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Surgery Today

, Volume 35, Issue 9, pp 744–750 | Cite as

Protective Effect of Melatonin Against Ischemia/Reperfusion-Induced Oxidative Remote Organ Injury in the Rat

  • Ayhan Kaçmaz
  • E. Yilmaz User
  • A. Özer Şehirli
  • Metin Tilki
  • Sirri Ozkan
  • Göksel Şener
Article

Abstract

Purpose

Oxygen free radicals are considered to be important components involved in the pathophysiological tissue alterations observed during ischemia/reperfusion (I/R). Based on the potent antioxidant effects of melatonin, we investigated the putative protective role of melatonin against I/R-induced oxidative remote organ injury.

Methods

Wistar albino rats were subjected to 1 h of infrarenal aortic occlusion followed by 1 h of reperfusion to induce I/R damage. Melatonin (10 mg/kg, s.c.) or vehicle was administered twice, 15 min prior to ischemia and immediately before the reperfusion period (I/R + Mel or I/R groups). At the end of the reperfusion periods, the rats were decapitated and hepatic, ileal, and lung tissue samples were removed for biochemical analyses of: malondialdehyde (MDA), an end product of lipid peroxidation; the glutathione (GSH) levels, a key antioxidant; and the myeloperoxidase (MPO) activity, as an indirect index of neutrophil infiltration. The serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels were measured to evaluate the liver function. The wet/dry lung weight ratio was calculated to determine the extent of lung damage.

Results

The results revealed the occurrence of I/R-induced oxidative organ damage, as evidenced by increases in the MDA and MPO activity, and a decrease in GSH. Furthermore the AST, ALT levels, and the wet/dry lung weight ratio, which all increased due to I/R, were all observed to decrease after melationin treatment.

Conclusion

Since melatonin administration reversed these oxidant responses, it seems likely that melationin has a protective effect against oxidative organ damage induced by I/R.

Key words

Melatonin Ischemia/reperfusion Lipid peroxidation Glutathione Myeloperoxidase 

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Copyright information

© Springer-Verlag Tokyo 2005

Authors and Affiliations

  • Ayhan Kaçmaz
    • 1
  • E. Yilmaz User
    • 1
  • A. Özer Şehirli
    • 2
  • Metin Tilki
    • 1
  • Sirri Ozkan
    • 1
  • Göksel Şener
    • 1
  1. 1.Third Department of SurgeryHaydarpaşa Numune HospitalIstanbulTurkey
  2. 2.Department of Pharmacology, School of PharmacyMarmara UniversityIstanbulTurkey

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