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吸入交叉链聚烯酸的暴露会诱导肺部疾病
Yasuyuki Higashi1, Chinatsu Nishida2, Hiroto Izumi3
1Department of Respiratory Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahata-nishi-ku, Kitakyushu, Fukuoka 807-8555, Japan.
Toxicology
|November 16, 2024
概括
吸入交叉链聚烯酸 (CL-PAA) 会导致大鼠的肺炎和纤维化. 抗氧化剂N-乙半氨酸 (NAC) 减轻了这些影响,为慢性肺部疾病确定了0.2毫克/立方米的无观察到不良影响水平 (NOAEL).
科学领域:
- 毒理学 毒理学 毒理学
- 肺部医学 肺部医学
- 材料科学 材料科学 材料科学
背景情况:
- 有机聚合物,如交叉链聚烯酸 (CL-PAA) 在消费品中普遍存在.
- 之前的研究表明,CL-PAA可以引起严重的肺病,主要是通过内灌注.
- 吸入暴露是评估职业和环境风险的更相关的途径.
研究的目的:
- 在动物模型中调查CL-PAA在吸入暴露后的肺毒性.
- 为了确定CL-PAA诱导的肺损伤的剂量反应关系和持续性.
- 探索氧化应激在CL-PAA毒性中的作用以及N-乙半氨酸 (NAC) 的潜在保护作用.
主要方法:
- 在F344大鼠中进行了CL-PAA的短期 (5天) 和次慢性 (13周) 吸入暴露研究.
- 在各种度 (0.2,2.0,20 mg/m3) 的CL-PAA通过吸入.
- 使用支气管洗液 (BALF) 分析,肺组织组织学和像HO-1这样的生物标志物的测量来评估肺炎和损伤;在短期研究中包括NAC治疗.
主要成果:
- 短期吸入暴露导致肺炎标志物 (中性粒细胞,CINC,蛋白质,LDH) 和HO-1的剂量依赖性增加.
- 长期暴露导致持续的肺炎,高水平的BALF蛋白,肺HO-1和纤维化.
- NAC的使用显著降低了炎症标志物,并改善了他的病理学发现,表明氧化应激减轻了.
结论:
- 吸入CL-PAA会诱导度依赖的肺炎和持续性纤维化.
- 氧化应激在CL-PAA诱导的肺毒性中起着关键作用.
- 对于CL-PAA吸入的慢性肺部疾病,没有观察到的不良影响水平 (NOAEL) 确定为0.2 mg/m3.
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