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Glossary Outer Root Sheath

layer of cells surrounding and supporting the hair follicle

The Outer Root Sheath (ORS) is a layer of cells that surrounds the hair follicle, providing structural support and playing a crucial role in the growth and cycling of hair. It extends from the epidermis down to the hair bulb and is involved in the regeneration of the hair follicle after shedding.

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Research

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research Sex Hormones and Antiandro Growth of Dermal Papilla H ens Influence In Vitro Ce Is and Outer Root Sheath Keratinocytes of Human Hair Follicles

January 1993

This study found that testosterone and dihydrotestosterone significantly decreased the proliferation of papilla cells compared to dermal fibroblasts and outer root sheath keratinocytes in cultured hair follicle cells.

research A new in vitro culture system to produce a fully differentiated epidermis from human hair follicle outer root sheath cells

2 citations , January 1989

This study describes a new tissue culture method that successfully induces outer root sheath cells from hair follicles to differentiate into a multilayered epithelium with characteristics similar to normal interfollicular epidermis.

research Keratins of the human hair follicle: “Hyperproliferative” keratins consistently expressed in outer root sheath cells in vivo and in vitro

135 citations , November 1987 in “Differentiation”

This study found that cultured outer root sheath cells from human hair follicles expressed a keratin profile similar to their in vivo environment, indicating environmental influence on keratin expression.

research Basal cell carcinoma possibly originates from the outer root sheath and/or the bulge region of the vellus hair follicle

107 citations , May 1999 in “Archives of Dermatological Research”

In this study, the immunohistochemical and lectin binding profiles of basal cell carcinoma closely resembled those of the outer root sheath of vellus hair follicles, suggesting a potential histochemical relationship.

research Solid basal cell epithelioma (BCE) possibly originates from the outer root sheath of the hair follicle.

61 citations , August 1993 in “PubMed”

This study found that solid basal cell epitheliomas and the outer root sheath of human hair follicles display nearly identical cytokeratin profiles, suggesting a potential origin connection.

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community Protective effects of taurine on human hair follicle grown in vitro. - PubMed

4 upvotes 7 years ago

Taurine promotes hair survival and protects hair follicles. Users discuss trying topical taurine for hair growth.

community Hair loss research focused on chemistry for decades because we misunderstood the mechanics of growth.

51 upvotes 7 months ago

Hair growth relies on mechanical forces, not just chemicals, with tissue acting like a motor. Minoxidil and finasteride help, but maintaining tissue elasticity and addressing mechanical issues are essential.

community You may not have the enzyme for topical minoxidil to work - a rarely talked about impact

100 upvotes 1 year ago

Some people may not respond to topical minoxidil due to low SULT1A1 enzyme activity, but oral minoxidil can be effective. Tretinoin may enhance minoxidil's effectiveness, and some users prefer oral minoxidil despite side effects.

community IGFBP‐rP1 is a potential therapeutic target in androgenic alopecia

in Research/Science 13 upvotes 1 year ago

IGFBP‐rP1 shows potential for treating androgenic alopecia by influencing hair cycle transitions. Increasing IGF-1 levels may have similar effects to Minoxidil and 5-AR inhibitors in reducing hair loss.

community Study on Sugar Intake on Male Pattern Hair Loss

19 upvotes 3 years ago

Excessive sugar and high-fat diets are linked to male pattern hair loss, with sweet beverages being a significant factor. Moderation in diet is advised, as diet alone may not fully prevent hair loss due to other factors like DHT sensitivity.

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