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ABC transporters fulfill diverse physiological functions in different cellularlocalizations ranging from the plasma membrane to intracellular membranouscompartments. Several ABC transporters have been spotted in the endolyso-somal system, which consists of endosomes, autophagosomes, lysosomes, andlysosome-related organelles. In this review, we present an overview of lysoso-mal ABC transporters including ABCA2, ABCA3, ABCA5, ABCB6,ABCB9, and ABCD4, discussing their trafficking routes, putative substrates,potential physiological functions, and associated diseases. In addition, weoffer a critical evaluation of the literature linking ABC transporters to lyso-somal drug sequestration, examining pitfalls associated with in vitro modelsof drug resistance.
