Objective To observe the effects of Dexamethasone (Dex), a synthetic glucocorticoid, on glucocorticoid receptor expression in the human ovarian carcinoma cell line 3AO. The molecular mechanism of glucocorticoid (GC) o...Objective To observe the effects of Dexamethasone (Dex), a synthetic glucocorticoid, on glucocorticoid receptor expression in the human ovarian carcinoma cell line 3AO. The molecular mechanism of glucocorticoid (GC) on 3AO cells was also studied.Methods The expression and regulation of the glucocorticoid receptor in 3AO cells was studied by utilizing radioligand binding assay and quantitative RT-PCR. Results High affinity and low capacity GR existed in 3AO cells, in addition, GR binding activity was down-regulated by Dex in a time-dependent manner, to a level about 28.34% of control following 24 hours treatment, with a concomitant decrease in GR mRNA. The induction of alkaline phosphatase (AKP) activity by Dex was reversed by RU486, a potent glucocorticoid antagonist.Conclusion In 3AO cells, functional GR which can be down-regulated by Dex at the protein and mRNA level, exists suggesting that the regulating effects of Dex on GR occur at least partially at the GR mRNA level, and that the cellular effects of Dex on 3AO cells might be mediated by GR.展开更多
Objective：To observe the effect of moxibustion on learning and memory abilities,corticosterone and glucocorticoid receptor（GR） in subacute aging rats.Methods：Twenty four Sprague-Dawley（SD） rats were randomly div...Objective：To observe the effect of moxibustion on learning and memory abilities,corticosterone and glucocorticoid receptor（GR） in subacute aging rats.Methods：Twenty four Sprague-Dawley（SD） rats were randomly divided into a normal group,a model group and a moxibustion group,8 rats in each group.Rats in the model group and the moxibustion group were subcutaneously injected with 25% D-galactose [125 mg/（kg·bw）] for 40 d continuous;rats in the normal group were injected with saline at the same position for 40 d continuous.Rats in the moxibustion group were given mild moxibustion at bilateral Shenshu（BL 23） at the same time of modeling;rats in the normal group and the model group were only identically grabbed without moxibustion for 40 d.The learning and memory abilities of rats were observed using the Morris water maze at the end of the experiment.Abdominal aorta blood and thymus were collected after water maze experiment.Enzyme-linked immunosorbent assay（ELISA） was used to detect serum corticosterone level,and immunohistochemical method was used to detect the expression of thymus GR.Results：Compared with the normal group,rats in the model group showed that a significantly longer escape latency time（P〈0.01） on the third and the fourth days;number of times crossing the platform in 70 s significantly reduced（P〈0.01）;activity times in the fourth quadrant significantly decreased（P〈0.05）;serum corticosterone levels increased（P〈0.01）;thymus GR expression decreased（P〈0.05）.Compared with the model group,rats in the moxibustion group showed that the escape latency times were significantly shorter on the third,the fourth and the fifth days（P〈0.01,P〈0.05）;number of times crossing the platform in 70 s significantly increased（P〈0.05）;activity times in the fourth quadrant significantly increased（P〈0.05）;serum corticosterone levels decreased（P〈0.05）;thymus GR expression increased（P〈0.05）.Conclusion：Moxibustion could improve the learning and m展开更多
文摘Objective To observe the effects of Dexamethasone (Dex), a synthetic glucocorticoid, on glucocorticoid receptor expression in the human ovarian carcinoma cell line 3AO. The molecular mechanism of glucocorticoid (GC) on 3AO cells was also studied.Methods The expression and regulation of the glucocorticoid receptor in 3AO cells was studied by utilizing radioligand binding assay and quantitative RT-PCR. Results High affinity and low capacity GR existed in 3AO cells, in addition, GR binding activity was down-regulated by Dex in a time-dependent manner, to a level about 28.34% of control following 24 hours treatment, with a concomitant decrease in GR mRNA. The induction of alkaline phosphatase (AKP) activity by Dex was reversed by RU486, a potent glucocorticoid antagonist.Conclusion In 3AO cells, functional GR which can be down-regulated by Dex at the protein and mRNA level, exists suggesting that the regulating effects of Dex on GR occur at least partially at the GR mRNA level, and that the cellular effects of Dex on 3AO cells might be mediated by GR.
基金supported by National Natural Science Foundation of China(No.81303029)National Basic Research Program of China(973 Program,No.2009CB522900)Natural Science Foundation of Shanghai(No.12ZR1429700)~~
文摘Objective：To observe the effect of moxibustion on learning and memory abilities,corticosterone and glucocorticoid receptor（GR） in subacute aging rats.Methods：Twenty four Sprague-Dawley（SD） rats were randomly divided into a normal group,a model group and a moxibustion group,8 rats in each group.Rats in the model group and the moxibustion group were subcutaneously injected with 25% D-galactose [125 mg/（kg·bw）] for 40 d continuous;rats in the normal group were injected with saline at the same position for 40 d continuous.Rats in the moxibustion group were given mild moxibustion at bilateral Shenshu（BL 23） at the same time of modeling;rats in the normal group and the model group were only identically grabbed without moxibustion for 40 d.The learning and memory abilities of rats were observed using the Morris water maze at the end of the experiment.Abdominal aorta blood and thymus were collected after water maze experiment.Enzyme-linked immunosorbent assay（ELISA） was used to detect serum corticosterone level,and immunohistochemical method was used to detect the expression of thymus GR.Results：Compared with the normal group,rats in the model group showed that a significantly longer escape latency time（P〈0.01） on the third and the fourth days;number of times crossing the platform in 70 s significantly reduced（P〈0.01）;activity times in the fourth quadrant significantly decreased（P〈0.05）;serum corticosterone levels increased（P〈0.01）;thymus GR expression decreased（P〈0.05）.Compared with the model group,rats in the moxibustion group showed that the escape latency times were significantly shorter on the third,the fourth and the fifth days（P〈0.01,P〈0.05）;number of times crossing the platform in 70 s significantly increased（P〈0.05）;activity times in the fourth quadrant significantly increased（P〈0.05）;serum corticosterone levels decreased（P〈0.05）;thymus GR expression increased（P〈0.05）.Conclusion：Moxibustion could improve the learning and m
