【摘要】 目的 :探讨内源性一氧化碳 (CO)对低氧大鼠肺动脉胶原代谢的作用及其机制。方法 :采用常压低氧大鼠肺动脉高压模型 ,观察血红素氧合酶 (HO)抑制剂锌原卟啉 -Ⅸ (ZnPP -Ⅸ )对肺动脉平均压 (PAMP)和肺组织匀浆碳氧血红蛋白 (HbCO)含量的影响 ,并用免疫组织化学和核酸原位杂交法分别观察ZnPP -Ⅸ对肺动脉转化生长因子 - β3 (TGF - β3 )、Ⅰ型胶原蛋白的表达和肺动脉TGF - β3 mRNA、Ⅰ型前胶原mRNA和金属蛋白酶组织抑制因子 (TIMP - 1)mRNA表达的影响。结果 :ZnPP -Ⅸ使低氧大鼠PAMP明显升高 ,肺组织匀浆CO含量明显降低 ;ZnPP -Ⅸ能促进TGF - β3 蛋白表达和TGF - β3 mRNA表达 ,显著促进低氧大鼠肺动脉Ⅰ型胶原蛋白表达和Ⅰ型前胶原mRNA表达 ,上调TIMP - 1mRNA的表达。结论 :内源性CO可能通过抑制TGF - β3mRNA和TGF - β3 蛋白表达而抑制胶原蛋白的合成 ,促进胶原的降解 ,从而对低氧大鼠肺动脉胶原代谢发挥重要的调节作用。更多还原

【Abstract】 AIM: To explore the impact of endogenous carbon monoxide （CO） on the expression of transforming growth factor-beta 3 （TGF-β₃） and type Ⅰcollagen in pulmonary artery of rats under hypoxia. METHODS: In the model of rats under hypoxic pulmonary hypertension,the measurement of pulmonary artery mean pressure （PAMP） and carboxyhemoglobin （HbCO） formation within pulmonary tissue homogenates was performed. TGF-β₃ and collagen Ⅰexpressions were detected by immunohistochemical assay. The expressions of TGF-β₃,type Ⅰ procollagen mRNA,and tissue inhibitor of metalloproteinase -1 （TIMP-1） mRNA were detected by in situ hybridization. RESULTS: ZnPP significantly increased PAMP and markedly decreased HbCO formation within lung tissue homogenates in rats under hypoxia（ P< 0.01）. Meanwhile,ZnPP promoted the expression of TGF-β₃ and collagen Ⅰprotein in pulmonary arteries in rats under hypoxia （ P< 0.01）. ZnPP obviously elevated the expressions of TGF-β₃ mRNA,type Ⅰ procollagen mRNA,and TIMP-1 mRNA in pulmonary arteries in rats under hypoxia （ P< 0.01）. CONCLUSION: Endogenous CO plays an important role in decreasing collagen synthesis and promoting degradation in pulmonary artery of rats under hypoxia by inhibiting the expression of TGF-β₃.更多还原