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J Invest Dermatol 2003 Jan;120(1):27-35
Fas and c-kit are involved in the control of hair follicle melanocyte apoptosis and migration in chemotherapy-induced hair loss.
Chemotherapy alters the structure and function of hair follicle melanocytes. Molecular mechanisms controlling melanocyte responses during chemotherapy-induced hair loss, however, remain largely unknown. Using immunohistology and multicolor confocal microscopy, we show here that cyclophosphamide administration to C57BL/6 mice alters the activity and fate of hair follicle melanocytes. After 24-48 h, hair bulb melanocytes expressing Fas undergo apoptosis. The number of apoptotic follicular melanocytes is significantly reduced (p<0.01) in cyclophosphamide-treated Fas knockout mice compared to wild-type controls, suggesting that Fas signaling contributes to chemotherapy-induced melanocyte death. After 3-5 d, surviving hair bulb melanocytes express c-kit receptor, proliferate, and appear to migrate up the outer root sheath. Tyrosinase-positive and melanogenically active cells then appear in the epidermis. By Western blotting and immunohistochemistry, expression levels of the c-kit ligand, stem cell factor, in skin and epidermis are strongly increased after cyclophosphamide treatment. Cyclophosphamide-induced migration of the hair follicle melanocytes into epidermis is completely abrogated by administration of c-kit neutralizing antibody. These data suggest that chemotherapy induces a complex response in the hair follicle melanocytes, which includes apoptosis, proliferation, and migration. Pharmacologic manipulation of Fas and c-kit signaling pathways might be useful for the correction of skin hyperpigmentation as a side-effect of chemotherapy.
Contracept Fertil Sex (Paris) 1985 Dec;13(12):1265-8
Hair loss during treatment with oral contraceptives
Oral contraceptives with a dominant androgen component can cause or worsen androgen-dependent alopecia in women. This diagnosis can only be made if other causes of alopecia (which can occur at the same time as treatment with oral contraceptives) have been excluded. The patient's endocrine profile must be investigated sometimes, this being in order to detect any excess production of androgens. These types of alopecia call for the stopping of the oral contraceptive and sometimes also calls for oral anti-antigen treatment.
Eur J Dermatol 2002 May-Jun;12(3):236-9
HLA class II alleles in patients with alopecia areata.
Our purpose was to determine which HLA class II alleles are associated with Turkish alopecia areata patients. Also we investigated whether there was a relationship between the age of onset and severity of disease and HLA alleles or not. Sixty-five patients with alopecia areata were included in this study, and 50 healthy transplant donors were used as a control group. The total group of alopecia areata patients as well as various subgroups according to scalp hair loss were compared to the control group. HLA DNA typing was performed by polymerase chain reaction/sequence specific primer method. The frequency of DQB1*03 allele was 86.1% in all patients compared to 62.0% in controls (P = 0.005). While the frequency of DQB1*03 was significantly increased, the frequency of DRB1*03 was decreased in the all patients group (4.6% versus 22.0%, P = 0.01). In the group of scalp hair loss less than 25%; the frequency of DRB1*03 was decreased (3.2%, P = 0.02). The group of patients with 25-75% scalp hair loss was compared to control group; the frequencies of DRB1*04 (66.7% versus 28.0%, P = 0.02) was increased. When the alopecia totalis, alopecia universalis or alopecia totalis/alopecia universalis group was compared to control group; DQB1*03 was associated with an increased frequency in this group versus control group (90.9%, P = 0.03). There were no significant differences for the other DQ alleles and the DR alleles tested in the patients and in the controls. When patients with early onset were compared to patients with late onset; no significant allele differences were found. Our findings suggested that DQB1*03 allele is a marker for general susceptibility to alopecia areata and may also serve as special genetic marker for susceptibility for the severe form of alopecia areata in our population. However, this association is not related to age at onset of the disease.
Rev Med Liege 2001 Oct;56(10):699-702
Cutaneous side effects of interferons
The alpha, beta and gamma recombinant interferons are indicated in a growing spectrum of therapeutic indications. Some unwanted side effects occur on the skin. The main clinical presentations include vesiculo-bullous sometimes infiltrated dermatitis, vasculitis, necrosis, ulceration and alopecia. Exacerbation of dermatoses such as psoriasis is also possible.
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