Effect of estradiol on proliferation of rat hippocampal neural stem cells / 解剖学报

Objective The aim is to observe the role and mechanism of estradiol ( E2 ) on the proliferation of rat hippocampal neural stem cells ( NSCs ) .Methods Twenty hippocampi from embryonic 17-day ( E17 ) SD rats were dissociated and plated into culture flasks with NSCs specific medium containing different concentrations of estradiol .The proliferation and the vitality of NSCs were detected by immunofluorescence against BrdU and MTT assay .The expression of estrogen receptors ( ERαand ERβ) was measured by immunofluorescence staining combined with Nestin double labeling . Results BrdU and MTT assay results showed that the cell number increased when the concentration of estradiol increased from 10 -10 to 10 -8 mol/L.The number of cell proliferation and the viability of cells were best at the concentration of 10 -8 mol/L compared to the other groups .However, when the estradiol concentration was increased from 10-8 to 10 -6 mol/L, the cell proliferative capacity declined gradually .Double immunofluorescence labeling showed that the two types of estrogen receptors ( ERαand ERβ) were expressed in the cultured hippocampal NSCs .Conclusion Estradiol promotes the proliferation of hippocampal NSCs in a certain concentration range , and ERαand ERβmay be involved in the estradiol-induced proliferation .

Effects of Extracts from the Seed of Litchi on the Expression of ER and PR in Rat Mammary Tissue and Apoptosis of Mammary Glandular Cell / 中国药房

OBJECTIVE: To study the effects of extracts of the seed of Litchi (ESL) on the expression of estradiol receptor (ER) and progestogen receptor (PR) in mammary tissue and apoptosis of mammary glandular cells in rats with hyperplasia of mammary glands (HMG). METHODS: The HMG model was induced by intramuscularly injecting with 0.5 mg?kg-1 estradiol benzoate for 25 days, subsequently intramuscularly injecting with 4 mg?kg-1 progesterone for 5 days. 60 healthy nonfertile SD rats were divided into normal group, model group, rujieping group and high-dose, medium-dose and low-dose ESL groups, treating with distilled water, distilled water, 3.3 g?kg-1 Rujieping and 44, 22, 11 g?kg-1 ESL via i.g. gtt once a day for 30 days, respectively. Immunohistochemical method was applied to observe the expression of ER and PR in rat mammary tissue and apoptosis of mammary glandular cells. Uterus index was also calculated. RESULTS: High-dose and medium-dose of ESL can inhibit the expression of ER and PR of mammary gland in HMG rats and induce apoptosis of mammary glandular cells(P