摘要
目的 探讨抗β3肾上腺素能受体抗体(β3AA)对心力衰竭大鼠心脏是否具有保护作用.方法 本研究采用雄性Wistar大鼠为研究对象.合成β3肾上腺素能受体抗原肽段,将该抗原肽段主动免疫大鼠,经ELISA方法检测免疫鼠血清中β3AA水平,纯化β3AA阳性的免疫大鼠血清中的免疫球蛋白IgG.将大鼠分为假手术组(n=8)、心力衰竭组(HF组,n=8)、β3AA被动免疫组(HF+β3AA组,n=8)和β3AA被动免疫阴性对照组(HF+ IgG组,n=8).采用腹主动脉缩窄术建立心力衰竭大鼠模型.术后8周应用ELISA法检测大鼠血清N末端B型利钠肽原(NT-proBNP)表达水平,并应用超声心动图检测各组大鼠心功能.结果 β3AA免疫后50 d,血清中β3AA维持稳定.大鼠腹主动脉缩窄术后8周,HF组大鼠左心室舒张末期内径(LVEDD)、左心室收缩末期内径(LVESD)、室间隔厚度(IVS)均明显大于假手术组[分别为(6.92 ±0.22) mm比(5.62±0.19) mm(P <0.001),(4.63±0.23) mm比(3.50±0.20) mm(P<0.01)和(2.44±0.06) mm比(2.28 ±0.05) mm(P<0.05)],左心室射血分数(LVEF)、左心室短轴缩短率(LVFS)则明显低于假手术组[分别为(62.07±3.99)%比(79.63±3.02)%(P<0.01)和(31.46±3.22)%比(43.65±2.68)% (P <0.05)].术后8周,HF+β3AA组大鼠LVEDD和LVESD均显著低于HF+ IgG组[(6.07 ±0.30) mm比(6.92±0.24) mm(P <0.05)和(3.92 ±0.22) mm比(4.68 ±0.23)mm(P<0.05)],LVEF和LVFS则显著高于HF+ IgG组[(70.29±1.78)%比(61.95±3.03)%(P<0.05)和(38.08±2.32)%比(30.50±1.82)% (P<0.05)].HF+β3AA组大鼠血清NT-proBNP水平明显低于HF+ IgG组[(196.43±6.56) pg/ml 比(242.13±7.86) pg/ml,P<0.01].结论 β3AA被动免疫心力衰竭大鼠后可以改善心功能,并降低血清NT-proBNP水平,提示β3AA对压力后负荷性心力衰竭大鼠具有心脏保护作用.
Objective To explore the effect of the autoantibody against the β3-adrenoceptor on rats with experimental heart failure.Method The peptide corresponding to the sequence of β3 adrenoceptor was synthesized to actively immunize the rats,ELISA was used to detect the serum level of autoantibody against the β3-adrenoceptor (β3AA).Total IgGs were extracted from the serum containing β3AA in immunized rats.Aortic banding surgery was used to establish the heart failure model in male Wistar rats and rats were divided into the sham group (n =8),heart failure group (n =8),β3AA-immunized heart failure group (HF + β3AA,n =8) and corresponding negative IgG-immunized heart failure group (HF + IgG,n =8).In 6 weeks and 8 weeks after aortic banding surgery,the serum levels of NT-pro brain natriuretic peptide (NT-proBNP) were assayed with ELISA assay and cardiac function was assessed by echocardiography.Results β3AA was used to immunize rat with heart failure,the serum level of β3AA was stable at 50 days post immunization.At 8 weeks after aortic banding surgery,heart failure group showed significantly increased LVEDD [(6.92±0.22) mm vs.(5.62 ±0.19) mm,P<0.001],LVESD [(4.63 ±0.23) mm vs.(3.50±0.20) mm,P<0.01] and IVS[(2.44 ±0.06) mm vs.(2.28 ±0.05) mm,P <0.05],and decreased LVEF [(62.07 ± 3.99) % vs.(79.63 ± 3.02) %,P < 0.01] and LVFS [(31.46 ± 3.22) % vs.(43.65 ±2.68) %,P<0.05] compared with the sham group.HF + β3AA IgG group showed decreased LVEDD [(6.07±0.30) mm vs.(6.92 ±0.24) mm,P<0.05] and LVESD[(3.92±0.22) mm vs.(4.68 ± 0.23) mm,P<0.05],and higher LVEF [(70.29 ± 1.78) % vs.(61.95 ± 3.03) %,P < 0.05]and LVFS [(38.08 ± 2.32) % vs.(30.50 ± 1.82) %,P<0.05] compared to the HF + IgG group.In addition,compared with the HF + IgG group,HF + β3AA IgG group showed decreased serum levels of NT-proBNP [(196.43±6.56) pg/ml vs.(242.13 ±7.86) pg/ml,P<0.01].Conclusion Our results demonstrate that β3AA can improve cardiac function and reduce the serum levels of NT-proBNP in rat with heart failure.
出处
《中华心血管病杂志》
CAS
CSCD
北大核心
2014年第5期424-427,共4页
Chinese Journal of Cardiology
基金
山西省自然科学基金(2012011040-2)
关键词
心力衰竭
充血性
受体
肾上腺素能β3
抗体
Heart failure,congestive
Receptors,adrenergic beta-3
Antibodies