Mononuclear cell secretome protects from experimental autoimmune myocarditis.

Abstract:

AIMS:Supernatants of serum-free cultured mononuclear cells (MNC) contain a mix of immunomodulating factors (secretome), which have been shown to attenuate detrimental inflammatory responses following myocardial ischaemia. Inflammatory dilated cardiomyopathy (iDCM) is a common cause of heart failure in young patients. Experimental autoimmune myocarditis (EAM) is a CD4+ T cell-dependent model, which mirrors important pathogenic aspects of iDCM. The aim of this study was to determine the influence of MNC secretome on myocardial inflammation in the EAM model. METHODS AND RESULTS:BALB/c mice were immunized twice with an alpha myosin heavy chain peptide together with Complete Freund adjuvant. Supernatants from mouse mononuclear cells were collected, dialysed, and injected i.p. at Day 0, Day 7, or Day 14, respectively. Myocarditis severity, T cell responses, and autoantibody formation were assessed at Day 21. The impact of MNC secretome on CD4+ T cell function and viability was evaluated using in vitro proliferation and cell viability assays. A single high-dose application of MNC secretome, injected at Day 14 after the first immunization, effectively attenuated myocardial inflammation. Mechanistically, MNC secretome induced caspase-8-dependent apoptosis in autoreactive CD4+ T cells. CONCLUSION:MNC secretome abrogated myocardial inflammation in a CD4+ T cell-dependent animal model of autoimmune myocarditis. This anti-inflammatory effect of MNC secretome suggests a novel and simple potential treatment concept for inflammatory heart diseases.

journal_name

Eur Heart J

journal_title

European heart journal

authors

Hoetzenecker K,Zimmermann M,Hoetzenecker W,Schweiger T,Kollmann D,Mildner M,Hegedus B,Mitterbauer A,Hacker S,Birner P,Gabriel C,Gyöngyösi M,Blyszczuk P,Eriksson U,Ankersmit HJ

doi

10.1093/eurheartj/ehs459

subject

Has Abstract

pub_date

2015-03-14 00:00:00

pages

676-85

issue

11

eissn

0195-668X

issn

1522-9645

pii

ehs459

journal_volume

36

pub_type

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