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《Chinese Journal of Animal and Veterinary Sciences》 2019-01
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Distribution and Expression of Estrogen Receptors in Mammary Gland of Yak during Mid-lactating Period and Non-lactating Period

FANG Lili;YANG Jinfang;JING Haixia;YU Hongxian;ZHANG Qinwen;LI Li;WEI Qing;WANG Xinyue;LI Feng;CHEN Yonghao;YANG Yuying;LI Guangzhen;Veterinary Medicine Department of College of Agriculture and Animal Husbandry,Qinghai University;  
In order to reveal the distribution and expression of estrogen receptorα (ERα) and estrogen receptorβ (ERβ) in mammary gland of yak during mid-lactating and non-lactating periods.The mammary tissues from each of 5healthy yaks in the mid-lactating (3-4months after parturition) and non-lactating periods (1month after weaning) were collected,the localization,distribution and protein content of ERαand ERβwere tested by using the SP immunohistochemical staining method and the Western blot method,respectively.The results showed that predominantcytoplasmic staining for ERαwere found in gland bubble epithelial cells and weak nuclear staining for ERαwere found in fat cells in interlobular connective tissue and vascular endothelial cells in mammary gland during mid-lactating period.But during non-lactating period,distribution of ERα-positive material was contrary to that in mid-lactating period.Predominant cytoplasmic staining for ERβwere found in the gland bubble epithelial cells during mid-lactating period and weak nucleus staining for ERβwere found in vascular endothelial cells and fat cells.During non-lactating period,ERβ-positive material were found in cytoplasm of duct epithelial cells,in the nucleus of stroma cells in interlobular connective tissue and vascular endothelial cells,and in cytoplasm of acinar epithelial cells,but the number of positive cells was less than that during mid-lactating period.The relative expression of ERαprotein in yak mammary gland tissue in non-lactating period was significantly higher than that in mid-lactating period (P0.05),while there was no significant difference in the relative expression of ERβprotein between mid-lactating and non-lactating periods (P0.05).The different expression patterns of estrogen receptor subtypes in mammary gland of yak in different periods suggested that ERαand ERβin mammary gland of yak might perform different functions during the process of mammary development and lactation.
【Fund】: 青海省科技厅项目(2015-ZJ-710);; 国家自然科学基金(31660699)
【CateGory Index】: S823.85
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