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  • Title: [Hypothyroidism and hyperprolactinemia as a possible cause of androgenetic alopecia in the female].
    Author: Schmidt JB, Schurz B, Huber J, Spona J.
    Journal: Z Hautkr; 1989 Jan 15; 64(1):9-12. PubMed ID: 2494810.
    Abstract:
    31 female patients suffering from androgentic alopecia were examined by means of the TRH test with regard to hypothyroidism and hyperprolactinemia. Before, as well as 20 and 40 minutes after, application of thyroxine releasing hormone (TRH), the serum concentrations of the hypohyseal thyroxine stimulating hormone (TSH) and prolactin (PRL) were measured by radioimmunoassay (RIA). In 7 of the patients (23%), we found increased TSH levels after stimulation with TRH--indicative of hypothyroidism. In 9 of the patients (29%), we observed increased PRL levels after TRH stimulation, indicating prolactinemia. TSH and PRL can interact with androgen metabolism at various levels. Thyroxine may influence the unbound, metabolically active testosterone via the sex hormone binding globulin (SHBG). Prolactine, which is stimulated by TRH, promotes the suprarenal cortisol and androgen production. In 48% of the patients, we found either hypothyroidism or hyperprolactinemia. This suggests that both conditions may contribute to the clinical picture of female androgenetic alopecia, as they interfere with the androgen metabolism.
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