Induction of tumor necrosis-alpha, p38 and JNK in the spinal cord following acute heart injury in the rat model.

Abstract:

BACKGROUND:It is still not known whether the spinal cytokine signaling pathways are involved in the pathophysiologic mechanism of the acute phase of heart disease. This study examines the expression pattern of tumor necrosis factor-alpha (TNF-alpha) and its two related mitogenic-activated protein kinases, p38 and Jun-N-terminal kinase (JNK), in the spinal cord in response to acute cardiac injury (ACI). METHODS:The ACI rat model was established by intra-myocardial injection of formalin. At the indicated times after the establishment of ACI, the thoracic segments of the spinal cord were harvested and Western blot was performed to determine the expression of TNF-alpha, p38 and JNK. The localization of the cytokine and the kinases was determined by immunohistochemistry and double immunofluorescence. RESULTS:In response to ACI, TNF-alpha protein was up-regulated and reached a peak level at 6 h after ACI. The up-regulated TNF-alpha was distributed in all the laminae in the spinal cord and mainly localized in the neurons, as determined by immunohistochemistry and double immunofluorescence. In response to ACI, p38 and JNK were also up-regulated in the spinal cord. The expression profiles of p38 and JNK were similar to that of activated TNF-alpha following ACI. CONCLUSIONS:This study shows that cardiac injury can induce the activation of spinal TNF-alpha, p38 and JNK. The activated spinal cytokine signaling may contribute to disease progression in the acute phase of cardiac injury in clinical practice.

authors

Dai RP,Xu JM,Tao LJ,Li L,Li ZP,Zhang JY

doi

10.1111/j.1399-6576.2006.01218.x

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

365-71

issue

3

eissn

0001-5172

issn

1399-6576

pii

AAS1218

journal_volume

51

pub_type

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