title: Cytochrome b5 expression in gonadectomy-induced adrenocortical neoplasms of the domestic ferret (Mustela putorius furo).
abstract: Whereas the adrenal glands of healthy ferrets produce only limited amounts of androgenic steroids, adrenocortical neoplasms that arise in neutered ferrets typically secrete androgens or their derivative, estrogen. The 17,20-lyase activity of cytochrome P450 17alpha-hydroxylase/17,20-lyase (P450c17) must increase to permit androgen biosynthesis in neoplastic adrenal tissue. We screened ferret adrenocortical tumor specimens for expression of cytochrome b(5) (cyt b(5)), an allosteric regulator that selectively enhances the 17,20-lyase activity of P450c17. Cyt b(5) immunoreactivity was evident in 24 of 25 (96%) adrenocortical adenomas/carcinomas from ferrets with signs of ectopic sex steroid production. Normal adrenocortical cells lacked cyt b(5), which may account for the low production of adrenal androgens in healthy ferrets. Other markers characteristic of gonadal somatic cells, such as luteinizing hormone receptor, aromatase, and GATA4, were coexpressed with cyt b(5) in some of the tumors. We concluded that cyt b(5) is upregulated during gonadectomy-induced adrenocortical neoplasia and is a marker of androgen synthetic potential in these tumors.
authors.affiliation: Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid Ave., St. Louis, MO 63110, USA.
authors.forename: S
authors.initials: S
authors.lastname: Wagner
authors.forename: M
authors.initials: M
authors.lastname: Kiupel
authors.forename: R A
authors.initials: RA
authors.lastname: Peterson
authors.forename: M
authors.initials: M
authors.lastname: Heikinheimo
authors.forename: D B
authors.initials: DB
authors.lastname: Wilson
mesh_terms: D000306:Adrenal Cortex Neoplasms / Q000201:enzymology / Q000378:metabolism / Q000662:veterinary*; D018246:Adrenocortical Adenoma / Q000201:enzymology / Q000378:metabolism / Q000662:veterinary*; D018268:Adrenocortical Carcinoma / Q000201:enzymology / Q000378:metabolism / Q000662:veterinary*; D000818:Animals; D015786:Cytochromes b5 / Q000096:biosynthesis* / Q000378:metabolism; D005260:Female; D005289:Ferrets; D050991:GATA4 Transcription Factor / Q000378:metabolism; D007150:Immunohistochemistry / Q000662:veterinary; D007265:Inhibins / Q000378:metabolism; D008297:Male; D011974:Receptors, LH / Q000378:metabolism; D012189:Retrospective Studies; D015854:Up-Regulation
chemical_list: D050991:GATA4 Transcription Factor; D011974:Receptors, LH; C094377:inhibin-alpha subunit; D007265:Inhibins; D015786:Cytochromes b5