Synthesis of diacylated γ-glutamyl-cysteamine prodrugs, and in vitro evaluation of their cytotoxicity and intracellular delivery of cysteamine

European Journal of Medicinal Chemistry
Lisa FrostRosaleen J Anderson

Abstract

To overcome the major disadvantages of cysteamine, the only registered treatment for the rare genetic disease cystinosis, nine prodrugs of γ-glutamyl-cysteamine (4) were synthesized for evaluation. Esterification of the thiol conferred oxidative stability, while sufficient lipophilicity for oral bioavailability was achieved by acylation of the α-carboxyl group of γ-glutamyl-cysteamine (4). Low cytotoxicity was observed in cultured HaCaT keratinocytes using the MTT assay, with EC50 values higher than or similar to that of cysteamine. Successful uptake of the esterified prodrugs and the subsequent release of cysteamine into cultured human proximal tubule epithelial cells were demonstrated using CMQT derivatisation and HPLC with UV detection. These prodrugs show potential as novel delivery vehicles of cysteamine to improve the treatment of the genetic disorder nephropathic cystinosis.

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Citations

Feb 16, 2017·Scientific Reports·Mohamed A ElmonemElena Levtchenko
Dec 30, 2016·Carbohydrate Research·Yasaman RamazaniNeil P J Price
Jun 24, 2017·Journal of Inherited Metabolic Disease·L Gallego-VillarH J Blom
Jan 17, 2020·Critical Reviews in Toxicology·Patrick E Hanna, M W Anders
May 13, 2021·Trends in Molecular Medicine·Amer JamalpoorManoe J Janssen

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