[Autoantibodies to M2-cholinoreceptors as a potential development factor of arrhythmia in patients with paroxysmal atrial fibrillation].

Abstract:

AIM:We aimed to assess autoantibodies to M2-cholinoceptors (M2-CR) in patients with paroxysmal lone atrial fibrillation (AF) and in patients with AF and arterial hypertension (AH). MATERIALS AND METHODS:100 patients with lone AF and 84 patients with AF and AH were included. Patients underwent clinical blood and urinalysis, assessment of biochemistry blood panel, 12-lead ECG, 24-hour Holter monitoring, echocardiography and stress - testing (treadmill or stress - echocardiography). Assessment of IgM and IgG autoantibodies to M2-CR was performed by indirect immunoenzyme assay. The following peptide molecules were used as epitopes for detection of autoantibodies: M1 - amino acid sequence YTVIGYWPLGVVCDL (83-98) of the first extracellular loop of M2-CR; M2 - sequence VRTVEDGECYIQFFSNAAVTFGTAI (168-192) of the second extracellular loop of M2-CR; M3 - sequence NTFCAPCIPNTV (410-421) of the third extracellular loop of M2-CR; M4 - short sequence VEDGECYIQFFS (171-182) of the second extracellular loop of M2-CR; M1+M4 - chimeric molecule formed by sequences of the first and the second extracellular loops of M2-CR connected by disulfide bound YTVIGYWPLGVVCDL + VEDGECYIQFFS (83-98 + 171-182). RESULTS:Autoantibodies to M2-CR were found in 45% patients with lone AF and in 35% patients with AF and AH. In patients with lone AF prevalence of increased IgG to M2-CR were greater than in patients with AF and AH (32% vs 20%; p. :Цель. Определение аутоантител к М2-холинорецепторам (М2-ХР) у больных пароксизмальной формой идиопатической фибрилляции предсердий (ФП), больных ФП в сочетании с гипертонической болезнью (ГБ), и оценка их возможной роли в развитии и поддержании аритмии. Материалы и методы. В исследование включали больных идиопатической пароксизмальной формой ФП (n=100) и больных ФП в сочетании с ГБ (n=84) моложе 66 лет. Больным проводили общеклинические анализы крови и мочи, биохимический анализ крови, регистрацию электрокардиограммы (ЭКГ), эхокардиографию, суточное мониторирование ЭКГ по Холтеру, пробу с дозированной физической нагрузкой. Определение аутоантител иммуноглобулинов (Ig) M и IgG к различным аминокислотным последовательностям М2-ХР проводили унифицированным непрямым иммуноферментным анализом. В качестве антигенных детерминант для выявления аутоантител выбраны следующие пептидные фрагменты внеклеточных петель молекулы М2-ХР: М1 - аминокислотная последовательность YTVIGYWPLGVVCDL (83-98) 1-й внеклеточной петли; M2 - аминокислотная последовательность VRTVEDGECYIQFFSNAAVTFGTAI (168-192) 2-й внеклеточной петли; M3 - аминокислотная последовательность NTFCАPCIPNTV (410-421) 3-й внеклеточной петли; M4 - короткая аминокислотная последовательность VEDGECYIQFFS (171-182) 2-й внеклеточной петли; M1+M4 - синтетическая химерная молекула, образованная аминокислотной последовательностью 1-й внеклеточной петли, связанной с короткой аминокислотной последовательностью 2-й внеклеточной петли посредством дисульфидной связи YTVIGYWPLGVVCDL + VEDGECYIQFFS (83-98 + 171-182). Результаты. Аутоантитела к различным аминокислотным последовательностям М2-ХР обнаружены у 45% больных идиопатической ФП и у 35% больных ФП в сочетании с ГБ. У пациентов с идиопатической ФП существенно чаще обнаруживалось значимое повышение IgG к М2-ХР по сравнению с группой больных ФП в сочетании с ГБ (32% против 20%; p.

journal_name

Ter Arkh

journal_title

Terapevticheskii arkhiv

authors

Mironova ES,Mironova NA,Sharf TV,Efremov EE,Azmuko AA,Molokoedov AS,Zykov KA,Golitsyn SP

doi

10.26442/00403660.2019.09.000280

subject

Has Abstract

pub_date

2019-09-15 00:00:00

pages

101-107

issue

9

eissn

0040-3660

issn

2309-5342

journal_volume

91

pub_type

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