Design of a Supersoft Topical JAK Inhibitor, Which Is Effective in Human Skin but Rapidly Deactivated in Blood
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G Thoma, O Decoret, E Vangrevelinghe…
Journal of medicinal …, 2023
ACS Publications
We describe the discovery and characterization of the supersoft topical JAK inhibitor 3 (R), which is potent in biochemical and cellular assays as well as in human skin models. In blood, the neutral ester 3 (R) is rapidly hydrolyzed (t 1/2∼ 6 min) to the corresponding charged carboxylic acid 4 exhibiting> 30-fold reduced permeability. Consequently, acid 4 does not reach the intracellular JAK kinases and is inactive in cellular assays and in blood. Thus, hydrolysis by blood esterases leads to the rapid deactivation of topically active ester 3 …