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Glossary Epithelial Sac

small, enclosed structure of epithelial cells around hair follicle

An epithelial sac is a small, enclosed structure composed of epithelial cells, which are cells that line the surfaces and cavities of the body. In the context of hair biology, an epithelial sac can refer to the structure that surrounds the developing hair follicle, playing a crucial role in the formation and growth of hair. This sac provides a protective environment and supplies necessary nutrients to the growing hair shaft.

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Research

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research Treatment of Acne Scar Contraction Using Autologous Cultured Epithelial Sheet Transplantation: A Report of Four Cases

July 2025 in “Cureus”

This study found that grafting an autologous cultured epithelial sheet improved both scarring and skin texture in four patients with acne-associated scar contracture three months post-treatment, suggesting the technique might effectively treat difficult acne scars by metabolizing excess collagen.

Nestin as a Marker of Unipotent Epithelial Progenitor Cell Differentiation into Outer Root Sheath Keratinocytes in Embryonic and Adult Hair Follicles

research Nestin as a marker of unipotent epithelial progenitor cell differentiation into outer root sheath keratinocytes in embryonic and adult hair follicles

May 2022 in “Research Square (Research Square)”

This study found that nestin-expressing unipotent progenitor cells capable of differentiating into outer root sheath keratinocytes are present during hair follicle development and in adult hair follicles.

research Epithelial–mesenchymal transition in keloid tissues and TGF‐β1–induced hair follicle outer root sheath keratinocytes

46 citations , July 2015 in “Wound repair and regeneration”

This study found that keloid tissues exhibit epithelial-mesenchymal transition-related changes and alterations in gene expression, implicating these processes in the pathogenesis of keloids.

research K6irs1, K6irs2, K6irs3, and K6irs4 Represent the Inner-Root-Sheath-Specific Type II Epithelial Keratins of the Human Hair Follicle1

130 citations , April 2003 in “Journal of Investigative Dermatology”

This study reports the cloning and expression details of two new human type II keratins, K6irs3 and K6irs4, in the hair follicle's inner root sheath, suggesting a distinct functional role related to hair structure.

research A Novel Epithelial Keratin, hK6irs1, is Expressed Differentially in All Layers of the Inner Root Sheath, Including Specialized Huxley Cells (Flügelzellen) of the Human Hair Follicle

86 citations , May 2002 in “Journal of Investigative Dermatology”

This study characterized a new human keratin, hK6irs1, specifically found in the inner root sheath of hair follicles, which suggests its role in the structural integrity and guidance of growing hair shafts.

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Community Join

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community Hair cloning breakthrough, this might just be the big one ?

418 upvotes 6 months ago

Japanese scientists discovered ABM cells, enabling successful human hair follicle cloning, potentially curing hair loss. The treatment may be available in Japan by 2028, but it will be expensive and require travel.

community Best science-backed supplements for androgenetic alopecia? Looking for real evidence

7 months ago

The conversation discusses treatments for androgenetic alopecia, focusing on evidence-based supplements to complement finasteride. Suggestions include oral minoxidil, saw palmetto, pumpkin seed oil, tocotrienols, and various other supplements, while emphasizing the importance of scientific backing and cautioning against saw palmetto if already using finasteride.

community Are these supplements good enough or am I missing something?

1 year ago

The conversation discusses the effectiveness of various supplements for hair loss, with some users suggesting higher doses of Zinc and Vitamin C, while others recommend additional supplements like Saw Palmetto and Omega-3. It is concluded that multi-vitamins are often ineffective unless there is a deficiency, and excessive intake can harm hair follicles.

community Everything you ever wanted to know about Pelage Pharma's PP405: how it works and what to expect

126 upvotes 3 months ago

PP405 may encourage earlier hair growth and slightly increase visible hair count but does not reverse hair follicle miniaturization in male pattern baldness. It does not address damage to the dermal papilla or broken Wnt signaling.

community DHT Isn’t the Only Factor in Hair Loss and That Might Be the Key to a Real Cure

373 upvotes 6 months ago

Hair loss involves more than just DHT, with genetic factors like TRPS affecting hair follicles. Treatments such as Amplifica's AMP-601 and AMP-303 target stem cells for potential hair growth solutions.

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Learn

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learn Hair Multiplication

extract, clone, and reinsert your own hair cells

learn Epidermal Growth Factor

learn Overview

learn Osteopontin

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

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Experts

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