Cholesterol Promotes Hair Growth by Activating Sympathetic Nerves and Enhancing Hair Follicle Stem Cell Proliferation

This study examines the role of hair follicle stem cells in epidermal regeneration during skin soft tissue expansion, proposing a potential method for their cellular and molecular regulation.

This study reviews the regulatory mechanisms and molecular processes governing stem cell activity in hair follicles, highlighting their roles in hair regeneration and potential implications for treating hair and skin disorders.

This review examines the mechanisms of hair follicle development and regeneration, discussing current hair loss treatments and emerging therapies like low-level laser therapy and stem cell therapy, which the authors suggest show promise in managing hair loss.

This research emphasizes the importance of understanding patient experiences related to hair loss, highlighting that race, ethnicity, culture, resources, and mental health greatly affect these experiences. Effective counseling involves clear communication, validation, and shared decision-making to provide appropriate treatment, support, or camouflage options.

This continuing medical education article outlines the comprehensive approach needed to diagnose alopecia, emphasizing the importance of a thorough history, scalp and hair examination, and, if necessary, laboratory analysis and biopsy for effective treatment planning.

In this study, researchers found that knockdown of ABCA5 in primary human hair follicle keratinocytes disrupted cholesterol homeostasis and transportation, suggesting its potential role in hair growth disorders by affecting intracellular cholesterol compartmentalization and LXR-mediated transcriptional activity.

This article reviews treatment options for female-pattern hair loss, noting the limited evidence for most therapies and emphasizing that topical minoxidil remains the only well-supported option despite a significant non-response rate.

In this study, adding CCL2 protein to organoid cultures helped adult skin cells regain the ability to self-organize and regenerate hair follicles, suggesting potential therapeutic applications.

This review discusses recent advancements in understanding how the sympathetic nervous system and norepinephrine regulate hair follicle growth, highlighting innovative studies that explore their effects on hair follicle stem cells.

This study found that androgenetic alopecia is significantly associated with moderate impairment of health-related quality of life and emotions, but not with depressive symptoms.

This study found that melatonin may enhance goat cashmere growth by activating Wnt signaling and regulating stem cell pluripotency through mechanisms involving NOGGIN and BMP4 pathways.

This study found that human hematopoietic mesenchymal stem cells increased the viability and migration of human outer root sheath cells in an in vitro alopecia areata model, involving Wnt/β-catenin and JAK/STAT pathways.

In this study, increased corticosterone from chronic stress prolonged hair follicle stem cell quiescence in mice, inhibiting regeneration, but restoring Gas6 expression overcame this inhibition.

This study found that dihydrotestosterone induced hair loss and changes in hair morphology in male C57BL/6 mice, effects that could be partially reversed by the AR antagonist bicalutamide.

In this study, human hair follicles showed varying expression of cholesterol transport proteins during the hair cycle, suggesting a potential role of cholesterol in hair growth and cycling.

In this study, researchers found that SIRT7 activates quiescent hair follicle stem cells to promote hair growth in mice by triggering the telogen-to-anagen cycle transition, with potential implications for age-related hair loss.

This study found that sympathetic nerves and arrector pili muscles form a niche that modulates hair follicle stem cell activity, revealing their role in hair follicle regeneration.

This study explored the complex roles of niche cells in regulating hair follicle stem cells, identifying specific cell functions such as signaling, sensing, and relaying messages, which could provide insights into treating hair loss conditions like androgenetic alopecia and alopecia areata.

In this study using a mouse model and human hair follicle cells, shikimic acid was found to promote hair growth and may serve as a new therapeutic agent for alopecia.

This study found that Oncostatin M, via JAK-STAT5 signaling, keeps hair follicle stem cells inactive, and its removal leads to hair growth initiation in mice.

This review discusses the safety concerns associated with new treatments for non-scarring alopecias, highlighting that while these therapies such as JAK inhibitors and oral minoxidil show efficacy in hair regrowth, their safety profiles vary significantly, requiring careful consideration of benefits and risks.

This review highlights the potential of ginseng and its metabolites in preventing hair loss, detailing their hair growth-promoting effects observed in numerous preclinical studies, and emphasizing the underlying mechanisms involved.

This study found that light stimulation of intrinsically photosensitive retinal ganglion cells in the eyes can activate hair follicle stem cells through a neural circuit involving the sympathetic nervous system.

This study found that young men with early-onset androgenetic alopecia have a worse glycolipid profile and hormone pattern similar to women's PCOS, suggesting a possible male PCOS-equivalent syndrome.

This review discusses current and emerging therapeutic strategies for androgenetic alopecia, noting limited evidence but suggesting areas such as prostaglandin analogs, PRP, and progenitor cell therapies as promising future directions.

This study found that epidermal growth factor significantly enhances the proliferation of hair follicle-derived mesenchymal stem cells through the EGFR/ERK and AKT pathways, without involving the STAT3 pathway.

In this study, researchers found that impaired cholesterol biosynthesis in hair follicles may trigger an inflammatory immune response linked to primary cicatricial alopecia, providing new insights into the disorder's pathogenesis.

This study found that the prevalence of androgenetic alopecia in Chinese men was lower than in Caucasian men, similar to Korean men, and most commonly presented as type III vertex.

This review discusses neural mechanisms involved in hair growth control, focusing on piloneural interactions, but reports no clinical findings; the authors suggest further exploration for managing hair growth disorders.

This study found that treating neonatal mice with the neurotoxin 6-OHDA resulted in temporary hair loss and thinner skin compared to control mice, linking sympathetic neurons to hair growth and skin thickness.