Cited by 70Drug-Induced Hepatotoxicity and ProtectionPharmacogenetics and Drug MetabolismMitochondrial Function and Pathology

Mitochondria: the gateway for tamoxifen-induced liver injury

Ribeiro, Mariana P.C., Santos, Armanda E., Custódio, José B.A.·2014·Toxicology

Abstract

Tamoxifen (TAM) is routinely used in the treatment of breast carcinoma. TAM-induced liver injury remains a major concern, as TAM causes hepatic steatosis in a significant number of patients, which can progress toward steatohepatitis. Liver toxicity is generally believed to involve mitochondrial dysfunction and TAM exerts multiple deleterious effects on mitochondria, which may account for the hepatotoxicity observed in patients treated with TAM. Endoxifen (EDX), a key active metabolite of TAM that is being investigated as an alternative to TAM in breast cancer therapy, slightly affects mitochondria in comparison with TAM and this demonstration well correlates with the absence of alterations in the clinical parameters of individuals taking EDX. The steady-state plasma concentrations of TAM and its active metabolites EDX and 4-hydroxytamoxifen (OHTAM) in patients taking TAM are highly variable, reflecting genetic variants of CYP2D6 involved in TAM metabolism. Besides de genetic polymorphisms, the intake of drugs that influence the enzymatic activity of CYP2D6 compromises the therapeutic efficiency of TAM. The knowledge of the impact of the variability of TAM metabolism in the breast cancer treatment explains the discrepant outcomes observed in patients taking TAM, as well as the individual variability of idiosyncratic liver injury and other sides effects observed. Therefore, and contrarily to the clinical use of EDX, the need of therapeutic drug monitoring and a regular assessment of liver function biomarkers should be considered in patients under therapies with TAM. In this review we focus on the mitochondrial effects of TAM and its metabolites and on the role played by mitochondria in the initiating events leading to TAM-induced hepatotoxicity, as well as the clinical implications.

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Crossref · 10.1016/j.tox.2014.05.009

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Authors
Ribeiro, M. P. C., Santos, A. E., & Custódio, J. B. A.
Affiliations
Centro de Neurociências e Biologia Celular (PT)
Corresponding author
Custódio, José B.A.
Venue
Toxicology
Publisher
Elsevier BV
Published
2014-09
Volume
323
Pages
10-18
ISSN
0300-483X (ISSN-L)
OpenAlex
W2000542914
Cited by
70
References
103
Citations by year
2026: 2 · 2025: 3 · 2024: 5 · 2023: 12 · 2022: 7 · 2021: 9 · 2020: 2 · 2019: 7 · 2018: 5 · 2017: 8 · 2016: 4 · 2015: 4 · 2014: 2
FWCI
1.07
Type
journal article
Language
en
Open access
closed
Locations
  • Toxicology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Portuguese Foundation for Science and Technology (FCT) (SFRH/BD/65130/2009)
  • Center for Neuroscience and Cell Biology, University of Coimbra, Portugal (PEst-C/SAU/LA0001/2013-2014)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
tamoxifen, hepatotoxicity, mitochondrial dysfunction, endoxifen, 4-hydroxytamoxifen, CYP2D6 polymorphism, drug metabolism, hepatic steatosis, steatohepatitis, breast cancer treatment, therapeutic drug monitoring, liver function biomarkers, idiosyncratic liver injury
MeSH terms
Animals, Humans, Mitochondria, Liver, Tamoxifen, Antineoplastic Agents, Hormonal, Chemical and Drug Induced Liver Injury

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