煙草煙霧暴露對(duì)小鼠骨骼肌炎癥的影響
[Abstract]:Objective Tobacco smoke exposure can induce abnormal pulmonary inflammation and induce emphysema in other parts of the lung. This article focuses on the effect of tobacco smoke on skeletal muscle inflammation.
Methods 48 6-month-old male Kunming mice were randomly divided into 4 groups: 12-week normal control group (group A), 24-week normal control group (group B), 12-week smoke exposure group (group C) and 24-week smoke exposure group (group D).
(1) The changes of the general condition of the mice; the pathological changes of the lungs after dissection; the changes of the weight of the mice before and after exposure to smoke;
(2) Changes of skeletal muscle: 1) The lung and skeletal muscle tissues were taken to make pathological sections to observe the morphological changes; 2) The skeletal muscle of mice was taken to detect the changes of myosin heavy chain isoforms - II beta MHC - II beta in the cytoplasm by Western blot WB.
(3) Skeletal muscle inflammatory mediators: Enzyme-linked immunosorbent assay (ELISA) was used to detect the concentrations of interleukin-8 (IL-8) and tumor necrosis factor-alpha (TNF-alpha).
(4) Expression of inflammation-regulating genes in skeletal muscle: 1. Histone deacetylase 2 (HDAC 2) protein was detected by Western blot; 2. Reverse transcriptase polymerase chain reaction (RT-PCR) was used to detect the expression of HDAC 2 mRNA; 3. Western blot was used to detect the expression of HDAC 2 protein. The expression of nuclear factor kappa B/P65 (Nuclear factor- kappa b/P65) protein.
Results (1) After 12 weeks of smoking, the weight of mice in group C and D was lower than that in group A and B (P 0.05). After 24 weeks of smoking, the weight of mice in group D was lower than that in group B. The pulmonary gross pathological morphology showed that the lung volume of smoke exposure group was larger than that of normal group, with blunt edges, multiple bullae of different sizes on the surface and poor retraction of the lungs.
(2) Observing the pathological section of lung tissue of smoke exposed mice, it was found that alveolar cavity enlarged, part of alveolar septum ruptured, alveolar cavity fused, alveoli formed in lung tissue accompanied by infiltration of peripheral inflammatory cells, indicating that the model of emphysema had been formed. Peripheral inflammatory cell infiltration was accompanied by morphological and structural changes of myocytes, disordered arrangement, and localized necrosis, indicating that the model of skeletal muscle inflammation in emphysema mice had been established. The expression of MHC-II beta chain protein in skeletal muscle tissues of A, B, C, D mice was detected by Western blot: 1.2103 [0.2197], 1.1782 [0.2046], 1.1151 [0.1956], 0.6775 [0] respectively. 1645, normal control group (A, B), 12-week smoke exposure group (C) and 24-week smoke exposure group (D) were significantly different (P 0.05), indicating that the expression of MHC-II beta chain protein in the smoke exposure group was lower than the normal control group.
(3) The average concentrations of IL-8 in the supernatant of skeletal muscle homogenate of B and D groups were 195.49 and 233.88, respectively, which were higher in smoke exposure group than in normal control group, and 124.6651 and 150.7417, respectively, which were higher in smoke exposure group than in normal control group.
(4) RT-PCR was used to detect the expression of HDAC2 mRNA in the skeletal muscle tissues of mice in groups B, D and B. The expression of HDAC2 mRNA in the skeletal muscle tissues of mice in groups A, B, C and D was 0.5942 (+ 0.107) respectively. The expression of HDAC2 in smoke exposed group was significantly lower than that in normal control group (p=0.000), and the expression of NF-kappa B/P65 protein was 0.4901+0.2591, 0.5166+0.2319 and 0.5166+0.2319 respectively. The expression of NF-kappa B/P65 protein in smoke exposure group was higher than that in normal control group (A, B), 12-week smoke exposure group and 24-week smoke exposure group (P (0.05).
CONCLUSION: 1. Long-term tobacco smoke exposure can induce vacuole-like degeneration, atrophy and dissolution of skeletal muscle cells in mice, and decrease the content of MHC-II beta chain protein in muscle fibers, indicating that it can lead to changes of skeletal muscle structure and function.
2. Long-term tobacco smoke exposure can lead to increased activity of inflammatory factors (IL-8, TNF-a) and inflammation-regulating gene NF-kappa B in skeletal muscle, and decreased expression of HDAC2, indicating that there is an obvious inflammatory reaction in skeletal muscle.
【學(xué)位授予單位】:廣西醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類(lèi)號(hào)】:R363
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