Naunyn-Schmiedeberg's Archives of Pharmacology

, Volume 388, Issue 9, pp 931–938 | Cite as

All-trans retinoic acid mitigates methotrexate-induced liver injury in rats; relevance of retinoic acid signaling pathway

  • Mohamed G. Ewees
  • Tamer M. Abdelghany
  • Abdel-Aziz H. Abdel-Aziz
  • Mohamed S. Abdel-Bakky
Original Article
First Online:
Received:
Accepted:

Abstract

Methotrexate (MTX) is a widely used drug for treatment of rheumatic and autoimmune diseases as well as different types of cancer. One of the major side effects of MTX is hepatotoxicity. Retinoid receptors, including retinoid X receptor (RXR), and retinoic acid receptor (RAR) are vitamin A receptors that are highly expressed in the liver and regulate important physiological processes through regulation of different genes. In this study, we investigated the effect of MTX on RXR-α and RAR-α expression in the liver and the potential protective effects of all-trans retinoic acid (ATRA) in MTX-induced hepatotoxicity. Rats were randomly divided into five groups: The rates were treated with saline, DMSO, MTX (20 mg/kg/IP; single dose), ATRA (7.5 mg/kg/day, I.P), or MTX and ATRA. Rats were killed 24 h after the last ATRA injection. The liver tissues were dissected out, weighed, and subjected to histological, immunohistochemical, and biochemical examinations. Our results demonstrated that treatment with MTX resulted in significant decrease in reduced glutathione (GSH) content and superoxide dismutase (SOD) activity, with concomitant increase in ALT, AST, and MDA levels. In addition, MTX markedly downregulated the expression of both RXR-α and RAR-α, and changed the appearance of RXR-α to be very small speckled droplets. Treatment with ATRA significantly ameliorated MTX-induced effects on GSH, ALT, and MDA. Moreover, ATRA administration increased the expression and nuclear translocation of RXR-α in rat hepatocytes. In conclusion, our study revealed, for the first time, that retinoid receptors may play an important role in the MTX-induced hepatotoxicity.

Keywords

Retinoid X receptor Retinoic acid receptor All-trans retinoic acid Hepatotoxicity Methotrexate 
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Notes

Conflict of interest

The authors declare that they have no competing interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Mohamed G. Ewees
    • 1
  • Tamer M. Abdelghany
    • 1
  • Abdel-Aziz H. Abdel-Aziz
    • 1
  • Mohamed S. Abdel-Bakky
    • 1
    • 2
  1. 1.Faculty of PharmacyAl-Azhar UniversityCairoEgypt
  2. 2.College of PharmacyAljouf UniversityAljoufKingdom of Saudi Arabia

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