机构地区:[1]南昌大学医学院第二附属医院心内科,心研所,江西省分子医学重点实验室,江西南昌330006
出 处:《中国病理生理杂志》2008年第1期89-92,共4页Chinese Journal of Pathophysiology
基 金:江西省科学技术厅重大项目
摘 要:目的:探讨心肌营养素-1(CT-1)在高血压心室重塑中的作用。方法:3-4代心肌成纤维细胞用于实验,分为对照组、助溶剂(二甲亚砜,DMSO)组、CT-1反义寡核苷酸组(ASODN)、正义寡核苷酸对照组(SODN)、PD98059组、AG490组、LY294002组。利用自制压力培养装置,将各组细胞置于160mmHg压力下培养8h。STAT3、ERK1/2和PI3-K的活性通过Western blotting分析测定;MTT测定心肌成纤维细胞增殖。结果:高静水压明显促进心肌成纤维增殖,CT-1表达上调,CT-1ASODN干预后,CT-1ASODN能抑制高静水压所致的细胞增殖(0.132±0.013vs0.154±0.011,P<0.05),STAT3、ERK1/2和PI3-K蛋白表达水平明显低于对照组(2.09±0.25vs2.47±0.28,P<0.05)、(1.13±0.19vs1.61±0.22,P<0.05)、(1.25±0.23vs1.71±0.25,P<0.05)。AG490组明显减弱高静水压的促增殖作用(0.118±0.018vs0.155±0.010,P<0.05)并且增加ERK1蛋白磷酸化(1.85±0.18vs1.45±0.23,P<0.05);PD98059增强高静水压的促增殖(0.185±0.011vs0.155±0.010,P<0.05)并且增加STAT3蛋白磷酸化(1.83±0.23vs1.58±0.22,P<0.05),PI3/K阻断剂LY294002干预后对高静水压的促增殖作用无影响(0.157±0.015vs0.155±0.010,P>0.05);SOND(0.151±0.010vs0.154±0.011,P>0.05)和DMSO组(0.141±0.017vs0.155±0.010,P>0.05)与对照组相比对心肌成纤维细胞增殖无明显差别。结论:高静水压下,心肌成纤维细胞增殖主要通过STAT3通路;ERK1/2通路通过抑制STAT3的活性起负向调节作用,可能在防止心肌成纤维细胞过度增殖起重要的作用;PI3-K没有参与这一作用。上述STAT3通路与ERK1/2通路之间的相互作用可能有助于防止诱导成纤维细胞过度增殖。AIM: To investigated the role of CT - 1 in the hypertensive ventricular remodeling. METHODS: The cardiac fibroblasts in 3 -4 passages were cultured in vitro, and divided into eight groups according to the different intervention factors: group C (control) ; group DM: dimethyl sulphoxide (DMSO) ; group P: cultured under high hydrostatic pressure (160 mmHg) ; group ASODN: interfered with CT - 1 antisense oligodeoxynucleotides (10 μmol/L) ; group SODN: incubated with CT- 1 sense oligodeoxynucleotides (10 μmol/L) ; group AG: interfered with AG490 (25 μmol/L) ; group PD: interfered with PD98059 (20 μmol/L) ; group LY: interfered with LY 294002 ( 10 μmol/L). Western blotting was employed to assess the expression of STAT3, ERK1/2 and PI3 - K respectively at protein level. Cell proliferation was quantified by MTT. RESULTS: High hydrostatic pressure stimulated the proliferation of cardiac fibroblasts, upregulated the expression of CT - 1. CT - 1ASODN inhibited the proliferation of cardiac fibroblasts (0. 132 ± 0. 013 vs 0. 154 ± 0. 011, P〈0. 05). ASODN extensively inhibited the expression of STAT3, ERK1/2 and PI3 -k respectively at protein level (2. 09±0. 25 vs 2. 47±0. 28, P 〈0. 05), ( 1.13±0. 19 vs 1.61±0. 22, P 〈0. 05), ( 1.25±0. 23 vs1. 71±0. 25, P 〈 0. 05 ). AG490, a JAK - STAT3 inhibitor, reversed the increase in the proliferation of cardiac fibroblasts stimulated by high hydrostatic pressure and the expression of ERK1 phosphorylation ( 0. 118 ± 0. 018 vs 0. 155 ± 0. 010, P 〈 0. 05). PD98059, a MAPK - ERK1/2 inhibitor, increased the proliferation of cardiac fibroblasts stimulated by high hydrostatic pressure (0. 185 ± 0. 011 vs 0. 155 ± 0. 010, P 〈 0.05 ) and the expression of STAT3 phosphorylation ( 1.83 ± 0. 23 vs 1.58 ± 0. 22, P 〈 0. 05). LY294002, a PI3 - K inhibitor, had no effect on the proliferation of cardiac fibroblasts stimulated by high hydrostatic pressure (0. 157 ± 0. 015 vs 0. 155 ± 0.
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