Loose anagen syndrome as a severity factor for trichotillomania.

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Br J Dermatol 2002 Oct;147(4):789-92

Loose anagen syndrome as a severity factor for trichotillomania.

Loose anagen syndrome (LAS) is a condition of childhood where anagen hairs are easily and painlessly extracted. The condition is due to poor adhesion between the cuticle of the hair shaft and the inner root sheath. A 4-year-old girl presented with patches of hair loss and a clinical diagnosis of trichotillomania was made. A hair pull test extracted multiple hairs easily and painlessly. Light microscopic examination was consistent with LAS. A biopsy was performed, which showed features of trichotillomania. However, on request the child did not display sufficient dexterity to pull out her own hair. It was subsequently determined that her hair loss was likely to be due to a third person plucking out her hair. It appears that in this case the LAS was not the cause of her hair loss, but rather acted as a severity factor for trichotillomania by proxy in that the lack of pain on plucking the hairs removed the principle deterrent.

Br J Dermatol 2002 Jun;146(6):992-9

Effects of minoxidil 2% vs. cyproterone acetate treatment on female androgenetic alopecia: a controlled, 12-month randomized trial.

BACKGROUND: Hormone studies have demonstrated the androgen-dependent character of female androgenetic alopecia, but there have been few controlled studies of therapies for alopecia in women. OBJECTIVES: To compare topical minoxidil 2% and cyproterone acetate in the treatment of female alopecia. METHODS: Sixty-six women with female-pattern alopecia were randomly assigned for 12 cycles into two groups, 33 received two local applications (2 mL day-1) of topical minoxidil 2% plus combined oral contraceptive and 33 received cyproterone acetate 52 mg day-1 plus ethinyl oestradiol 35 microg for 20 of every 28 days. RESULTS: A mean reduction of 2.4 +/- 6.2 per 0.36 cm2 in hairs of diameter > 40 microm was observed in the cyproterone acetate group (P = 0.05) and a mean increase of 6.5 +/- 9 per 0.36 cm2 in the minoxidil group (P < 0.001). Comparison of the total number of hairs at 12 months and the body mass index (BMI) revealed a borderline positive correlation in the cyproterone acetate group (r = 0.39, P = 0.06) and a negative correlation in the minoxidil group (r = -0.42, P < 0.05). No significant difference was observed in the total number of hairs among cyproterone acetate patients according to the presence or absence of other symptoms of hyperandrogenism, whereas in the minoxidil group, the total number of new hairs was higher in patients with isolated alopecia (Delta = 8.1; P < 0.05). Variations in scalp seborrhoea were significant in both groups, but the result was better (for acne and hirsutism as well) in the cyproterone acetate group than in the minoxidil group (P < 0.001). CONCLUSIONS: Minoxidil treatment was more effective in the absence of other signs of hyperandrogenism, hyperseborrhoea, and menstrual cycle modifications when the BMI was low, and when nothing argued in favour of biochemical hyperandrogenism. Cyproterone acetate treatment was more effective when other signs were present and when the BMI was elevated, factors that favoured a diagnosis of biochemical hyperandrogenism.

J Altern Complement Med 2002 Apr;8(2):143-52

A randomized, double-blind, placebo-controlled trial to determine the effectiveness of botanically derived inhibitors of 5-alpha-reductase in the treatment of androgenetic alopecia.

BACKGROUND: Androgenetic alopecia (AGA) is characterized by the structural miniaturization of androgen-sensitive hair follicles in susceptible individuals and is anatomically defined within a given pattern of the scalp. Biochemically, one contributing factor of this disorder is the conversion of testosterone (T) to dihydrotestosterone (DHT) via the enzyme 5-alpha reductase (5AR). This metabolism is also key to the onset and progression of benign prostatic hyperplasia (BPH). Furthermore, AGA has also been shown to be responsive to drugs and agents used to treat BPH. Of note, certain botanical compounds have previously demonstrated efficacy against BPH. Here, we report the first example of a placebo-controlled, double-blind study undertaken in order to examine the benefit of these botanical substances in the treatment of AGA. OBJECTIVES: The goal of this study was to test botanically derived 5AR inhibitors, specifically the liposterolic extract of Serenoa repens (LSESr) and beta-sitosterol, in the treatment of AGA. Subjects: Included in this study were males between the ages of 23 and 64 years of age, in good health, with mild to moderate AGA. RESULTS: The results of this pilot study showed a highly positive response to treatment. The blinded investigative staff assessment report showed that 60% of (6/10) study subjects dosed with the active study formulation were rated as improved at the final visit. CONCLUSIONS: This study establishes the effectiveness of naturally occurring 5AR inhibitors against AGA for the first time, and justifies the expansion to larger trials.

J Theor Biol 2002 Feb 7;214(3):469-79

The follicular automaton model: effect of stochasticity and of synchronization of hair cycles.

Human scalp hair consists of a set of about 10(5)follicles which progress independently through developmental cycles. Each hair follicle successively goes through the anagen (A), catagen (C), telogen (T) and latency (L) phases that correspond, respectively, to growth, arrest and hair shedding before a new anagen phase is initiated. Long-term experimental observations in a group of ten male, alopecic and non-alopecic volunteers allowed determination of the characteristics of hair follicle cycles. On the basis of these observations, we previously proposed a follicular automaton model to simulate the dynamics of human hair cycles and the development of different patterns of alopecia [Halloy et al. (2000) Proc. Natl Acad. Sci. U.S.A.97, 8328-8333]. The automaton model is defined by a set of rules that govern the stochastic transitions of each follicle between the successive states A, T, L and the subsequent return to A. These transitions occur independently for each follicle, after time intervals given stochastically by a distribution characterized by a mean and a standard deviation. The follicular automaton model was shown to account both for the dynamical transitions observed in a single follicle, and for the behaviour of an ensemble of independently cycling follicles. Here, we extend these results and investigate additional properties of the model. We present a deterministic version of the follicular automaton. We show that numerical simulations of the stochastic version of the automaton yield steady-state level of follicles in the different phases which approach the levels predicted by the deterministic equations as the number of follicles progressively increases. Only the stochastic version can successfully reproduce the fluctuations of the fractions of follicles in each of the three phases, observed in small follicle populations. When the standard deviation is reduced or when the follicles become otherwise synchronized, e.g. by a periodic external signal inducing the transition of anagen follicles into telogen phase, large-amplitude oscillations occur in the fractions of follicles in the three phases. These oscillations are not observed in humans but are reminiscent of the phenomenon of moulting observed in a number of mammalian species.

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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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