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research Chemotherapy-Induced Alopecia Beyond Cytotoxicity: Hair Follicle Immune Privilege Collapse and JAK-STAT Signaling

May 2026 in “International Journal of Molecular Sciences”

This review highlights emerging evidence that chemotherapy-induced alopecia may be driven by immune mechanisms similar to alopecia areata, involving hair follicle immune privilege collapse, and evaluates Janus kinase inhibitors as potential treatments, while cautioning about their immunosuppressive risks in cancer patients.

research 061 Selective inhibition of tyrosine kinase 2 prevents and restores interleukin-12-induced hair follicle immune privilege collapse: a novel approach to alopecia areata therapy?

October 2021 in “Journal of Investigative Dermatology”

This study found that interleukin-12 signals play a role in hair follicle immune privilege collapse in ex vivo alopecia areata models, and a TYK2 inhibitor may help prevent or reverse this process.

research Baricitinib-Induced Remission of Alopecia Universalis in a Child with NFKB2-Associated Immune Dysregulation

2 citations , January 2025 in “Journal of Clinical Immunology”

research 63418 JAK3/TEC kinase pathways are active in alopecia areata lesions, and their inhibition with Ritlecitinib prevents αCD3/αCD28+IL-2 induced immune privilege collapse in healthy hair follicles ex vivo

September 2025 in “Journal of the American Academy of Dermatology”

Ritlecitinib may help treat alopecia areata by protecting hair follicles.

research Lessons from TNF-α Inhibitor–Induced Alopecia Areata: Does TNF-α Operate as a Hair Follicle Immune Privilege Guardian under Inflammatory Conditions?

2 citations , June 2025 in “Journal of Investigative Dermatology”

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Community Join

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community Microneedling-induced shedding after 5 months?

in Progress Pictures 22 upvotes 10 months ago

A user experienced significant hair loss after starting microneedling, despite using dutasteride and topical minoxidil. They are advised to consult a doctor as the shedding pattern is unusual and may indicate alopecia areata or other scalp conditions.

community My Theory Of Androgenic Alopecia

16 upvotes 9 months ago

Hair loss is linked to cellular physiology and the IGF-1 to TGF-B1 ratio, not just androgen sensitivity. The theory lacks evidence, while finasteride and minoxidil are effective treatments.

community The Real Cause Of Androgenetic Alopecia

675 upvotes 1 year ago

Androgenetic alopecia is caused by DHT affecting hair growth. Finasteride and minoxidil are used to manage hair loss by blocking DHT and promoting hair growth.

community DHT Harms Scalp Microbiome: DHT Itch is REAL

413 upvotes 1 year ago

Increased Malassezia and Cutibacterium in the scalp microbiome are linked to higher sebum production and inflammation in androgenetic alopecia (AGA). Treatments include ciclopirox shampoo, benzoyl peroxide shampoo, clobetasol propionate, calcipotriol, minoxidil, finasteride, and dutasteride.

community Hair loss after COVID or vaccination isn’t “made up” but it’s also not what TikTok makes it sound like

2 upvotes 8 months ago

COVID and COVID vaccination can trigger hair loss, primarily telogen effluvium, due to stress and immune system activation. Proper diagnosis and addressing factors like nutrition and stress are crucial for recovery.

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Learn

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learn Alopecia Areata

autoimmune disorder causing patchy hair loss

learn Osteopontin

signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss

learn Tofacitinib

a JAK inhibitor for alopecia areata and other autoimmune conditions

What is tofacitinib, and why is it discussed in relation to autoimmune-related hair loss such as alopecia areata? Tofacitinib is a prescription JAK inhibitor approved for rheumatoid arthritis, psoriatic arthritis and ulcerative colitis — not for alopecia areata. It is discussed for hair loss because a 2014 case report and a 2016 open-label trial reported regrowth in severe alopecia areata, but that use is off-label, the regrowth relapsed after stopping, and the drug carries an FDA boxed warning.

learn Baricitinib

Baricitinib: How did a drug for arthritis end up helping people regrow hair from alopecia areata? Baricitinib helps regrow hair by targeting the autoimmune response in alopecia areata.

learn Baicapil

Struggling with patchy hair loss like alopecia areata? Baicapil might help by reducing inflammation and reactivating growth. There is no published trial of Baicapil in alopecia areata. The anti-inflammatory and hair-density claims come from the ingredient's manufacturer and from laboratory work on its plant extracts, in people with androgenetic-type hair loss rather than autoimmune patchy hair loss.

learn HMI-115

HMI-115: Frequently Asked Questions About Hair Loss Treatment HMI-115 is an investigational anti-prolactin-receptor antibody being trialled for androgenetic alopecia. It is not approved anywhere; its hair-loss evidence is a 16-person Phase 1b announced only by press release, plus a completed 192-man Phase 2 in China whose results are not yet published.

learn Valproic acid

an anticonvulsant repurposed for hair loss via histone inhibition

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