约束应激对大鼠5-HT_(1A)和5-HT_(2A)受体表达的影响

Objective:To explore the 5-HT mechanism of stress . Methods:The method of polymerase chain reaction (PCR) was used to detect the presence of 5-HT receptor subtypes in the hippocampus,hypothalamic and midbrain of the rat after 30days of movement restrict compared with normal cage control groups (CC) . The specific oligonucleotide primers were synthesized based on the complementary DNA sequence for each of the rat 5-HT 1A and 5-HT 2A receptor subtypes . Results : The expression of 5-HT 1A receptor subtypes in each regions of the rat brain after movement restrict were signifcantly lower than that of the CC groups, and the expression of 5-HT 2A receptor subtype were signifcantly higher( P <0.01-0.05).Conclusions : 5-HT 1A and 5-HT 2A receptors may be invovled in the stress of the rat and may have opposite effects with respect to certain functions.

骨髓造血干祖细胞改善慢性约束应激诱导的小鼠脾细胞数减少

目的观察CD34+骨髓造血干祖细胞(CD34+HSPC)对慢性约束应激小鼠脾细胞数的影响。方法将10只8周龄雄性BALB/c小鼠分为2组(n=5):①慢性应激组:小鼠放入约束应激管中约束12 h/d(早9:00-晚9:00),解除约束12 h/d(晚9:00-早9:00),连续处理3 d以建立慢性约束应激的小鼠模型;②对照组:正常饲养不施加任何处理。慢性应激第3天结束时即取每组小鼠脾并计数脾细胞。HSPC体内干预实验中,20只雄性BALB/c小鼠分为4组(n=5):HSPC干预+慢性应激组,溶剂对照+慢性应激组,HSPC干预组和溶剂对照组。HSPC干预+慢性应激组和溶剂对照+慢性应激组慢性应激第3天结束时即取每组小鼠脾并计数脾细胞,流式细胞术检测其中活细胞、凋亡细胞及坏死细胞比例。绿色荧光标记HSPC做体内示踪试验,检测迁移至脾的HSPC。HSPC体外干预实验中,细胞培养分为4组:HSPC干预+地塞米松组,脾细胞+地塞米松组,HSPC干预组和脾细胞单独培养组,培养18 h,流式细胞术检测其中活细胞、凋亡细胞及坏死细胞的比例。结果脾细胞计数结果表明,与对照组相比,慢性应激组小鼠的脾细胞总数显著减少(P<0.05)。HSPC体内干预实验中,与溶剂对照+慢性应激组相比,HSPC干预+慢性应激组小鼠脾细胞计数增加(P<0.05)。流式细胞术结果表明,与溶剂对照组相比,溶剂对照+慢性应激组小鼠脾细胞凋亡及坏死比例增加(P<0.05);与溶剂对照+慢性应激组相比,HSPC干预+慢性应激组小鼠脾细胞凋亡比例减少,活细胞比例增加(P<0.05)。体内示踪试验结果显示,慢性应激过程中HSPC可迁移至脾中。体外实验结果表明,与脾细胞单独培养组相比,脾细胞+地塞米松组脾细胞凋亡及坏死比例增加(P<0.05);与脾细胞+地塞米松组相比,HSPC干预+地塞米松组脾细胞坏死比例减少,活细胞比例增加(P<0.05)。结论CD34+HSPC可改善慢性约束应激诱导的小鼠脾细胞数的减少。