哮喘小鼠模型中內(nèi)質(zhì)網(wǎng)應(yīng)激變化及谷氨酰胺的干預(yù)作用機(jī)制
[Abstract]:BACKGROUND & OBJECTIVE: The incidence of asthma is increasing all over the world, and the incidence of asthma in China is also increasing year by year. Therefore, the study of the pathogenesis of asthma and the search for effective and less side-effect drugs have become a hot spot. Endoplasmic reticulum stress (ERS) is a protective stress response of eukaryotic cells, including viral infection, oxidative stress, ischemia and hypoxia, undernutrition and so on. Calcium imbalance can cause ERS, so ERS is involved in many pathological and physiological processes, including liver function damage, neurodegenerative diseases, circulatory system diseases, tumor occurrence and development. There are many reports about the relationship between ERS and COPD in respiratory diseases, but there are few reports about the relationship between ERS and asthma in China, and the essence of asthma is chronic airway inflammation, so it is speculated that ERS is also involved in the pathogenesis of asthma. Glutamine is a non-essential amino acid in the body, mainly used as a gastric mucosal protective agent in the treatment of chronic gastritis, ulcers, etc., but many scholars have found that glutamine has anti-inflammatory, immune regulation, protection of mucosal barrier and other effects, and the incidence of asthma is related to abnormal T cell immune function, and to Chronic airway inflammation is its characteristic, and glutamine may be used in the treatment of asthma. This paper mainly discusses the changes of endoplasmic reticulum stress and inflammatory factors in asthmatic mice model, and observes the therapeutic effect of glutamine on asthma and its possible mechanism after intervention with glutamine.
Method:
1.6-8 weeks old BALB/C mice were sensitized with ovalbumin and aluminium hydroxide and then inhaled with aerosolized ovalbumin to induce airway asthma in mice. Amido treatment group: 1.5g/kg.
2. serum levels of IL-6, IL-4, IgE, TNF alpha and IL-12 were measured by ELISA in each group of mice.
3. Diff-quik staining was used to detect the number of leukocytes and eosinophils in BALF-centrifuged cells.
4. the supernatants of BALF from each group were determined by ELISA, IL-6, IL-4.
5. one lung tissue of mice was fixed with formaldehyde, then HE staining was used to observe the changes of lung inflammation.
6. on the other side of the lung, the expression of JNK, pJNK, CHOP, GRP78IRE-1, BAX, Bcl2 and Caspase12 in lung tissue were detected by Western Blot.
7. Establishment of cell ERS model with chlamydia: Human lung adenocarcinoma cell line A549 was cultured in vitro. The inhibition rate of proliferation of A549 cells treated with Chlamydia at different concentrations (0.1ug/ml, 1ug/ml, 10ug/ml) for different time (6, 12, 24, 48h) was detected by MTT method.
8. MTT assay was used to detect the inhibitory rate of proliferation of A549 cells at different time points (12,24,48 hours) induced by different concentrations of glutamine (2,4,8,12,16 mmol/1).
9. Cell culture was divided into 5 groups, blank control group: A549 cells and Chlamycin group: A549 cells and Chlamycin 1ug/ml were added into the culture medium, and divided into 3 groups: GLN4 group: A549 cells, Chlamycin lug/ml and 4 mMmmol/1 glutamine were added into the culture medium; GLN8 group: A549 cells were added into the culture medium. GLN12 group: A549 cells were added into the culture medium, and the expressions of JNNK, pJNK.CHOP and GPR78 were detected by Western Blot method 12 hours after culture.
Result:
1. The serum levels of IL-6, IL-4, IgE and TNF-alpha in group B were significantly higher than those in group A (control group), and IL-12 was significantly lower (P 0.05). The serum levels of IL-6, IL-4, IgE and TNF-alpha in group C, D, E were significantly lower than those in group B (P 0.05).
2. Diff-quik staining results: Group B (model group) alveolar lavage fluid white blood cell and eosinophil counts were significantly higher than group A (normal group) difference was significant (p0.05); C, D, E alveolar lavage fluid white blood cell and eosinophil counts were significantly lower than the model group, but higher than the normal group, the difference was significant (P 0.05);
3. The levels of IL-6 and IL-4 in alveolar lavage fluid of group B (model group) were significantly higher than those of group A (control group) (P 0.05). The levels of IL-6 and IL-4 in alveolar lavage fluid of group C, D and E were significantly lower than those of group B (P 0.05).
4. Pulmonary histopathological results: HE staining results, group B and group A compared, bronchial and perivascular lymphocytes and eosinophils infiltration of inflammatory cells; bronchial epithelial cells more exfoliated, basement membrane can be seen slightly thickened, bronchial smooth muscle proliferation, small bronchioles can be seen more mucus thrombus and inflammatory infiltration. Inflammatory cell infiltration was also observed in the pulmonary interstitial and alveolar cavities. Compared with the model group, the infiltration of pulmonary interstitial inflammatory cells was significantly reduced in C.D.E group.
5. Compared with group A, the expression levels of pJNK. CHOP, GPR78 and IRE1 in lung tissues of mice in group B were significantly increased, but the expression of JNK was not significantly different, indicating that the lung had endoplasmic reticulum stress reaction during asthma onset. The expression levels of BAX/Bcl 2 and Caspase 12 in lung tissue of mice in group B were significantly higher than those in group A. The expression levels of BAX/Bcl 2 and Caspase 12 in glutamine treatment group were significantly lower than those in group A.
6. Cytotoxic MTT assay showed that the concentration of Chlamycin treated A549 was lug/m1, and the inhibition rate of cell proliferation was 51.3% at 12 hours, closest to 50%. Therefore, the concentration of Chlamycin was lug/ml and the action time was 12 hours.
7. MTT assay was used to detect the proliferation inhibition rate of A549 cells at different time points (12,24,48 hours) induced by different concentrations of glutamine (2,4,8,12,16 mmol/1). The results showed that the proliferation inhibition rate of A549 cells at different time points (12,24,48 hours) was 48.9% after 12 hours of glutamine 8 mmol/l treatment, which was the closest to 50%. Degree and time.
8. In vitro cell culture test, the expression levels of pJNK. CHOP and GPR78 in the Chlamydia group were significantly higher than those in the blank control group, but there was no significant difference in the expression of JNK, indicating that Chlamydia induced endoplasmic reticulum stress in A549 cells. Amides have protective effects on endoplasmic reticulum stress.
Conclusion:
1. In asthma, the levels of IL-4, IL-6, IgE and TNFalpha increased, while the levels of IL-12 in serum decreased. Glutamine treatment can reduce the release of pro-inflammatory factors and increase the levels of anti-inflammatory factors, indicating that glutamine plays a protective role in airway injury of asthma by inhibiting the inflammatory reaction of asthma.
2. In asthma, endoplasmic reticulum (ER) stress occurs in lung tissues, and there is apoptosis and inflammation. Glutamine has protective effect on ER stress, and further inhibits apoptosis and airway inflammation, thus has therapeutic effect on asthma.
3. Cell culture in vitro showed that glutamine could protect A549 cells from endoplasmic reticulum stress.
【學(xué)位授予單位】:延邊大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:R725.6;R-332
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 周濟(jì)宏;李幼生;曹亞澄;黎介壽;;腫瘤壞死因子對(duì)谷氨酰胺促大鼠組織蛋白質(zhì)合成的影響[J];腸外與腸內(nèi)營(yíng)養(yǎng);2008年01期
2 周濟(jì)宏;李幼生;洪志堅(jiān);胡心寶;解偉光;黎介壽;;感染狀態(tài)下腫瘤壞死因子和谷氨酰胺的變化[J];腸外與腸內(nèi)營(yíng)養(yǎng);2009年03期
3 全竹富;袁志超;黎介壽;;丙氨酰-谷氨酰胺雙肽對(duì)術(shù)后腸道通透性和全身炎性反應(yīng)的影響[J];腸外與腸內(nèi)營(yíng)養(yǎng);2010年01期
4 安仁哲,Jong-Gyun KIM,Jae-Ho LEE;IL-12對(duì)支氣管哮喘小鼠Th2免疫應(yīng)答的影響[J];中國(guó)當(dāng)代兒科雜志;2005年01期
5 涂海燕;陳新;李靜;;呼吸道合胞病毒感染誘導(dǎo)人支氣管上皮細(xì)胞表達(dá)胸腺基質(zhì)淋巴生成素的信號(hào)轉(zhuǎn)導(dǎo)機(jī)制探討[J];南方醫(yī)科大學(xué)學(xué)報(bào);2007年10期
6 姜莉;張黎川;王琪;王斯炎;;GRP78表達(dá)下調(diào)可降低肺腺癌細(xì)胞對(duì)VP-16的耐藥[J];中國(guó)肺癌雜志;2009年11期
7 張忠彬,夏昭林;內(nèi)質(zhì)網(wǎng)應(yīng)激與疾病[J];國(guó)外醫(yī)學(xué)(衛(wèi)生學(xué)分冊(cè));2003年03期
8 嚴(yán)潔;王秋卉;許紅陽(yáng);戴幼竹;楊挺;;強(qiáng)化谷氨酰胺對(duì)膿毒血癥患者血漿谷胱甘肽濃度的影響[J];廣東醫(yī)學(xué);2013年18期
9 趙莉,麥賢弟,檀衛(wèi)平,黃花榮,黃紹良,朱昌國(guó);哮喘患兒IL-4、IL-12與IgE水平的初步研究[J];臨床兒科雜志;2001年01期
10 徐慧;申昆玲;殷菊;趙宇紅;;IL-12對(duì)小鼠哮喘模型Th亞群和氣道炎癥的影響[J];臨床兒科雜志;2008年09期
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