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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.


Br J Dermatol 2002 Apr;146(4):601-8

The hairless gene in androgenetic alopecia: results of a systematic mutation screening and a family-based association approach.


BACKGROUND: Genetic disposition and androgen dependence are important characteristics of the common patterned loss of scalp hair known as androgenetic alopecia (AGA). The genetic factors contributing to AGA are currently unknown. The human hairless gene (HR) has recently been cloned and mutations have been reported in families with autosomal recessive universal congenital alopecia and papular atrichia. The main feature of these disorders is persistent complete absence of hair at or shortly after birth. This suggests that HR is essential and specific for the development of hair. OBJECTIVES: To test the hypothesis that HR may be involved in AGA. METHODS: We systematically screened HR for genetic variability by means of single-strand conformation analysis (SSCA) in 46 unrelated men with AGA. To test for an involvement of HR in the development of AGA, seven common variants were genotyped in 61 families with 93 affected offspring. The results were analysed with the transmission/disequilibrium test (TDT). RESULTS: SSCA showed 15 single nucleotide substitutions: eight missense mutations, four silent mutations and three mutations in exon-flanking intronic sequences. TDT results showed a marginally significant association between AGA and variants 3379-29G/T (P = 0.024) and 2611-68C/T (P = 0.047). These results, however, did not remain significant after applying the conservative Bonferroni correction for multiple testing. CONCLUSIONS: Our results do not provide evidence for a strong involvement of HR in the development of AGA, although a minor role cannot be fully excluded.


Dermatology 2002;204(1):33-6

Perception of baldness and hair density.


BACKGROUND: Androgenetic alopecia needs to be scored precisely. OBJECTIVE: A possible measure is the ratio between the hair density in the parietal area and that in the occipital area which, being not affected by baldness, supposedly has a 'normal' density. METHODS: On the vertex and just below the occipital protuberance of 109 men, two 1-cm(2) areas were identified. In both areas, hairs were clipped short and photographed by a videomicroscope. Hairs were then counted within a 30-mm(2)-wide central square section. RESULTS: In the occipital area, the average count was 127/cm(2), without differences among the Hamilton/Norwood classes. In the parietal area, the average density significantly diminished from 138 to 47/cm(2). A main difference was found between classes 1-3 vertex and classes 4-6. CONCLUSIONS: The parietal/occipital ratio decreased significantly only when baldness was clinically manifest. The parietal/occipital ratio cannot be a better measure of baldness severity than the rough Hamilton/Norwood scale. The perception of early baldness does not depend on the diminished hair density, but also on the progressive thinning of the hair shafts.


Br J Nurs. 2003 May 8-21;12(9):550-8.

Case study of alopecia universalis and web-based news groups.


This article presents findings from an 18-month case study of a web-based news group used by individuals with alopecia universalis. Content analysis of 228 episodes of web-based communication that occurred in relation to themes of discussion was undertaken, supported by the use of concept mapping (Northcott, 1996). Analysis identified a core concept relating to that of a community of shared experience together with four supportive themes. The themes were the search for understanding and meaning, carrying on, seeking balance between past, present and future, and relating to new self, others, and the world. The article discusses the increased growth in the use of the web as a vehicle for exploring health concerns and the specific ethical and methodological issues raised by research in this area.


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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.



    DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells.





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