Tretinoin enhances minoxidil response in androgenetic alopecia patients by upregulating follicular sulfotransferase enzymes

Abstract

Minoxidil sulfate is the active metabolite required to exert the vasodilatory and hair growing effects of minoxidil. For hair growth, sulfotransferase enzymes expressed in outer root sheath of the hair follicle sulfonate minoxidil. The large intra‐subject variability in follicular sulfotransferase was found to predict minoxidil response and thus explain the low response rate to topical minoxidil in the treatment of androgenetic alopecia. A method to increase minoxidil response would be of significant clinical utility. Retinoids have been reported to increase minoxidil response. The purported mechanism of action was retinoid modulation of skin permeation to minoxidil; however, evidence to the contrary supports retinoids increase dermal thickness. In order to elucidate the effect of topical retinoids on minoxidil response, we studied the effect of topical tretinoin on follicular sulfotransferase. In this study, we demonstrate that topical tretinoin application influences the expression of follicular sulfotransferase. Of clinical significance, in our cohort, 43% of subjects initially predicted to be nonresponders to minoxidil were converted to responders following 5 days of topical tretinoin application. To the best of our knowledge, this is the first study to elucidate the interaction mechanism between topical minoxidil and retinoids and thus provides a pathway for the development of future androgenetic alopecia treatments.

An Updated Review of Topical Tretinoin in Dermatology: From Acne and Photoaging to Skin Cancer

“…A test measuring follicular sulfotransferase enzymatic activity showed an accuracy of 98% in identifying nonresponders to minoxidil [ 62 ]. In a prospective study (N = 20) [ 63 ], five applications of topical tretinoin 0.1% increased follicular sulfotransferase expression in 43% of patients initially predicted to be non-responders. These subjects were then converted into responders to minoxidil.…”

Microemulsions as Solubilizers and Penetration Enhancers for Minoxidil Release from Gels

“…In the last decade, many experimental studies have focused on the improvement of topical administration of MXD by different strategies: nanoemulsions [ 40 , 41 ], nanovesicles [ 42 ], nanostructured lipid carriers [ 43 ], electrodynamic microneedles [ 44 ], the synergistic effect of other drugs, e.g., tretinoin [ 45 ] and others [ 46 ]. The study of Maitra et al [ 21 ] brought positive results in terms of MXD enhancement in permeation through the skin (in vitro, ex vivo, in vivo) from ME-based formulation consisting of oleic acid, PEG 600, Span 20 and water.…”

Consensus Recommendations for the Management of Androgenetic Alopecia in Egypt: A Modified Delphi Study

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