高脂饮食对大鼠肺组织CTGF的影响

目的建立高脂饮食大鼠模型,测定肺组织中超氧化物歧化酶(SOD)、丙二醛(MDA)、羟脯氨酸(HYP)和结缔组织生长因子(CTGF)含量,探讨高脂饮食与肺间质损伤的关系。方法 SD大鼠20只,随机分为高脂饮食组与对照组各10只,每日分别给予高脂(脂肪占71%总热量)和对照(脂肪占35%总热量)Lieber-DeCarli液体饲料单笼喂养,不再提供饮水。各组动物均于12周后处死,HE染色观察肺组织结构;Masson染色观察肺间质中胶原成分;比色法测肺组织中SOD、MDA、HYP含量,酶联免疫法测肺组织中CTGF的含量。结果病理观察高脂组肺泡及肺泡间隔炎性细胞浸润,部分肺泡壁破坏、塌陷,肺泡间隔中胶原纤维沉积增多、间隔增宽,高脂组肺组织匀浆MDA、HYP、CTGF含量高于对照组,SOD含量低于对照组。结论高脂饮食大鼠肺组织CTGF表达增加,肺泡结构破坏和间质胶原增加,高脂饮食可能是引起肺间质损伤的因素之一。

The Affection of High-fat Diet on CTGF of Rat Lung Tissue

Objective To explore the relation between high-fat diet and interstitial lung damage by detecting the content of SOD, MDA, HYP and CTGF in lung tissue with the set-up rat model of high-fat diet. Methods 20 SD rats were randomly divided into 2 groups： high-fat diet and control group, 10 in each, and high-fat diet and Lieber-Decarli liquid were provided respectively every day; all rats were single-caged with no water feeding; rats in both groups were killed after feeding for 12 weeks; HE staining was applied to ob- serve the structure of lung tissues while Masson staining to observe the collagen deposition of interstitial lung, colorimetry to detect the content of SOD, MDA and HYP in lung tissues and enzyme linked immunoassay to detect the content of CTGF in lung tissues. Results Pathological study suggested that, in high-fat diet group, there was an inflammatory cell infiltration in alveolar and alveolar septum, some alveolar walls were damaged or collapsed, collagen deposition among alveolar septum increased and the septum became wider; the content of MDA, HYP and CTGF in lung homogenate in high-fat diet group was higher than that in control group while its content of SOD was lower than that in control group. Conclusions High-fat diet leads to the increase of the expression of CTGF in lung tissues of rats, the damage of alveolar structure and the increase of interstitial collagen, it may be one of the factors in causing interstitial lung damage.