alpha7烟碱型乙酰胆碱受体对脂肪细胞促酰化蛋白的表达及机制  被引量:1

Effects of alpha7 nicotine acetylcholine receptor on acylation stimulating protein expression and as- sociated mechanism in 3T3 -L1 adipocytes

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作  者:吴静[1] 焦周阳[2] 杜心灵[3] 罗强 刘玉峰[1] 安金斗[1] 

机构地区:[1]郑州大学第一附属医院儿科,450052 [2]郑州大学第一附属医院心血管外科,450052 [3]华中科技大学同济医学院附属协和医院心血管外科

出  处:《中华实验外科杂志》2015年第8期1863-1865,共3页Chinese Journal of Experimental Surgery

基  金:国家自然科学基金资助项目(81300685)

摘  要:目的探讨alpha7烟碱型乙酰胆碱受体(α7nAChR)对乳糜微粒(CM)介导的脂肪细胞促酰化蛋白(ASP)表达及其机制。方法诱导培养3T3-L1前脂肪细胞分化成熟;酶联免疫吸附试验(ELISA)测定ASP和其前体补体c3(c3)表达;Westernblot法测定p38丝裂原活化蛋白激酶(p38)及磷酸化p38(p—p38)表达;实时定量聚合酶链反应(Real—timePCR)检测ASP受体C5L2表达。结果烟碱(1.0×10-9、1.0×10-8、1.0×10-7mot/L)呈浓度依赖性抑制CM(200μgTG/ml,24h)介导的C3和ASP表达上调(P〈0.05),α7nAChR特异性阻断剂α-银环蛇神经毒素(α-BTX)拈抗烟碱(10-8mot/L)介导这一效应[ASP(pmol/mgcellprotein):0.81±0.35比0.71±0.22,P〈O.05:c3(pmol/mgcellprotein):16.37±1.64比12.75±0.88,P〈0.05];α7nAChR抑制CM介导的p—p38上调(1.65±0.11比2.18±0.23,P〈0.05),p38特异性抑制剂SB203580预处理组p-p38及C3较CM处理组明显降低[C3(pmol/mgcellprotein):14.72±1.31比19.34±1.49,P〈0.05和p—p38:1.59±0.26比2.09±0.32,P〈0.05];α7nAChR抑制CM介导的C5L2mRNA表达下调(0.56±O.08比0.44±0.14.P〈0.05)。结论a7nAChR通过下调C3及恢复C5L2表达进而抑制CM介导脂肪细胞的ASP表达上调,p38信号通路参与调控C3的表达。Objective To investigate the effects of alpha7 nicotine acetylcholine receptor (α7nAChR) on chylomicron (CM) -induced acylation stimulating protein (ASP) expression and its relat- ed mechanisms. Methods 3T3 - L1 preadipocytes were cultured and induced to differentiate. The expres- sion of complement C3 ( C3 ) and ASP was assessed by enzyme - linked immunosorbent assay (ELISA). The total p38 mitogen - activated protein kinases ( p38 ) and phosphorylated p38 ( p - p38 ) were deter- mined by Western blotting. C5a like receptor 2 (C5L2) mRNA was detected by real -time quantitative polymerase chain reaction ( Real - time PCR). Results α7nAChR agonist nieotine ( 1.0 × 10 -9, 1.0 × 10-8, 1.0 ×10-7 mo]/L) pretreatment inhibited CM (200 μg TG/ml, 24 h) - induced C3 and ASP re- lease in 3T3 - L1 adipocytes (P 〈0. 05), an effect attenuated by α7nAChR selective nicotinic antagonist α-Bungarotoxin (α-BTX) [ASP (pmol/mg cell protein): 0.81 ±0.35 vs. 0.71 ±0.22, P〈0.05; C3 (pmol/mg cell protein) : 16. 37 ± 1.64 vs. 12. 75 ±0. 88, P 〈0. 05]. Furthermore, the inhibition of C3 expression by α7nAChR appears to be mediated by a reduction in phosphorylation of p38 ( 1.65 ± 0. 11 vs. 2. 18 ±0. 23, P 〈0. 05 ). In addition, α7nAChR inhibits CM -induced C5L2 mRNA downregulation (0. 56 ± 0. 08 vs. 0. 44 ±0. 14, P 〈 0.05 ). Conclusion ct7nAChR inhibits CM - induced ASP upregu- lation through downregulating C3 and restoring C5L2 mRNA. p38 signaling transduction pathway may be involved in the regulation of C3 expression.

关 键 词:alpha7烟碱型乙酰胆碱受体 促酰化蛋白 补体C3 P38丝裂原活化蛋白激酶 

分 类 号:R962[医药卫生—药理学]

 

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