Breathing pattern response and epithelial labeling in ozone-induced airway injury in neutrophil-depleted rats.

Breathing pattern response and epithelial labeling in ozone-induced airway injury in neutrophil-depleted rats.
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中性粒细胞耗竭大鼠臭氧诱导气道损伤的呼吸模式反应和上皮标记。

DOI:
10.1165/ajrcmb.20.4.3362
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发表时间:
1999
期刊:
American journal of respiratory cell and molecular biology.
影响因子:
--
通讯作者:
Hyde,DM
Hyde,DM
中科院分区:
--
文献类型:
--
作者:
Vesely,KR;Schelegle,ES;Stovall,MY;Harkema,JR;Green,JF;Hyde,DM

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为了检验中性粒细胞增强臭氧 (O3) 损伤的气道上皮修复的假设,我们使用兔抗大鼠中性粒细胞血清 (ANS) 和用正常兔血清 (NRS) 处理的对照大鼠研究了中性粒细胞耗尽的大鼠的呼吸模式反应以及气道上皮损伤和修复。 37 只 Wistar 大鼠暴露于 O3 (1 ppm) 或过滤空气 (FA) 中 8 小时,然后在 FA 中暴露 8 小时。暴露于 O3 的 NRS 和 ANS 处理的大鼠显示出类似的潮气量渐进性减少和呼吸频率增加,最大变化发生在暴露 8 小时时,而暴露于 FA 的大鼠则没有显示出显着变化。与 O3 暴露的 NRS 治疗的大鼠相比,O3 暴露的 ANS 治疗的大鼠在鼻腔、支气管和远端气道中显示出更多的上皮坏死。使用光学解剖器​​对 BrdU 标记的末端细支气管上皮细胞进行计数来评估 5-溴-2-脱氧尿苷 (BrdU) 的掺入(一种细胞增殖的量度)。与 O3 暴露的 NRS 治疗大鼠相比,O3 暴露的 ANS 治疗大鼠的 BrdU 标记上皮细胞显着减少。我们得出的结论是,中性粒细胞通过增强 O3 损伤的气道上皮细胞的增殖来促进修复过程。
To test the hypothesis that neutrophils enhance the repair of ozone (O3)-injured airway epithelium, we investigated breathing pattern responses and airway epithelial injury and repair in rats depleted of neutrophils using rabbit antirat neutrophil serum (ANS) and control rats treated with normal rabbit serum (NRS). Thirty-seven Wistar rats were exposed to O3(1 ppm) or filtered air (FA) for 8 h followed by 8 h in FA. O3-exposed NRS- and ANS-treated rats showed similar progressive decreases in tidal volume and increase in breathing frequency, with maximal changes occurring at 8 h of exposure, whereas FA-exposed rats showed no significant changes. O3-exposed ANS-treated rats showed more epithelial necrosis in the nasal cavity, bronchi, and distal airways than did O3-exposed NRS-treated rats. Incorporation of 5-bromo-2-deoxyuridine (BrdU), a measure of cellular proliferation, was assessed using an optical disector to count BrdU- labeled terminal bronchiolar epithelial cells. O3-exposed ANS-treated rats had significantly less BrdU- labeled epithelial cells than did O3-exposed NRS-treated rats. We conclude that neutrophils contribute to the repair process by enhancing the proliferation of O3-injured airway epithelial cells.
大鼠鼻上皮对臭氧的增殖反应。
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