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Intracrine Vascular Endothelial Growth Factor Signaling in Survival and Chemoresistance of Human Colorectal Cancer Cells

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Intracrine Vascular Endothelial Growth Factor Signaling in Survival and Chemoresistance of Human Colorectal Cancer Cells Oncogene (2011) 30, 1205–1212 & 2011 Macmillan Publishers Limited All rights reserved 0950-9232/11 www.nature.com/onc ORIGINAL ARTICLE Intracrine vascular endothelial growth factor signaling in survival and chemoresistance of human colorectal cancer cells S Samuel1, F Fan1,LHDang2, L Xia1, P Gaur3 and LM Ellis1,3 1Department of Cancer Biology, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA; 2Division of Hematology/Oncology, Department of Medicine, University of Florida, Gainesville, FL, USA and 3Department of Surgical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA Although the effects of vascular endothelial growth factor proliferation of endothelial cells (reviewed in Brown (VEGF) on angiogenesis and vascular function are well et al., 1997). It has since been shown that VEGF can known, the effects of VEGF on tumor cell function also mediate a protective/survival effect on a number remain to be elucidated. We studied phenotypic changes in of cell types, including endothelial cells, embryonic human colorectal cancer (CRC) cells with homozygous stem cells and hematopoietic stem cells (Ferrara et al., deletion of VEGF alleles to determine the potential direct 1996; Gerber et al., 1998, 2002). In addition, recent role of VEGF on tumor cell function. Loss of VEGF studies have shown that VEGF acts as an autocrine/ expression led to significantly decreased cell growth and paracrine growth and survival factor for tumor cells that increased spontaneous apoptosis in CRC cells (Po0.01). express VEGF receptor (Bachelder et al., 2001; Pidgeon Loss of VEGF also increased the in vitro sensitivity of et al., 2001; Dias et al., 2002; Santos and Dias, 2004; cells to the cytotoxic effects of the chemotherapeutic drug Vincent et al., 2005; Barr et al., 2008; Calvani et al., 5-fluorouracil, as shown by increased apoptosis (Po0.05). 2008). These effects were mediated via upregulation of the pro- Our laboratory previously showed that expression of apoptotic mediators caspase-3, cleaved PARP and Bax the VEGFR-1 receptor by colorectal cancer (CRC) cells and downregulation of the pro-survival mediator survivin. mediates cell motility and invasion (Fan et al., 2005). Our findings suggest a novel and distinct function of The presence of VEGF receptors on CRC cells led us to VEGF in mediating autocrine/intracrine CRC cell survival. hypothesize that VEGF has a direct effect on tumor cell Oncogene (2011) 30, 1205–1212; doi:10.1038/onc.2010.496; function that may contribute to tumor cell survival. published online 8 November 2010 However, preliminary studies in our laboratory with the use of VEGF-neutralizing antibodies did not lead Keywords: VEGF; chemosensitivity; colorectal cancer; to changes in cell survival. Therefore, we sought to autocrine; intracrine; apoptosis understand the role and mechanism of intracrine VEGF signaling in CRC. In this report, we show that loss of intracrine VEGF signaling leads to an increase in spontaneous apoptosis and chemosensitivity. These Introduction findings have implications for a better understanding of mechanisms of action (or lack thereof) of VEGF- Vascular endothelial growth factor A (VEGF-A or targeted therapies when combined with chemotherapy in simply VEGF) was originally identified as a ‘perme- patients with metastatic CRC. ability factor’ and was later shown to also mediate endothelial cell proliferation (Senger et al., 1983, 1986; Connolly et al., 1989; Leung et al., 1989). VEGF is the Results prototypical member of a family of VEGF ligands that includes placental growth factor (PlGF) and VEGFs Loss of autocrine VEGF decreases growth of CRC cells A–E (Houck et al., 1991; Tischer et al., 1991; Ferrara To determine the role of autocrine VEGF in CRC cell et al., 2003). VEGF expression is upregulated in the growth and survival, we used two pairs of isogenic CRC majority of human tumors, and its expression is inversely lines in which the VEGF gene was disrupted. HCT116/ associated with survival. Standard models of VEGF VEGFÀ/À and LS174T/VEGFÀ/À cells were generated biology focus on tumor cell secretion of VEGF, whereby by homologous recombination-mediated deletion of the it acts in a paracrine manner to attract and stimulate VEGF alleles as described previously (Dang et al., 2006). The loss of VEGF expression in the VEGFÀ/À Correspondence: Dr LM Ellis, Department of Cancer Biology, Unit cells was confirmed by western blot analysis. As shown 173, The University of Texas M. D. Anderson Cancer Center, 1515 in Figure 1a, VEGF expression was undetectable Holcombe Boulevard, PO Box 173, Houston, TX 77230-1402, USA. À/À E-mail: [email protected] in conditioned medium from HCT116/VEGF and À/À Received 25 February 2010; revised 20 September 2010; accepted 21 LS174T/VEGF cells compared with expression in the September 2010; published online 8 November 2010 corresponding parental cells. Intracrine VEGF signaling promotes survival of CRC cells S Samuel et al 1206 Figure 2 Effect of loss of VEGF expression on viability of CRC cells in vitro.(a) Loss of VEGF expression led to increased spontaneous cell death. Cells were grown in 1% FBS medium for 48 h, fixed and stained with PI. Cell death was assessed by flow cytometry. (b) Increased spontaneous apoptosis in HCT116 VEGFÀ/À cells. Cells were grown in 1% FBS medium for 48 h, and apoptosis was assessed by flow cytometry following Annexin V staining. (c) Altered expression of apoptotic mediators in VEGFÀ/À cells. Whole-cell lysates of cells growing in 1% FBS medium for 48 h were collected and analyzed for expression of caspase-3, cleaved caspase-3, bax and survivin by western blot analysis. Actin served as a loading control. *P ¼ 0.004. these results represent the mean ± standard error of Figure 1 Effect of loss of VEGF expression on proliferation of CRC cells. (a) Loss of VEGF expression in CRC cells with deletion three independent experiments. A similar trend was / of VEGF alleles. VEGF-A levels in conditioned medium from observed in the LS174T/VEGFÀ À cells, although the HCT116 and LS174T VEGF þ / þ and VEGFÀ/À cells were difference was not statistically significant. determined by western blot analysis. VEGF-A expression was undetectable in the VEGFÀ/À cells. Equal protein loading of the gels was verified by Ponseu-S staining of the membranes. (b) The growth rates of HCT116 and LS174T VEGF þ / þ and VEGFÀ/À Loss of VEGF increases spontaneous apoptosis in CRC cells were assessed in terms of absorbance at 570 nm in an MTT cells assay. VEGFÀ/À cells showed significantly reduced proliferative Having observed decreased survival of the VEGFÀ/À activity compared with VEGF þ / þ cells. *Po0.01. cells, we sought to determine whether this result was due to an increase in spontaneous apoptosis. HCT116/ VEGF þ / þ and VEGFÀ/À cells were grown under low- To determine the biological effect of loss of autocrine/ serum conditions for 48 h, stained with Annexin V/ intracrine VEGF on CRC cells in vitro, we first assessed FITC and analyzed by flow cytometry. As shown in cell growth using the 3-(4,5-dimethyl-2-thiazol-2-yl)-2,5- Figure 2b, there was a significant increase in the diphenyl tetrazolium bromide (MTT) assay. To exclude spontaneous apoptotic rate of the HCT116/VEGFÀ/À the effects of exogenous VEGF (fetal bovine serum cells (17.2±0.6%) compared with VEGF þ / þ cells (FBS)-derived), the cells were grown for the assay under (11.5±0.7%, P ¼ 0.004). The Annexin V assay could low-serum (1%) conditions. As shown in Figure 1b, loss not be performed on the LS174T cells because these cells of VEGF expression led to significant inhibition in cell tend to grow in clumps and require extensive trypsiniza- growth compared with the control at days 2 and 3 in tion and manipulation to obtain a single-cell suspension; HCT116 cells (top panel, Po0.01) and at days 1, 2 and 3 these processes damage the membranes of the cells and in LS174T cells (bottom panel, Po0.01). As decreased cause non-specific binding of the dye, resulting in false- cell number could result from a combination of positive staining. deregulated cell proliferation and cell death, we inves- To determine whether the increased rate of sponta- tigated, using propidium iodide (PI)/fluorescence- neous apoptosis in the VEGFÀ/À cells could be overcome activated cell-sorting analysis, whether loss of VEGF by the addition of exogenous VEGF-A, HCT116 affected cell cycle progression in the cells. As shown in VEGFÀ/À cells were grown in serum-reduced medium Figure 2a, cell cycle analysis revealed a significantly (1% fetal calf serum) and stimulated with VEGF-A for higher percentage of HCT116/VEGFÀ/À cells 24 h. Cells were then stained with Annexin V/FITC and (12.3±0.8%) with sub-G0/G1 DNA content, compared analyzed by flow cytometry. However, this treatment with parental cells (6.1±0.4%, P ¼ 0.002) (Figure 2a); did not rescue the rate of spontaneous apoptosis in the Oncogene Intracrine VEGF signaling promotes survival of CRC cells S Samuel et al 1207 VEGFÀ/À cells, suggesting an intracrine function of and decreased expression of the pro-survival factor VEGF (data not shown). survivin in the VEGFÀ/À cells (Figure 2c). To examine the mechanism by which loss of VEGF contributes to increased spontaneous cell death, we analyzed the VEGF þ / þ and VEGFÀ/À CRC cells for Loss of autocrine VEGF increases the chemosensitivity of expression of apoptotic mediators. The caspases are key CRC cells to 5-fluorouracil mediators of apoptosis (Cohen, 1997; Cryns and Yuan, As loss of VEGF led to an increase in spontaneous 1998). Caspase-3, the effector caspase in the apoptotic cell death and apoptosis, we investigated whether it cascade, is activated through cleavage by caspase-9 as a would also affect cells’ response to chemotherapeutic result of an increase in mitochondrial permeability and drugs, such as 5-fluorouracil (5FU).
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