July 2025 in “Journal of Investigative Dermatology” Wnt and SHH pathways help form hair follicles by coordinating cell processes.
112 citations
,
September 2021 in “BMC Biology” Key genes and factors crucial for hair follicle development and wool traits in Merino sheep were identified.
11 citations
,
January 1997 in “Skin Pharmacology and Physiology” A certain inhibitor can slow down the decrease in DNA creation in mouse hair follicles, which might help with hair growth.
211 citations
,
April 2013 in “Development” More dermal papilla cells in hair follicles lead to larger, healthier hair, while fewer cells cause hair thinning and loss.
February 2026 in “International Journal of Molecular Sciences” PDLLA filler can improve hair thickness and shine by reducing age-related hair decline.
100 citations
,
May 2006 in “American Journal Of Pathology” Matriptase is crucial for skin barrier, hair growth, and may contribute to skin cancer.
15 citations
,
December 2013 in “Clinical Cosmetic and Investigational Dermatology” MAGP-1 decreases with age, leading to weaker, sagging skin.
4 citations
,
November 2021 in “Frontiers in Cell and Developmental Biology” Aging causes hair loss and graying due to stem cell decline and changes in cell behavior and communication.
May 2019 in “The journal of investigative dermatology/Journal of investigative dermatology” Age-related hair loss is linked to the decline and dysfunction of hair follicle stem cells.
January 1992 in “Proceedings of the New Zealand Society of Animal Production” Ferret hair growth starts between 0 and 4 days after melatonin treatment, with cell growth peaking in the hair germ and declining as the hair matures.
26 citations
,
March 2001 in “PubMed” Men's fertility and sexual health decline with age, with reduced testosterone and virility, and many lose fertility by their eighties.
January 2001 in “亚洲男性学杂志:英文版” Men's fertility and sexual health decline with age, but some remain fertile into their eighties.
April 2018 in “Journal of Investigative Dermatology” Older hair follicle stem cells have a reduced ability to renew themselves, leading to more hair loss.
172 citations
,
May 2018 in “Nature” Mammalian organs regenerate using stem cells and cell plasticity, but this ability declines with age.
10 citations
,
October 2020 in “Frontiers in Cell and Developmental Biology” Wounds can regenerate hair in young mice, but this ability declines with age, offering insights for improving tissue regeneration in the elderly.
56 citations
,
December 2010 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair follicle cells age faster and lose pigment due to less catalase, causing hair to turn gray.
35 citations
,
May 2011 in “Experimental Dermatology” Aging causes changes in hair follicles, leading to weaker hair growth.
11 citations
,
October 1997 in “British Journal of Dermatology” Wool follicles grew fibres for 8-10 days in a serum-free culture, influenced by calcium, glucose, amino acids, and insulin.
149 citations
,
July 2014 in “Cold Spring Harbor Perspectives in Medicine” The dermal papilla is crucial for hair growth and health, and understanding it could lead to new hair loss treatments.
73 citations
,
August 2011 in “Stem Cell Research” Human hair follicle stem cells can turn into multiple cell types but lose some of this ability after being grown in the lab for a long time.
40 citations
,
November 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” S100A3 protein is crucial for hair shaft formation in mice.
37 citations
,
January 2010 in “Journal of Clinical Investigation” N-WASP is essential for normal hair growth in mice.
17 citations
,
May 2021 in “Journal of Cell Science” N1-acetylspermidine promotes hair follicle stem cell self-renewal.
11 citations
,
October 2018 in “The Journal of Dermatology” Decorin helps keep hair follicle stem cells and may prevent age-related hair loss.
9 citations
,
July 2013 in “Experimental Dermatology” Aging reduces the ability of human hair follicle cells to form new cell colonies.
6 citations
,
July 2016 in “Cell cycle/Cell cycle (Georgetown, Tex. Online)” Younger mice's hair-follicle stem cells are better at turning into heart cells than older mice's.
TLR2 helps control hair growth and regeneration, and its reduction with age or obesity can impair hair growth.
July 2024 in “Journal of Investigative Dermatology” Taxane chemotherapy can cause permanent hair loss by damaging hair follicles and altering their DNA.
December 2024 in “Minia Journal of Medical Research” White hair in alopecia areata may be linked to reduced Sox10 expression.
4 citations
,
July 2014 in “Journal of Investigative Dermatology” Old people have less hair because their hair follicles don't regenerate as well, not because of fewer stem cells, and a protein called follistatin might help reactivate hair growth.