ADAM33表達(dá)量與氣道平滑肌細(xì)胞生物力學(xué)屬性的關(guān)系研究
[Abstract]:Asthma is a common chronic respiratory disease, involving the complex interaction between environmental factors and genetic factors. It is a recognized medical problem, seriously threatening human life and health. However, its physiological and pathological mechanisms have not been fully explained. Studies have shown that the pathogenesis of asthma includes airway. Airway remodeling, airway inflammation, and airway hyperresponsiveness (AHR) have been widely recognized as possible pathogenesis of asthma. The enhancement of airway responsiveness leads to airway hyperresponsiveness, airway stenosis and subsequent respiratory dysfunction. Therefore, the variation of airway smooth muscle biomechanical properties as the ultimate factor in this pathway has become the focus of the study on the physiological and pathological mechanism of asthma.
In recent years, disintegrin and metalloproteinase 33 (ADAM33) has been identified as a susceptible gene for asthma by localized cloning and genome-wide screening techniques, and it has been found that ADAM33 gene is associated with airway inflammation and tissue remodeling characterized by asthma. The pathological changes of airway in asthma are caused by the changes of biomechanical properties of ASMC, and the expression of ADAM33 in the airway mesenchymal layer including fibroblast layer, basement membrane and smooth muscle layer of asthmatic patients is higher than that of normal people. To solve this problem, we used ovalbumin (OVA) sensitized neonatal male SD rats to construct an asthmatic animal model, and then isolated and purified ASMC for primary culture in vitro to study asthmatic pathological qi. The expression level of ADAM33 protein in ASMC and its correlation with the biomechanical behavior of ASMC were studied. The response of ASMC cells to the biomechanical behavior of ADAM33 protein was also detected in vitro.
(1) The expression of ADAM33 protein in ASMC of male SD rats sensitized by OVA was studied. Firstly, neonatal male SD rats were randomly divided into 4 groups. Asthma group was injected with mixed saline solution containing 1% OVA and 10% Al (OH) 3 on the 1st and 7th day, and 1% OVA was atomized three times a week on the 15th day for 4, 6 and 12 weeks respectively to establish different degrees of chronic OVA. VA-sensitized animals and normal control animals were treated with the same dosage of normal saline. ASMCs were isolated from animal models and cultured in vitro. Cells were subcultured to 2-5 generations for various experiments. When the cells grew to 90% fusion, total proteins were extracted and the same volume of protein solution was added to 10% SDS-PAGE. The expression of ADAM33 protein in ASMC of OVA sensitized group was significantly higher than that of control group (p0.001). The expression level of ADAM33 protein in ASMC of OVA sensitized group reached the maximum at 4 weeks, and gradually increased at 6 and 12 weeks.
(2) The biomechanical properties of ASMC from normal and OVA sensitized sources were studied. The mechanical properties of ASMC were considered to be the ultimate way to determine airway hyperresponsiveness in asthmatic patients. Fourier Transform Traction Microscopy (FTTM), Transwell chamber assay and immunofluorescence staining were used to detect the cellular mechanical properties including cell stiffness and contractility, cell traction, cell migration and cytoskeletal structural protein expression. Similarly, the traction of ASMC in OVA sensitized group increased significantly, especially in OVA sensitized 4 weeks (p0.05), and then decreased with the increase of sensitization time. The migration ability of ASMC in OVA sensitized group decreased. The expression of cytoskeleton structural protein including F-actin and Vinculin in ASMC of the sensitized group was higher than that of the control group. Especially, the expression of Vinculin in ASMC of the sensitized group was significantly higher than that of the control group at 4 weeks (p0.001).
(3) The correlation between ADAM33 protein expression and mechanical properties of ASMC was analyzed. The results showed that the changes of ADAM33 protein expression and mechanical properties of ASMC had the same response trend to OVA sensitization, suggesting that there was a certain correlation between them. Pearson correlation coefficients Cp: 0.864, 0.716, 0.67, 0.662, 0.774 respectively, as shown in Table 3.1.
(4) The response of mechanical properties of ASMC cells to ADAM33 protein expression was studied. ASMC cells were sensitized by OVA with the greatest change of protein expression and mechanical properties found in the above experiments for 4 weeks. The ASMC group silenced ADAM33 protein expression was constructed by lentivirus transfection, and then the mechanical properties of ASMC cells were detected. Compared with the untreated control group (4weeks) and lentivirus transfection control group (GFP), the stiffness and traction of cells in the silent group (pLVT453) were significantly decreased (p0.05).
These results indicate that ADAM33 protein has a strong positive correlation with the biomechanical properties of ASMC, and is directly related to the changes of mechanical properties of ASMC, and plays a key role in airway hyperresponsiveness, a pathological factor of asthma. It is helpful to further reveal the pathogenesis of bronchial asthma and provide scientific basis for exploring better therapeutic targets of asthma.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:R562.25
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