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Glossary Janus Kinase 1

enzyme involved in immune signaling and cell growth

Janus Kinase 1 (JAK1) is an enzyme that plays a crucial role in the signaling pathways of various cytokines, which are proteins important for immune system communication. It is part of the JAK family of tyrosine kinases and is involved in processes such as cell growth, development, and immune responses. In the context of hair and alopecia, JAK1 inhibitors are being researched as potential treatments for conditions like alopecia areata, an autoimmune disorder that causes hair loss.

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Research

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Selective Janus Kinase 1 Inhibition Resolves Inflammation and Restores Hair Growth Offering a Viable Treatment Option for Alopecia Areata

research Selective Janus kinase 1 inhibition resolves inflammation and restores hair growth offering a viable treatment option for alopecia areata

4 citations , January 2023 in “Skin health and disease”

This study shows that in a mouse model of Alopecia Areata, selective JAK1 inhibition facilitated hair regrowth and inflammation resolution while potentially offering a better safety profile compared to pan-JAK inhibition.

research Efficacy and safety of deuruxolitinib, an oral selective Janus kinase 1/2 inhibitor, in adults with alopecia areata: Results from the THRIVE-AA2 Phase 3, randomized, double-blind, controlled trial

2 citations , November 2025 in “Journal of the American Academy of Dermatology”

In this randomized, placebo-controlled trial, adults with severe chronic alopecia areata who received deuruxolitinib showed significant hair regrowth compared to placebo over 24 weeks, and the treatment was generally well-tolerated, though long-term effects remain unexamined.

Forecasting Phase 3 Dose-Response for Abrocitinib, an Oral Janus Kinase 1 Selective Inhibitor, Using Investigator’s Global Assessment and Eczema Area and Severity Index

research 170 Forecasting Phase 3 Dose-Response for Abrocitinib, an Oral Janus Kinase 1 Selective Inhibitor, Using Investigator’s Global Assessment and Eczema Area and Severity Index

September 2019 in “Journal of Investigative Dermatology”

In this study, dose-response modeling predicted that once-daily abrocitinib doses of 100 mg and 200 mg may provide a clinically meaningful response in treating moderate-to-severe atopic dermatitis compared to placebo.

research Frontal fibrosing alopecia shows robust T helper 1 and Janus kinase 3 skewing

34 citations , June 2020 in “British journal of dermatology/British journal of dermatology, Supplement”

In this study, researchers observed that follicular damage and stem cell loss in frontal fibrosing alopecia may be mediated by immune attacks at the bulge region, suggesting potential for JAK/STAT-targeting treatments to prevent progression.

research Determination of 13 janus kinase inhibitors in anti-alopecia cosmetics by ultra-high performance liquid chromatography-tandem triple quadrupole composite linear ion trap mass spectrometry

September 2025 in “Chinese Journal of Chromatography”

This study developed a method using ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MRM-IDA-EPI) for the rapid and sensitive detection of 13 JAK inhibitors in anti-alopecia cosmetics, showing excellent separation and accurate quantification with high recovery rates in tested matrices.

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community Is it ok to take Xeljanz (A jak inhibitor) while taking finasteride?

2 upvotes 9 years ago

The conversation is about whether it is safe to take Xeljanz, a JAK inhibitor, while also taking finasteride for hair loss. The concern is that Xeljanz weakens the immune system, which could be risky.

community Novel Formulation To Put An End To Hair Loss Once And For All.

in Research/Science 118 upvotes 10 months ago

A pharmacy student proposed a hair loss treatment using minoxidil, finasteride, clascoterone, and tretinoin, aiming for high effectiveness with minimal side effects. Reactions were mixed, with some questioning its feasibility and others showing interest.

community What else is good. Besides the big 3.

in Chat 35 upvotes 1 year ago

Key treatments for hair preservation include minoxidil, finasteride/dutasteride, and microneedling, with additional options like specific shampoos, oils, biotin, zinc, tretinoin, clascoterone, and low-level laser therapy. Maintaining a healthy lifestyle, reducing stress, and addressing nutrient deficiencies can also support hair health.

community Article of all potential future cures

25 upvotes 1 year ago

Ritlecitinib and PP405 show promise for hair regrowth. Diagnosing the cause of hair loss is crucial before treatment.

community The 2026 Breakthrough Pipeline: Top 5 Mind-Changing Hair Loss Treatments To Watch

1 week ago

New hair loss treatments include lab-grown hair cloning, scarless healing with verteporfin, GT20029 for receptor degradation, JAK inhibitors for follicle activation, and dermal papilla stem cell exosomes. These aim to regenerate hair rather than just slow hair loss.

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learn Tofacitinib

a JAK inhibitor for alopecia areata and other autoimmune conditions

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