Hydrogen sulfide (H 2S) may be endogenously produced by cystathionine β lyase (CBS) and cystathionine γ lyase (CSE) as a cardiovascular physiological functional factor. On the hypoxic pulmonary hypertension (HPH) animal model, the plasma H 2S concentration, the gene expression and the activity (CSE) were decreased in lung tissues In L -NAME induced hypertension and spontaneous hypertension rats (SHR) models, the plasma H 2S concentration, vascular CSE activity and mRNA expression were obviously decreased. When H 2S was exogenously supplied, systolic pressure obviously decrease. These studies suggested that CSE/H 2S pathway participated in the pathophysiological development of hypertension. The endogenous level of H 2S produced by some arterial tissues increased in both septic and endotoxic shock rats. The level of H 2S highly correlated with the endogenous level of NO These results suggest that H 2S may be a novel cardiovascular functional regulator.
目的以自发性高血压(SHR)大鼠为对象,研究硫化氢(H2S)对血管中胶原堆积的影响。方法SHR大鼠17只,随机分为SHR组(n=6),SHR+H2S(n=6)组和SHR+PPG组(n=5)。WKY大鼠5只为对照组(n=5)。SHR+H2S组每日腹腔注射0.25 mL H2S供体NaHS(56μmol/kg),SHR+PPG组每日腹腔注射0.25 mL PPG(37.5 mg/Kg),连续用药5周。WKY对照组及SHR组注射等量注射用水。连续混合喂养5周后测定动脉血压;以胸主动脉组织为对象,用酶促反应法测定CSE活性;用高温裂解法测定羟脯氨酸含量。用酶联免疫法(ELISA)测定Ⅰ型胶原含量。用免疫组化法检测转化生长因子β3(TGF-β3)表达。结果与WKY对照组相比,SHR组大鼠血压升高52%(P<0.01);CSE酶活性降低55%(P<0.01);羟脯氨酸含量增加87%(P<0.01);Ⅰ型胶原含量增加28%;TGF-β3表达增加10%(P<0.05)。给予H2S后缓解了上述指标的变化。结论给SHR大鼠补充外源性H2S能够降低动脉血压,而且使主动脉组织中羟脯氨酸和Ⅰ型胶原含量减少,从而改善SHR大鼠血管中胶原的堆积。
