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Cardiac dysfunction in murine autoimmune myocarditis.

Abstract：

:We have investigated the pathophysiological basis of cardiac dysfunction in autoimmune myocarditis and in the resulting dilated cardiomyopathy. To this end we utilized the myosin-induced autoimmune myocarditis model in BALB/c mice. Myocarditis has been found to be associated with massive ventricular lymphocyte infiltration and a 50% reduction in tail artery blood flow, reflecting the depressed cardiac function in myocarditis. Action potential characteristics of control and diseased isolated ventricular myocytes were (mean+/-SEM): resting potential: -68.1+/-1. 1,-68.3+/-0.7 mV; action potential amplitude: 96.5+/-10.4, 92.3+/-4. 4 mV; action potential duration at 80% repolarization (APD80) 38+/-5, 116+/-24* ms; * P<0.05. We utilized the whole cell voltage clamp technique to explore ion currents involved in APD prolongation and arrhythmogenic activity, and found that in diseased myocytes the transient outward current (Ito) was markedly attenuated. At a membrane potential of +40 mV, in control and in diseased myocytes, I(to) current density was 14.7+/-1.5 and 6.5+/-1.4 pA/pF, respectively, P<0.005. In contrast, the L-type Ca2+current (ICa,L) remained unchanged. To further explore the basis for cardiac impairment, we simultaneously measured [Ca2+]i transient and contraction in isolated normal and diseased myocytes. The major findings indicated that both the relaxation kinetics of [Ca2+]i transients and myocyte contraction were significantly faster in the diseased myocytes. In conclusion, substantial, potentially reversible, electrophysiological and mechanical perturbations in ventricular myocytes from mice with myosin-induced autoimmune myocarditis appear to contribute to disease-related cardiac dysfunction.

journal_name

J Autoimmun

journal_title

Journal of autoimmunity

authors

Less H,Shilkrut M,Rubinstein I,Berke G,Binah O

doi

10.1006/jaut.1998.0273

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

209-20

issue

3

eissn

0896-8411

issn

1095-9157

pii

S0896-8411(98)90273-6

journal_volume

12

pub_type

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