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Research Article Open access CC BY 3.0

Synthesis and Characterization of 4-Thiobutyl-triphenylphosphonium-pantetheine, a Pantetheine Derivative

Roald A. Lambrechts, Balaji Srinivasan, Edzard M. Geertsema, Gerrit J. Poelarends, Ody C. M. Sibon, Marianne De Villiers

Chemical Science International Journal · pp. 676–686 · Published 7 May 2014

10.9734/ACSJ/2014/7335

Abstract

Pantetheine, a low molecular weight thiol, has been found to ameliorate symptoms in various disease models but specifically in Pantothenate Kinase-Associated Neurodegeneration (PKAN). Pantetheine is usually administered in its disulfide form (i.e. pantethine) since pantethine is commercially available and is reduced to pantetheine in biological systems. The applicability and efficacy of pantethine (therefore also pantetheine) as a clinical therapeutic however is hampered since both forms can be degraded by pantetheinases present in the body. Here, we report the synthesis of a masked form of pantetheine, namely 4-thiobutyltriphenylphosphonium-pantetheine (TBTP-pantetheine), following our hypothesis that this pantetheine-derivative might be more stable in the presence of pantetheinases than pantetheine itself. Higher stability would enhance transport into the cytoplasm where TBTP-pantetheine is metabolized into pantetheine which can subsequently execute its medicinal action. We find that TBTP-pantetheine is stable in aqueous solution, however it was found to be less stable in 10% fetal calf serum (which contains pantetheinases) compared to pantethine, the commercially availabile disulfide of pantetheine. We show that TBTP-pantetheine has improved lipophilicity, but equal passive membrane permeability/diffusion, as compared with pantethine.  

TBTP-pantetheine pantetheine pantetheinase coenzyme A PKAN serum stability

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