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Mol Cell Endocrinol 2002 Dec 30;198(1-2):89-95
Androgens and alopecia.
Androgens have profound effects on scalp and body hair in humans. Scalp hair grows constitutively in the absence of androgens, while body hair growth is dependent on the action of androgens. Androgenetic alopecia, referred to as male pattern hair loss (MPHL) in men and female pattern hair loss (FPHL) in women, is due to the progressive miniaturization of scalp hair. Observations in both eunuchs, who have low levels of testicular androgens, and males with genetic 5alpha-reductase (5alphaR) deficiency, who have low levels of dihydrotestosterone (DHT), implicate DHT as a key androgen in the pathogenesis of MPHL in men. The development of finasteride, a type 2-selective 5alphaR inhibitor, further advanced our understanding of the role of DHT in the pathophysiology of scalp alopecia. Controlled clinical trials with finasteride demonstrated improvements in scalp hair growth in treated men associated with reductions in scalp DHT content, and a trend towards reversal of scalp hair miniaturization was evident by histopathologic evaluation of scalp biopsies. In contrast to its beneficial effects in men, finasteride did not improve hair growth in postmenopausal women with FPHL. Histopathological evaluation of scalp biopsies confirmed that finasteride treatment produced no benefit on scalp hair in these women. These findings suggest that MPHL and FPHL are distinct clinical entities, with disparate pathophysiologies. Studies that elucidate the molecular mechanisms by which androgens regulate hair growth would provide greater understanding of these differences.
Ther Umsch 2002 May;59(5):223-7
Hair diseases in childhood
This paper focuses on four important hair diseases mainly occurring in children. Trichotillomania is the most relevant differential diagnosis of alopecia areata in childhood. Meticulous inspection and lack of telogen hairs in the trichogram from the margin of the lesion usually are sufficient for differentiation. The trichogram also plays a significant role for the diagnosis of the loose anagen hair (loose anagen syndrome), a fairly new, but not rare entity, especially in distinguishing it from telogen effluvium. Five different types of clinical presentation are distinguished in tinea capitis. For the necessary systemic therapy; the new antimycotics terbinafine and itraconazole represent good alternatives to the well-tried griseofulvin. Several effective therapeutic options are also available for head lice, the most frequent parasitary infestation of school age. However, because of its neurotoxicity and the increasing problem of lice resistance lindane should not be used any longer for the treatment of head lice.
J Am Acad Dermatol 2002 Apr;46(4):541-4
Sulfasalazine for alopecia areata.
Sulfasalazine is used as a therapy for various autoimmune conditions, including psoriasis; its effectiveness is presumed to be the result of its immunomodulatory effects. We have treated patients with severe alopecia areata with sulfasalazine as part of our dermatology practice and have noticed cosmetically acceptable regrowth in 23% of patients in whom a response could be determined. In view of its good safety profile, sulfasalazine may be considered for systemic treatment of severe alopecia areata.
Vet Dermatol. 2003 Apr;14(2):91-7.
Retrospective evaluation of sex hormones and steroid hormone intermediates in dogs with alopecia.
The purpose of this study was to determine if there are specific steroid hormone aberrations associated with suspect endocrine alopecias in dogs in whom hypothyroidism and hyperadrenocorticism have been excluded. Steroid hormone panels submitted to the UTCVM endocrinology laboratory over a 7.5-year period (783 samples) from dogs with alopecia were reviewed. During this period, 276 dogs met the criteria for inclusion and were comprised of 54 different breeds. Approximately 73% of dogs had at least one baseline or post-ACTH stimulation steroid hormone intermediate greater than the normal range. The most frequent hormone elevation noted was for progesterone (57.6% of samples). When compared with normal dogs, oestradiol was significantly greater in Keeshond dogs and progesterone was significantly greater in Pomeranian and Siberian Husky dogs. Not all individual dogs had hormone abnormalities. Chow Chow, Samoyed and Malamute dogs had the greatest percentage of normal steroid hormone intermediates of the dogs in this study. Baseline cortisol concentrations were significantly correlated with progesterone, 17-hydroxyprogesterone (17-OHP) and androstenedione. Results of this study suggest that the pathomechanism of the alopecia, at least for some breeds, may not relate to steroid hormone intermediates and emphasizes the need for breed specific normals.
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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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