尾靜脈注射LR-MSCs對(duì)哮喘小鼠氣道炎癥、氣道高反應(yīng)性的影響
[Abstract]:Objective: airway inflammation and airway hyperresponsiveness are two key pathophysiological features of bronchial asthma. Previous studies have found that mesenchymal stem cells have an effective therapeutic effect on bronchial asthma. In this study, we isolated, cultured and identified mouse pulmonary mesenchymal stem cells (LR-MSCs), and explored the effects of tail vein injection of LR-MSCs on airway inflammation and airway hyperresponsiveness in asthmatic mice and a new approach to the treatment of asthma. Methods: Sca-1 CD31-CD45- cell group (LR-MSCs) was isolated from mouse lung tissue single cell suspension digested by enzyme mixture by flow cytometry and cultured in vitro. The stable passage of LR-MSCs was detected by flow cytometry and the surface markers of mesenchymal stem cells were identified. The acute asthma model was established by intraperitoneal injection and repeated atomization inhalation of chicken ovalbumin OVA, and the normal control group was established by NS, and the LR-MSCs intervention group was established by tail vein injection of LR-MSCs into the asthmatic model mice. LR-MSCs was injected into tail vein of mice treated with NS to establish LR-MSCs control group. The airway hyperresponsiveness (Penh) of mice in each group was measured by BUXCO noninvasive pulmonary function detector. The BALF, count of bronchoalveolar lavage fluid (BALF) was obtained by bronchoalveolar lavage. The total number of BALF cells, the number of neutrophils, the number of eosinophilic granulocytes and the number of monocytes in each group; The expression of Th2 type inflammatory factor (IL4,IL-5,IL-13) in BALF of each group was determined; the levels of OVAsIgE and OVAsIgG1 in serum of each group were measured by ELISA; the changes of gross tissue and the degree of inflammatory infiltration were observed by HE staining. Results: (1) Sca-1 CD31-CD45- cells were isolated and cultured in vitro, and the expression of surface markers of mesenchymal stem cells (MSCs) on the surface of Sca-1 CD31-CD45- cells was detected by flow cytometry. The positive expression of CD29,Sca-1, and CD45, in Sca-1 CD31-CD45- cell group, that is, LR-MSCs, were consistent with the expression of surface markers of mesenchymal stem cells. (2) the acute asthma model was successfully established by OVA sensitization and stimulation. The results showed that the airway hyperreactive Penh value in the asthma model group was significantly higher than that in the normal control group, and the level of Th2 type inflammatory factor IL4,IL-5,IL-13 in BALF was significantly higher than that in the normal control group. The levels of total cell count, neutrophil count, eosinophilic granulocyte count, monocyte count, serum inflammatory factor OVAsIgE and OVAsIgG1 in BALF were significantly higher than those in the control group. Compared with the normal control group, a large number of inflammatory cells infiltrated the bronchial wall and blood vessels in the asthmatic model group. (3) injection of LR-MSCs via caudal vein could effectively reduce airway hyperresponsiveness and reduce airway inflammation, which showed that the Penh value of airway hyperresponsiveness in LR-MSCs intervention group was significantly lower than that in asthmatic model group. The levels of Th2 type inflammatory factor IL4,IL-5,IL-13 in BALF, the total number of cells in BALF, neutrophil count, eosinophil count and monocyte count in LR-MSCs intervention group. The levels of OVAs IgE and OVAs IgG1 in serum inflammatory factors were significantly lower than those in asthmatic model group, and the infiltration of inflammatory cells in bronchial wall and blood vessel in LR-MSCs intervention group was less than that in asthma model group. There was no significant difference in airway hyperresponsiveness and airway inflammation between normal control group and LR-MSCs control group. Conclusion: (1) the successful isolation of lung mesenchymal stem cells (LR-MSCs,) suggests that the presence of LR-MSCs. (2) LR-MSCs can alleviate airway inflammation and airway hyperresponsiveness in asthmatic mice to some extent. It is expected to be a new approach to the treatment of asthma and has broad application prospects.
【學(xué)位授予單位】:暨南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R562.25
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