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BMC Cell Biol. 2002 Nov 25;3(1):28.
Sequence similarity between stereocilin and otoancorin points to a unified mechanism for mechanotransduction in the mammalian inner ear.
Jovine L, Park J, Wassarman PM.
Brookdale Department of Molecular, Cell and Developmental Biology, Mount Sinai School of Medicine, New York, NY 10029-6574, USA. luca.jovinssm.edu
BACKGROUND: Interaction between hair cells and acellular gels of the mammalian inner ear, the tectorial and otoconial membranes, is crucial for mechanoreception. Recently, otoancorin was suggested to be a mediator of gel attachment to nonsensory cells, but the molecular components of the interface between gels and sensory cells remain to be identified. HYPOTHESIS: We report that the inner ear protein stereocilin is related in sequence to otoancorin and, based on its localisation and predicted GPI-anchoring, may mediate attachment of the tectorial and otoconial membranes to sensory hair bundles. TESTING: It is expected that antibodies directed against stereocilin would specifically label sites of contact between sensory hair cells and tectorial/otoconial membranes of the inner ear. IMPLICATIONS: Our findings support a unified molecular mechanism for mechanotransduction, with stereocilin and otoancorin defining a new protein family responsible for the attachment of acellular gels to both sensory and nonsensory cells of the inner ear.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12445334&dopt=Abstract
Ther Umsch. 2002 May;59(5):211-6.
[Androgenetic alopecia in the man]
[Article in German]
Bader U, Trueb RM.
Dermatologische Klinik, UniversitatsSpital Zurich.
Androgenetic alopecia (AGA) occurs in approximately 40% of men at the age of 40 and 50% at 50, respectively. Especially for young men progressive hair loss can be distressing. Therefore, understanding of these patients' concerns is important for appropriate management. Current understanding of the pathophysiology of AGA mainly focuses on androgen metabolism as it affects hair growth. As a result, pharmacologic treatment has made considerable progress through the introduction of selective 5 alpha-reductase inhibition with finasteride. In placebo-controlled clinical trials in men with AGA, treatment with oral finasteride proved to be effective. Minoxidil is the only pharmacological substance for topical application with proven efficacy. So far, other treatment modalities have no proven efficacy in clinical trials, so that their use cannot be recommended. Options for advanced AGA not amenable to pharmacologic treatment are autologous hair transplantation and hair replacement, both of which have recently also made progress in terms of cosmetic appeal.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12090116&dopt=Abstract
Ther Umsch. 2002 May;59(5):217-22.
[Diffuse hair loss in women]
[Article in German]
Trueb RM.
Dermatologische Klinik, UniversitatsSpital Zurich.
The complaint "Doctor, I am losing my hair" represents a particular challenge to the physician, and involves making a specific diagnosis, selecting an appropriate therapy, and expressing empathy for the patient's anxiety. Diffuse hair loss in women was formerly classified as an entity of its own. Since the identification of female pattern hair loss, most cases have been recognized to be due to androgenetic alopecia, often during phases of life characterized by fluctuations of sexual hormone levels or in connection with intake or cessation of hormonal therapy. The most difficult differential diagnosis includes androgenetic alopecia, chronic telogen effluvium, and psychogenic pseudo efflvuium. Androgenetic alopecia is due to androgen-induced, non-synchronized, progressive shortening of the hair growth cycle and gradually leads to thinning of the central scalp area. Idiopathic chronic telogen effluvium typically occurs in women, starting abruptly without a recognizable initiating factor, and involves the entire scalp area with increased shedding of telogen hair. It is believed to be due to synchronization phenomena of the cyclic hair growth. Psychogenic pseudo effluvium affects fashion-oriented, self-conscious women suffering of a discrepancy between the actual state of their hair and idealized expectations. Later the problem of age-related hair thinning oft becomes a surrogate for the more generalized problem of senescence. Rational therapy of androgenetic alopecia aims at blocking the androgen effect on hair follicles with estrogens and antiandrogens or at pharmacologically reversing vellus hair transformation with topical minoxidil. In contrast, women with idiopathic chronic telogen effluvium should be reassured that their problem is rather a state of exaggerated "hair shedding" than of actual "hair loss".
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12090117&dopt=Abstract
Ther Umsch. 2002 May;59(5):223-7.
[Hair diseases in childhood]
[Article in German]
Hamm H.
Klinik und Poliklinik fur Haut- und Geschlechtskrankheiten, Bayerischen Julius-Maximilians-Universitat Wurzburg. hamm-h.dermail.uni-wuerzburg.de
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.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12090118&dopt=Abstract
The average human scalp is covered by approximatey 100,000 hair follicles. Each hair undergoes
hair cycle and normally 50-100 hairs randomly fall out a day, which is unnoticeable because lost hair is replaced by as many new hairs springing up daily. Hair loss results from the fall out of hair from the hair follicle. Alopecia or excessive, premature hair loss is the condition caused by many factors.
Loss of hair itself does not pose critical health problems because biological role of human hair is relatively marginal. Hair on our scalp protects the head from mechanical shock, heat loss, and exposure to UV-light. The eyelashes and eyebrowes protect the eyes, and hair in the ear canal or the nasal passages help filter out particles and pathogens, thus protecting our internal organs.
However, hair does play important social role: it is one of the major determinants of our appearance and identity in daily life. Fullness of hair also implicates or manifests physical integrity and youthfulness of the person. Losing hair could have more than just emotional impacts on individuals.
The hair is a unique organ that goes through a characteristic cycle consisting of an immature phase, a growing phase called anagen, a transitional phase between the growing phase and the resting phase called catagen, and finally a resting phase called telogen in which the hair stops growing, waiting to fall out. 85-90% of hairs on our body are in anagen phase or growing phase, which lasts anywhere from two to five years. This phase is followed by a short regression phase, or catagen, which lasts 2-3 weeks. Approximately 1% of hair follicles are in catagen. Approximately 10-15% of hair follicles are in the resting phase, the telogen, which lasts about 3-5 months. Hair follicles typically goes through 10-20 asynchronous cycles during the lifetime.
Persistent loss of more than 150 hairs would consist a state of hair loss, or alopecia, albeit it could be temporary.
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