interleukin 1 receptor type I (IL1RI). These results indicated that angiogenesis in SCLC induced by HIF-1α may be related to inflammatory responses because the expression levels of several corresponding inflammatory factors were upregulated. Matrix metalloproteinase-28 (MMP-28) and matrix metalloproteinase-14 (MMP-14) are important members of the MMP family, and matrix degradation is the precondition of angiogenesis in tumors. The buy CUDC-907 upregulation of MMP-28 and MMP-14 indicated that HIF-1α may promote matrix degradation to induce angiogenesis in SCLC. HIF-1α also induced other angiogenic factors, such as tenascin C (TNC), platelet derived growth factor C (PDGFC),
fibronectin 1 (FN1), myocardin (MYOCD), and heme oxygenase decycling 1 (HMOX1). In contrast, HIF-1α decreased the expression levels of the following genes: suppressor of cytokine signaling 2 (SOCS2), insulin-like find more growth factor binding protein 3 (IGFBP3), insulin-like growth factor 1 receptor (IGF1R), and cysteine-rich angiogenic inducer 61 (CYR61). The most significant downregulation of gene expression was found in the SOCS2 gene. Besides these, two glycolytic genes glucose transporter 1(GLUT1) and glucose transporter 2 (GLUT2) were upregulated by HIF-1α to 2.98 and 3.74 respectively, so we concluded that HIF-1α maybe upregulate
the glycolysis reaction of SCLC. Table 3 The effect of HIF-1α on angiogenic gene expression UniGeneID Gene name Gene Symbol Fold change (ratio ≥ 2, p < 0.05) A B Hs.143250 Tenascin C (hexabrachion) TNC 5.28 -3.23 Hs.654458 Interleukin 6 (interferon, beta 2) IL6 5.29 -2.27 Hs.73793 Vascular endothelial growth factorA VEGF-A 6.76 -3.98 Hs.437322 Tumor necrosis factor, alpha-induced protein 6 TNFAIP6 6.96 -4.75 Hs.570855 Platelet derived growth Nintedanib (BIBF 1120) factor C PDGFC 2.26 -3.21 Hs.701982 Interleukin 1 receptor, type I IL1R1 2.64 -2.21 Hs.203717 Fibronectin 1 FN1 2.31 -2.57 Hs.567641 Myocardin MYOCD 3.03 -2.08 Hs.517581 Heme oxygenase (decycling) 1 HMOX1 2.64 -2.73 Hs.687274 Matrix metallopeptidase 28 MMP28 4.39 -3.67 Hs.2399 Matrix metallopeptidase 14 MMP14 2.97 -2.24 Hs.473721 Glucose transporter 1 GLUT1 2.98 -2.16 Hs.167584 Glucose transporter 2 GLUT2 3.74 -2.05 Hs.485572 Suppressor of cytokine signaling 2 SOCS2 -6.06 3.06 Hs.450230 Insulin-like growth factor binding protein 3 IGFBP3 -4.02 2.17 Hs.