α硫辛酸通过激活AMP活化的蛋白激酶防止肥胖大鼠内皮功能障碍

血管内皮细胞脂质蓄积在肥胖者动脉粥样硬化的发病机理中起重要作用。我们以前的研究发现,α硫辛酸能激活AMP活化的蛋白激酶,减少肥胖大鼠骨骼肌细胞中脂质蓄积。为了观察α硫辛酸是否通过激活内皮细胞AMP活化的蛋白激酶来改善内皮功能障碍。我们用肥胖大鼠和对照大鼠做实验,观察给予α硫辛酸前后这两组大鼠的内皮依赖性血管舒张功能和内皮细胞凋亡情况。结果发现,肥胖大鼠的内皮依赖性血管舒张功能受损程度和主动脉内皮细胞凋亡数都较对照组高;甘油三酯和脂过氧化物水平也较对照组高,而一氧化氮复合物较对照组低。给予α硫辛酸后,肥胖大…     

丝裂素活化蛋白激酶介导神经肽Y促心肌细胞肥大效应

目的 观察丝裂素活化蛋白激酶（mitogen-activated protein kinase，MAPK）在神经肽Y（neuropeptide Y，NPY）及去甲肾上腺素（NE）促心肌细胞肥大过程中的作用。方法 进行原代乳鼠心肌细胞培养，使用髓磷脂碱性蛋白为底物，γ-^32P-ATP为磷酸基来源，测定在NPY、NE作用过程中MAPK活性的变化。结果 NPY、NE作用后5min内，MAPK活性即有明显升高，在15min达高峰，25min后仍显著高于对照组（P〈0．01）；二者合用可使MAPK活性进一步增高（P〈0．01）。结论 作为一种快速、有力的信息传递工具，信息共同通路MAPK在NPY、NE生物学信息传导过程发挥了重要作用。     

大鼠延髓和脊髓背角内PKCγ阳性神经元向中缝大核的投射

目的 研究大鼠延髓背角和脊髓背角浅层内蛋白激酶Cγ亚单位（PKCγ）阳性神经元向中缝大核（NRM）的投射。方法 荧光金（FG）逆行追踪和PKCγ免疫荧光组织化学染色相结合的双标记方法。结果 将FG注入NRM，在延髓和脊髓背角的Ⅰ-Ⅲ层内可见FG逆标神经元；PKCγ阳性神经元主要分布于延髓和脊髓背角的Ⅱ层内侧部及Ⅱ、Ⅲ层交界处，Ⅰ、Ⅲ层内较少；延髓背角Ⅰ层和脊髓背角Ⅰ－Ⅲ层可观察到FG逆标并呈PKCγ阳性的双标神经元。结论 延髓和脊髓背角浅层向NRM投射的神经元含PKCγ，提示PKCγ在向NRM传递痛信息的通路中可能发挥重要作用。     

AMPK在妊娠期糖尿病发病机制中的作用

腺苷酸活化蛋白激酶是一种重要的蛋白激酶,主要作用是协调代谢和能量平衡.腺苷酸活化蛋白激酶被激活后,在增加骨骼肌对葡萄糖摄取、增强胰岛素敏感性、增加脂肪酸氧化以及调节基因转录等方面发挥重要作用.已经证实脂联素有调节糖脂代谢的作用,但其作用机制尚不十分清楚,很可能是通过腺苷酸活化蛋白激酶介导,对脂联素信号转导通路的研究将成为进一步理解脂联素作用的关键所在.而脂联素又是妊娠期糖尿病的预测因子,所以腺苷酸活化蛋白激酶逐渐成为对妊娠期糖尿病研究中的焦点.     

鞘内注射吗啡加可乐定对切口痛大鼠脊髓背角蛋白激酶A催化亚单位表达的影响

Objective To observe the effect of intrathecal clonidine plus morphine on expression of protein kinase A (PKA) catalytic subunit in the spinal dorsal horn in a rat model of incisional pain. Methods Eighty male Sprague-Dawley rats were divided randomly into five groups: sham group, control group, pre-incisional morphine 2.5 μg group, pro-incisional clonidine 5 μg group and preincisional morphine 2.5 μg plus clonidine 5 lag group (n=16). lntrathecal catheter and the model of incisional pain were pro-duced according to Yaksh and Brennan's described method respectively. Changes of pain behavior were assessed by mechanical with-drawal threshold (MWT) and thermal withdrawal latency(TWL). The expressions of PKA catalytic subunit in the spinal dorsal horn were assessed by immunohistochemical method and western blotting analysis. Results Compared with sham group, MWT and TWL in control group were decreased significantly at 2 h after incision (P<0.01) and the number of positive cells and protein expression of PKA catalytic subunit in the spinal dorsal horn were increased significantly in control group (P<0.01). Compared with control group, MWT and TWL in pre-incision morphine 2 μg plus clonidine 5 lag group were increased significantly at 2 h after incision (P<0.01) and the number of positive cells and protein expression of PKA catalytic subunit in the spinal dorsal horn were decreased significantly in pre-incision morphine 2 μg plus clonidine 5 μg group (P<0.01). However, MWT, TWL and the number of positive cells and pro-tein expression of PKA catalytic subunit in the spinal dorsal horn changed with no statistical significance in pre-incisional morphine 2.5 μg group and pre-incisional clonidine 5 μg group compared with control group. Conclusion lntrathecal clonidine significantly enhances the antinociceptive effect of intrathecal morphine in a rat model of incisional pain, which might be associated with inhibi-tion of the increased expression of PKA catalytic subunit in spinal cord.     

细胞周期调控蛋白与口腔癌相关性

本文对细胞周期调控蛋白作用机理以及在口腔癌发生中的意义作一综述。     

HER-2/neu原癌基因与人类癌症

HER－2／neu（C－erb－B－2）原癌基因编码185kD蛋白质，其结构与表皮生长因子受体（EGFR）具有广泛的同源性，也是具有酪氨酸蛋白淑游活性的持定生长因子的受体。HER－2／neu原癌基因可通过点突变扩增及过量表达激活，而且与多种人类病症的恶性有关，可以作为新的抗癌疗法的靶子。     

人酪氨酸羟化酶基因真核表达载体的构建及在哺乳动物细胞中的表达

用限制性内切酶EcoRI从pKS(-)HTH_1切下全长为1.9 kb的人酪氨酸羟化酶基因,在T_4DNA连接酶的作用下连接在真核表达载体pCDNA_3的EcoR Ⅰ位点,构建成重组质粒pcD-NA_3HTH_1,该质粒转染COS-7细胞,免疫荧光组织化学染色证实酪氨酸羟化酶在其中的表达。     

哺乳动物的促分裂原活化蛋白激酶信号途径

促分裂原活化蛋白激酶(MAPK)是一类表达于所有真核细胞的丝氨酸/苏氨酸激酶,能够被诸如细胞因子、生长因子、神经递质、激素、细胞应急以及细胞粘附等各种刺激因素激活.MAPK途径的基本组合包括MAPK、MAPK激酶(MKK)和MAPK激酶激酶(MKKK)三种保守的成分,由此建立一个连续的激活途径.哺乳动物的MAPK可以大致归纳为5类:ERK1/2(MAPKerk1/2)、P38(MAPKp3g)、JNK(MAPKjnk)、ERK3/4(MAPKerk3/4)和ERK5(MAPKerk5).MAPK家族在各种细胞活动中具有重要作用,如增殖、分化、发育、转化及凋亡等.文章讨论了哺乳动物MAPK的功能和调节.