Vascular endothelial growth factor (VEGF), also known as vascular permeability factor (VPF), is an angiogenic factor playing an important role in tumor growth. VEGF/VPF interacts with endothelial cells by way of two h...Vascular endothelial growth factor (VEGF), also known as vascular permeability factor (VPF), is an angiogenic factor playing an important role in tumor growth. VEGF/VPF interacts with endothelial cells by way of two high-affinity receptor tyrosine kinases: flt-1 and KDR. The vast majority of published studies have described expression of the VPF/VEGF receptors specifically in endothelial cells. To elucidate the further function of VEGF in solid tumor development, the coex-pression of VEGF and KDR in gastric adenocarcinoma MGC803 cell lines was shown by reverse transcription polymerase chain reaction (RT-PCR). The MGC803 tumor cells could also be strongly immunostained for KDR by immunocytochemistry. It was further demonstrated that exogenous VEGF-165 can stimulate the MGC803 cell growth in both dose-dependent and time-dependent manners by 3H-thymidine incorporation. Furthermore, anti-VEGF165 monoclonal antibody and anti-KDR monoclonal antibody could dose-dependently block the VEGF166-induced cell展开更多
Vascular endothelial growth factor(VEGF) is primarily known as a proangiogenic factor and is one of the most important growth and survival factors affecting the vascular endothelium. However, recent studies have shown...Vascular endothelial growth factor(VEGF) is primarily known as a proangiogenic factor and is one of the most important growth and survival factors affecting the vascular endothelium. However, recent studies have shown that VEGF also plays a vital role in the immune environment. In addition to the traditional growth factor role of VEGF and VEGF receptors(VEGFRs), they have a complicated relationship with various immune cells. VEGF also reportedly inhibits the differentiation and function of immune cells during hematopoiesis. Dendritic cells(DCs), macrophages, and lymphocytes further express certain types of VEGF receptors.VEGF can be secreted as well by tumor cells through the autocrine pathway and can stimulate the function of cancer stemness.This review will provide a paradigm shift in our understanding of the role of VEGF/VEGFR signaling in the immune and cancer environment.展开更多
Objective: By studying the influence of low-dose total body irradiation to proliferating cell nuclear antigens (PCNA), epidermal growth factor receptor (EGFR), erythropoietin (EPO) and vascular endothelial growth fact...Objective: By studying the influence of low-dose total body irradiation to proliferating cell nuclear antigens (PCNA), epidermal growth factor receptor (EGFR), erythropoietin (EPO) and vascular endothelial growth factor receptor (VEGFR) of tumor tissues in mice bearing S180 sarcoma, to further explore the mechanism of low doses radiation. Methods: S180 sarcoma cells were implanted subcutaneously into 58 male Kunming mice. Randomly these mice were divided into sham-irradiation (S) group and low-dose radiation (LDR) group. 12 days after implantation, the mice in LDR group were once delivered 75 mGy total-body 60Co γ-ray irradiation, while the mice in S group were left without irradiation. Then the mice in LDR group were executed at 6 h (LDR-6h group), 12 h (LDR-12 h group), 24 h (LDR-24 h group), 48 h (LDR-48 h group) and 72 h (LDR-72h group) after irradiation. Tumor tissues were weighed and histological observed. Immunohistochemical staining was used to detect the expression of PCNA, VEGF, EPO and VEGFR of tumor tissues. Results: Though there was no significant difference between LDR group and S group in tumor weight, after irradiation the expression of PCNA and EPO of tumor tissues in LDR group decreased with time. LDR-24h, LDR-48h and LDR-72h groups were all statistically significantly different from S group. The expression of EGFR and VEGFR also decreased, and LDR-24h group was the lowest (P < 0.05). Conclusion: Seventy-two h after low-dose total body irradiation, there was no significant change in tumor size of mice bearing S180 sarcoma. Low-dose total body radiation decreased the expression of PCNA inhibiting tumor growth; reduced the expression of EGFR in tumor tissue impacting the signal transduction of tumor cells. The study also indicated that low-dose total body irradiation, within a certain period of time, can decrease the expression of hypoxia factor EPO and VEGFR, which may improve the situation of tumor hypoxia and radiosensitivity of tumor itself.展开更多
文摘Vascular endothelial growth factor (VEGF), also known as vascular permeability factor (VPF), is an angiogenic factor playing an important role in tumor growth. VEGF/VPF interacts with endothelial cells by way of two high-affinity receptor tyrosine kinases: flt-1 and KDR. The vast majority of published studies have described expression of the VPF/VEGF receptors specifically in endothelial cells. To elucidate the further function of VEGF in solid tumor development, the coex-pression of VEGF and KDR in gastric adenocarcinoma MGC803 cell lines was shown by reverse transcription polymerase chain reaction (RT-PCR). The MGC803 tumor cells could also be strongly immunostained for KDR by immunocytochemistry. It was further demonstrated that exogenous VEGF-165 can stimulate the MGC803 cell growth in both dose-dependent and time-dependent manners by 3H-thymidine incorporation. Furthermore, anti-VEGF165 monoclonal antibody and anti-KDR monoclonal antibody could dose-dependently block the VEGF166-induced cell
基金supported by grants from the key program of the National Basic Research Program of China (973 program) (Grant No. 2012CB9333004)the National Natural Science Foundation of China (Grant No. 81401888)
文摘Vascular endothelial growth factor(VEGF) is primarily known as a proangiogenic factor and is one of the most important growth and survival factors affecting the vascular endothelium. However, recent studies have shown that VEGF also plays a vital role in the immune environment. In addition to the traditional growth factor role of VEGF and VEGF receptors(VEGFRs), they have a complicated relationship with various immune cells. VEGF also reportedly inhibits the differentiation and function of immune cells during hematopoiesis. Dendritic cells(DCs), macrophages, and lymphocytes further express certain types of VEGF receptors.VEGF can be secreted as well by tumor cells through the autocrine pathway and can stimulate the function of cancer stemness.This review will provide a paradigm shift in our understanding of the role of VEGF/VEGFR signaling in the immune and cancer environment.
基金Supported by a grant from the National Natural Scientific Foundation of China (No: 30030781)
文摘Objective: By studying the influence of low-dose total body irradiation to proliferating cell nuclear antigens (PCNA), epidermal growth factor receptor (EGFR), erythropoietin (EPO) and vascular endothelial growth factor receptor (VEGFR) of tumor tissues in mice bearing S180 sarcoma, to further explore the mechanism of low doses radiation. Methods: S180 sarcoma cells were implanted subcutaneously into 58 male Kunming mice. Randomly these mice were divided into sham-irradiation (S) group and low-dose radiation (LDR) group. 12 days after implantation, the mice in LDR group were once delivered 75 mGy total-body 60Co γ-ray irradiation, while the mice in S group were left without irradiation. Then the mice in LDR group were executed at 6 h (LDR-6h group), 12 h (LDR-12 h group), 24 h (LDR-24 h group), 48 h (LDR-48 h group) and 72 h (LDR-72h group) after irradiation. Tumor tissues were weighed and histological observed. Immunohistochemical staining was used to detect the expression of PCNA, VEGF, EPO and VEGFR of tumor tissues. Results: Though there was no significant difference between LDR group and S group in tumor weight, after irradiation the expression of PCNA and EPO of tumor tissues in LDR group decreased with time. LDR-24h, LDR-48h and LDR-72h groups were all statistically significantly different from S group. The expression of EGFR and VEGFR also decreased, and LDR-24h group was the lowest (P < 0.05). Conclusion: Seventy-two h after low-dose total body irradiation, there was no significant change in tumor size of mice bearing S180 sarcoma. Low-dose total body radiation decreased the expression of PCNA inhibiting tumor growth; reduced the expression of EGFR in tumor tissue impacting the signal transduction of tumor cells. The study also indicated that low-dose total body irradiation, within a certain period of time, can decrease the expression of hypoxia factor EPO and VEGFR, which may improve the situation of tumor hypoxia and radiosensitivity of tumor itself.
