Localization and expression of heat shock protein 70 with rat myocardial cell damage induced by heat stress in vitro and in vivo

Chen,Hongbo; Adam,Abdelnasir; Cheng,Yanfen; Tang,Shu; Hartung,Jörg; Bao,Endong

doi:10.3892/mmr.2014.2986

Localization and expression of heat shock protein 70 with rat myocardial cell damage induced by heat stress in vitro and in vivo

Authors:
- Hongbo Chen
- Abdelnasir Adam
- Yanfen Cheng
- Shu Tang
- Jörg Hartung
- Endong Bao
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Affiliations: College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, P.R. China, Institute for Animal Hygiene, Animal Welfare and Farm Animal Behaviour, University of Veterinary Medicine Hannover, Foundation, Hannover 30173, Germany
Published online on: November 20, 2014 https://doi.org/10.3892/mmr.2014.2986
Pages: 2276-2284

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Abstract

The aim of the present study was to investigate the association between heat shock protein (Hsp) 70 expression kinetics and heat stress‑induced damage to rat myocardial cells in vitro and in vivo. The results showed that the activity of heart injury‑associated enzymes, including aspartate aminotransferase and creatine kinase, significantly increased and myocardial cells developed acute histopathological lesions; this therefore suggested that heat stress altered the integrity of myocardial cells in vitro and in vivo. Levels of Hsp70 in vitro decreased following the initiation of heat stress and then steadily increased until heat stress ceased at 100 min; however, in vivo studies demonstrated a gradual increase in Hsp70 levels in the heart cells of rats from the initiation of heat stress, followed by a sharp decline at 100 min. These results indicated that the cells sustained different degrees of injury in vivo compared with those sustained in vitro, this may be due to different regulatory mechanisms in the two environments. Intracytoplasmic Hsp70 signaling was significantly reduced at 60 min in vitro, compared with that of the in vivo study, indicating that Hsp70 consumption may have exceeded its production prior to 60 min of heat stress, and following 60 min the cells produced sufficient Hsp70 protein for their protection against heat stress. Hsp70‑positive signals in the cytoplasm of heart cells in vivo were more prominent in the intact areas compared with those of the degenerated areas and the density of Hsp70‑positive signals was significantly reduced following 60 min of heat stress. In conclusion, comprehensive comparisons of enzymes, cell morphology and Hsp70 levels indicated that decreased levels of Hsp70 were associated with the reduced protective effect on myocardial cells in vitro and in vivo.

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