Objective To screen and identify differentially expressed genes in the dorsal root ganglion （DRG） in early experimental diabetic rats. Methods Diabetic model rats were induced by single intraperitoneal injection of ...Objective To screen and identify differentially expressed genes in the dorsal root ganglion （DRG） in early experimental diabetic rats. Methods Diabetic model rats were induced by single intraperitoneal injection of streptozotocin （STZ）. At the second week after STZ injection, the sensory nerve conduction velocities （SNCV） of sciatic nerve were measured as an indicator of neuropathy. The technique of silver-staining mRNA differential display polymerase chain reaction （DD-PCR） was used to detect the levels of differentially expressed genes in rat DRG. The cDNA fragments that displayed differentially were identified by reverse-hybridization, cloned and sequenced subsequently, and then confirmed by Northern blot. Results The SNCV in the diabetic model group [n = 9, （45.25±10.38） m/s] reduced obviously compared with the control group [n = 8, （60.10± 11.92） m/s] （P 〈 0.05）. Seven distinct cDNA clones, one was up-regulated gene and the others were downregulated ones, were isolated by silver-staining mRNA differential display method and confirmed by Northern blot. According to the results of sequence alignment with GenBank data, majority of the clones had no significant sequence similarity to previously reported genes except only one that showed high homology to 6-pyruvoyl-tetrahydropterin synthase mRNA （accession No., BC059140）, which had not been reported to relate to diabetic neuropathy. Conclusion These differentially expressed genes in the diabetic DRG may contribute to the pathogenesis of diabetic peripheral neuropathy.展开更多
目的采用电生理记录和行为学观察研究了外周初级传入神经元对单独和联合使用ATP及缓激肽(BK)的反应及其机制。方法在大鼠新鲜分离背根神经节(DRG)神经元标本上应用全细胞膜片钳技术记录ATP激活电流(I_(ATP))以及BK对I_(ATP)的调制作用,...目的采用电生理记录和行为学观察研究了外周初级传入神经元对单独和联合使用ATP及缓激肽(BK)的反应及其机制。方法在大鼠新鲜分离背根神经节(DRG)神经元标本上应用全细胞膜片钳技术记录ATP激活电流(I_(ATP))以及BK对I_(ATP)的调制作用,并结合痛行为实验进行整体行为观察。结果在大鼠新鲜分离的DRG细胞上预加BK后再加ATP,则I_(ATP)明显增强,其增强程度依赖于BK的浓度(10^(-6)～10^(-4) mol/L)。预加BK后ATP的量—效曲线上移,其电流最大值与对照相比增加20.75%,而BK预加前后ATP量—效曲线的EC_(50)值非常接近(1.65×10^(-5)(?) 2.0×10^(-5)mol/L)。在大鼠后肢掌底皮下分别注射BK和ATP均引起浓度依赖性的痛行为(抬腿)反应.当联合应用BK(10^(-6)mol/L)和ATP(10^(-5),10^(-4) and 10^(-3)mol/L)时,后爪抬腿时间随ATP浓度的增大而急剧地增强。结论炎性介质BK、ATP等在外周感觉神经来梢疼痛信息的产生、传递和调制方面起着重要的作用。ATP和BK具有协同作用,这种作用是非竞争性的,BK能明显增强I_(ATP)预加BK后,随着ATP浓度的增高所诱导的痛行为反应急剧增加。展开更多
基金the grant from Technical Program of Social Development ofNantong Municipality (No.S30043)the Natural ScienceFoundation of Nantong University (No. 05Z084)
文摘Objective To screen and identify differentially expressed genes in the dorsal root ganglion （DRG） in early experimental diabetic rats. Methods Diabetic model rats were induced by single intraperitoneal injection of streptozotocin （STZ）. At the second week after STZ injection, the sensory nerve conduction velocities （SNCV） of sciatic nerve were measured as an indicator of neuropathy. The technique of silver-staining mRNA differential display polymerase chain reaction （DD-PCR） was used to detect the levels of differentially expressed genes in rat DRG. The cDNA fragments that displayed differentially were identified by reverse-hybridization, cloned and sequenced subsequently, and then confirmed by Northern blot. Results The SNCV in the diabetic model group [n = 9, （45.25±10.38） m/s] reduced obviously compared with the control group [n = 8, （60.10± 11.92） m/s] （P 〈 0.05）. Seven distinct cDNA clones, one was up-regulated gene and the others were downregulated ones, were isolated by silver-staining mRNA differential display method and confirmed by Northern blot. According to the results of sequence alignment with GenBank data, majority of the clones had no significant sequence similarity to previously reported genes except only one that showed high homology to 6-pyruvoyl-tetrahydropterin synthase mRNA （accession No., BC059140）, which had not been reported to relate to diabetic neuropathy. Conclusion These differentially expressed genes in the diabetic DRG may contribute to the pathogenesis of diabetic peripheral neuropathy.
文摘目的采用电生理记录和行为学观察研究了外周初级传入神经元对单独和联合使用ATP及缓激肽(BK)的反应及其机制。方法在大鼠新鲜分离背根神经节(DRG)神经元标本上应用全细胞膜片钳技术记录ATP激活电流(I_(ATP))以及BK对I_(ATP)的调制作用,并结合痛行为实验进行整体行为观察。结果在大鼠新鲜分离的DRG细胞上预加BK后再加ATP,则I_(ATP)明显增强,其增强程度依赖于BK的浓度(10^(-6)～10^(-4) mol/L)。预加BK后ATP的量—效曲线上移,其电流最大值与对照相比增加20.75%,而BK预加前后ATP量—效曲线的EC_(50)值非常接近(1.65×10^(-5)(?) 2.0×10^(-5)mol/L)。在大鼠后肢掌底皮下分别注射BK和ATP均引起浓度依赖性的痛行为(抬腿)反应.当联合应用BK(10^(-6)mol/L)和ATP(10^(-5),10^(-4) and 10^(-3)mol/L)时,后爪抬腿时间随ATP浓度的增大而急剧地增强。结论炎性介质BK、ATP等在外周感觉神经来梢疼痛信息的产生、传递和调制方面起着重要的作用。ATP和BK具有协同作用,这种作用是非竞争性的,BK能明显增强I_(ATP)预加BK后,随着ATP浓度的增高所诱导的痛行为反应急剧增加。
