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J. Anat 2003 Jan;202(1):125-31
Mouse models for human hair loss disorders.
The outer surface of the hand, limb and body is covered by the epidermis, which is elaborated into a number of specialized appendages, evolved not only to protect and reinforce the skin but also for social signalling. The most prominent of these appendages is the hair follicle. Hair follicles are remarkable because of their prolific growth characteristics and their complexity of differentiation. After initial embryonic morphogenesis, the hair follicle undergoes repeated cycles of regression and regeneration throughout the lifetime of the organism. Studies of mouse mutants with hair loss phenotypes have suggested that the mechanisms controlling the hair cycle probably involve many of the major signalling molecules used elsewhere in development, although the complete pathway of hair follicle growth control is not yet understood. Mouse studies have also led to the discovery of genes underlying several human disorders. Future studies of mouse hair-loss mutants are likely to benefit the understanding of human hair loss as well as increasing our knowledge of mechanisms controlling morphogenesis and tumorigenesis.
Transgenic Res 2002 Jun;11(3):241-7
Inducible, reversible hair loss in transgenic mice.
Telogen effluvium is a common type of hair loss. Although the morphological changes associated with telogen effluvium have been well characterized, the underlying molecular mechanisms remain unknown, and no animal models have been developed. We report here that inducible transgenic mice expressing high levels of the transcription factor, tTA (tetracycline transactivator), plus a reporter luciferase gene, show a reversible hair loss phenotype. Skin of these mice exhibits an increase in the number of hair follicles at the telogen phase, but a decreased number of follicles at the anagen phase. These changes resemble skin pathology seen in patients with telogen effluvium, which suggests that the inducible transgenic mice may be useful as a model for this disorder. Moreover, since overexpression of several other transgenes failed to cause skin pathology, the present findings also indicate types of molecular abnormalities that may cause reversible hair loss.
Rev Environ Health 2001 Jul-Sep;16(4):233-51
Adverse health effects of selenium in humans.
Epidemiologic studies and case reports have shown that chronic exposure to selenium compounds is associated with several adverse health effects in humans. An early toxic effect of selenium is on endocrine function, particularly on the synthesis of thyroid hormones following dietary exposure of around 300 micrograms Se/d, and on the metabolism of growth hormone and insulin-like growth factor-1. Other adverse effects of selenium exposure can be the impairment of natural killer cells activity and at higher levels, hepatotoxicity and gastrointestinal disturbances. Dermatologic effects, such as nail and hair loss and dermatitis, occur after exposure to high levels of environmental selenium. Assessing the toxicity and morbidity after long-term exposure to environmental selenium is difficult: neurotoxicity, particularly the degeneration of motor neurons leading to increased risk of amyotrophic lateral sclerosis, might occur after chronic exposure to both organic and inorganic selenium compounds. The results of laboratory investigations and cohort studies suggest that selenium species exhibit a bivalent effect in cancer, either increasing or decreasing risk. Current environmental selenium exposure limits appear to be inadequate for averting adverse health effects.
Cancer Pract 2001 Nov-Dec;9(6):283-9
Psychological sequelae and alopecia among women with cancer.
PURPOSE: This article reviews the relevant literature on treatment-induced alopecia in women with cancer and describes the development of a computer-assisted intervention to reduce distress associated with this side effect. DESCRIPTION OF PROGRAM: Alopecia has been cited as the most disturbing anticipated side effect by up to 58% of women preparing for chemotherapy, with 8% being at risk for avoiding treatment. Women with cancer who experience alopecia as a side effect, compared with women with cancer and no alopecia, report lower self-esteem, poorer body image, and lower quality of life. Although physicians' recommendations are the most influential factor on cancer treatment choice, body image and effects on sexuality are the next most influential factors. A study of a computer-imaging intervention, based on concepts related to guided imagery and anticipatory grief, has been launched in an effort to aid women in coping with anticipated treatment-related alopecia. RESULTS: While we are still waiting for final data collection and analysis from the computer intervention study, the feedback thus far has been positive. CLINICAL IMPLICATIONS: The intervention described here may prove to be effective in desensitizing women with cancer to hair loss and facilitating an adjustment to self-acceptance. As such, a higher quality of life during the difficult time of coping may be maintained. The development of a computer-imaging intervention offers an opportunity to integrate a standard psychosocial intervention, personalized for each patient, into the routine patient care in the oncology setting.
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