Back to Search Start Over

Toll-like receptor expression and apoptosis morphological patterns in female rat hearts with takotsubo syndrome induced by isoprenaline.

Authors :
Kołodzińska A
Czarzasta K
Szczepankiewicz B
Główczyńska R
Fojt A
Ilczuk T
Budnik M
Krasuski K
Folta M
Cudnoch-Jędrzejewska A
Górnicka B
Opolski G
Source :
Life sciences [Life Sci] 2018 Apr 15; Vol. 199, pp. 112-121. Date of Electronic Publication: 2018 Mar 01.
Publication Year :
2018

Abstract

Aims: Toll-like receptors (TLR) and apoptosis were indicated as important factors in heart failure. Our aim was to characterize the morphological pattern of apoptosis, TLR2, TLR4, and TLR6 expression in female rat hearts in the model of takotsubo syndrome (TTS).<br />Main Methods: 60 Sprague-Dawley female rats were treated with a single dose of 150 mg/kg b.wt. of isoprenaline (ISO) or 0.9% NaCl (controls). Hearts were collected 24, 48, 72 h and 7 days post-ISO injection. 32/60 hearts were used in immunohistopathological studies and 28/60 in real time.<br />Key Findings: Apoptosis was observed 24 h post-ISO in cardiomyocytes, 24, 48, 72 h and 7 days post-ISO in infiltrating inflammatory cells, 7 days post-ISO in endothelial cells of vessels. Diffuse TLR4CD68 (CD68, a macrophage marker) and TLR6CD68 positive cells and TLR2, TLR4, TLR6 mononuclear cells were observed in both acute and recovery phase of TTS. In the foci located in the neighborhood of damaged (necrotic/apoptotic) cardiomyocytes in TTS, high (strong) protein expression of TLR2 (TLR2 <superscript>high</superscript> ) was observed: 24, 48, 72 h post-ISO; TLR4 <superscript>high</superscript> - 48 and 72 h post-ISO; TLR6 <superscript>high</superscript> - 48 h post-ISO. Whereas in cardiomyocytes of remote myocardium: TLR2 <superscript>high</superscript> - 72 h post-ISO; TLR4 <superscript>high</superscript> - 24 and 72 h post-ISO; TLR6 <superscript>high</superscript> - 24 h post-ISO. TLR2 mRNA was down-regulated 48 and 72 h post-ISO whereas TLR4 up-regulated 7 days post-ISO.<br />Significance: The expression pattern of apoptosis and TLR differs in the course of TTS in comparison with the control rats. We hypothesize that innate immunity and apoptosis may play a crucial role in TTS pathophysiology.<br /> (Copyright © 2018 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1879-0631
Volume :
199
Database :
MEDLINE
Journal :
Life sciences
Publication Type :
Academic Journal
Accession number :
29501923
Full Text :
https://doi.org/10.1016/j.lfs.2018.02.042