TITLE

Co-Drug Strategy for Promoting Skin Targeting and Minimizing the Transdermal Diffusion of Hydroquinone and Tranexamic Acid

AUTHOR(S)
Pei-Wen Hsieh; Wei-Yu Chen; Ibrahim. A.; Aljuffali; Chun-Che Chen; Jia-You Fang
PUB. DATE
October 2013
SOURCE
Current Medicinal Chemistry;Oct2013, Vol. 20 Issue 32, p4080
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Hydroquinone and tranexamic acids (TXA) are skin-lightening agents with a hydrophilic nature and low skin absorption. A high dose is needed for clinical use, resulting in a high incidence of skin irritation. Co-drugs formed by conjugating hydroquinone and TXA were synthesized and their in vitro and in vivo skin absorption characteristics were evaluated. The two synthesized co-drugs were 4-hydroxyphenyl 4-(aminomethyl)cyclohexanecarboxylate (HAC) and 1,4- phenylene bis(aminomethyl)cyclohexanecarboxylate (BAC). The co-drugs were chemically stable in aqueous solution, but rapidly degraded to the respective parent drug in esterases and skin homogenates. Compared to hydroquinone application, 7.2- and 2.4-fold increments in the hydroquinone skin deposition were obtained with the in vitro application of HAC and BAC. HAC and BAC led to 3- and 2-fold enhancements of equivalent TXA deposition compared to TXA administration. The in vivo experiment showed a further enhancement of co-drugs compared to the in vitro setup. The transdermal penetration of co-drugs, especially BAC, was much lower than that of hydroquinone and TXA. This indicated high-level skin targeting by the co-drugs. HAC and BAC revealed strong affinities for the viable epidermis/dermis. Hair follicles are important reservoirs for co-drug delivery. Daily administration of co-drugs to the skin did not generate irritation for up to 7 days. Both co-drugs are superior candidates for treating skin hyperpigmentation.
ACCESSION #
91684174

 

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