牛磺酸調(diào)節(jié)cAMP-PKA-CREB信號通路活性促進生長受限胎鼠神經(jīng)干細胞增殖的體內(nèi)外實驗研究
[Abstract]:Background: intrauterine growth restriction (IUGR) refers to the fact that the fetal growth in the uterus is restricted due to various factors, and the birth weight is significantly lower than normal. Many pathological factors such as mother, fetus and placenta can lead to the occurrence of IUGR. IUGR can cause multiple organ function involvement, especially the adverse effects on brain development, which seriously affect long-term nerve function. Taurine plays an important role in brain development, but the body itself is less synthesised. Fetus relies on placental transport to obtain sufficient taurine. Our previous experimental study showed that the supplementation of taurine could improve the brain development of IUGR, such as improving the brain ultrastructure and increasing the number of nerve cells. These effects may be achieved by regulating the activity of cAMP-PKA-CREB signaling pathway. Taurine can regulate the proliferation, survival and adhesion of neural stem cells (NSC), but the effect of taurine on the proliferation of NSC in IUGR fetal mice and its mechanism are not clear. Therefore, the effects of IUGR on the proliferation of fetal NSC, the effect of prenatal taurine supplementation on the proliferation of NSC of IUGR fetal mice and the possible mechanism of taurine regulating the proliferation of NSC of IUGR fetal mice were studied in this study. Methods: the IUGR model was established by the method of whole course restriction diet. The pregnant rats in the IUGR group were fed only 40% of the normal diet of the control group from the day of conception, and were divided into the control group and the IUGR group. The 300mg/kg/d taurine was added to the pregnant rats from the 7th day of gestation, and the body weight and brain weight were measured by natural delivery. The expression of NSC in brain tissue and the expression of cAMP-PKA-CREB signal pathway key factor (PKAcAMPCREBp-CREBp-CREBN-BDNFfosc-juncCaMK II) were detected by immunohistochemical staining. Fetal rat NSCs were isolated from control group and IUGR group in vitro. The expression of FABP-7 and nestin was detected by immunofluorescence cytochemical staining and the effect of taurine at different concentrations on the proliferation of NSC in IUGR fetal mice was detected by cell counting method. RT-PCR was used to detect the proliferation of NSC in IUGR fetal mice. The expression of key factors of cAMP-PKA-CREB signal pathway in each group was analyzed by SPSS 20.0 software after treatment with taurine and signal pathway inhibitor H89. Results: the neonatal and fetal rat models of IUGR could be established successfully by the method of diet restriction, and the incidence and mortality of IUGR were significantly decreased by taurine supplementation in pregnant rats, and the number of NSC in the fetal brain of rats with increased brain weight was significantly decreased in IUGR group. The number of NSC in IUGR group was significantly increased after supplementation of taurine (P0.05) the expression of key factors of cAMP-PKA-CREB signal pathway in IUGR fetal brain was significantly different from that in control group, and the expression of key factor in taurine group was significantly different from that in IUGR group. The difference was statistically significant (P0.05). The proliferation ability and cell number of NSC of IUGR fetal mice were significantly decreased, and the proliferation ability of NSC of IUGR fetal mice was significantly increased by taurine intervention in vitro. In addition, the expression of key factors of cAMP-PKA-CREB signaling pathway was inhibited and some factors were compensatory, which were significantly different from those of the control group (P0.05). The expression of related factors changed obviously after taurine intervention. The difference was statistically significant (P0.05). Conclusion the number of NSC in the brain of fetal mice with 1% IUGR decreased, and the number of NSC in fetal mice of IUGR increased after supplementation of taurine. Taurine could promote the proliferation of NSC of IUGR fetal mice in vitro. Taurine may increase the activity of cAMP-PKA-CREB signaling pathway to promote the proliferation of IUGR fetal NSC and improve brain development.
【學(xué)位授予單位】:南方醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:R714.5
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