Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:Q7LGC8 (HSD)
 3,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Sebaceous glands were isolated by manual dissection using a stereomicroscope from skin specimens of bald scalp of men with male-pattern baldness undergoing hair transplant or scalp reduction surgery and also from specimens taken from hairy and bald areas of scalp at autopsy of adult male victims of accidental death within 3 h post mortem. Homogenates of the isolated glands exhibited activities of delta 5-3 beta-hydroxysteroid dehydrogenase (3 beta HSD), 17 beta-hydroxysteroid dehydrogenase, and testosterone 5 alpha-reductase by the conversion of [3H]dehydroepiandrosterone (DHA) to 3H-delta 4-androstenedione (AD), [3H]testosterone, and [3H]dihydrotestosterone. Homogenates of glands from bald (B) scalp had greater 3 beta HSD activity than homogenates of glands from hairy (H) scalp. After differential centrifugation, 3 beta HSD activity was found mainly in the microsomal and 105,000 X g supernatant fractions. Specific activity of the enzyme based on protein mass was highest in the microsomal fraction; however, the total 3 beta HSD activity in the 105,000 X g supernatent of B glands was significantly (p less than .01) greater than that of H glands. 3 beta HSD activity in sebaceous glands isolated from autopsy specimens did not differ from that of glands isolated from surgical specimens in apparent Km (0.13-0.14 microM), pH optima (8.0), or coenzyme requirement for NAD. Since substantial 3 beta HSD activity was present in the cytosol, and cytosol of B glands showed increased 3 beta HSD activity, the increased conversion of DHA to AD may be a critical step for androgenic action and may be responsible for excessive androgenicity in male-pattern baldness.
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PMID:delta 5-3 beta-hydroxysteroid dehydrogenase activity in sebaceous glands of scalp in male-pattern baldness. 247 35

The in vitro metabolisms of [4-14C]-labelled DHA, delta 5-diol, delta 4-dione and Test were studied in skin tissue excised from the hairy hypogastric region of three patients diagnosed as suffering from "idiopathic hirsutism". The concentrations of DHA, And, delta 4-dione, delta 5-diol, Test, DHT, DHA-S, And-S, delta 5-diol-S and Test-S were determined in other portions of the same skin tissue. In the knowledge of the concentrations of the androgens and the C19-steroid sulphates in the blood and in the skin tissue, and also of the metabolisms of the main androgen precursors and Test in the hairy abdominal skin, new diagnoses can be established within the group of idiopathic hirsutisms : "pure peripheral hirsutism" and "mixed peripheral hirsutism". In the former the hyperactivity of the enzymes of the skin tissue takes part in the emergence of the disease form, while the latter involves the joint participation of the hyperactivity of the enzymes of the skin tissue and the high level of delta 4-dione in the blood. The picture of the metabolism in the hairy abdominal skin of the hirsute patients was dominated by Test formed in pathologically high amount from the precursors as a consequence of the hyperactivity of 17 beta-HSD. The formation of DHT and the activity of 5 alpha-R were of only secondary importance.
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PMID:Metabolism and concentration of androgenic steroids in the abdominal skin of women with idiopathic hirsutism. 623 9