10 citations
,
January 2009 in “Elsevier eBooks” This review discusses the structure, functions, and growth cycle of human hair, emphasizing its reduced growth and protective roles, and reports no new research findings.
62 citations
,
March 2008 in “American Journal of Human Genetics” This study located a potential genetic link for androgenetic alopecia on chromosome 3q26, marking an early step in identifying new susceptibility genes for male pattern baldness.
102 citations
,
February 2008 in “The FASEB Journal” This study found that human hair follicles express ATP-sensitive potassium channels, suggesting that minoxidil acts on these channels and that drugs targeting them may treat hair disorders.
502 citations
,
February 2008 in “The Journal of Clinical Endocrinology & Metabolism” This review discusses hirsutism management guidelines, recommending androgen testing only for women with abnormal hirsutism scores and advocating for combined therapy approaches depending on severity and underlying conditions, but it reports no new clinical results.
39 citations
,
January 2008 in “Journal of Endocrinology” This study found that in androgenetic alopecia, reduced stem cell factor production by dermal papilla cells may lead to decreased pigmentation in hair follicles.
171 citations
,
July 2007 in “Journal of Investigative Dermatology” The researchers reported that DHT-inducible DKK-1 may play a significant role in DHT-driven balding by inhibiting hair follicle cell growth and promoting apoptosis in androgenetic alopecia.
35 citations
,
March 2007 in “Skin Research and Technology” In this study, researchers developed a non-invasive method to distinguish exogen hair from telogen hair on the human scalp, finding that normal exogen hair levels are generally less than seven hairs per cm².
98 citations
,
February 2007 in “Seminars in Cell & Developmental Biology” This review explores the hormonal regulation of hair growth and changes with season, age, and sexual development, and calls for improved treatments for hair disorders.
215 citations
,
November 2006 in “Journal of The American Academy of Dermatology” This study found that dutasteride increased scalp hair growth in men with male pattern hair loss, particularly at a 2.5 mg dose, and was more effective than finasteride over 24 weeks.
85 citations
,
October 2006 in “Current opinion in cell biology” This article reviews advances in feather development and regeneration, including pattern formation, stem cell biology, and evolution, but presents no new experimental results.
159 citations
,
July 2006 in “Endocrine Reviews” This article discusses the influence of estrogens on hair follicle growth and metabolism, suggesting a significant role alongside androgens in hair growth control but reports no new clinical results.
41 citations
,
June 2006 in “Journal of Investigative Dermatology” This study identified three genes with significantly higher expression in androgen-sensitive beard dermal papilla cells compared to androgen-insensitive scalp cells, suggesting potential novel signaling pathways in hair follicles.
65 citations
,
May 2006 in “Journal of Investigative Dermatology” This study found that dexamethasone significantly reduced ERα mRNA levels and increased aromatase mRNA and activity in cultured human hair follicle dermal papilla cells, suggesting a glucocorticoid-dependent mechanism for estradiol action.
128 citations
,
March 2006 in “American Journal of Pathology” The study found that prolactin expressed in human scalp hair follicles acts as an autocrine modulator, inhibiting hair growth and promoting hair follicle regression, which may contribute to hair loss in hyper-prolactinemia patients.
51 citations
,
November 2005 in “Journal of Medical Primatology” This study observed that hair loss in captive rhesus macaques varies with season, sex, and housing conditions, and is significantly correlated with HPA axis activity as indicated by faecal cortisol metabolites.
74 citations
,
April 2005 in “Dermatologic Clinics” This article reviews treatment options for male-pattern and female-pattern hair loss, telogen effluvium, and alopecia areata, but provides no new clinical results; algorithmic management approaches are included.
35 citations
,
March 2005 in “Journal of Investigative Dermatology” In this in vitro study, minoxidil, diazoxide, and the novel compound NNC 55-0118 increased hair follicle growth, supporting deer follicles as a viable bioassay for ATP-sensitive potassium channel modulators.
92 citations
,
February 2005 in “Endocrinology” This study found that estrogen receptor beta plays a significant role in murine hair growth control, potentially acting as a silencer of estrogen receptor alpha's catagen-promoting effects.
48 citations
,
December 2004 in “Differentiation” This study found that cultured dental papilla cells from various mammals can induce hair follicle regeneration and influence tissue formation, with outcomes dependent on donor age, tooth type, and host environment.
47 citations
,
July 2004 in “Journal of Dermatological Science” In this study, decreased expression of BMP2 and ephrin A3 and increased NT-4 gene expression were observed in dermal papilla cells from androgenic alopecia-affected skin, suggesting potential roles in hair growth regulation.
49 citations
,
March 2004 in “Journal of Investigative Dermatology” This study found that the hHa7 gene in hair follicle trichocytes is the first identified to have its expression directly regulated by androgens, suggesting it as a marker for androgen action on hair follicles.
44 citations
,
March 2004 in “Journal of Investigative Dermatology” This study observed that in vitro treatment of male frontotemporal scalp hair follicles with 17-β-estradiol stimulated hair shaft generation and hair matrix keratinocyte proliferation, suggesting potential anagen-prolonging effects.
51 citations
,
January 2004 in “Domestic animal endocrinology” This study concluded that an endogenous circannual rhythm of prolactin secretion in mouflon influences their seasonal hair growth and moulting cycle, which varies under different photoperiodic and melatonin treatments.
9 citations
,
November 2003 in “Journal of Investigative Dermatology” This study found an association between low serum ferritin levels and alopecia in women, suggesting a potential role of iron in hair health and paving the way for further research.
49 citations
,
August 2003 in “Journal of The American Academy of Dermatology” Higher IGF-1 levels in hair follicles link to better finasteride results for hair loss.
45 citations
,
June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” This review discusses various in vitro and in vivo models for studying hair follicle function, noting their potential in developing new treatments for hair disorders but reports no new results.
277 citations
,
June 2003 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” This article reviews the role of epithelial-mesenchymal interactions in hair follicle morphogenesis and the hair cycle, suggesting potential paths for developing treatments for hair growth disorders but providing no new clinical findings.
190 citations
,
October 2002 in “The FASEB journal” In this study, androgen did not affect keratinocyte growth in coculture with androgenetic alopecia-derived dermal papilla cells, but did significantly suppress keratinocyte growth when androgen receptor was overexpressed in the papilla cells.
107 citations
,
September 2002 in “Journal of Investigative Dermatology” This study identified a distinct "exogen" phase in the hair cycle during which hair shedding occurs, primarily coupled with the anagen phase, rather than as part of the telogen phase.
211 citations
,
October 2001 in “The FASEB Journal” This study found that the BMP antagonist noggin induces hair growth in postnatal skin by neutralizing BMP4's inhibitory activity, potentially mediated by changes in Shh expression.
66 citations
,
August 2001 in “Experimental Dermatology” This study demonstrated that intact adult human dermal papillae can induce hair growth when implanted into mouse hair follicles, highlighting their potential for advancing hair follicle biology and therapeutic approaches.
24 citations
,
March 2001 in “Journal of Endocrinology/Journal of endocrinology” In this study, androgen receptors were found only in the mane follicles of red deer stags during the breeding season, suggesting their expression is induced by seasonal hormone changes.
11 citations
,
January 2001 in “Cambridge University Press eBooks” This article discusses cultural significance and psychological effects of hair growth variations but provides no new clinical findings.
71 citations
,
February 2000 in “Endocrinology and metabolism/American journal of physiology: endocrinology and metabolism” This study found that topical estradiol inhibits hair growth in mice by preventing the hair follicle's transition from resting to growth phase, a process reversible with an estrogen receptor antagonist.
231 citations
,
December 1999 in “Journal of Investigative Dermatology” This study found that the volume of a hair follicle's dermal papilla is strongly correlated with its size, primarily due to the number of cells it contains and the volume of extracellular matrix.
32 citations
,
December 1999 in “Journal of Investigative Dermatology Symposium Proceedings” This study found that the effectiveness of 17-beta-estradiol in inhibiting hair growth depends on its application method, and noted significant sex differences in response to 17-alpha-estradiol in male and female mice.
63 citations
,
November 1999 in “British journal of dermatology/British journal of dermatology, Supplement” This study observes the expression of mRNA for androgen receptor, 5α‐reductase, and 17β‐hydroxysteroid dehydrogenase in human dermal papilla cells.
27 citations
,
September 1999 in “Journal of Investigative Dermatology” This study found that protease nexin-1 mRNA is expressed in human dermal papilla cells and is downregulated by dihydrotestosterone in balding scalp, suggesting a role in male-pattern baldness progression.
51 citations
,
November 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” In this study, researchers found that while both beard and scalp dermal papilla cells release similar autocrine growth factors, only beard cells increased production and response with testosterone, suggesting these factors enhance androgen-induced hair growth.
581 citations
,
October 1998 in “Journal of The American Academy of Dermatology” In male pattern hair loss, this study found that finasteride 1 mg daily significantly slowed hair loss and increased hair growth over two years compared to placebo.
227 citations
,
January 1998 in “Journal of Endocrinology” This study found that dermal papilla cells from balding scalp hair follicles have significantly higher levels of androgen receptors than those from non-balding follicles, supporting their in vivo androgen response.
74 citations
,
January 1998 in “Dermatology” This study reported that men with more significant hair loss experience greater negative psychosocial effects, particularly noticeable in younger age groups.
55 citations
,
July 1997 in “Clinical Endocrinology” This study found that administering growth hormone to adult men with GH deficiency increased their sexual hair scores, suggesting an auxiliary effect on androgen action in the skin.
33 citations
,
January 1997 in “Endocrinology” Testosterone was found to inhibit hair follicle epithelial cell proliferation in adult stumptailed macaques only when dermal papilla cells from bald scalps were present, and this effect was reversed by the antiandrogen RU 58841.
154 citations
,
October 1996 in “Proceedings of the National Academy of Sciences of the United States of America” This study found that 17-beta-estradiol inhibits hair growth in mice by blocking hair follicles in the telogen phase, whereas an estrogen receptor antagonist promotes hair growth by initiating anagen.
30 citations
,
March 1996 in “British Journal of Dermatology” 173 citations
,
July 1995 in “Biochemical and biophysical research communications” This study suggests that IGF-I may mediate androgen-induced hair growth in outer root sheath cells cocultured with beard dermal papilla cells.
157 citations
,
April 1994 in “Clinical endocrinology” Androgens can cause hair growth in some areas and hair loss on the scalp.
101 citations
,
April 1994 in “Baillière's clinical endocrinology and metabolism” This review discusses the role of 5α-reductase enzymes in androgen action and related disorders, noting that their specific inhibitory drugs show promise for conditions like benign prostatic hypertrophy; it reports no new clinical results.
124 citations
,
April 1992 in “Journal of Endocrinology/Journal of endocrinology” This study observed that cells from androgen-sensitive areas like the beard and scrotum showed higher androgen receptor levels compared to those from non-balding scalp areas, supporting the role of dermal papilla in follicle growth responses to androgens.
85 citations
,
January 1991 in “Journal of Investigative Dermatology” 29 citations
,
February 1987 in “General and comparative endocrinology” This study found that in male badgers, seasonal molting and hair growth are influenced by cycles of plasma testosterone and thyroxine, with hormones affecting the timing and progression of these processes.
48 citations
,
April 1982 in “Clinics in Plastic Surgery” Male pattern baldness is common and can be managed with early intervention.
666 citations
,
September 1977 in “British Journal of Dermatology” This article presents a classification system for stages of female-pattern androgenetic alopecia to aid early diagnosis and mentions existing systems for rare male-pattern cases, but reports no new clinical results.
63 citations
,
October 1972 in “British Journal of Dermatology” Women with thinning hair have thinner hair strands than women without hair loss.
46 citations
,
April 1971 in “American Journal of Clinical Nutrition” Lack of protein causes hair root damage, but it can be reversed by eating protein again.
39 citations
,
October 1967 in “British Journal of Dermatology” Hair loss in women often doesn't follow a pattern, isn't linked to age, may be genetic, and can be related to thyroid issues or other health factors.
521 citations
,
January 1954 in “Physiological Reviews” Hair growth is cyclic and influenced mainly by local factors.