Abstract 【Objective】 The aim of study was to identify molecular characteristics and three-dimensional structure of AGTR2 in the bovine follicular development, and the function was analyzed by combining expression characteristics of AGTR2 in different physiological follicles.【Method】Ovaries in the bovine follicular were observed by B-type ultrasonography (twice a day), removed from cows when DF and SF appeared, and then separated DF and SF; GCs were isolated, total RNA was extracted and detected by RT-PCR, specific primers were amplified and sequenced, and CDS region sequence structure was obtained; the bioinformatics method was used to analyze its sequence structure, relationship and three-dimensional structure; the qRT-PCR primers of AGTR2 and reference gene RPLP0 were designed to analyze differential expression level of AGTR2 in DF and SF; DF and SF of another cow were fixed with 4% paraformaldehyde, positive, negative control groups and experimental groups were set, expression level and localization of AGTR2 were analyzed by immunohistochemistry. 【Result】The results showed that total length of AGTR2 CDS region was 1 089 bp, encoding 362 amino acids; BLAST analysis of amino acid sequence of AGTR2 and the corresponding amino acid sequence of other 24 animals obtained by NCBI database indicated that the sequence had the highest similarity with buffalo (99.4%) and 92.0%-98.9% with other animals; The three-dimensional structure and functional domain analysis showed that AGTR2 possessed 7 parallel alpha helical structures across the cell membrane, which was a typical G protein-coupled receptor; the results of qRT-PCR analysis showed that expression level of AGTR2 mRNA in DF was significantly higher than SF (P<0.01), and the differential expression multiple was up to 7.47 times. The immunohistochemical analysis showed that AGTR2 was expressed in GCs and membrane cells layer of DF and SF, and the specific color intensity showed that expression of AGTR2 in SF membrane cells was higher than DF. 【Conclusion】AGTR2 belonged to G protein-coupled receptor and conforms to basic characteristics of CART receptor, and the study laid a foundation for further study on mechanism of AGTR2 regulating signal pathway and hormone secretion during bovine follicular development, meanwhile, it was of great significance for identification of CART receptor and in-depth explanation of mechanism of CART regulating bovine follicular development. Keywords:bovine;follicular development;CART;G protein-coupled receptor;AGTR2
PDF (8399KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 朱芷葳, 侯淑宁, 郝庆玲, 景炅婕, 吕丽华, 李鹏飞. 牛卵泡AGTR2序列结构及表达特性分析[J]. 中国农业科学, 2020, 53(7): 1482-1490 doi:10.3864/j.issn.0578-1752.2020.07.016 ZHU ZhiWei, HOU ShuNing, HAO QingLing, JING JiongJie, LÜ LiHua, LI PengFei. Sequence Structure and Expression Characteristics Analysis of AGTR2 in Bovine Follicle[J]. Scientia Acricultura Sinica, 2020, 53(7): 1482-1490 doi:10.3864/j.issn.0578-1752.2020.07.016
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0 引言
【研究意义】牛属于单胎动物,发情期通常仅有一个成熟卵泡排卵,卵巢上其他卵泡最终不能发育为排卵卵泡而走向闭锁。因此,优良种畜卵母细胞来源严重制约着胚胎工程技术的广泛应用。可卡因-苯丙胺调节转录肽(cocaine and amphetamine regulated transcript peptide,CART)是下丘脑分泌的神经肽,其受体为G蛋白偶联受体(G-protein-coupled receptors,GPCRs)家族。课题组合作研究发现,在牛卵泡发育中CART是一个重要的卵泡发育调节因子[1,2,3],并通过免疫共沉淀、蛋白分子建模和分子对接对CART的受体展开筛选,将血管紧张素Ⅱ受体-2型(angiotensin II receptor,type 2,AGTR2)作为CART的候选受体[4]。本研究通过牛卵泡AGTR2序列测定预测蛋白功能域,并对优势卵泡(dominant follicles,DF)和从属卵泡(subordinate follicles,SF)AGTR2表达模式进行分析,为后期CART受体的鉴定奠定基础。【前人研究进展】牛卵泡发育过程中,当卵泡波中形成了具有排卵潜力的卵泡时,在黄体素(luteinizing hormone,LH)的刺激下释放卵子,其他卵泡则丧失排卵能力[5,6]。在排卵期前,卵泡类固醇物质雄激素、雌激素和孕酮,在促性腺激素和调节因子的作用下,共同刺激牛卵泡颗粒细胞(granulosa cells,GCs)分泌前列腺素,诱导卵泡排卵[7,8,9]。AGTR2属于细胞膜GPCRs,在细胞信号转导和激素调控方面具有重要作用[10]。研究表明,肾脏AGTR2对心血管和交感神经调节、水和电解质平衡以及激素分泌具有调控作用[11,12];AGTR2作为血管紧张素系统关键的一类生物活性肽,对刺激牛排卵前的卵泡发育[13]、兔卵巢正常发育和卵泡形成[14,15]具有重要调控作用。【本研究切入点】牛卵泡发育中卵泡优势化标志着排卵卵泡即将形成,该阶段发育卵泡分化为两类具有显著生理特征的DF和SF,其中DF具有发育为排卵卵泡的潜力,而SF则趋向闭锁。本研究以牛DF和SF作为研究对象,对CART的候选受体AGTR2结构功能域和表达模式进行研究,具有可靠的理论依据。【拟解决的关键问题】试验中运用序列测定、结构预测、表达和定位探讨性研究AGTR2在牛卵泡发育中的调控作用,也为进一步鉴定CART的受体提供依据。
A、B、C分别为优势卵泡阳性对照组、试验组和阴性对照组;D、E、F分别为从属卵泡阳性对照组、试验组和阴性对照组;GC:颗粒细胞;TC:膜细胞;比例尺20 μm Fig. 7Immunohistochemical analysis of AGTR2 in bovine DF vs. SF (400×)
A, B, C: Control group, experiment group and negative control group of DF, respectively; D, E, F: Control group, experiment group and negative control group of SF, respectively; GC: Granulosa cells; TC: Theca cells; Scale 20 μm
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