摘要
AIM： To investigate the effect of N-desulfated heparin on tumor metastasis and angiogenesis, and expression of vascular endothelial growth factor （VEGF） of orthotopic implantation of human gastric carcinoma in male severe combined immune deficiency （SCID） mice. METHODS： Human gastric cancer SGC-7901 cells were orthotopically implanted into the stomach of SC/D mice. The mice were randomly divided into normal saline group and N-desulfated heparin group. One week after operation, the mice in N-desulfated heparin group reo ceived i.v. injections of N-desulfated heparin （Shanghai Institute of Cell Biology, Chinese Academy of Sciences, 10 mg/kg.d） twice weekly for 3 wk. The mice in normal saline group received i.v. injections of normal saline （100 μL） twice weekly for 3 wk. The mice were sacrificed six weeks after implantation. Tumor metastasis was evaluo ated histologically for metastasis under microscope. Intratumoral microvessel density （MVD） and VEGF expression were evaluated immuohistochemically. VEGF mRNA expression in gastric tissue of SC/D mice was detected by real time PCR. RESULTS： The tumor metastasis rate was 80% in normal saline group and 20% in N-desulfated heparin group （P 〈 0.05）. MVD was 8.0 ± 3.1 in normal saline group and 4.3 ± 1.8 in N-desulfated heparin group （P 〈 0.05）. VEGF positive immunostaining was found in cytoplasm of cancer cells. The rate of VEGF positive expression was higher in normal saline group than in N-desulfated hepa- rin treated group （90% vs 20%, P 〈 0.05）. VEGF mRNA expression was significantly inhibited by N-desulfated heparin and was higher in normal saline group than in N-desulfated heparin group （Ct value 19.51 ± 1.01 vs 22.55± 1.36, P 〈 0.05）. N-desulfated heparin significantly inhibited the expression of VEGF mRNA in cancer cells. No bleeding occurred in N-desulfated heparin group. CONCLUSION： N-desulfated heparin can inhibit metastasis of gastric cancer by suppressing tumor VEGF expression and tumor angiogenesis, but has no obvious anticoagulant activity.
AIM: To investigate the effect of N-desulfated heparin on tumor metastasis and angiogenesis, and expression of vascular endothelial growth factor (VEGF) of ortho- topic implantation of human gastric carcinoma in male severe combined immune deficiency (SCID) mice.? METHODS: Human gastric cancer SGC-7901 cells were orthotopically implanted into the stomach of SCID mice.? The mice were randomly divided into normal saline group and N-desulfated heparin group.? One week after operation, the mice in N-desulfated heparin group re- ceived i.?v.? injections of N-desulfated heparin (SShhaanngghhaaii Institute of Cell Biology, Chinese Academy of Sciences, 10 mg/kg.?d)) ttwwiiccee wweeeekkllyy ffoorr ???? wwkk..?? ??hhee mmiiccee iinn nnoorrmmaall saline group received i.?v.? injections of normal saline (100 μL) twice weekly for ?? wk.? ?he mice were sacrificed six weeks after implantation.? ?umor metastasis was evalu- ated histologically for metastasis under microscope.? In- tratumoral microvessel density (MVD) and VEGF expres- sion were evaluated immuohistochemically.? VVVEEEGGGFFF mmmRR?NNNAAA expression in gastric tissue of SCID mice was detected by real time PC?.? RESULTS: The tumor metastasis rate was 80% in nor- mal saline group and 20% in N-desulfated heparin group (P ???? 00..??00??))..?? MMVVDD wwaass ??..??00 ???? ????..??11 iinn nnoorrmmaall ssaalliinnee ggrroouupp and 4.??? ?? 1.?? in N-desulfated heparin group (P ???? 00..??00??))..?? VEGF positive immunostaining was found in cytoplasmof cancer cells.? ?he rate of VEGF positive expression was higher in normal saline group than in N-desulfated hepa- rin treated group (90% vs 20%, P ???? 00..??00??))..?? VVEEGGFF mm??NNAA expression was significantly inhibited by N-desulfated heparin and was higher in normal saline group than in N-desulfated heparin group (Ct value 19.??1 ?? 1.?01 vs 22.??? ?? 1.???6, P ???? 00..??00??))..?? NN--ddeessuullffaatteedd hheeppaarriinn ssiiggnniiffii- cantly inhibited the expression of VEGF mRNA in can- cer cells.? No bleeding occurred in N-desulfated heparin group.? CONCLUSION: N-desulfated heparin can inhibit me- tastasis of gastric cancer by suppressing tumor VEGF expression and tumor angiogenesis, but has no obvious anticoagulant activity.?
基金
Supported by the Scientific Foundation of Shanghai Public Health Administration, No.034045
作者简介
Correspondence to： Jin-Lian Chen, Department of Gastroenterology, Shanghai Sixth People＇s Hospital, Shanghai Jiaotong University, Shanghai 200233, China. wqq-021002@163.com Telephone： ＋86-21-64369181 Fax： ＋86-21-64369181
