Objective To study the effect of vasocation intestinal peptide （VIP） on immune privilege of the rat testis. Methods The UU infected SD rats and Leydig cells were intervened by VIP, the secretion of TGF-β and the ex...Objective To study the effect of vasocation intestinal peptide （VIP） on immune privilege of the rat testis. Methods The UU infected SD rats and Leydig cells were intervened by VIP, the secretion of TGF-β and the expression of FasL in rat Leydig cells were compared between VIP-intervened group and control group to test the effect of VIP on immune privilege of the rat testis in vitro and in vivo. Results In vitro, the secretion of TGF-β in Leydig cells could be increased by low dosage of VIP while inhibitited by high dosage of VIP; expression of FasL mRNA in Leydig cells could be decreased by VIP In vivo, increased expression of TGF-β mRNA and decreased FasL mRNA were observed in VIP group in 2-3 weeks after infected by UU. In addition, the apoptosis of Jurkat cells mediated by Leydig cells could be prevented by VIP Conclusion When Leydig cells or testis infected by UU, VIP could regulate the immune function of rat Leydig cells and participate in the regulation of immune privilege of testis through the regulation of TGF-β secretion and FasL expression pattern of Leydig cells.展开更多
Vasoactive intestinal peptide (VIP) is a 28-amino acid polypeptide first isolated from swine duodenum. VIP is a neurotransmitter that is extensively distributed in tissues. According to published reports, VPAC1 and VP...Vasoactive intestinal peptide (VIP) is a 28-amino acid polypeptide first isolated from swine duodenum. VIP is a neurotransmitter that is extensively distributed in tissues. According to published reports, VPAC1 and VPAC2 act as VIP receptors and are widely present in the central nervous system and peripheral tissues. VIP exerts diverse actions on the cardiovascular system, pancreas, digestive tract, respiratory system, and urological system. Recent reports indicated that VIP has immunological and neuroprotective effects and also affects cell growth. While primary investigations for developing therapeutic applications for various pathological conditions and diseases are underway, the structure and function of VIP should be analyzed in more detail.展开更多
In the present study, the effects of VIP on the growth of two human pancreatic carcinoma cell lines PU-PAN-l and PANC-I were determined using tritiated thymidine incorporation. VIP receptors. intracellular cAMP and po...In the present study, the effects of VIP on the growth of two human pancreatic carcinoma cell lines PU-PAN-l and PANC-I were determined using tritiated thymidine incorporation. VIP receptors. intracellular cAMP and polyamines were investigated. The results indicated that VIP at a concentration of 10-8 mol/L to 10-7 mol/L can significantly stimulate the growth of PU-PAN-I cells but not PANC-1 cells. This effect is dose-dependent and abolished by VIP receptor antagonist, [4-C1-Phe6 . Leu17] VIP, suggesting VIP receptors in PU-PAN-I cells may mediate this effect. VIP can markedly elevate the levels of intracellular cAMP and polyamines in PU-PAN-I cells.indicating that the growth-promoting effect stimulated by VIP may be via a rapid increase in the biosyntheses of cAMP and polyamines. In addition, the VIP-antibody inhibited the growth of PU-PAN-I cells in serum-free culture mediurn. The results above suggested that VIP has an autocrine regulatory effect on this pancreatic carcinoma cell line (PU-PAN-1).展开更多
目的:观察血管活性肠肽(vasoactive intestinal peptide,VIP)对便秘大鼠肠道水液代谢、环磷酸腺苷-蛋白激酶A信号通路(cyclic AMP protein kinase A signaling pathway,c AMP-PKA)和水通道蛋白3(water channel protein 3,AQP3)的影响,探...目的:观察血管活性肠肽(vasoactive intestinal peptide,VIP)对便秘大鼠肠道水液代谢、环磷酸腺苷-蛋白激酶A信号通路(cyclic AMP protein kinase A signaling pathway,c AMP-PKA)和水通道蛋白3(water channel protein 3,AQP3)的影响,探讨VIP治疗便秘的作用及机制。方法:45只健康成年Sprague-Dawley大鼠随机分为空白对照组、模型组、模型+VIP组。给药4周后,墨汁灌胃法检测大鼠首粒黑便排出时间;根据大鼠粪便干湿重计算粪便含水率;HE染色观察各组大鼠结肠组织形态学变化;Western印迹检测各组大鼠结肠组织中VIP和AQP3蛋白表达水平;定量即时聚合酶链锁反应(quantitative real time polymerase chain reaction,q PCR)检测各组大鼠结肠组织中c AMP,PKA和AQP3 m RNA的表达水平。结果:与空白对照组比较,模型组大鼠首粒黑便出现时间延长,粪便含水率明显减少(均P<0.01);结肠黏膜上皮部分破坏,杯状细胞体积减小,数量明显减少;结肠组织中VIP和AQP3蛋白含量明显减少,AQP3,c AMP和PKA m RNA相对表达水平均有所降低(均P<0.05)。与模型组比较,模型+VIP组大鼠首粒黑便出现时间缩短,粪便含水率明显增加(均P<0.05);结肠黏膜上皮完整性明显改善,杯状细胞体积增大,数量增多;结肠组织中VIP和AQP3蛋白含量增多,CAMP,PKA和AQP3 m RNA相对表达水平升高(均P<0.05)。结论:VIP静脉注射能够调节肠道水液代谢,改善大鼠便秘症状,其机制可能与调节VIP-c AMP-PKA-AQP3信号通路有关。展开更多
基金This study was supported by Shanghai Education Committee Science and Research Funds (04BB21)
文摘Objective To study the effect of vasocation intestinal peptide （VIP） on immune privilege of the rat testis. Methods The UU infected SD rats and Leydig cells were intervened by VIP, the secretion of TGF-β and the expression of FasL in rat Leydig cells were compared between VIP-intervened group and control group to test the effect of VIP on immune privilege of the rat testis in vitro and in vivo. Results In vitro, the secretion of TGF-β in Leydig cells could be increased by low dosage of VIP while inhibitited by high dosage of VIP; expression of FasL mRNA in Leydig cells could be decreased by VIP In vivo, increased expression of TGF-β mRNA and decreased FasL mRNA were observed in VIP group in 2-3 weeks after infected by UU. In addition, the apoptosis of Jurkat cells mediated by Leydig cells could be prevented by VIP Conclusion When Leydig cells or testis infected by UU, VIP could regulate the immune function of rat Leydig cells and participate in the regulation of immune privilege of testis through the regulation of TGF-β secretion and FasL expression pattern of Leydig cells.
文摘Vasoactive intestinal peptide (VIP) is a 28-amino acid polypeptide first isolated from swine duodenum. VIP is a neurotransmitter that is extensively distributed in tissues. According to published reports, VPAC1 and VPAC2 act as VIP receptors and are widely present in the central nervous system and peripheral tissues. VIP exerts diverse actions on the cardiovascular system, pancreas, digestive tract, respiratory system, and urological system. Recent reports indicated that VIP has immunological and neuroprotective effects and also affects cell growth. While primary investigations for developing therapeutic applications for various pathological conditions and diseases are underway, the structure and function of VIP should be analyzed in more detail.
文摘In the present study, the effects of VIP on the growth of two human pancreatic carcinoma cell lines PU-PAN-l and PANC-I were determined using tritiated thymidine incorporation. VIP receptors. intracellular cAMP and polyamines were investigated. The results indicated that VIP at a concentration of 10-8 mol/L to 10-7 mol/L can significantly stimulate the growth of PU-PAN-I cells but not PANC-1 cells. This effect is dose-dependent and abolished by VIP receptor antagonist, [4-C1-Phe6 . Leu17] VIP, suggesting VIP receptors in PU-PAN-I cells may mediate this effect. VIP can markedly elevate the levels of intracellular cAMP and polyamines in PU-PAN-I cells.indicating that the growth-promoting effect stimulated by VIP may be via a rapid increase in the biosyntheses of cAMP and polyamines. In addition, the VIP-antibody inhibited the growth of PU-PAN-I cells in serum-free culture mediurn. The results above suggested that VIP has an autocrine regulatory effect on this pancreatic carcinoma cell line (PU-PAN-1).
文摘目的:观察血管活性肠肽(vasoactive intestinal peptide,VIP)对便秘大鼠肠道水液代谢、环磷酸腺苷-蛋白激酶A信号通路(cyclic AMP protein kinase A signaling pathway,c AMP-PKA)和水通道蛋白3(water channel protein 3,AQP3)的影响,探讨VIP治疗便秘的作用及机制。方法:45只健康成年Sprague-Dawley大鼠随机分为空白对照组、模型组、模型+VIP组。给药4周后,墨汁灌胃法检测大鼠首粒黑便排出时间;根据大鼠粪便干湿重计算粪便含水率;HE染色观察各组大鼠结肠组织形态学变化;Western印迹检测各组大鼠结肠组织中VIP和AQP3蛋白表达水平;定量即时聚合酶链锁反应(quantitative real time polymerase chain reaction,q PCR)检测各组大鼠结肠组织中c AMP,PKA和AQP3 m RNA的表达水平。结果:与空白对照组比较,模型组大鼠首粒黑便出现时间延长,粪便含水率明显减少(均P<0.01);结肠黏膜上皮部分破坏,杯状细胞体积减小,数量明显减少;结肠组织中VIP和AQP3蛋白含量明显减少,AQP3,c AMP和PKA m RNA相对表达水平均有所降低(均P<0.05)。与模型组比较,模型+VIP组大鼠首粒黑便出现时间缩短,粪便含水率明显增加(均P<0.05);结肠黏膜上皮完整性明显改善,杯状细胞体积增大,数量增多;结肠组织中VIP和AQP3蛋白含量增多,CAMP,PKA和AQP3 m RNA相对表达水平升高(均P<0.05)。结论:VIP静脉注射能够调节肠道水液代谢,改善大鼠便秘症状,其机制可能与调节VIP-c AMP-PKA-AQP3信号通路有关。
