Immunolocalization of interleukin-1 receptor antagonist in healthy and infarcted myocardium.

Abstract:

:Ischemic heart disease is a widespread cause of death. During infarction, myocardial injury is mediated by release of several pro-inflammatory cytokines including multifunctional interleukin-1 (IL-1). In various tissues, IL-1-mediated deleterious effects are known to be attenuated via the over-expression of natural anti-inflammatory cytokine IL-1 receptor antagonist (IL-1ra). In the present investigation, IL-1ra distribution in healthy and infarcted myocardium was studied by light and electron microscopy. After immunostaining, weak positivity resulted for cardiomyocytes in normal myocardium and, at higher degrees, in infarction border areas and ischemic ones. In ischemic areas, additional reactivity was displayed by the extracellular matrix and intravascular plasma. Immunogold labelling provided further details on intracytoplasmatic and extracellular distribution; in particular, noticeable gold particle distribution appeared on intercalated discs in normal and hypertrophic cardiomyocytes, as well as on thickened Z-lines for these latter. The present results suggest that cardiomyocytes represent a major source of IL-1ra in vivo, even though additional contribution by blood derived IL-1ra is to be taken in account in ischemic areas. In addition, ischemia-associated intracytoplasmic IL-1ra increase and its additional presence in the extracellular matrix is consistent with the concept that this cytokine plays a cardioprotective role at different levels and by distinct mechanisms.

journal_name

Histol Histopathol

authors

Bonetti A,Marchini M,Ortolani F

doi

10.14670/HH-23.1093

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

1093-102

issue

9

eissn

0213-3911

issn

1699-5848

journal_volume

23

pub_type

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