不同浓度大气细颗粒污染物PM2.5对心脏组织功能的影响

目的 探讨空气动力学直径小于2.5μm的颗粒(PM2.5)对大鼠心血管系统的影响及PM2.5影响心脏功能的机制。方法 在重庆市区采集PM2.5,选取雄性Wistar大鼠40只作为研究对象,设置正常对照组和实验染毒组[包括PM2.5低浓度组(1.0 mg/0.25 mL)、PM2.5中浓度组(3.0 mg/0.25 mL)、PM2.5高浓度组(8.0 mg/0.25 mL)]每组10只。采用气管滴注法进行PM2.5染毒,观察各组大鼠心肌组织结构、血清心肌肌钙蛋白T(cTnT)水平,同时检测心肌白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)水平,分析机体肺灌注PM2.5后心血管系统的炎性反...

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Published in现代医药卫生 Vol. 32; no. 19; pp. 2942 - 2944
Main Author 袁凌珂 章明徐 朱娱 张可珺 邓少丽
Format Journal Article
LanguageChinese
Published 第三军医大学大坪医院野战外科研究所检验科,重庆400042 2016
重庆市南开中学400030%第三军医大学大坪医院野战外科研究所检验科,重庆,400042%第三军医大学大坪医院野战外科研究所二室,重庆,400042
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ISSN1009-5519
DOI10.3969/j.issn.1009-5519.2016.19.002

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Summary:目的 探讨空气动力学直径小于2.5μm的颗粒(PM2.5)对大鼠心血管系统的影响及PM2.5影响心脏功能的机制。方法 在重庆市区采集PM2.5,选取雄性Wistar大鼠40只作为研究对象,设置正常对照组和实验染毒组[包括PM2.5低浓度组(1.0 mg/0.25 mL)、PM2.5中浓度组(3.0 mg/0.25 mL)、PM2.5高浓度组(8.0 mg/0.25 mL)]每组10只。采用气管滴注法进行PM2.5染毒,观察各组大鼠心肌组织结构、血清心肌肌钙蛋白T(cTnT)水平,同时检测心肌白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)水平,分析机体肺灌注PM2.5后心血管系统的炎性反应和心脏功能变化。结果 大鼠PM2.5染毒后,不同浓度实验染毒组大鼠心肌细胞水肿程度加深,心肌纤维呈波浪状排列,形态异常;实验染毒组大鼠血清cTnT水平明显高于正常对照组,且与PM2.5浓度呈正相关(P〈0.05),PM2.5高浓度组大鼠cTnT水平明显高于PM2.5中、低浓度组,但PM2.5中、低浓度组大鼠cTnT水平无明显差异。实验染毒组大鼠心肌组织IL-6、TNF-α水平较正常对照组明显升高,差异有统计学意义(P〈0.05),且与PM2.5浓度有关。结论 PM2.5引起Wistar大鼠心脏组织结构损伤,心血管系统出现明显的炎性反应,大鼠心脏功能出现损伤,提示PM2.5可能通过炎性反应损伤机体心血管系统,雾霾可能是诱发心血管疾病的重要原因。
Bibliography:Air pollution ; Biological factors ; Myocardium ; Cardiovascular diseases
Objective To study the effects of particles of diameter less than μm2.5 (PM2.5) in aerodynamics on the cardiovascular system, and to analyze the mechanism of PM2.5 affecting the heart function. Methods PM2.5 in Chongqing urban region was collected. Forty male Wistar rats were selected as the research subjects and divided into the normal control group and experimental contamination groups[including low concentration PM2.5 group (1.0 mg/0.25 mL),medium concentration PM2.5 group (3.0 mg/0.25 mL), high concentration PM2.5 group (8.0 rag/0.25 mL), 10 cases in each group]. The intratraeheal instillation method was adopted to conduct the PM2.5 contamination. The rat myocardial tissue structures and serum cTnT level in each group were observed. Meanwhile IL-6 and TNF-α expression levels were detected. The inflammatory reaction of cardiovascular system and cardiac function change were observed after PM2.5 pulmonary perfusion. Results The eardiomy
ISSN:1009-5519
DOI:10.3969/j.issn.1009-5519.2016.19.002