血小板衍生生长因子致大鼠血管的收缩作用

目的：观察血小板衍生生长因子-BB (PDGF-BB) 对大鼠主动脉血管环的收缩作用。 方法： 采用离体灌流SD大鼠胸主动脉血管环标本，观察不同浓度的PDGF-BB对其收缩作用，与去甲肾上腺素对比，并观察异搏定、吲哚美辛、酚妥拉明和普萘洛尔等药物对PDGF-BB缩血管作用的影响。 结果： PDGF-BB对大鼠胸主动脉有明显的收缩作用，阈浓度为2×10-10 mol/L，且呈现出浓度效应关系；与去甲肾上腺素相比，PDGF-BB对血管的收缩幅度低于去甲肾上腺素，但其收缩血管的活性高于去甲肾上腺素。吲哚美辛、酚妥拉明对PDGF-BB的收缩血管反应无明显影响，异搏定及普萘洛尔可明显抑制PDGF-BB的收缩血管反应。 结论： PDGF-BB对大鼠胸主动脉有明显的收缩作用，且呈现浓度效应关系，异搏定及普萘洛尔可抑制PDGF-BB的收缩反应。

Effects of platelet-derived growth factor on vasoconstriction of the vascular vessels in rats

AIM: To investigate the effects of platelet-derived growth factor BB (PDGF-BB) on vasoconstriction of the vascular vessels. METHODS: The contractile effects of PDGF-BB at different concentrations on the rat thoracic aortic rings and the effects of verapimil, indomerthacin, phentolamine and propranolol on the response of the thoracic aortic rings were observed by using the technique of vascular perfusion in vitro, and norepinephrine was used to severe as control. RESULTS: PDGF-BB showed a remarkable contractile effect on the thoracic aorta rings of rats in a dose-dependent manner, more potent than norepinephrine at the same molar concentration. Verapimil and propranolol inhibited the contractile effect of PDGF-BB on the rat thoracic rings, but the effect of indomerthacin and phentolamine on the vasoconstriction of PDGF-BB was not observed. CONCLUSION: PDGF-BB significantly contracts the thoracic aorta rings of rats in dose-dependent and non-endothelium-dependent manners. Verapimil and propranolol inhibits the contractile effect of PDGF-BB on the rat thoracic rings.