April 2010 in “Cancer Research” This study found significant upregulation of IDO-1 and IDO-2 in human basal cell carcinomas, suggesting that IDO production may confer immune privilege characteristics to the tumors, potentially impacting their growth.
33 citations
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August 1993 in “FEBS Letters” This study identified a new enzyme, skin l‐tryptophan‐2,3‐dioxygenase, that may play a role in rat hair growth regulation, showing increased activity during peak hair growth periods.
15 citations
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June 2015 in “F1000Research” This study examined immune responses to Diphencyprone and found that its induced skin reactions have higher levels of negative immune regulators compared to psoriasis, suggesting differences in immune regulation may contribute to psoriasis chronicity.
4 citations
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April 2010 in “Expert review of dermatology” This article discusses the immune privilege in hair follicles and suggests that restoring its collapse might be an effective strategy for treating alopecia areata and cicatricial alopecia, but it reports no new clinical results.
July 2026 in “British Journal of Dermatology” This study found that patients with alopecia areata have lower levels of sCD83, a protein which, when supplemented in a mouse model, reversed disease symptoms and supported regulatory T cell proliferation, possibly by interacting with IDO activity.