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Cellular Biology |
From the Department of Molecular and Cellular Pharmacology, University of Miami, Fla.
Correspondence to Nanette H. Bishopric, M.D., University of Miami School of Medicine, RMSB 6038, 1600 NW 10th Ave, Miami, FL 33136. E-mail nhb{at}chroma.med.miami.edu
AbstractNitric
oxide (NO) induces apoptosis in cardiac myocytes through an
oxidant-sensitive mechanism. However, additional factors appear to
modulate the exact timing and rate of NO-dependent apoptosis. In this
study, we investigated the role of mitogen-activated protein kinases
(MAPKs) (extracellular signalregulated kinase [ERK] 1/2, c-Jun
N-terminal kinase [JNK] 1/2, and p38MAPK) in NO-mediated apoptotic
signaling. The NO donor
S-nitrosoglutathione (GSNO)
induced caspase-dependent apoptosis in neonatal rat cardiac myocytes,
preceded by a rapid (<10-minute) and significant (
50-fold)
activation of JNK1/2. Activation of JNK was cGMP dependent and was
inversely related to NO concentration; it was maximal at the lowest
dose of GSNO (10 µmol/L) and negligible at 1 mmol/L. NO slightly
increased ERK1/2 beginning at 2 hours but did not affect p38MAPK
activity. Inhibitors of ERK and p38MAPK activation did not affect cell
death rates. In contrast, expression of dominant-negative JNK1 or
MKK4 mutants significantly increased NO-induced apoptosis at 5
hours (56.77% and 57.37%, respectively, versus control, 40.5%),
whereas MEKK1, an upstream activator of JNK, sharply reduced apoptosis
in a JNK-dependent manner. Adenovirus-mediated expression of
dominant-negative JNK1 both eliminated the rapid activation of JNK by
NO and accelerated NO-mediated apoptosis by
2 hours. These data
indicate that NO activates JNK as part of a cytoprotective response,
concurrent with initiation of apoptotic signaling. Early, transient
activation of JNK serves both to delay and to reduce the total extent
of apoptosis in cardiac
myocytes.
Key Words: apoptosis cytoprotection Jun kinase nitric oxide cGMP
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