Heat shock protein (HSP 72) expression in patients undergoing cardiac operations.
The major mammalian stress-inducible protein, heat shock protein 72, protects cells from certain stresses and rapidly accumulates in cells after ischemia. Heat shock protein 72 is rapidly synthesized in the myocardium of various species in response to ischemia, but it has not been investigated in human heart. To determine if heat shock protein 72 accumulated in the ischemic myocardium of patients undergoing cardiac operations, we obtained sequential right atrial biopsy specimens from 12 patients undergoing repair at three intervals: before bypass, after reperfusion, and after bypass. Immunoblot analysis for heat shock protein 72 demonstrated a high expression in the human heart compared with other mammalian hearts, p (Binomial) = 0.01. Compared with before bypass, heat shock protein 72 contents after reperfusion and after bypass were 98.2% +/- 8.9%, p (signed-rank) = 0.65, and 87.6% +/- 17.1%, p (signed-rank) = 0.28, respectively. Although heat shock protein 72 concentration was unchanged in hearts after reperfusion and after bypass, the initial prebypass level of heat shock protein 72 was high. The high heat shock protein 72 level detected in human hearts may reflect preoperative disease and drug therapy, or inherently high levels may be usual in the human myocardium. These findings indicate that the myocardium of patients undergoing cardiac operations contains relatively high concentrations of heat shock protein 72, which are not increased during the surgical procedure.
Department of Surgery, Deborah Heart and Lung Center, Browns Mills, N.J. 08015.
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Ianuzzo
D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D006348:Cardiac Surgical Procedures; D002315:Cardiopulmonary Bypass; D002648:Child; D002675:Child, Preschool; D005260:Female; D006003:Glycogen / Q000378:metabolism; D050884:HSP72 Heat-Shock Proteins; D006325:Heart Atria / Q000473:pathology; D006360:Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D015151:Immunoblotting; D007773:Lactates / Q000378:metabolism; D019344:Lactic Acid; D008297:Male; D008875:Middle Aged; D015425:Myocardial Reperfusion; D015428:Myocardial Reperfusion Injury / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism*
D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D007773:Lactates; D019344:Lactic Acid; D006003:Glycogen