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GlossaryIsthmus of Hair Follicle (Isthmus)

region between the infundibulum and bulge area of hair follicle

The isthmus of the hair follicle is a specific region located between the infundibulum (the upper part of the follicle) and the bulge area (where stem cells reside). This section plays a crucial role in the structural integrity and function of the hair follicle, including the anchoring of the hair shaft and the regulation of hair growth cycles.

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research The Transverse Anatomy of Androgenic Alopecia

42 citations , December 1990 in “The Journal of Dermatologic Surgery and Oncology”

The study found that horizontal sections of scalp biopsies are better for analyzing hair loss, showing fewer hairs and more fine hairs in balding areas.

Evaluation of Perifollicular Inflammation of Donor Area During Hair Transplantation in Androgenetic Alopecia and Its Comparison With Controls

research Evaluation of Perifollicular Inflammation of Donor Area During Hair Transplantation in Androgenetic Alopecia and Its Comparison With Controls

13 citations , January 2013 in “International Journal of Trichology”

Inflammation around hair follicles may worsen hair loss; evaluating and treating it can improve transplant results.

research Developmental Timing of Hair Follicle and Dorsal Skin Innervation in Mice

86 citations , May 2002 in “Journal of comparative neurology”

Nerve growth in mouse skin and hair follicles happens in stages and is closely linked to hair development.

research Stress-Induced Production of Chemokines by Hair Follicles Regulates the Trafficking of Dendritic Cells in Skin

286 citations , June 2012 in “Nature Immunology”

Hair follicles help attract immune cells to the skin during stress.

research Matriptase Expression and Zymogen Activation in Human Pilosebaceous Unit

9 citations , September 2013 in “Journal of histochemistry and cytochemistry/The journal of histochemistry and cytochemistry”

Matriptase is highly active in hair follicles and sebaceous glands, especially during hair growth phases.

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community The MPB itch aka DHT itch is very real.

in Chat 9 upvotes 3 years ago

Hair loss itch is caused by DHT attacking follicles and stimulating nerves. Finasteride users who respond well don't experience this itch.

community Microneedling depth. Does one length fit all areas of the scalp? Maybe not.

in Microneedling 55 upvotes 4 years ago

Microneedling depth should be customized based on hair type and scalp area, with many users finding 0.5-0.6mm effective for miniaturized hairs to avoid damage. Users report varying pain levels and results, with some preferring shorter needle lengths and others using longer ones like 1.75mm for scalp health and density improvement.

community Microneedling must reach the stem cells in the upper hair shaft

in Treatment 82 upvotes 4 years ago

Microneedling should target depths of 0.5mm to 1.5mm for hair loss, with weekly sessions at 1mm recommended. Combining microneedling with Minoxidil is common for improved results.

community Quote from Pelage (PP-405) Spokesperson...

in Research/Science 120 upvotes 4 months ago

Pelage is developing a topical hair follicle stem cell therapy, PP405, for non-scarring alopecias like androgenetic alopecia, with Phase III trials planned and a potential market launch by 2027. The treatment may not require continuous use after initial regrowth.

community If You Have DUPA, PLEASE READ THIS: Everyone Should Be Scalp Biopsied

nkrata in Research 830 upvotes 1 year ago

Scalp biopsies are crucial for diagnosing hair loss conditions like Diffuse Unpatterned Alopecia (DUPA) and retrograde hair loss, as treatments like finasteride and dutasteride may not be effective if other conditions are present. Combining PPAR-GAMMA agonists with retinoids could improve treatments for conditions like Lichen Planopilaris.