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Curr Pharm Biotechnol. 2017;18(14):1141-1150. doi: 10.2174/1389201019666180308091504.

Effects of a Series of Acidic Drugs on L-Lactic Acid Transport by the Monocarboxylate Transporters MCT1 and MCT4.

Author information

1
Faculty of Pharmacy, Université de Montréal, Montreal, QC, Canada.
2
Centre de Recherche du Centre Hospitalier de l'Universite de Montreal (CRCHUM), Montreal, QC, Canada.
3
College of Pharmacy, University of Florida, Orlando, FL, United States.

Abstract

BACKGROUND:

Drug-induced myopathy is a serious side effect that often requires removal of a medication from a drug regimen. For most drugs, the underlying mechanism of drug-induced myopathy remains unclear. Monocarboxylate transporters (MCTs) mediate L-lactic acid transport, and inhibition of MCTs may potentially lead to perturbation of L-lactic acid accumulation and muscular disorders. Therefore, we hypothesized that L-lactic acid transport may be involved in the development of drug-induced myopathy. The aim of this study was to assess the inhibitory potential of 24 acidic drugs on L-lactic acid transport using breast cancer cell lines Hs578T and MDA-MB-231, which selectively express MCT1 and MCT4, respectively.

METHODS:

The influx transport of L-lactic acid was minimally inhibited by all drugs tested. The efflux transport was next examined: loratadine (IC50: 10 and 61 µM) and atorvastatin (IC50: 78 and 41 µM) demonstrated the greatest potency for inhibition of L-lactic acid efflux by MCT1 and MCT4, respectively. Acidic drugs including fluvastatin, cerivastatin, simvastatin acid, lovastatin acid, irbesartan and losartan exhibited weak inhibitory potency on L-lactic acid efflux.

RESULTS:

Our results suggest that some acidic drugs, such as loratadine and atorvastatin, can inhibit the efflux transport of L-lactic acid.

CONCLUSION:

This inhibition may cause an accumulation of intracellular L-lactic acid leading to acidification and muscular disorders.

KEYWORDS:

Adverse drug reactions; drug-transporters; lactic acid; loratadine; monocarboxylate transporters; statins.

[Indexed for MEDLINE]

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