Role of G proteins and modulation of p38 MAPK activation in the protection by nitric oxide against ischemia-reoxygenation injury

Roby D. Rakhit, Alamgir N.M. Kabir, James W. Mockridge, Adrian Saurin, Michael S. Marber

Research output: Contribution to journalArticle

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Abstract

Protein kinase C (PKC)-mediated regulation of the mitogen-activated protein kinases (MAPK) may play a role in the protection afforded by ischemic preconditioning (PC). Nitric oxide (NO) can influence MAPK activation via interaction with PKC or farnesylation of low-molecular-weight (LMWT) G proteins. However, we have recently reported the mechanism of NO-induced cardioprotection to be a PKC-independent process. Therefore, we investigated the role of LMWT G proteins and MAPK signaling in NO-induced cardioprotection against simulated ischemia-reoxygenation (SI-R) injury. Neonatal rat cardiomyocytes treated for 90 min with the NO donor S-nitroso-N-acetyl-L, L-penicillamine (SNAP) 1 mM were protected against 6 h of SI (hypoxic conditions at 37°C with 20 mM lactate, 16 mM KCl at pH 6.2) and 24 h reoxygenation under normal culture conditions. NO-induced protection was blocked by the G protein inhibitor α-hydroxyfarnesylphosphonic acid (αHFP) 10 μM. We studied the time course of p42/44 and p38 MAPK dual-phosphorylation hourly during SI using phosphospecific antibodies, p38 was phosphorylated during SI and the peak phosphorylation was significantly delayed by SNAP pretreatment. The p38 inhibitor SB203580 1 μM, given during SI, protected against injury. Thus the delay in peak p38 activation may contribute to, rather than be the effect of, NO-induced cardioprotection. We have shown that p38β does not contribute to the total p38 signal in our extracts. Thus there is no detectable β isoform. We conclude that the main isoform present in these cells and thought to be responsible for the observed phenomenon, is the α isoform,

Original languageEnglish
Pages (from-to)995-1002
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume286
Issue number5
DOIs
Publication statusE-pub ahead of print - 7 Sep 2001

Fingerprint

p38 Mitogen-Activated Protein Kinases
GTP-Binding Proteins
Nitric Oxide
Ischemia
Chemical activation
Modulation
Mitogen-Activated Protein Kinases
Protein Kinase C
Wounds and Injuries
Protein Isoforms
Phosphorylation
Penicillamine
Molecular Weight
Molecular weight
Protein Prenylation
Phospho-Specific Antibodies
Ischemic Preconditioning
Nitric Oxide Donors
Cardiac Myocytes
Rats

Keywords

  • G proteins
  • Mitogen-activated protein kinase
  • Nitric oxide
  • P38
  • Preconditioning

Cite this

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title = "Role of G proteins and modulation of p38 MAPK activation in the protection by nitric oxide against ischemia-reoxygenation injury",
abstract = "Protein kinase C (PKC)-mediated regulation of the mitogen-activated protein kinases (MAPK) may play a role in the protection afforded by ischemic preconditioning (PC). Nitric oxide (NO) can influence MAPK activation via interaction with PKC or farnesylation of low-molecular-weight (LMWT) G proteins. However, we have recently reported the mechanism of NO-induced cardioprotection to be a PKC-independent process. Therefore, we investigated the role of LMWT G proteins and MAPK signaling in NO-induced cardioprotection against simulated ischemia-reoxygenation (SI-R) injury. Neonatal rat cardiomyocytes treated for 90 min with the NO donor S-nitroso-N-acetyl-L, L-penicillamine (SNAP) 1 mM were protected against 6 h of SI (hypoxic conditions at 37°C with 20 mM lactate, 16 mM KCl at pH 6.2) and 24 h reoxygenation under normal culture conditions. NO-induced protection was blocked by the G protein inhibitor α-hydroxyfarnesylphosphonic acid (αHFP) 10 μM. We studied the time course of p42/44 and p38 MAPK dual-phosphorylation hourly during SI using phosphospecific antibodies, p38 was phosphorylated during SI and the peak phosphorylation was significantly delayed by SNAP pretreatment. The p38 inhibitor SB203580 1 μM, given during SI, protected against injury. Thus the delay in peak p38 activation may contribute to, rather than be the effect of, NO-induced cardioprotection. We have shown that p38β does not contribute to the total p38 signal in our extracts. Thus there is no detectable β isoform. We conclude that the main isoform present in these cells and thought to be responsible for the observed phenomenon, is the α isoform,",
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Role of G proteins and modulation of p38 MAPK activation in the protection by nitric oxide against ischemia-reoxygenation injury. / Rakhit, Roby D.; Kabir, Alamgir N.M.; Mockridge, James W.; Saurin, Adrian; Marber, Michael S.

In: Biochemical and Biophysical Research Communications, Vol. 286, No. 5, 07.09.2001, p. 995-1002.

Research output: Contribution to journalArticle

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AU - Kabir, Alamgir N.M.

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AU - Marber, Michael S.

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