胺碘酮对乳鼠心室肌细胞起搏电流及其基因表达的影响  被引量:6

Effects of amiodarone on funny current (I_f) channel gene expression in neonatal rat ventricular myocytes

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作  者:李红霞[1] 杨向军[1] 韩莲花[1] 周亚峰[1] 赵欣[1] 蒋彬[1] 董宁征[1] 宋建平[1] 刘志华[1] 蒋文平[1] 

机构地区:[1]苏州大学附属第一医院心内科,215006

出  处:《中华心血管病杂志》2007年第5期466-470,共5页Chinese Journal of Cardiology

基  金:江苏省"135"重点人才基金(RC2003019);江苏省自然科学基金(BK2005034)

摘  要:目的运用膜片钳全细胞技术和实时定量聚合酶链式反应(real-time quantitativepolymerase chain reaction,real-time PCR),研究胺碘酮对乳鼠心室肌细胞起搏电流(funny current,I_f)及其基因表达的影响。方法分离培养乳鼠心室肌细胞,记录 I_f 并测定超极化激活的环核苷酸门控通道(hyperpolarization-activated cation channel,HCN)亚型1、HCN2、HCN3和 HCN4;分别用0.01、0.1、1、10、100 μmol/L 的胺碘酮刺激细胞3 h 和 10μmol/L胺碘酮分别刺激细胞0、0.5、1、3、6 h,观察胺碘酮对 I_f 和 HCN 的影响。结果 (1)心室肌细胞中,HCN1~4在总 HCN 的表达中所占比例分别为(0.23±0.01)%、(83.58±0.04)%、(0.79±0.01)%和(15.44±0.01)%。(2)不同浓度胺碘酮使I_f 电流密度分别降低(3.1±0.9)%、(9.7±2.4)%、(36.7±5.8)%、(80.3±1.8)%和(85.9±3.1)%;HCN2表达减少(2.1±0.8)%、(8.9±3.6)%、(30.1±4.2)%、(78.3±3.6)%和(81.1±1.9)%;HCN4减少(0.5±0.2)%、(2.1±2.6)%、(8.8±3.2)%、(60.1±4.6)%和(59.6±6.5)%。(3)刺激不同时间后,I_f 分别降低(1.1±0.1)%、(12.6±2.3)%、(80.6±2.2)%和(80.1±2.1)%;HCN2减少(1.0±0.1)%、(9.8±3.9)%、(82.9±4.6)%和(83.9±1.7)%;HCN4减少(0.1±0.1)%、(1.9±1.1)%、(59.4±7.8)%和(60.9±3.1)%;对 HCN1和 HCN3的影响差异无统计学意义。结论胺碘酮呈浓度和时间依赖性降低乳鼠心室肌细胞 HCN2和 HCN4的表达并抑制 I_f,这有利于其抗室性心律失常的治疗。Objective To analysize the effect of amiodarone on funny current (If) and hyperpolarization-activated cation channel (HCN) gene expressions of the neonatal rat ventricular myocytes. Methods Ventricular myocytes of 1-3 days-old rats were isolated and cultured. The cardiomyocytes were treated by amiodarone (0.01,0. 1,1,10,100μmol/L) for 3 hours or amiodaron ( 10 μmol/L) for 0,0. 5,1,3,6 hours. The If and HCN 1 - 4 gene expressions were measured through the whole-cell configuration of the patch-clamp technique and real-time quantitative polymerase chain reaction (real-time PCR) using SYBR Green PCR kit. Results ( 1 ) HCN1, HCN2, HCN3 and HCN4 represented (0.23±0.01)%,(83.58 ±0.04)%,(0.79 ±0.01)% and (15.44 ±0.01)% of total HCN mRNA, respectively. (2) Amiodaron resulted in a dose-dependent If [ ( 3. 1 ± 0.9 ) % , ( 9. 7 ± 2.4 ) % , ( 36. 7 ± 5.8 ) %, (80. 3 ± 1.8 ) % and ( 85.9 ± 3. 1 ) % , respectively at - 145 mV, ICso ( 1.32 ± 0. 28 ) μmol/L ], HCN2[ (2.1 ±0.8)%,(8.9 ±3.6)%,(30.1 ±4.2)%,(78.3 ±3.6)% and (81.1 ± 1.9)%, respectively] and HCN4 decrease [ (0. 5 ±0. 2)%, (2. 1 ±2. 6)%, (8. 8 ± 3.2)%, (60. 1 ±4. 6)% and (59. 6 ± 6. 5 ) % , respectively ]. (3) Amiodaron ( 10 μmol/L) also induced a time-dependent If [ ( 1.1 ± 0. 1 )%, (12. 6 ±2. 3)%, (80. 6 ±2, 2)% and (80. 1 ±2. 1 )%, respectively], HCN2 [ ( 1.0 ±0. 1 )%, (9.8 ± 3.9) %, ( 82. 9 ± 4. 6) % and ( 83.9 ± 1.7 ) %, respectively ] and HCN4 decreas [ (0. 1 ± 0. 1 ) % , (1.9± 1.1)%, (59.4 ±7.8)% and (60.9 ±3.1)%, respectively]. However, HCN1 and HCN3 expressions were not affected by amiodaron treatment. Conclusion Current density of If and the expression of HCN2 and HCN4 were decreased by amiodaron which might be the possible antiarrythmic working mechanisms of amiodaron.

关 键 词:胺碘酮 心室 电生理学 

分 类 号:R541[医药卫生—心血管疾病]

 

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