新型自身免疫相关的长QT综合征的发病原因
Yuankun Yue1, Monica Castrichini1, Ujala Srivastava1
1From Cardiovascular Research Program, VA New York Harbor Healthcare System, Brooklyn (Y.Y., U.S., F.F., K.S., Z.L., Y.Q., N.E.-S., M.M.H., X.-C.J., M.B.); Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Italy (M.C., P.-L.C., F.L.-P., P.-E.L.); Departments of Medicine, Cell Biology and Pharmacology, State University of New York Downstate Medical Center, Brooklyn (U.S., F.F., Z.L., Y.Q., M.M.H., X.-C.J., M.B.); Knight Cardiovascular Institute, Oregon Health & Science University, Portland (Z.Z.); Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin, Madison (C.J.); Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York (E.A.S.); Unit of Experimental Rheumatology, Department of Medicine, Karolinska Institute, Stockholm, Sweden (M.W.-H.); Centre de Recherche de l'Institut Universitaire en Santé Mentale de Québec, Laval University, Quebec City, Canada (M.C.); and Department of Medicine, New York University School of Medicine, New York (M.B.).
自免疫性疾病的Anti-Ro抗体向HERG通道,抑制IKr并导致QTc延长. 这项研究确立了病原性联系,并建议对受影响的患者进行例行心电图查.
科学领域:
- 心脏病学 心脏病学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 患有抗Ro抗体阳性自身免疫疾病的患者表现出高QTc延长和心室失常率.
- 这项研究调查了抗Ro抗体在向HERG K+通道方面的潜在作用,HERG K+通道是心脏再极化的一个关键因素.
研究的目的:
- 测试假设抗Ro抗体向HERG通道,导致心脏再极化异常的假设.
- 阐明抗Ro抗体对自身免疫性疾病中QTc延长的机制.
主要方法:
- 使用HEK293细胞表达HERG通道和本地心脏肌细胞的电生理学和生物化学测定.
- 对患者衍生的抗Ro抗体 (血清,IgG,亲和力净化) 进行IKr抑制的测试.
- 通过用52kDa的Ro抗原对几内亚猪进行免疫,开发了一种动物模型.
主要成果:
- 抗Ro抗体直接与HERG通道蛋白结合,抑制IKr并延长作用潜力的持续时间.
- 在几内亚猪中用52kDa Ro抗原进行免疫接种诱导了QTc延长,抗Ro抗体的产生和IKr抑制.
- 动物模型显示了抗体与几内亚猪ERG通道的交叉反应.
结论:
- 抗Ro抗体通过与HERG通道交叉反应来抑制IKr,可能是在毛孔区域.
- 这项研究提供了第一个动物模型证据,证明抗Ro抗体在自身免疫相关的QTc延长中的病原作用.
- 常规的心电图查和心律失常药物咨询建议成人患者抗Ro抗体和QTc延长.
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