September 2026 in “Stem Cell Reviews and Reports” Bulge progenitor cells show promise for regenerating hair follicles and increasing hair density.
April 2010 in “Cancer Research” In this study, Stat3 activation in transgenic mice led to a decrease in stem cells in the hair follicle bulge, suggesting its crucial role in epidermal growth and stem cell maintenance.
May 2025 in “International Journal of Trichology” This study found that partially bald scalps of Indian men with androgenic alopecia retain progenitor cells marked by CD34 and Sox9, but these cells are absent in completely bald areas, suggesting that interventions might be more effective if focused on early-stage hair loss.
September 2023 in “bioRxiv (Cold Spring Harbor Laboratory)” This study observed that while some progenitor cells were present in the partially bald areas of androgenic alopecia in Indian men, the completely bald areas lacked these cells, suggesting potential timing for therapeutic intervention targeting hair follicle stem cell activity.
October 2009 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” This study demonstrates that using a K15 promoter-driven GFP labeling technique allows for the identification and characterization of epithelial stem cells in adult human hair follicles.