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The changes and effects of metalloproteinase-2 and tissue inhibitors of metalloproteinase-1 protein and mRNA expression in the lung tissue of neonatal rats with chronic lung disease induced by hyperoxia
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- Author:
- No author available
- Journal Title:
- CHINESE CRITICAL CARE MEDICINE
- Issue:
- 2
- DOI:
- 10.3321/j.issn:1003-0603.2008.02.004
- Key Word:
- 新生大鼠;高氧;肺疾病,慢性;基质金属蛋白酶-2;基质金属蛋白酶抑制物-2
Abstract： 目的 探讨基质金属蛋白酶-2(MMP-2)及其抑制物-2(TIMP-2)mRNA和蛋白在高氧致慢性肺疾病(CLD)新生大鼠肺组织中的动态表达规律以及在CLD发生中的作用和意义.方法 足月新生大鼠出生后12 h内分别持续吸入0.90～0.95的高氧或空气,于1、3、7、14和21 d取肺组织进行苏木素-伊红(HE)染色,辐射状肺泡计数(RAC);用免疫组化和逆转录-聚合酶链反应(RT-PCR)方法分别检测肺组织MMP-2和TIMP-2的蛋白及mRNA表达.结果 病理观察高氧组早期炎症反应,7 d出现肺泡发育阻滞,最终纤维化;在7 d时高氧组RAC值较空气组降低(P＜0.05),14 d和21 d的差异更为显著(P均＜0.01);在高氧暴露3 d时,MMP-2的蛋白和mRNA表达均较空气组增强(P＜0.05和P＜0.01),14 d时MMP-2蛋白表达减弱(P＜0.05),而mRNA水平两组间差异无统计学意义;TIMP-2的蛋白和mRNA表达在两组中各时间点比较差异均无统计学意义.结论 高氧暴露后,肺组织中MMP-2/TIMP-2表达失衡,使细胞外基质降解异常,可能是高氧致肺早期炎性损伤和最终肺间质纤维化及发育障碍的机制之一.
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