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Curr Biol 2003 Feb 18;13(4):333-8

Notch/RBP-J Signaling Regulates Epidermis/Hair Fate Determination of Hair Follicular Stem Cells.


Notch signaling is involved in the cell fate determination of various cell lineages. Notch interaction with its ligand induces the cleavage of its intracellular domain (IC), and the Notch IC translocates to the nucleus and binds to RBP-J to transactivate transcription of target genes. All four Notches in mammals bind to RBP-J to exert their transactivation activities. Notch is expressed in developing or differentiating epidermis and hairs, inhibits the terminal differentiation of the epidermis, and regulates hair differentiation. The common stem cells that reside in the upper portion of hair follicles (the bulge) contribute to epidermal and hair cell formation. However, it is unknown what determines whether hair follicular stem cells will become hairs or epidermis. Here we report that conditionally disrupting the mouse RBP-J gene in a mosaic pattern to avoid embryonic lethality of RBP-J-deficiency caused hair loss, epidermal hyperkeratinization, and epidermal cyst formation. Cyst formation is probably due to a combination of the aberrant fate determination of RBP-J-deficient stem cells to epidermal progenitors and their accelerated differentiation into epidermis. These results suggest that Notch/RBP-J signaling regulates the cell fate determination of hair follicular stem cells at the bulge region.


Kaohsiung J Med Sci 2002 Aug;18(8):379-85

Finasteride in the treatment of Taiwanese men with androgenetic alopecia: a 12-month open-label study.


Finasteride 1 mg/day is effective in the treatment of androgenetic alopecia (AGA). Our open-label study assessed the efficacy and safety of finasteride for the treatment of Taiwanese men with AGA. We enrolled 34 Taiwanese men (aged 18-40 yr) with AGA of modified Norwood/Hamilton scale (MNHS) grade II-V. In investigator assessments at 12 months, five of 21 subjects (23.8%) had two-grade improvement in MNHS grade and 12 of 21 subjects (57.1%) had one-grade improvement; the others remained at the same grade. In global photographic evaluation, five of 31 subjects (15.1%) had observable hair growth at 6 months and 11 of 21 subjects (52.4%) had observable hair growth at 12 months. Patient self-assessment of hair growth was favorable across all questions in the treatment course, more significantly at 12 months than at 6 months; nine of 21 subjects (42.9%) were satisfied with their overall appearance at 12 months. Serum prostate specific antigen levels had decreased by 23.4% at 12 months. Adverse effects, including abnormal liver function (5/34), were minimal, and the causal relationship with finasteride could not be established. Thus, in Taiwanese men with AGA, finasteride 1 mg/day for 1 year slowed the progression of hair loss and increased hair growth.


J Am Acad Dermatol 2002 Dec;47(6):856-62

Primary follicular mucinosis: long-term follow-up of patients younger than 40 years with and without clonal T-cell receptor gene rearrangement.


Since the original descriptions of follicular mucinosis, accumulating experience shows that patient age, distribution of lesions, and duration or extent of disease do not reliably distinguish benign primary follicular mucinosis from secondary follicular mucinosis, associated with cutaneous lymphoma. More recently, it has been suggested that individuals with follicular mucinosis demonstrating a clonal T-cell receptor gene rearrangement may be at higher risk for the development of lymphoma. Long-term follow-up of 7 patients younger than 40 years with primary follicular mucinosis are reported. In all cases, there was no clinical or histologic evidence of associated dermatoses or lymphoma at the time of diagnosis. Five of the patients have clonal T-cell gene rearrangement as determined by Southern blot analysis. Clinically, at the time of diagnosis, lesions of primary follicular mucinosis ranged from papules confined to the face to widespread cutaneous plaques. After a mean follow-up of 10 years (range, 5-23 years) from the onset of disease, the majority of patients continue to have cutaneous manifestations of follicular mucinosis despite various treatments. There is no evidence of progression to cutaneous T-cell lymphoma in any patient despite the presence of a clonal T-cell receptor gene rearrangement. Continued prolonged follow-up of patients with clonal primary follicular mucinosis is necessary to determine the significance of infiltrates harboring a T-cell receptor gene rearrangement. However, in our experience with this group of selected patients, primary follicular mucinosis has been a clonal disorder with limited or "benign" cutaneous manifestations.


Skin Res Technol 2002 May;8(2):106-11

Contrast enhanced phototrichogram pinpoints scalp hair changes in androgen sensitive areas of male androgenetic alopecia.


BACKGROUND/AIM: In male androgenetic alopecia (AGA), global changes of scalp hair observed on many years are the cumulative result of discrete changes. Such changes reflect structural and/or functional modifications occurring at the level of individual hair follicles. The patterning of scalp hair loss is the phenotypic expression of clusters of hormone sensitive follicles located in specific scalp areas.The aim of this study was to evaluate, in 21 untreated male subjects with AGA, the relation between various hair measurements using a new validated photographic method with clinical staging (modified Norwood-Hamilton scale) as compared with five controls. METHODS: As recently demonstrated by comparison with transverse sectioning of scalp biopsies, dynamic changes occurring at the level of individual hair follicles can be accurately explored with the contrast enhanced phototrichogram technique (CE-PTG). This is a further improvement of the PTG (combined analysis of two photographs taken at 48 h interval) using contrast enhancement together with the scalp immersion proxigraphy method. Visible hair counts per unit area were first evaluated on photographs without and with CE. Then other scalp hair variables (anagen hair counts and proportion of thin hair (




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Related Web resources:


  • What is hair?
  • Curly Hair
  • Biology of hair growth and development.
  • The phenomenon of hair loss.
  • Methods and treatments for hair loss and baldness.
  • Drugs and hair transplantation surgery for hair loss and baldness.
  • Hair loss linked to other health problems.
  • Baldness by choice and fashion.
  • Alopecia info.
  • Alopecia treatment info.
  • Alopecia treatment info.
  • Hair care info.
  • Hair loss and alopecia research articles: abstracts and source links.



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