Full Expression of Cardiomyopathy Is Partly Dependent on B-Cells: A Pathway That Involves Cytokine Activation, Immunoglobulin Deposition, and Activation of Apoptosis.

Autor: Cordero-Reyes AM; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.) Houston Methodist Hospital Research Institute, Houston, TX (A.M.C.R., K.A.Y., D.J.H., J.D.E., G.T.A.) Colegio de Ciencias de la Salud, Escuela de Medicina, Universidad San Francisco de Quito, Quito, Ecuador (A.M.C.R.)., Youker KA; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.) Houston Methodist Hospital Research Institute, Houston, TX (A.M.C.R., K.A.Y., D.J.H., J.D.E., G.T.A.)., Trevino AR; Department of Medicine and Weill Cornell Medical College, Houston Methodist Hospital, Houston, TX (A.R.T., D.J.H.)., Celis R; University of Texas Medical Branch, Galveston, TX (R.C.)., Hamilton DJ; Houston Methodist Hospital Research Institute, Houston, TX (A.M.C.R., K.A.Y., D.J.H., J.D.E., G.T.A.) Department of Medicine and Weill Cornell Medical College, Houston Methodist Hospital, Houston, TX (A.R.T., D.J.H.)., Flores-Arredondo JH; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.)., Orrego CM; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.)., Bhimaraj A; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.)., Estep JD; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.) Houston Methodist Hospital Research Institute, Houston, TX (A.M.C.R., K.A.Y., D.J.H., J.D.E., G.T.A.)., Torre-Amione G; Houston Methodist DeBakey Heart & Vascular Center, Houston, TX (A.M.C.R., K.A.Y., J.H.F.A., C.M.O., A.B., J.D.E., G.T.A.) Houston Methodist Hospital Research Institute, Houston, TX (A.M.C.R., K.A.Y., D.J.H., J.D.E., G.T.A.) Catedra de Cardiologia y Medicina Vascular, Tecnológico de Monterrey, Mexico (G.T.A.).
Jazyk: angličtina
Zdroj: Journal of the American Heart Association [J Am Heart Assoc] 2016 Jan 14; Vol. 5 (1). Date of Electronic Publication: 2016 Jan 14.
DOI: 10.1161/JAHA.115.002484
Abstrakt: Background: Limited information exists on the role of B-cell-dependent mechanisms in the progression of heart failure (HF). However, in failing human myocardium, there is evidence of deposition of activated complement components as well as anticardiac antibodies. We aimed to determine the contribution of B-cells in HF progression using a nonsurgical mouse model of nonischemic cardiomyopathy (CMP).
Methods and Results: CMP protocol involved the use of l-NAME and NaCl in the drinking water and angiotensin-II infusion for 35 days. At day 35, mice were analyzed by cardiac magnetic resonance imaging, gene expression, and histology. Mice (12 weeks old) were divided into 4 groups, all in C57BL/6 background: wild-type (WT) CMP; severe combined immunodeficiency (SCID) CMP (T- and B-cell deficient); CD22(-) CMP (B-cell depleted); and Nude CMP (T-cell deficient), with their respective controls. We performed B-cell depletion and reconstitution protocols. The protective effect of B-cell depletion was demonstrated by a significant reduction of cell hypertrophy and collagen deposition and a preserved ejection fraction in the CD22(-) CMP group compared to WT CMP. Once SCID mice underwent B-cell reconstitution with isolated CMP B-cells, the CMP phenotype was restored. Furthermore, deposition of IgG3 and apoptosis in the myocardium follows the development of CMP; in addition, in vitro studies demonstrated that activated B-cells stimulate collagen production by cardiac fibroblasts.
Conclusions: The absence of B-cells in this model of HF resulted in less hypertrophy and collagen deposition, preservation of left ventricular function, and, in association with these changes, a reduction in expression of proinflammatory cytokines, immunoglobulin G deposition, and apoptosis in the myocardium. Taken together, these data suggest that B-cells play a contributory role in an angiotensin-II-induced HF model.
(© 2016 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley Blackwell.)
Databáze: MEDLINE
Externí odkaz: