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Role of p38 mitogen‐activated protein kinase pathway on heart failure in the infant rat after burn injury
Author(s) -
Kita Toshiro,
Ogawa Midori,
Sato Hiroaki,
Kasai Kentaro,
Tanaka Toshiko,
Tanaka Noriyuki
Publication year - 2008
Publication title -
international journal of experimental pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.671
H-Index - 72
eISSN - 1365-2613
pISSN - 0959-9673
DOI - 10.1111/j.1365-2613.2007.00561.x
Subject(s) - p38 mitogen activated protein kinases , apoptosis , tumor necrosis factor alpha , burn injury , kinase , protein kinase a , medicine , mapk/erk pathway , mitogen activated protein kinase , creatine kinase , endocrinology , immunology , biology , microbiology and biotechnology , surgery , biochemistry
Summary We examined the hypothesis that post‐burn activation of the p38 mitogen‐activated protein kinase (MAPK) pathway is one aspect of the signalling cascade culminating in post‐burn secretion of tumour necrosis factor (TNF)‐α which contributes to post‐burn myocardial apoptosis. Studies were designed to determine the time course of the induction of p38MAPK, TNF‐α and myocardial apoptosis after burn injury. Our quantitative bacterial culture data demonstrated that viable bacteria reached the heart, and Western blotting data identified the increase in the phosphorylation of p38MAPK at an early time after burn. The peak incidence of myocardial apoptosis was also seen at an early time after burn. The expression of TNF‐α mRNA, infiltrated neutrophils and serum creatine phosphokinase myocardial band data peaked at a late time after burn. FR167653, a specific inhibitor of p38MAPK, prevented the induction of myocardial apoptosis, TNF‐α expression and myocardial injury after burn. Presumably, the bacterial LPS‐induced activation of p38MAPK pathway occurring at an early time after burn induced the subsequent myocardial apoptosis. The p38MAPK‐induced activation of pro‐inflammatory cytokine appeared to promote the degenerative myocardial injury at a late time after burn. Our present data provided evidence for the hypothesis that the p38MAPK pathway controls both myocardial apoptosis and the pro‐inflammatory mediator.