FSHR在腫瘤血管形成中作用的初步研究
[Abstract]:The follicle-stimulating hormone receptor (FSHR) is a transmembrane glycoprotein that is a member of the G protein-coupled receptor family. In adults and animals, FSHR is expressed only on the surface of testicular Sertoli cells and ovarian granulosa cells, and in the endothelial cells of testis and ovary. In this study, human Umbilical Vein Endothelial Cells (HU) were used to study the role of gonadotrophin follicle stimulating hormone (FSH) in gonadal development. VEC) was used as a model of angiogenesis to analyze the effects of FSH on proliferation, migration and tubulation of HUVEC cells. In addition, the effects of blocking the binding of FSH-FSHR on proliferation, migration and tubulation of HUVEC cells were studied by using VHHFSHR-06, an anti-FSHR nano-antibody, and suramin, an antagonist of FSH. This study included two aspects: 1. The role of FSHR in tumor angiogenesis was explored by using in vitro angiogenesis model HUVEC cells to explore the role of FSH-FSHR in angiogenesis. The FSHR in HUVEC cells was detected by RT-PCR, Western blotting, cytoimmunochemistry and vascular test. The results showed that FSHR was expressed in both HUVEC and ovarian adenocarcinoma cells (Caov-3), but not in ovarian cancer cells (Skov-3). The results showed that FSH (600 ng/mL) significantly promoted the migration of HUVEC cells, while different concentrations of sulamine inhibited the migration stimulated by FSH in a dose-dependent manner. FSH (600 ng/mL) also promoted the proliferation of HUVEC cells (P 0.01), and sulamine inhibited the proliferation of HUVEC cells induced by FSH. In addition, suramin inhibited the tube formation of HUVEC cells stimulated by FSH. In conclusion, FSH could promote the migration, proliferation and tubulation of HUVEC cells expressing FSHR. Lamine inhibited the migration and proliferation of FSHR-positive HUVEC and Caov-3 cells, but had no effect on FSHR-negative CT-26 cells. It was preliminarily suggested that FSH might play the above role by acting on its receptor FSHR. 2. The affinity maturation of anti-FSHR nano-antibody VHH-06 from natural camel non-immune library was achieved by two methods. The affinity of the selected anti-FSHR nano-anti-VHHFSHR-06 was improved in order to make better use of the antibody to carry out the blocking test of FSH-FSHR and evaluate its anti-angiogenesis effect. (1) Site-directed saturation mutation was used to carry out random amino acid mutation at the CDR3 sequence of VHH-06 nucleic acid except termination codon, resulting in 15 random processes of length. CDR3 mutant library consisting of mutant amino acids was linked to the phage vector pMECS, and transformed into TG1 competent cells by electroporation. The mutant library (NNNY) NL-06/CDR3 with a capacity of 7.36*108 was obtained. The VH06 mutant library (NNNNY) NL-06/CDR3 was screened by using FSHR234 protein for six rounds of repeated affinity screening. Polyclonal phage ELISA assay also showed that antigen-specific phages were accumulated from the fourth round, but no clones were found to bind to each other in the subsequent phage ELISA assay of 100 clones from the sixth round. The reason may be due to the lack of functional diversity of the mutant library and the quality of the library. (2) Coupling VHH-06 with COMP48 is an attempt to improve the binding ability of nano-antibodies to FSHR. COMP48 is a 48-peptide with helical convolution structure derived from human cartilage oligomeric matrix protein. The carboxyl end of VHH-06 is coupled with COMP48 and transformed into BL21 for expression and purification under non-reduced conditions, 110. KD, the target protein of 25 kD size under reduction condition, did not significantly improve the binding ability to FSHR in subsequent ELISA detection. Two strategies were used to improve the affinity of antibodies, but the expected results were not achieved. These results suggest that FSH may play an important role in the proliferation, tube formation and migration of HUVEC cells by acting on its receptor FSHR.
【學(xué)位授予單位】:新疆大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R730.2
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