Acta Anatomica Sinica ›› 2020, Vol. 51 ›› Issue (2): 220-227.doi: 10.16098/j.issn.0529-1356.2020.02.012

• Cancer Biology • Previous Articles     Next Articles

Inhibitory effect of recombinant human semaphorin 3A on angiogenesis of gastric cancer and the associated mechanisms#br#

FENG Pin1  FAN Wen-jing LIU Lei2  XU Qian3  LI Yu-hong4  ZUO Yan-zhen ZHOU Bo6  ZHAO Xiang-yang7*   

  1. 1. Department of Pathology; 2.Department of Immunology; 3.Basic Medical Institute; 4. Academic Affairs Office;5. Department of Pharmacology, Chengde Medical University, Hebei Chengde 067000, China; 6. Department of Neurology;7. Department of General Surgery, 981 Hospital of Chinese PLA, Hebei Chengde 067000, China
  • Received:2019-01-02 Revised:2019-04-01 Online:2020-04-06 Published:2020-04-06
  • Contact: ZHAO Xiang-yang E-mail:2226879436@qq.com

Abstract:

Objective  To investigate the expression of semaphorin 3A (Sema3A) and its receptor neuropilin-1 (NRP-1) in gastric cancer and its correlation with microvessel density (MVD),and then to explore the effect of recombinant human Sema3A on angiogenesis of gastric cancer and the associated mechanisms.   Methods  Forty cases of gastric cancer tissues and its corresponding adjacent normal tissues were used to detecte the expression of Sema3A, NRP-1 and MVD in tissues by immunohistochemistry method . The expression level of Sema3A in serum of gastric cancer patient group and normal control group were measured by Enzyme-linked immuno-sorbent assay (ELISA). Western blotting was used to detect the expression of Sema3A and NRP-1 in five gastric cancer cell lines (MGC-803,HGC-27,MKN-28,SGC-7901,MKN-45) and human gastric mucosal epithelial cell (GES-1). Transwell chamber was used to construct non-contact in vitro co-culture system, in which the effects of different concentrations of recombinant human Sema3A on angiogenesis in gastric cancer were analyzed by tube formation assay preliminarily. The expression levels of vascular endothelial growth factor receptor 2 (VEGFR2) and NRP-1 in co-culture system were detected by Western blotting.   Results  The expression  levels of Sema3A in gastric cancer tissues, cell lines and patient serum were significantly lower than that in the control group(P<0.05), while the expression of NRP-1 in gastric cancer tissues and MKN-28 cells was significantly increased, and both of them were associated with TNM staging of gastric cancer(P<0.05). In vitro co-culture system, The tube forming abilities of human umbilical vein endothelial cell (HUVEC) were decreased in recombinant human Sema3A treated group, and this phenomenon was concentration dependent. The expression of VEGFR2 protein was down-regulated by recombinant human Sema3A.   Conclusion  The expression of Sema3A was decreased in gastric cancer tissues, cell lines and patient serum, and negatively correlated with microvessel density. The recombinant human Sema3A could inhibit the angiogenesis of gastric cancer in vitro, which may be related to down-regulation of VEGFR2 protein expression.

Key words: Gastric cancer,  , Semaphorin3A,  , Umbilical vein endothelial cell,  , Co-culture system, Tube formation assay,  , Western blotting,  , Human

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