HCN4、Cx43在电击死者窦房结组织中的表达变化

Changes of HCN4, Cx43 Expression in the Sinoatrial Node of Electric Shock Death

目的研究电击死者心脏窦房结组织中超极化激活环核苷酸门控阳离子通道4(hyperpolarizationactivated cyclic nucleotide-gated cation channel 4,HCN4)及连接蛋白43(connexin43,Cx43)表达的变化。方法选择2010—2013年徐州医学院病理学教研室尸体解剖中有明确电流斑的电击死者34例作为电击死组,并设交通事故颅脑损伤死者20例作为对照组。应用免疫组织化学法检测HCN4和Cx43在心脏窦房结组织中的表达。结果 HCN4阳性细胞表达于窦房结细胞膜及细胞质中,Cx43阳性细胞表达于窦房结T细胞及心肌细胞的细胞膜及细胞质中。电击死组HCN4的表达高于对照组(P<0.05),Cx43的表达低于对照组(P<0.05)。结论电击死者窦房结组织中HCN4和Cx43表达的变化,说明电击死可能与心脏电生理的改变及冲动传导改变有关。

Objective T o investigate the expression of hyperpolarization-activated cyclic nucleotide-gated cation channel 4 （H C N 4） and connexin43 （C x43） in the sinoatrial node of electric shock death. Meth-ods As experim ental group, 34 cases of electric shock death who had definite current m ark evidence were selected from pathology departm ent of X uzhou M edical C ollege from 2010 to 2013. As the control group, 20 cases of fatal severe craniocerebral injury in traffic accidents were chosen. T he expressions of H C N 4 and C x43 in the sinoatrial node were observed by im m unohistochem ical technology. Results H C N 4 positive cells expressed in the cell m em brane and cytoplasm of the sinoatrial node. C x43 positive cells expressed in the cell m em brane and cytoplasm of T cells and m yocardial cells. T he expression of H C N 4 was significantly higher than that of the control group （P〈0.05） and the expression of C x43 was signifi-cantly lower than that of the control group （P〈0.05）. Conclusion T he changes of H C N 4 and C x43 ex-pressions in the sinoatrial node illustrate electric shock death m ight be related to the abnorm alities of cardiac electrophysiology and conduction.