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Glossary Prolactin Receptor

protein on cell surfaces that binds to prolactin hormone

The Prolactin Receptor (PRLR) is a protein found on the surface of certain cells that binds to the hormone prolactin. This interaction is crucial for various biological processes, including lactation, reproductive functions, and immune system regulation. In the context of hair biology, prolactin and its receptor can influence hair growth and hair cycle regulation.

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Research

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Prolactin and Its Receptor Are Expressed in Murine Hair Follicle Epithelium, Show Hair Cycle-Dependent Expression, and Induce Catagen

research Prolactin and Its Receptor Are Expressed in Murine Hair Follicle Epithelium, Show Hair Cycle-Dependent Expression, and Induce Catagen

91 citations , May 2003 in “American Journal of Pathology”

This study found that prolactin and its receptor are expressed in the murine hair follicle epithelium, influencing hair cycle phases by down-regulating keratinocyte proliferation during anagen and inducing premature catagen.

Prolactin Signaling Influences the Timing Mechanism of the Hair Follicle: Analysis of Hair Growth Cycles in Prolactin Receptor Knockout Mice

research Prolactin Signaling Influences the Timing Mechanism of the Hair Follicle: Analysis of Hair Growth Cycles in Prolactin Receptor Knockout Mice*

73 citations , June 2001 in “Endocrinology”

In this study, researchers found that disrupting the PRL gene in mice led to earlier hair molting, especially in females, suggesting that PRL inhibits murine hair cycle events.

The Prolactin Receptor as a Therapeutic Target in Human Diseases: Exploring New Potential Indications

research The prolactin receptor as a therapeutic target in human diseases: browsing new potential indications

38 citations , June 2015 in “Expert Opinion on Therapeutic Targets”

This review explores potential indications for prolactin receptor inhibitors beyond breast and prostate cancers, emphasizing the need for potent antibodies to further research prolactin receptor expression.

Thyrotropin-Releasing Hormone and Estrogen Differentially Regulate Prolactin and Prolactin Receptor Expression in Female Human Skin and Hair Follicles In Vitro

research Thyrotropin-releasing hormone and oestrogen differentially regulate prolactin and prolactin receptor expression in female human skin and hair follicles in vitro

37 citations , March 2010 in “British Journal of Dermatology”

Oestrogen and thyrotropin-releasing hormone affect prolactin and its receptor in human skin and hair, suggesting new treatment options for related conditions.

research A Neutralizing Prolactin Receptor Antibody Whose In Vivo Application Mimics the Phenotype of Female Prolactin Receptor-Deficient Mice

14 citations , August 2015 in “Endocrinology”

This study describes the development of a monoclonal antibody, 005-C04, which blocks PRLR-mediated signaling, suggesting its potential for furthering understanding of PRLR's role in health and disease.

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Community Join

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community Prolactin the Cause of Hair Loss? ABS-201 the Cure?

29 upvotes 2 months ago

Prolactin may contribute to hair loss, but targeting its receptor won't cure androgenetic alopecia. ABS-201 could be a useful alternative or adjuvant therapy, similar to JAK inhibitors, but not more effective than HMI-115.

community What's going on with hmi115? The Phase 2 was concluded Nov2024 but no news

13 upvotes 9 months ago

Hmi115, a prolactin receptor blocker, showed promise for hair growth, but results from Phase 2 trials have not been published. ABS-201, an AI-based analog, is expected to begin trials in December 2025, while commercialization of treatments like PP-405 is anticipated around 2027.

community ABS-201 KOL Seminar: Dr. Ralf Paus on Human Ex Vivo Hair Regrowth Data

17 upvotes 8 months ago

ABS-201 shows promise for male hair regrowth by blocking the prolactin receptor, with higher expected efficacy than current treatments. The discussion also covers dosing differences between macaques and humans for hmi115, highlighting a significant dosage disparity.

community A New Hair Loss Drug Could Cure Balding and Reverse Graying

367 upvotes 11 months ago

ABS-201, a prolactin receptor blocker, shows promise in reversing hair loss and graying, with early success in macaques. Current treatments like finasteride, minoxidil, and RU58841 are still widely used, but new options like PP405 are eagerly anticipated.

community Ray Peat: Testosterone Isn’t the Culprit, Prolactin and Cortisol Drive Hair Loss (2016)

in Research/Science 110 upvotes 10 months ago

Prolactin and cortisol are identified as key factors in hair loss, with stress hormones impacting hair shedding. Finasteride and minoxidil are effective treatments, while DHT's role and individual sensitivity are significant factors.

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Learn

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learn HMI-115

much-hyped research compound targeting prolactin receptor in scalp

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.
What is HMI-115 and how is it different from common treatments like minoxidil? HMI-115 (BAY 1158061) is an investigational monoclonal antibody that blocks the prolactin receptor, not a GnRH antagonist. It is given by injection in trials and is not approved anywhere; minoxidil is an approved topical vasodilator with decades of published data, while HMI-115's hair-loss trial results remain unpublished.

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