(Circulation. 1999;100:2100-2107.)
© 1999 American Heart Association, Inc.
Basic Science Reports |
MAPK Superfamily Plays an Important Role in Daunomycin-Induced Apoptosis of Cardiac Myocytes
From the Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, Japan.
Correspondence to Issei Komuro, MD, PhD, Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. E-mail komuro-tky{at}umin.ac.jp
Background—Although anthracyclines, such as daunomycin (DM) and adriamycin, are potent chemotherapeutic agents, they have serious adverse effects, including cardiac toxicity. In the present study, we investigated the molecular mechanisms of DM-induced cardiomyocyte impairment.
Methods and Results—When cultured cardiac myocytes of neonatal rats were exposed to 1 µmol/L DM for 24 hours, many cells became positive for TUNEL staining, with morphological changes characteristic of apoptosis. Fragmentation of DNA into oligonucleosome-size fragments was recognized by agarose gel electrophoresis in DM-treated myocytes. DM activated 3 members of the mitogen-activated protein kinase (MAPK) family dose-dependently, such as extracellular signal-regulated protein kinases (ERKs), c-Jun NH2-terminal kinases, and p38 MAPK in cardiac myocytes. Oxyradical scavengers or Ca2+ chelators inhibited DM-induced activation of ERKs and p38 MAPK. DM-induced activation of ERKs was also inhibited by overexpression of dominant negative mutants of Ras (D.N.Ras), and the p38 MAPK activation was attenuated by D.N.Rho. The number of DM-induced apoptotic cells was markedly increased when the ERK signaling pathway was selectively blocked by a specific MAPK/ERK kinase inhibitor, PD98059, whereas pretreatment with a specific inhibitor of p38 MAPK, SB203580, significantly reduced the amount of apoptosis.
Conclusions—These results suggest that DM activates MAPKs through reactive oxygen species and Ca2+ and that the MAPK family plays important roles in DM-induced apoptosis in cardiac myocytes. ERKs protect cardiomyocytes from apoptosis, whereas p38 MAPK is involved in the induction of cardiomyocyte apoptosis.
Key Words: daunomycin • kinase • apoptosis • myocytes
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