Volume 26, Issue 3 pp. 347-355
ORIGINAL ARTICLE

Investigating the role of endogenous opioids and KATP channels in glycerol-induced acute renal failure

Dharmraj Singh Sauriyal

Dharmraj Singh Sauriyal

Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala 147002, Punjab, India

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Amteshwar Singh Jaggi

Amteshwar Singh Jaggi

Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala 147002, Punjab, India

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Nirmal Singh

Corresponding Author

Nirmal Singh

Correspondence and reprints:
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Arunachalam Muthuraman

Arunachalam Muthuraman

Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala 147002, Punjab, India

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First published: 11 March 2011
Citations: 7

Abstract

The present study was designed to investigate the possible role of endogenous opioids and KATP channels in glycerol-induced acute renal failure (ARF) in rats. The rats were subjected to rhabdomyolytic ARF by single intramuscular injection of hypertonic glycerol (50% v/v; 8 mL/kg), and the animals were sacrificed after 24 h of glycerol injection. The plasma creatinine, blood urea nitrogen, creatinine clearance, and histopathological studies were performed to assess the degree of renal injury. Naltrexone (2.5, 5.0 and 10.0 mg/kg s.c.), glibenclamide (5.0 and 10.0 mg/kg i.p.), and minoxidil (25 and 50 mg/kg) were employed to explore the role of endogenous opioids and KATP channels in rhabdomyolysis-induced ARF. Pretreatment with naltrexone and glibenclamide attenuated hypertonic glycerol-induced renal dysfunction in a dose-dependent manner, suggesting the role of endogenous opioids and KATP channels in the pathogenesis of myoglobuniric renal failure. However, the simultaneous pretreatment with naltrexone (10 mg/kg s.c.) and glibenclamide (10 mg/kg i.p.) did not enhance the reno-protective effects of individual drugs, suggesting that release of endogenous opioids and opening of KATP channels constitute a single pathway in acute renal injury triggered by hypertonic glycerol-induced rhabdomyolysis. Furthermore, administration of minoxidil abolished the attenuating effects of naltrexone in glycerol-induced renal failure, suggesting that opening of KATP channels is downstream to opioid receptor activation. It is concluded that hypertonic glycerol-induced rhabdomyolysis may involve release of endogenous opioids that in turn modulate KATP channels to contribute in the pathogenesis of ARF.

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