Tretinoin enhances minoxidil response in androgenetic alopecia patients by upregulating follicular sulfotransferase enzymes.
Level 4 - case-series / case-control
Uncontrolled prospective before-and-after cohort assessing an enzymatic biomarker response.
PubMed 30974011 · doi:10.1111/dth.12915
What was done
Researchers evaluated the effect of 5 days of topical tretinoin application on follicular sulfotransferase enzyme expression in hair follicles of subjects with androgenetic alopecia to determine if it altered predicted minoxidil response status.
What was found
Following 5 days of topical tretinoin application, 43% of subjects initially predicted to be nonresponders to minoxidil converted to predicted responders through upregulation of follicular sulfotransferase. The abstract reports no total sample size, absolute enzyme measurements, or confidence intervals.
Why it matters
This study provides a biochemical mechanism (sulfotransferase upregulation rather than altered skin permeation) explaining how topical retinoids may improve minoxidil response rates in nonresponders.
Limits
The abstract omits sample size, participant demographics, and statistical significance measures. The study was uncontrolled, evaluated only a 5-day exposure, and measured a surrogate enzymatic predictor rather than actual clinical hair growth outcomes.
Cited by
- supports Compounding topical minoxidil with tretinoin upregulates sulfotransferase enzyme activity in the scalp, improving minoxidil conversion.