Objective: To investigate the changes in CREB (cAMP response element binding protein) in hippocampus, PFC (prefrontal cortex) and NAc (nucleus accumbens) during three phases of morphine induced CPP (conditioned place ...Objective: To investigate the changes in CREB (cAMP response element binding protein) in hippocampus, PFC (prefrontal cortex) and NAc (nucleus accumbens) during three phases of morphine induced CPP (conditioned place preference) in rats, and to elucidate the role of CREB during the progress of conditioned place preference. Methods: Morphine induced CPP acquisition, extinction and drug primed reinstatement model was established, and CREB expression in each brain area was measured by Western Blot methods. Results: Eight alternating injections of morphine (10 mg/kg) induced CPP, and 8 d saline extinction training that extinguished CPP. CPP was reinstated following a priming injection of morphine (2.5 mg/kg). During the phases of CPP acquisition and reinstatement, the level of CREB expression was significantly changed in different brain areas. Conclusion: It was proved that CPP model can be used as an effective tool to investigate the mechanisms underlying drug-induced reinstatement of drug seeking after extinction, and that morphine induced CPP and drug primed reinstatement may involve acti-vation of the transcription factor CREB in several brain areas, suggesting that the CREB and its target gene regulation pathway may mediate the basic mechanism underlying opioid dependence and its drug seeking behavior.展开更多
[目的]通过检测黄连素对三阴乳腺癌(triple-negative breast cancer,TNBC)细胞株MDA-MB-231细胞凋亡及葡萄糖调节蛋白78(glucose regulated protein 78,GRP78)表达的影响,探讨黄连素抗TNBC的机制。[方法]以MTT法检测不同浓度黄连素对MDA...[目的]通过检测黄连素对三阴乳腺癌(triple-negative breast cancer,TNBC)细胞株MDA-MB-231细胞凋亡及葡萄糖调节蛋白78(glucose regulated protein 78,GRP78)表达的影响,探讨黄连素抗TNBC的机制。[方法]以MTT法检测不同浓度黄连素对MDA-MB-231细胞增殖的影响,筛选黄连素的处理浓度。将MDA-MB-231细胞分为对照组、40μmol·L^(-1)黄连素组、60μmol·L^(-1)黄连素组、免疫球蛋白重链结合蛋白诱导剂X(immunoglobulin heavy chain binding protein inducer X,BiX)组,以及BiX联合40μmol·L^(-1)黄连素组、BiX联合60μmol·L^(-1)黄连素组。相应药物处理24h后,应用流式细胞术检测细胞凋亡情况,并以Western blot检测细胞GRP78和凋亡相关基因Bcl-2、Bax的表达。[结果]40μmol·L^(-1)以上浓度的黄连素可剂量依赖性抑制MDA-MB-231细胞增殖。与对照组比较,BiX组细胞凋亡率降低(P<0.05)、GRP78和Bcl-2表达增高(P<0.01,P<0.001)、Bax表达减低(P<0.05)。与BiX组比较,BiX联合40、60μmol·L^(-1)黄连素组细胞凋亡率增加(P<0.01),GRP78和Bcl-2表达减低(P<0.01,P<0.01),Bax表达增加(P<0.01)。[结论]黄连素可以促进MDA-MB-231细胞凋亡,其机制可能是通过下调GRP78的表达,从而降低Bcl-2表达,并促进Bax的表达。展开更多
文摘Objective: To investigate the changes in CREB (cAMP response element binding protein) in hippocampus, PFC (prefrontal cortex) and NAc (nucleus accumbens) during three phases of morphine induced CPP (conditioned place preference) in rats, and to elucidate the role of CREB during the progress of conditioned place preference. Methods: Morphine induced CPP acquisition, extinction and drug primed reinstatement model was established, and CREB expression in each brain area was measured by Western Blot methods. Results: Eight alternating injections of morphine (10 mg/kg) induced CPP, and 8 d saline extinction training that extinguished CPP. CPP was reinstated following a priming injection of morphine (2.5 mg/kg). During the phases of CPP acquisition and reinstatement, the level of CREB expression was significantly changed in different brain areas. Conclusion: It was proved that CPP model can be used as an effective tool to investigate the mechanisms underlying drug-induced reinstatement of drug seeking after extinction, and that morphine induced CPP and drug primed reinstatement may involve acti-vation of the transcription factor CREB in several brain areas, suggesting that the CREB and its target gene regulation pathway may mediate the basic mechanism underlying opioid dependence and its drug seeking behavior.
文摘[目的]通过检测黄连素对三阴乳腺癌(triple-negative breast cancer,TNBC)细胞株MDA-MB-231细胞凋亡及葡萄糖调节蛋白78(glucose regulated protein 78,GRP78)表达的影响,探讨黄连素抗TNBC的机制。[方法]以MTT法检测不同浓度黄连素对MDA-MB-231细胞增殖的影响,筛选黄连素的处理浓度。将MDA-MB-231细胞分为对照组、40μmol·L^(-1)黄连素组、60μmol·L^(-1)黄连素组、免疫球蛋白重链结合蛋白诱导剂X(immunoglobulin heavy chain binding protein inducer X,BiX)组,以及BiX联合40μmol·L^(-1)黄连素组、BiX联合60μmol·L^(-1)黄连素组。相应药物处理24h后,应用流式细胞术检测细胞凋亡情况,并以Western blot检测细胞GRP78和凋亡相关基因Bcl-2、Bax的表达。[结果]40μmol·L^(-1)以上浓度的黄连素可剂量依赖性抑制MDA-MB-231细胞增殖。与对照组比较,BiX组细胞凋亡率降低(P<0.05)、GRP78和Bcl-2表达增高(P<0.01,P<0.001)、Bax表达减低(P<0.05)。与BiX组比较,BiX联合40、60μmol·L^(-1)黄连素组细胞凋亡率增加(P<0.01),GRP78和Bcl-2表达减低(P<0.01,P<0.01),Bax表达增加(P<0.01)。[结论]黄连素可以促进MDA-MB-231细胞凋亡,其机制可能是通过下调GRP78的表达,从而降低Bcl-2表达,并促进Bax的表达。
