Aclaris drug shows hair regrowth in alopecia areata mouse study

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Aclaris Therapeutics’ Novel ITK/JAK3 Inhibitor ATI-2138 Demonstrates Rapid and Sustained Hair Regrowth in Validated Murine Model of Alopecia Areata (AA)

January 27, 2026 6:55 AM EST

- ATI-2138 Outperforms Ritlecitinib in Reversal Model of Alopecia Universalis, the Most Severe AA Phenotype -

WAYNE, Pa., Jan. 27, 2026 (GLOBE NEWSWIRE) -- Aclaris Therapeutics, Inc. (NASDAQ: ACRS), a clinical-stage biopharmaceutical company focused on developing novel product candidates for immuno-inflammatory diseases, today announced recent positive preclinical results from its potent and selective ITK/JAK3 inhibitor ATI-2138 in a murine model of severe alopecia areata (AA). In this model of hair loss, conducted by Dr. Angela Christiano at Columbia University, ATI-2138 demonstrated rapid, near complete, and sustained hair regrowth compared to control... More