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Circulation Research. 1999;85:829-840

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Right arrow Animal models of human disease
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(Circulation Research. 1999;85:829-840.)
© 1999 American Heart Association, Inc.


Cellular Biology

Cytokine-Mediated Apoptosis in Cardiac Myocytes

The Role of Inducible Nitric Oxide Synthase Induction and Peroxynitrite Generation

Margaret A. Arstall, Douglas B. Sawyer, Ryuji Fukazawa, Ralph A. Kelly

From the Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Mass.

Abstract—Increased production of nitric oxide (NO) after induction of the cytokine-inducible isoform of nitric oxide synthase (iNOS or NOS2) in cardiac myocytes and other parenchymal cells within the heart may in addition to contributing to myocyte contractile dysfunction also contribute to the induction of programmed cell death (apoptosis). To investigate the mechanism(s) by which increased NO production leads to apoptosis, we examined the role of NO in primary cultures of neonatal rat ventricular myocytes (NRVMs) after induction by the cytokines interleukin-1ß (IL-1ß) and interferon {gamma} (IFN{gamma}) or exposure to the exogenous NO donor S-nitroso-N-acetylcysteine (SNAC) or peroxynitrite (ONOO-). Both SNAC (1 mmol/L) and ONOO- (100 µmol/L), but not their respective controls (ie, N-acetylcysteine and pH-inactivated ONOO-), induced apoptosis in confluent, serum-starved NRVMs at 48 hours. Similarly, incubation of NRVMs with IL-1ß and IFN{gamma} for 48 hours resulted in an increase in iNOS expression, nitrite production, and programmed cell death. Both the cytokine-induced nitrite accumulation and myocyte apoptosis could be completely prevented by the nonselective NOS inhibitor L-nitroarginine (3 mmol/L) or the specific iNOS inhibitor 2-amino-5,6-dihydro-6-methyl-4H-1,3-thiazine (AMT, 100 µmol/L). NO-mediated myocyte apoptosis was not attenuated by the inhibition of soluble guanylyl cyclase with ODQ, nor could apoptosis be induced by the incubation of NRVMs with 1 mmol/L 8-bromo-cGMP, a cell-permeant cGMP analogue. However, NO-mediated apoptosis was significantly attenuated by the superoxide dismutase mimetic and ONOO- scavenger Mn(III)tetrakis (4-benzoic acid) porphyrin (MnTBAP, 100 µmol/L). NO/ONOO--mediated apoptosis was associated with increased expression of Bax with no change in Bcl-2 mRNA abundance. Furthermore, apoptotic cell death was also confirmed in adult rat ventricular myocytes (ARVMs) when grown in heteroculture with IL-1ß– and IFN{gamma}-treated rat cardiac microvascular endothelial cells. Therefore, cytokine-induced apoptosis in NRVMs and ARVMs is mediated by iNOS induction, ONOO-, and associated with an increase in Bax levels.


Key Words: nitric oxide • peroxynitrite • cytotoxicity • apoptosis • programmed cell death




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