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NS398 protects cells from sodium nitroprusside-mediated cytotoxicity through enhancing HO-1 induction independent of COX-2 inhibition

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  • Drug Efficacy and Safety
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Abstract

Heme oxygenase-1 (HO-1) plays a preventive role in oxidative stress. In contrast, COX-2 is involved in the pathogenesis of many inflammatory diseases, thus COX-2 inhibitor is believed to exert anti-inflammatory properties by blocking COX-2. Recently, however, salicylate the active metabolite of aspirin showed COX-independent anti-inflammatory effects through induction of HO-1. Thus, we hypothesized that HO-1 are induced as an adaptive response to sodium nitroprusside (SNP) and play a protective role against cytotoxicity. Moreover, we investigated the protective effect of NS398 known as a selective COX-2 inhibitor on SNP-mediated cytotoxicity, and whether the protective effect of NS398 is due to COX-2 inhibition or not. SNP induced cytotoxicity in a dose-dependent manner, which was enhanced by inhibition of HO-1, suggesting that HO-1 acts in an adaptive response to SNP. Interestingly, NS398 decreased SNP-mediated cytotoxicity whereas COX-2 siRNA did not. Furthermore, NS398 enhanced SNP-induced HO-1 induction even though NS398 alone failed to induce HO-1 protein expression. In addition, NS398 enhanced SNP-induced COX-2, even though NS398 effectively inhibited SNP-mediated PGE2 production. These results demonstrate that NS398 exerts cytoprotective effects by inducing HO-1 independent of COX-2 inhibition.

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Abbreviations

COX-2:

cyclooxygenase-2

cAMP:

cyclic adenosine monophosphate

cGMP:

cyclic guanosine monophosphate

DFO:

deferoxamine

ERK:

extracellular regulated kinase

HO:

heme oxygenase

JNK:

c-jun N-terminal kinase

MAPK:

mitogen activating protein kinase

PGE2 :

prostaglandin E2

SNP:

sodium nitroprusside

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Correspondence to Ki Churl Chang or Hye Jung Kim.

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Nizamutdinova, I.T., Lee, J.H., Seo, H.G. et al. NS398 protects cells from sodium nitroprusside-mediated cytotoxicity through enhancing HO-1 induction independent of COX-2 inhibition. Arch. Pharm. Res. 32, 99–107 (2009). https://doi.org/10.1007/s12272-009-1123-3

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  • DOI: https://doi.org/10.1007/s12272-009-1123-3

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