DNA immunizations with M2 muscarinic and beta1 adrenergic receptor coding plasmids impair cardiac function in mice.
Autoimmune mediated myocardial damage is likely to be a pathogenic mechanism for acquired dilated cardiomyopathies. Evidence confirms that autoantibodies that bind to M(2) muscarinic (M(2)AChR) and beta(1) adrenergic receptors (beta(1)AR) are present in idiopathic dilated cardiomyopathy and Chagasic patients' sera. To elucidate the role of these antibodies in cardiac functional impairment, we used a murine model immunized with plasmids encoding the M(2)AChR or beta(1)AR via gene-gun bombardment. Anti-M(2)AChR and beta(1)AR antibodies were detected over the course of 37 weeks. These antibodies were directed to the second extracellular loop (el2) of both receptors and the third intracellular loop (il3) of the M(2)AChR. Peak antibody titers from weeks 2 to 5 against M(2)AChR-el2 and beta(1)AR-el2 as well as elevated titers against M(2)AChR-il3 were detected. Anti-M(2)AChR-il3 and anti-beta(1)AR-el2 antibodies were predominant in IgG1 subclass immunoglobulins, suggesting a T-helper-2 biased lymphocyte response. Heart morphology and function was assessed by echocardiography over the course of 42 weeks. Data showed progressive decrease in left ventricular (LV) wall thickness and LV mass that was mostly evident for beta(1)AR-immunized mice albeit a small change in LV dimensions. Fractional shortening was altered and values of 41%, 37% and 48% were observed at week 42 for the M(2)AChR, beta(1)AR and control groups respectively. In support of autonomic deregulation, a twofold increase in M(2)AChR and a similar decrease in beta(1)AR density were observed in radioligand saturation assays for both experimental groups. Histological analysis revealed myofibril disarray and fibrosis, pointing towards remodeling as a consequence of the long-term presence of anti-receptor antibodies.
Giménez
Luis E D
LE
Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal de Rio de Janeiro, Centro de Ciências da Saúde, Cidade Universitária, 21941-590 Rio de Janeiro, RJ, Brazil.
Hernández
Ciria C Q
CC
Mattos
Elisabete C
EC
Brandão
Izaira Tincani
IT
Olivieri
Bianca
B
Campelo
Roberto P
RP
Araújo-Jorge
Tânia
T
Silva
Célio Lopes
CL
Campos de Carvalho
Antônio C
AC
Kurtenbach
Eleonora
E
D000595:Amino Acid Sequence; D000818:Animals; D001323:Autoantibodies / Q000096:biosynthesis; D001327:Autoimmune Diseases / Q000209:etiology / Q000276:immunology / Q000473:pathology / Q000503:physiopathology; D002311:Cardiomyopathy, Dilated / Q000209:etiology* / Q000276:immunology / Q000473:pathology / Q000503:physiopathology; D004452:Echocardiography; D006801:Humans; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics; D043585:Receptor, Muscarinic M2 / Q000235:genetics* / Q000276:immunology*; D018342:Receptors, Adrenergic, beta-1 / Q000235:genetics* / Q000276:immunology*; D019444:Vaccines, DNA / Q000235:genetics* / Q000494:pharmacology*
D001323:Autoantibodies; D043585:Receptor, Muscarinic M2; D018342:Receptors, Adrenergic, beta-1; D019444:Vaccines, DNA