左归降糖解郁方对糖尿病并发抑郁症大鼠海马血脑屏障精细结构AQP4、Cx43的影响

目的研究左归降糖解郁方(黄芪、贯叶连翘、姜黄、熟地黄、山茱萸等)对糖尿病并发抑郁症大鼠海马血脑屏障精细结构水通道蛋白AQP4和缝隙连接蛋白Cx43表达的影响。方法采用高脂乳剂灌胃、尾静脉注射链脲佐菌素、28 d慢性应激联合的方法复制糖尿病并发抑郁症大鼠模型,并随机分为5组:模型组,阳性药(二甲双胍+盐酸氟西汀)组,左归降糖解郁方高、中、低剂量组,以正常大鼠为空白组,灌胃给药4周。给药后,采用Morris水迷宫测试大鼠空间学习能力,HE染色法观察海马组织病理学,免疫组化法检测海马血脑屏障精细结构AQP4和Cx43表达情况。结果与空白组比较,模型组大鼠逃避潜伏期延长(P<0.01),海马细胞存在明显损伤,AQP4和Cx43表达下降,差异有统计学意义(P<0.05);与模型组比较,阳性药组和左归降糖解郁方高剂量组大鼠逃避潜伏期缩短,差异有显著统计学意义(P<0.01),海马细胞形态趋于正常,且AQP4和Cx43表达增多,差异有统计学意义(P<0.05)。结论左归降糖解郁方对糖尿病并发抑郁症大鼠的治疗作用可能与调控海马血脑屏障精细结构AQP4和Cx43表达有关。

SPECIFIC INHIBITION OF CONNEXIN 43 GENE EXPRESSION AFTER ACUPOINTS AND ACUPUNCTURE TREATMENT FOR PRIMARY DYSMENORRHEA

Objective To investigate the effect of acupuncture treatment on silencing the expression of Oonnexin 43 （Cx43）, and to study the analgesic mechanism of acupuncture treatment for primary dysmenorrhea （PD） in rats. Methods We used estrostilben to develop the model of primary dysmenorrhea in rat, and RNA interference technology to silence the expression of Cx43 in acupoints. Fifty female rats were randomly divided into five groups （n = 10 in each group） ： normal, model, acupuncture, acupuncture ＋ interference and acupuncture＋ interference control group, pSilencer-Cx43-shRNA and pSilencer-Oon-shRNA were injected locally into the acupoints in interference group and interference-control group, respectively. The incidence rate of writhe reaction over the period of 30 min was evaluated. The expression of the oxytocin receptor （OTR） and vasopressin receptor（VasR） in rat myometrium with Semiquantitative RT-POR and immunohistochemistry. Results （1）The mRNA and protein level of Cx43 in acupoints in interference group were significantly lower those of in the acupuncture group （P〈0.05）. There was no significant difference between acupuncture and interference-control group. （2） Acupuncture could significantly prolong the latency period of writhing body and decrease the number of writhing body as compared with that of model group and interference group. （3）The level of OTR and VasR mRNA and protein in the model group were significantly higher （P〈0.05） as compared to normal group. The results in acupuncture group and interference-control group were similar to the normal group. The results in interference group were similar to the model group. Conclusions Acupuncture may be useful in the treatment of the model of primary dysmenorrhea in the rats. Local injection of Cx43 shRNA expression vetor could silence the expression of Cx43 in acupoint and markedly influence acupuncture effect, demonstrating Cx43 is involved in acupuncture effect.

缺血后适应对非梗死相关动脉细胞凋亡及相关基因表达影响的研究

目的:观察缺血后适应对非梗死相关动脉组织细胞凋亡及其相关基因的影响。方法:制备兔高脂血症心肌缺血再灌注模型,实验动物随机分为三组(每组10只):A组:假手术组。B组:心肌缺血再灌注组。C组:心肌缺血后适应再灌注组。通过Tunel荧光染色和实时荧光定量PCR(qRT-PCR)检测比较各组非梗死相关动脉组织细胞凋亡程度以及血管紧张素II 1型受体(ATl)、缝隙连接蛋内43 (Cx43)、P微管蛋白((3-tubulin)等相关基因的差异。结果:心肌缺血再灌注1周后,非梗死相关动脉出现动脉粥样硬化斑块。非梗死相关动脉组织Timel荧光染色分析显示,与假手术组相比,急性心肌缺血再灌注组的凋亡细胞增加[(8.14±2.05)%vs.(46.11±5.92)%,P<0.001]。与急性心肌缺血再灌注组相比,急性心肌缺血后适应再灌注组的凋亡细胞减少[(46. 11±5. 92)%vs.(28. 36±9. 41)%,P<0. 001 ]。非梗死相关动脉组织qRT-PCR检测显示,与假手术组相比,急性心肌缺血再灌注组的[AT1( 1.002± 0.068)vs.(30.576±1.760),P<0.01]、CX43(1.009±0. 133)(15. 171±1.736),P<0.01)、p-tubulin 基因[(1.003±0.083)vs.(1.361±0.042),P<0.01]上调。与急性心肌缺血再灌注组相比,急性心肌缺血后适应再灌注组[AT1(30.576±1.760)vs.(4.697±0.227),P<0.01]、CX43(15.171±1.736)vs.(2.267± 0.312),P<0.01]、p-tubulin 基因下调[(1.36±0.042)vs.(1.083±0.098),P<0.01]。结论:心肌缺血再灌注1周后,非梗死相关动脉出现动脉粥样硬化斑块,伴随凋亡细胞增加和AT1、CX43、P-tubulin基因上调。缺血后适应可减少非梗死相关动脉凋亡细胞数量并可使AT1、CX43、P-tubulin基因下调,从而抑制非梗死相关动脉病变进展。

Yimu San improves obstetric ability of pregnant mice by increasing serum oxytocin levels and connexin 43 expression in uterine smooth muscle

Prolonged farrowing remains one of the critical challenges in intensive pig farming. This study aims to explore the effects and mechanism of Yimu San （YMS）, a Chinese veterinary medicine micro mist, on delivery ability with mouse models. Thirty-two pregnant mice were randomly divided into a control group and Iow-YMS, med-YMS, and high-YMS groups. The labor process time and stillbirth rate were recorded, the levels of serum oxytocin and prostaglandin E2 （PGE2） were measured with enzyme-linked immunosorbent assay （ELISA）. Contractility measure- ments of the isolated uterus and the expression of connexin 43 （Cx43） in uterine smooth muscle were evaluated. The results showed that compared with the control group, the birth process time and stillbirth rate in the med-YMS and high-YMS groups were remarkably lower. The in vitro uterine contractions, levels of oxytocin, PGE2, and Cx43 in the med-YMS and high-YMS groups were significantly higher than those in the control group. The differences of the above measurements between the Iow-YMS group and the control group were not obvious. It can be speculated that YMS could significantly promote labor in pregnant mice by enhancing the levels of oxytocin, Cx43, and PGE2.

福辛普利对高血压大鼠的心肌保护作用

目的:探讨高血压大鼠心肌组织中胰岛素样生长因子-1(IGF-1)和缝隙连接蛋白43(CX43)的表达,并运用福辛普利进行干预,研究其心肌保护作用。方法:32只健康雄性SD大鼠随机分为空白对照组(n=8)、假手术组(n=8)以及模型组(n=16),模型组以二肾一夹的方法建立,模型建立成功后,随机分为福辛普利治疗组(n=8)和模型对照组(n=8)。治疗组给予福辛普利按照10mg/(kg·d)剂量灌胃,空白对照组、假手术组以及模型对照组给予相同体积的生理盐水灌胃,每日1次。给药8周后,麻醉处死动物,称体重(BW)、心脏(HW)和左心室(含室间隔LVW)重量,计算HW/BW为心脏指数(mg/g),LVW/BW为左心室指数(mg/g),SP免疫组化法检测心室肌组织中IGF-1、缝隙连接蛋白43(CX43)的表达。结果:与空白对照组相比,假手术组血压、心脏指数、左心室指数、IGF-1蛋白表达率、CX43含量变化不明显,模型组则明显升高(P<0.05);与模型对照组相比,福辛普利治疗组上述指标则改善明显(P<0.05)。结论:肾血管性高血压大鼠心室肌组织IGF-1蛋白表达增多,CX43蛋白表达增多,心脏指数及左心室指数增大,运用血管紧张素转换酶抑制剂福辛普利干预后,IGF-1蛋白表达率、CX43蛋白表达减少,心功能有所改善,提示福辛普利可能通过抑制IGF-1表达、降低CX43表达来改善心功能。