异甘草酸镁对小鼠放射性肺纤维化的改善作用及其机制的初步研究

异甘草酸镁对小鼠放射性肺纤维化的改善作用及其机制的初步
研究
张攀;刘涛;王芳芹;阳群芳;陈晓红
【期刊名称】《中国药理学通报》
【年(卷),期】2017(33)2
【摘要】Aim To investigate the effect of magnesi-um isoglycyrrhizinate (MgIG)on radiation -induced pulmonary fibrosis in mice and the mechanism.Meth-ods Fifty female C57BL/6 mice were randomly divid-ed into control group,irradiation (RT)group,MgIG group,RT +MgIG group and RT +dexamethasone (DXM)group,with 1 0 mice in each group.Except for control group and MgIG group,the remaining mice were given a single 1 5Gy 60 Co γray on w hole lung. The mice in each group were administered 2 h before irradiation and each day after irradiation:MgIG group and RT +MgIG group were administered with MgIG (1 00 mg·kg -1 )by intraperitoneal injection;control group and RT group were administered with normal sa-line (20 mL·kg -1 )by intraperitoneal
injection;RT+DXMgroup was administered with DXM(0.5 mg· kg -1 )by intraperitoneal injection.After 1 2 weeks,the mice were sacrificed and lung tissues were taken out. The degree of alveolitis and pulmonary fibrosis were observed by HE staining and Masson staining.The ex-pressions of type Ⅰ collagen,type Ⅲ collagen and TGF-β1 protein were detected by immunohistochem-isty.Results The alveolitis,pulmonary
fibrosis and expressions of type Ⅰ collagen,type Ⅲ collagen, TGF-β1 ,p-Smad2,p-Smad3 increased significantly in RT group compared with control group (P <0.05 ), and were significantly lower in RT +MgIG group and RT +DXMgroup than those in RT group(P <0.05). Conclusion MgIG can improve radiation-induced pulmonary fibrosis in mouse lung tissue,and its mech-anism may be related to the influence of MgIG on TGF-βsignaling pathway.%目的：探讨异甘草酸镁（magnesium isoglycyrrhizinate， MgIG）对小鼠放射性肺纤维化的影响及其机制。

方法50只♀ C57BL／6小鼠随机分为对照组（Control 组）、辐照组（RT 组）、异甘草酸镁组（MgIG 组）、异甘草酸镁治疗组（RT＋MgIG 组）和地塞米松治疗组（RT ＋DXM组），每组10只。

除 Control 组和 MgIG 组外，其余各组小鼠均给予15Gy 60 Co γ射线全胸单次照射。

各组小鼠于辐照前2 h 及辐照后每日给药：MgIG 组和 RT ＋MgIG 组腹腔注射 MgIG（100 mg· kg －1）；Control 组和 RT 组腹腔注射生理盐水（20 mL · kg －1）；RT ＋DXM组腹腔注射 DXM（0.5 mg·kg －1）。

辐照后12周取材，行 HE 染色及 Masson 染色观察小鼠肺泡炎和肺纤维程度，免疫组化检测肺组织Ⅰ型胶原（Collagen Ⅰ）、Ⅲ型胶原（Collagen Ⅲ）和转化生长因子-β1（TGF-β1）蛋白表达。

结果RT 组小鼠肺泡炎和肺纤维化程度及CollagenⅠ、Collagen Ⅲ、TGF-β1、p-Smad2、p-Smad3蛋白表达较 Con-trol 组明显增强（P ＜0.05），而 RT ＋MgIG 组与 RT ＋DXM组肺泡炎、肺纤维化程度及蛋白表达相较于 RT 组明显降低（P＜0.05）。

结论异甘草酸镁可有效改善小鼠放射性肺纤维化，其机制可能与调控 TGF-β信号通路有关。

【总页数】6页(P201-205,206)
【作者】张攀;刘涛;王芳芹;阳群芳;陈晓红
【作者单位】第三军医大学药学系药理学教研室，重庆 400038;第三军医大学药学系药理学教研室，重庆 400038;第三军医大学药学系药理学教研室，重庆400038;第三军医大学药学系药理学教研室，重庆 400038;第三军医大学药学系药理学教研室，重庆 400038
【正文语种】中文
【中图分类】R-332;R284.1;R322.35;R349.1;R563.102.2;R977.6
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