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芥子气致大鼠气管急性损伤机制的探讨

     

摘要

目的:建立大鼠芥子气(SM )气管损伤模型,探讨SM致大鼠气管急性损伤的机制。方法雄性SD大鼠全身麻醉下气管插管,SM组(32只)气管内注入稀释SM (2.0 mg/kg ,0.1 mL ),丙二醇对照组(32只)注入丙二醇0.1 mL ,正常对照组(8只)不做任何处理。获取组织和血标本,行 HE染色、免疫组织化学、血清炎性因子及酶测定。结果 SM 组黏膜下有大量淋巴细胞浸润;上皮层和黏膜下层凋亡细胞Caspase-3和Caspase-9表达阳性;血清TNF-α、IL-1β、IL-6水平24 h达高峰;血清乳酸脱氢酶(LDH)、谷胱甘肽过氧化物酶(GP)、γ谷氨酰转移酶(GGT)、硫代巴比妥酸反应物质(TBARS)水平6 h或24 h达到高峰。丙二醇对照组与正常对照组黏膜下层淋巴细胞、巨噬细胞、中性粒细胞均少见。结论 SM (2.0 mg/kg)致大鼠气管急性损伤机制涉及炎性反应、细胞凋亡、氧化应激,且损伤程度与时间有相关性。%Objective To establish the sulfur mustard (SM ) induced tracheal injury model in rat and to investigate its mecha-nism .Methods Male rats (SD) were anesthetized and intra-tracheally intubated .The SM group was intra-tracheally injected by 2 mg/kg of diluted SM ,while the propylene glycol control group only by 0 .1mL of propylene glycol and the normal control group had no any treatment .The tissue and blood samples were taken for conducting the HE and immunohistochemical staining and measuring serum enzymes and andinflammatory factors .Results In the SM group ,a large number of lymphocytes infiltration in submucosa were observed;the positive expression of caspase-3 and caspase-9 were observed in epithelium and submucosa ;serum levels of TNF-α,IL-1β,IL-6 reached the peak in 24 h;serum levels of LDH ,GP ,BARS reached the peak in 6h ,so did GGT in 24 h .In the propyl-ene glycol control group and the normal control group ,lymphocytes ,macrophages and neutrophils were rare in submucosa .Conclu-sion The mechanism of SM (2 mg/kg) induced acute tracheal injury involves the inflammatory reaction ,apoptosis and oxidative stress ,moreover the lesion degree has the correlation with time .

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