摘要
目的:观察大鼠二氧化硅灌注后肺组织细胞凋亡变化规律,并探讨它们在硅肺发生发展中的意义及其活化的caspase-3在细胞凋亡过程中的作用。方法:48只SD大鼠随机分为二氧化硅灌注组和生理盐水对照组,制作大鼠硅肺纤维化模型。应用流式细胞仪观察灌注后各时相点肺组织细胞的凋亡率。应用免疫组织化学技术检测caspase-3蛋白的表达。结果:成功复制大鼠硅肺纤维化模型;实验组肺组织中细胞凋亡率明显高于对照组,并呈时间依赖性增加。Caspase-3主要在肺泡上皮细胞、肺巨噬细胞及浸润的炎症细胞中表达增强,其表达强度与细胞凋亡无明显相关性(r=0.215,P>0.05)。结论:在大鼠硅肺发生的早期阶段,肺组织细胞凋亡起重要作用;而caspase-3又在调控细胞凋亡中起重要作用。
Objective To explore the changes of apoptosis of cells in the lung tissue of rats with silica instillation and to its signifieance in silicosis, and to clarify the role of caspase-3 in the apoptosis progress. Methods Forty-eight rats were randomly divided into saline control groups and silica instillation groups, and the silicosis model was established in rats. Flow cytometry was used for detecting the rate of apoptosis at various stages. Immunohistochemistry for the expression of cleaved caspase-3. Results The model of rat silicosis was established successfully. The apoptosis rate in the experimental group was significantly higher than that in the control group, and was increased with time. Caspase-3 was mainly expressed in alveolar epithelium cells, pulmonary macrophages and infiltrated inflammation cells. The expression of caspase-3 in the experimental group was stronger than that in the control group, but its expression intensity was not related to the cell apoptosis （r=0.215, P〉0.05）. Conclusion The apoptosis of the lung cells plays an important role during rat silicosis genesis. Caspase-3 plays an important role in regulating cell apoptosis during rat silicosis genesis.
出处
《中南大学学报（医学版）》
CAS
CSCD
北大核心
2005年第4期441-443,共3页
Journal of Central South University ：Medical Science
