硫化氢对大鼠实验性肝硬化门静脉压力的影响

目的应用内源性硫化氢（H2S）供体硫氢化钠（NaHS）探讨内源性H2S/胱硫醚-γ-裂解酶（CSE）体系对大鼠肝硬化门静脉压力的影响。方法将32只健康雌性SD大鼠随机分为4组：C组和C＋S组采用复合因素法复制肝硬化模型。模型制备52 d后,N＋S组和C＋S组大鼠腹腔注射NaHS 56μmol/（kg.d）,N组和C组腹腔注射同等剂量的生理盐水。1周后分别测定各组大鼠门静脉压力（PVP）及门静脉血浆中H2S含量;采用免疫组织化学方法检测大鼠肝门区门静脉平滑肌细胞中CSE蛋白表达。结果与N组和N＋S组相比,C组和C＋S组PVP均升高,H2S含量及CSE蛋白表达均降低;与C组相比,C＋S组PVP降低,H2S含量及CSE蛋白表达均升高。结论 NaHS作为H2S供体可能具有改善肝硬化大鼠门脉高压的作用,其机制可能与H2S含量及CSE蛋白表达升高有关。  

Hydrogen sulfide as a novel biomarker of asthma and chronic obstructive pulmonary disease

Hydrogen sulfide (H₂S) has recently been recognised as the third important gas-signalling molecule, besides nitric oxide and carbon monoxide. H₂S has been reported to be produced by many cell types in mammalian tissues and organs throughout the actions of H₂S-generating enzymes or redox reactions between the oxidation of glucose and element of sulfur. Although the pathological role of H₂S has not yet been fully elucidated, accumulative data suggest that H₂S may have biphasic effects. Briefly, it mainly has anti-inflammatory and antioxidant roles, although it can also have pro-inflammatory effects under certain conditions where rapid release of H₂S in tissues occur, such as sepsis. To date, there have been several clinical studies published on H₂S in respiratory disorders, including asthma and chronic obstructive pulmonary disease (COPD). According to previous studies, H₂S is detectable in serum, sputum, and exhaled breath, although a gold standard method for detection has not yet been established. In asthma and COPD, H₂S levels in serum and sputum can vary depending on the underlying conditions such as an acute exacerbation. Furthermore, sputum H₂S in particular correlates with sputum neutrophils and the degree of airflow limitation, indicating that H₂S has potential as a novel promising biomarker for neutrophilic airway inflammation for predicting current control state as well as future risks of asthma. In the future, concurrent measures of H₂S with conventional inflammatory biomarkers (fractional exhaled nitric oxide, eosinophils etc) may provide more useful information regarding the identification of inflammatory phenotypes of asthma and COPD for personalised treatment.  

硫化氢供体对低氧大鼠肺动脉平滑肌细胞小窝蛋白的影响

目的 探讨硫化氢供体硫氢化钠（NaHS）对低氧大鼠肺动脉平滑肌细胞小窝蛋白1（Cav-1）的影响。方法 采用间断常压低氧法建立低氧大鼠模型。利用混合气体培养法制备大鼠低氧肺动脉平滑肌细胞模型。将32只SD大鼠随机分为4组（每组8只）：常氧组、低氧组、常氧＋NaHS组和低氧＋NaHS组。免疫组织化学方法检测肺小动脉中膜厚度、肌化及增殖程度。采用荧光探针法检测活性氧（ROS）含量。蛋白免疫印迹法检测Cav-1的表达。结果 低氧组大鼠右心室收缩压、右心室质量指数、肺小动脉中膜厚度、肌化及平滑肌增殖程度明显增加；低氧组大鼠肺动脉平滑肌细胞ROS产生增加及Cav-1表达降低；NaHS给予大鼠可改善肺动脉血流，缓解肺动脉中膜增厚，抑制肺动脉平滑肌细胞增殖，减少肺动脉平滑肌细胞ROS产生及增加Cav-1表达。结论 NaHS可通过降低低氧大鼠肺动脉平滑肌细胞ROS产生，上调Cav-1表达，抑制肺动脉平滑肌细胞增殖，缓解肺动脉重构。