己酮可可碱对扩张型心肌病大鼠心室重构和心功能的影响

目的： 探讨己酮可可碱（PTX）对扩张型心肌病（DCM）大鼠心室重构和心功能的影响。方法: 制备DCM模型，随机分为PTX组（n=10）和DCM组（n=10），同时设正常对照组（n=10）。PTX组给予PTX 25 mg·kg^-1·d^-1, ip，其它2组给予生理盐水ip，共30 d。用ELISA法检测血浆中肿瘤坏死因子-α（TNF-α）、白细胞介素-6（IL-6）和IL-10的水平，Masson染色和免疫组化染色评估心肌纤维化情况，并采用彩色超声心动图评估心脏的结构和功能。结果: PTX组血浆TNF-α和IL-6的水平显著低于DCM组（P<0.01和P<0.05），但高于正常对照组（P<0.01）；而IL-10高于DCM组和正常对照组（P<0.05和P<0.01）。PTX组心肌纤维化程度较DCM组明显减轻，Ⅰ/Ⅲ型胶原比值降至正常对照组水平。PTX组左室舒张末期内径低于DCM组（P<0.05），而左室射血分数显著高于DCM组（P<0.01）。结论: PTX对DCM大鼠血浆中细胞因子的表达有明显作用，并可延缓心室重构，改进心功能。

Effects of pentoxifylline on ventricular remodeling and cardiac function of dilated cardiomyopathy rats

AIM: To explore the effects of pentoxifylline (PTX) on ventricular remodeling and cardiac function in dilated cardiomyopathy (DCM) rats.METHODS: Lewis rats were randomly allocated to a myocin-induced dilated cardiomyopathy (DCM) group receiving saline (n=10), a DCM group receiving PTX (PTX group; 25 mg·kg^-1·d^-1, ip, for 30 days, n=10) or healthy control group (n=10). The levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and IL-10 in the blood plasma were analyzed by ELISA. The extent of fibrosis was estimated using Massons staining and immunohistochemistry analyses. Cardiac structure and function were measured by echocardiography.RESULTS: PTX decreased plasma levels of TNF-α and IL-6, and increased IL-10 level in DCM animals compared with DCM group ［TNF-α: (7.21±0.24) μg/L vs (19.30±1.31) μg/L, P<0.01; IL-6: (119.60±36.58) ng/L vs (189.50±13.25) ng/L, P<0.05; IL-10: (41.26±3.27) μg/L vs (32.45±4.32) μg/L, P<0.05］. Collagen volume fraction (CVF), perivascular collagen area (PVCA) and collagen Ⅰ/Ⅲ ratio were lower in PTX group than those in DCM group ［CVF: (16.45±3.01)% vs (23.33±4.43)%, P<0.05; PVCA: 4.58±2.10 vs 13.74±4.29, P<0.05; Ⅰ/Ⅲ ratio: 2.84±0.67 vs 4.22±0.54, P<0.01］. Left ventricular end-diastolic dimension reduced ［(6.11±0.51) mm vs (6.46±0.28) mm, P<0.05］ and left ventricular ejection fraction elevated ［(77.29±5.20)% vs (62.73±10.11)%, P<0.01］ by PTX compared with DCM.CONCLUSION: PTX modulates plasma levels of inflammatory cytokines, delays the ventricle remodeling and improves the heart function in DCM rats.