雌激素受体GPR30在大鼠下颌下腺组织中的定位、核心片段克隆及序列分析

Distribution,cloning and analysis of partial sequence of GPR30 in submaxillary gland of rats

目的探讨雌激素受体G蛋白耦联受体30(GPR30)在大鼠下颌下腺组织中的表达,为进一步研究此受体对下颌下腺的功能调节提供理论依据。方法取SD大鼠4只,腹腔麻醉后切取下颌下腺,采用免疫组织化学和原位杂交方法进行定位研究;从下颌下腺组织中分别提取总RNA,应用RT-PCR方法获得GPR30基因的cDNA核心序列,并进行序列分析。结果大鼠下颌下腺浆液性腺泡及颗粒曲管上皮细胞呈GPR30免疫反应阳性,阳性物质分布于细胞质和细胞膜上,细胞核呈阴性反应。上述细胞同样含有GPR30mRNA杂交信号,信号物质亦分布于细胞质内,细胞核呈阴性反应。经序列分析发现,从大鼠下颌下腺组织中扩增出GPR30基因的特异性条带。结论大鼠下颌下腺浆液性腺泡上皮细胞能够表达雌激素受体GPR30,说明其可能是雌激素快速作用的靶器官。

Objective To investigate the localization G protein couple receptor 30 （GPR30） and its mRNA in submaxillary gland, and to supply theoretic evidence for further studying functional significance of the GPR30 in submaxillary gland of rats. Methods Four male SD rats were sacrificed by cervical dislocation after the intraperitoneal anesthesia, and excised the submaxillary glands. The distribution of GPR30 and its mRNA were studied through immunohistochemistry and in situ hybridization in the experiment. After isolation of the total RNA from the submaxillary gland, RT-PCR was conducted to obtain GPR30 cDNA by using the specific primers. The products of PCR were analyzed by sequencing with Sanger’s method. Results The serous acinus epithelial cells and granular convoluted epithelial cells in submaxillary gland of rats showed GPR30 immunoreactivity, which were located in cytoplasm with negative nuclei. GPR30 mRNA hybridized signals were also detected in cytoplasm in the above cells. The products of PCR is identical to that of the GPR30 sequence of rats. Conclusion The serous acinus and granular convoluted epithelial cells not only express GPR30 but also may be a target organ by rapid estrogen signaling pathway in submaxillary gland of rats. This may be involved in the functional regulation of submaxillary gland.