摘要
探讨香青兰总黄酮(TFDM)在博来霉素(BLM)所致肺纤维化小鼠的作用机制,并探究其针对焦亡途径的作用机制。肺纤维化小鼠模型使用气管内滴注博来霉素(4 mg·kg^(-1))药液的方法建立,在相同条件下,正常组使用等量的生理盐水。造模次日,将纯水灌胃于正常组以及博来霉素组,香青兰总黄酮组和地塞米松组灌胃对应药物治疗,连续28 d。28 d后测定肺纤维化小鼠肺组织中羟脯氨酸(HYP)的含量,HE和Masson染色观察肺部炎症和纤维化的程度,ELISA检测肺纤维化小鼠血清中白细胞介素-18(IL-18)和白细胞介素-1β(IL-1β)的含量。采用Western blot法检测肺纤维化小鼠肺组织中蛋白的表达情况。HE染色显示,博来霉素组小鼠肺组织结构异常,并出现较多炎性细胞浸润;Masson染色显示,博来霉素组小鼠肺组织出现较多被染成蓝色的胶原纤维化组织。与正常组相比,博来霉素组小鼠肺组织中HYP含量以及血清中IL-18和IL-1β的水平显著上调(P<0.01);肺组织中Col-1、FN1、α-SMA、caspase-1、GSDMD、NLRP3、p62、ASC蛋白的表达显著升高(P<0.01);ATG5和Beclin1蛋白的表达显著降低(P<0.01)。与博来霉素组相比,香青兰总黄酮组和地塞米松组小鼠肺组织结构正常,炎性细胞浸润减少;蓝色的胶原纤维组织较少,肺组织纤维化程度得到缓解;HYP含量以及IL-18、IL-1β的水平显著下调(P<0.05,P<0.01);肺组织中Col-1、FN1、α-SMA、caspase-1、GSDMD、NLRP3、p62、ASC蛋白的表达显著降低(P<0.01),ATG5和Beclin1蛋白表达显著升高(P<0.01)。结果表明,香青兰总黄酮可以通过下调炎性因子及相关蛋白水平,并通过调控焦亡途径,同时有可能影响自噬,来有效缓解博来霉素所致的肺纤维化进程。
This study investigated the mechanism of total flavonoid extract from Dracocephalum moldavica(TFDM) in mice with bleomycin(BLM)-induced pulmonary fibrosis(PF) and explored its mechanism against the pyroptosis pathway. A mouse model of PF was established by intratracheal infusion of bleomycin(4 mg·kg^(-1) ),and the normal group was treated with the same dose of saline under the same conditions. After the second day of modeling, the distilled water was given to the normal and model groups by gavage, and the corresponding drug were given to the TFDM and the dexamethasone groups for 28 consecutive days. After 28 days, lung tissues of mice with PF were taken to determine the content of hydroxyproline(HYP). The degree of lung inflammation and fibrosis was observed by hematoxylin-eosin(HE) and Masson stainings, and the content of interleukin-18(IL-18) and interleukin-1β(IL-1β) in the serum of mice with PF were measured by enzyme-linked immunosorbent assay(ELISA). Western blot was used to determine the expression levels of proteins in the lung tissues of mice with PF. HE staining showed that the BLM group had abnormal lung tissue structures and showed more inflammatory cell infiltration. Masson staining showed plenty of collagenous fibrotic tissues that were stained blue in the lung tissues. As compared with the normal group, the content of HYP and levels of IL-18 and IL-1β in the serum of rats in the BLM group were up-regulated(P<0.01). The protein expressions of type Ⅰ collagen(Col-1), fibronectin 1(FN1), α-smooth muscle actin(α-SMA), cysteinyl aspartate specific proteinase-1(caspase-1), gasdermin D(GSDMD), NOD-like receptor thermal protein domain associated protein 3(NLRP3), p62, and apoptosis-associated speck-like protein containing a CARD(ASC) in the lung tissues of mice with PF in the BLM group were increased(P<0.01), whereas the protein expressions of autophagy-related 5(ATG5) and Beclin1 were decreased(P<0.01). Compared with the BLM group, the TFDM groups and dexamethasone group showed normal lung tissue structures and reduced inflammatory cell infiltration. Less collagenous fibrous tissues in blue color were seen and the fibrosis in the lung tissue was alleviated in the TFDM groups and dexamethasone group, with the down-regulation of the content of HYP and the levels of IL-18 and IL-1β(P<0.05, P<0.01). In the TFDM groups and dexamethasone group, the protein expression levels of Col-1, FN1, α-SMA, caspase-1, GSDMD, NLRP3, p62, and ASC were decreased(P<0.01), and the protein expressions of ATG5 and Beclin1 were increased(P<0.01) in the lung tissues of mice with PF. From the above results, it is known that TFDM down-regulates the levels of inflammatory factors and related proteins, and effectively mitigates the process of BLM-induced PF by regulating the pyroptosis pathways and potentially affecting the autophagy.
作者
吕佳敏
翟科峰
段红
汪威
何承辉
LYU Jia-min;ZHAI Ke-feng;DUAN Hong;WANG Wei;HE Cheng-hui(College of Pharmacy,Xinjiang Medical University,Urumqi 830011,China;School of Biological and Food Engineering,Suzhou University,Suzhou 234000,China;Xinjiang Institute of Material Medica,Urumqi 830004,China)
出处
《中国中药杂志》
CAS
CSCD
北大核心
2022年第24期6663-6671,共9页
China Journal of Chinese Materia Medica
基金
国家自然科学基金项目(81960788,82170481)
安徽省自然科学基金项目(2008085J39,2108085MH314)
高校优秀青年骨干人才国外访学研修项目(gxgwfx2021038)
宿州学院联合培养研究生科研创新基金项目(2021KYCX05)
关键词
香青兰总黄酮
肺纤维化
博来霉素
焦亡
自噬
total flavonoid extract from Dracocephalum moldavica
pulmonary fibrosis
bleomycin
pyroptosis
autophagy
作者简介
吕佳敏,E-mail:1342979678@qq.com;通信作者:何承辉,E-mail:1369467054@qq.com;通信作者:翟科峰,E-mail:kefengzhai@163.com
