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Roles of calcitonin gene-related peptide on growth of premature rat type Ⅱ alveolar epithelial cells exposed to hyperoxia
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 5
- DOI:
- 10.3321/j.issn:1000-2790.2009.05.003
- Key Word:
- 高氧;肺泡Ⅱ型上皮细胞;降钙素基因相关肽;婴儿,早产
Abstract： 目的:探讨降钙素基因相关肽(CGRP)对600 mL/L氧暴露早产鼠肺泡Ⅱ型上皮细胞(AEC Ⅱ)生长增殖的影响.方法:原代分离培养孕19 d早产鼠AECⅡ,随机分为4组:空气组、高氧组、高氧CGRP组、高氧CGRP拮抗剂组.空气组,高氧组分别在氧体积分数为210 mL/L的空气和600 mL/L的氧气中暴露24 h;高氧CGRP组在暴露前加入CGRP;高氧CGRP拮抗剂组在暴露前同时加入CGRP和CGRP受体拮抗剂,再置于氧体积分数为600 mL/L的氧气中培养24 h.采用MTr比色法和流式细胞术测定细胞增殖能力和细胞周期;逆转录聚合酶链反应和免疫荧光技术测定表面活性蛋白C(SPC)的mRNA及蛋白表达.结果:与空气组比较,高氧组细胞存活率下降,G0/G1期细胞比例增高,G2/M及S期细胞比例降低,SPC mRNA及SPC蛋白表达低下(P均<0.01).而CGRP干预可促进高氧暴露AECⅡ的增殖能力,使S及G2/M期细胞增多,并提高AECⅡ的SPC mRNA及SPC蛋白表达水平.结论:600 mL/L氧暴露24 h可抑制早产鼠AEC Ⅱ增殖分化,而CGRP可促进AECH生长,部分解除高氧对AECⅡ的抑制作用.
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