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Letrozole induces hepatotoxicity without causing oxidative stress: the protective effect of melatonin

Mehmet Aydin1, Süleyman Oktar, Orhan Veli Ozkan

  • 1Medical Faculty of Mustafa Kemal University, Department of Physiology, Hatay, Turkey.

Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology
|June 10, 2010
PubMed
Abstract

Insights

Letrozole (LTZ) may harm liver function without increasing oxidative stress, but melatonin (MLT) can restore liver health. This study in female rats shows MLT

Area of Science:

  • Pharmacology
  • Hepatology
  • Toxicology

Background:

  • Aromatase inhibitors (AIs) like letrozole (LTZ) are used in cancer therapy.
  • Potential side effects of LTZ on hepatic function and oxidative stress are not fully understood.
  • Melatonin (MLT), a known antioxidant, may offer protective effects.

Purpose of the Study:

  • To investigate the impact of LTZ and MLT on hepatic function in female rats.
  • To assess the effects of LTZ and MLT on oxidative stress markers in liver tissue and serum.

Main Methods:

  • Thirty-two female rats were divided into four groups: control, LTZ, LTZ + MLT, and MLT.
  • LTZ was administered orally (1 mg/kg/day), and MLT was given subcutaneously (0.5 mg/kg/day).
  • Hepatic function markers, oxidative stress parameters (SOD, CAT, MDA), and biochemical profiles were analyzed.

Main Results:

  • LTZ administration elevated liver enzymes (AST, LDH, ALP), bilirubin, and caused minor histological damage.
  • Oxidative stress parameters (SOD, CAT, MDA, TAC, TOS) did not significantly differ between groups.
  • MLT treatment ameliorated LTZ-induced hepatic function disturbances and reversed histological changes.

Conclusions:

  • Letrozole may induce hepatotoxicity through mechanisms independent of oxidative stress.
  • Melatonin demonstrates a protective role, restoring hepatic function and mitigating LTZ-induced liver damage.
  • MLT may be a potential therapeutic agent to counteract LTZ-related hepatotoxicity.

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