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Clin Exp Dermatol 2002 Jul;27(5):410-7
Alopecia areata - animal models.
Several rodent models with spontaneous and induced alopecia areata (AA), a nonscarring inflammatory hair loss disease with suspected autoimmune elements, have been identified. Of these, the C3H/HeJ mouse and DEBR rat have been most extensively used in examining AA development. Flow cytometry and micro array characterization, manipulation of inflammatory cells by in vivo cell depletion or cell receptor blockade, lymph node cell transfer between affected and unaffected rodents, and the recent use of transgenic knockout mice have given important insights into the development of AA. From our current understanding of rodent models, the development of AA relies upon a general genetic susceptibility where major susceptibility genes may be supplemented by minor disease severity modifying genes. However, the actual onset of AA, its duration, extent, and persistence in individual rodents may be modified by epigenetic factors. Rodent AA seems to be fundamentally, but not exclusively, Th1 cell mediated. Onset of disease may be dependent on several factors including the break down of the putative anagen stage hair follicle immune privilege, appropriate antigen presentation with costimulation of lymphocytes, presence of autoreactive lymphocytes, and a deficiency of functional immune system regulatory cells. Rodents have already been used in examining a variety of current AA treatments and developing new therapies with some success. With a greater understanding of AA disease mechanisms through rodent model research, improved and more specific treatment interventions may be defined.
Clin Exp Dermatol 2002 Jul;27(5):383-88
Female pattern hair loss.
Female pattern hair loss is a common condition characterized by a diffuse reduction in hair density over the crown and frontal scalp with retention of the frontal hairline. The prevalence increases with advancing age. It has been widely thought to be the female counterpart of male balding and is often referred to as female androgenetic alopecia. However, the role of androgens is not fully established. Scalp hair loss is undoubtedly a feature of hyperandrogenism in women but many women with female pattern hair loss have no other clinical or biochemical evidence of androgen excess. Female pattern hair loss is probably a multifactorial genetically determined trait and it is possible that both androgen-dependent and androgen-independent mechanisms contribute to the phenotype. In managing patients with female pattern hair loss the physician should be aware that the adverse effects on quality of life can be quite severe and do not necessarily correlate with the objective degree of hair loss. The treatment options are currently limited but modest improvements in hair density are achievable in some women.
Med Hypotheses 2002 Apr;58(4):261-3
Hormone-induced aberrations in electromagnetic adhesion signaling as a developmental factor of androgenetic alopecia.
In androgenetic alopecia, overactivation of the androgen hormone cascade in genetically predisposed persons leads to miniaturization of the dermal papilla of the hair follicle and to reduction in the number of papilla cells in the scalp, but the mechanisms explaining this miniaturization have remained unclear. According to our hypothesis, the increase of dihydrotestosterone (DHT) production in the overactive androgen state inhibits cell mitosis in the dermal papilla and contributes to the induction of programmed cell death (apoptosis). Normally, DNA molecules have a negative charge, which doubles in every cell mitosis. In the catagen and telogen phases, the sulphur-rich hair moves upwards, dehydrates and develops an increasing positive charge. In a normal hair-growth cycle, the epithelial column shortens and the secondary germ is formed and it invaginates the dermal papilla by electromagnetic attraction. In the mitotic inhibition state induced by DHT, the negative charge decreases, leading to a weakening of the electromagnetic adhesion forces and weaker electrical attraction between the undifferentiated germ cells and the dermal papilla. Insulin resistance has an additional pathogenic role in the excessive miniaturization of the hair follicle. The vasoactive substances associated with endothelial dysfunction in insulin resistance induce microcirculatory disturbance, perifollicular vasoconstriction and stimulation of smooth muscle cell proliferation in the vascular wall. This leads to microvascular insufficiency and local tissue hypoxia and progressive miniaturization of hair follicles.
Lasers Surg Med 2002;30(2):127-34
Hair removal with the long pulsed Nd:YAG laser: a prospective study with one year follow-up.
BACKGROUND AND OBJECTIVE: The aim was to investigate the efficacy, side effects, and the long-term results of a long pulsed Nd:YAG-Laser for hair removal in different hair colors and skin types. STUDY DESIGN/MATERIALS AND METHODS: We performed a prospective clinical study with 29 volunteers. Treatment was performed on the lower leg with a long pulsed Nd:YAG-Laser. Five test areas were treated 1-5 times in monthly intervals; one served as control. Follow-up investigations were performed at each session, and 3, 6, and 12 months after the last therapy. No depilatory treatment except shaving was allowed during the time of follow-up. Percentual hair loss, short- and long-term side effects, and pain during the treatment were evaluated. RESULTS: After one month, a hair loss of greater than 50% was found in 44.9% of the areas treated once. With up to five treatments, this percentage increased up to 71.5%. One year after therapy, a greater than 50% hair reduction was still present in 40% of the five-treatment-areas and in 0% of the areas treated only once. There were no permanent side effects despite one small scar after a folliculitis. CONCLUSIONS: The long pulsed Nd:YAG is suitable to remove hair for more than 12 months effectively, although 4-5 sessions are necessary for these results. Blond hair can also be removed, although much less effective. No lasting side effects could be seen. Darker skin types or tanned skin can also be treated without side effects. A cooling may be advisable due to the pain reported by the volunteers.
Made of well known Chinese traditional herbs, Hair Million is a herbal hair restoration formula that addresses hair loss problems.
Since the herbs have been in use for thousands of years, there have been numerous anecdotal cases so far that Hair Million herbs can really improves the age-related hair thinning and hair loss for a significant fraction of people who take it diligently.
It is unknown how Hair Million stops hair loss, and promotes hair growth, despite all the anecdotal observations.
Neither scientific research nor placebo controlled clinical trials has been conducted due to the cost.
Shortage or total lack of scientific/clinical research is not uncommon in herbal/nutritional arena.
It is not reasonable to stop taking daily food and herbal supplements altogether just because of scietific/clinical support: our life must go on while we stive to better understand food and herb.
There are two merits that Hair Million enjoys: Firstly, Hair Million is relatively inexpensive, and secondly, it is made only of edible herbs that are known to be safe when consumed in regular quantities. Propecia is a clinically tested prescription drug for hair loss treatment.
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