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Hair Loss Study Abstract: Endocrine properties of the testosterone 5 alpha-reductase inhibitor turosteride (FCE 26073).
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Title
Endocrine properties of the testosterone 5 alpha-reductase inhibitor turosteride (FCE
26073).
Author
Di Salle E; Briatico G; Giudici D; Ornati G; Panzeri A
Address
Laboratory of Endocrinology, R&D, Nerviano (MI), Italy.
Source
J Steroid Biochem Mol Biol, 1994 Feb, 48:2-3, 241-8
Abstract
Turosteride was tested in a series of studies for its effect on 5 alpha-reductase and
for its possible influence on other steroidogenic enzymes and on steroid receptors. The
compound was found to inhibit human and rat prostatic 5 alpha-reductases with IC50 values
of 55 and 53 nM, respectively, whereas it caused a less marked inhibition of the dog
enzyme (IC50 2.2 microM). Turosteride showed no relevant effect on rat adrenal
C20,22-desmolase (IC50 254 microM) and human placental aromatase (IC50 > 100 microM),
and only at relatively high concentrations it caused inhibition of human placental 5-ene-3
beta-hydroxysteroid dehydrogenase-isomerase (3 beta-HSD-I) (IC50 2.5 microM). Turosteride
was found to be a selective 5 alpha-reductase inhibitor showing no noteworthy binding to
receptors for androgens (relative binding affinity, RBA, 0.004%), estrogens ( 005%), progesterone (005%),
glucocorticoids (5 alpha-androstan-3-one) was confirmed
to be a non-selective 5 alpha-reductase inhibitor, showing a degree of binding affinity to
the androgen receptor (RBA 0.1%) and a marked inhibition of 3 beta-HSD-I (IC50 32 nM).
When given orally in immature castrated rats together with subcutaneous testosterone
propionate (TP) for 7 consecutive days, turosteride reduced the ventral prostate and
seminal vesicle growth promoting effect of TP, with IC50 values of approximately 5 and 6.7
mg/kg/day, whereas levator ani weight was unchanged. In comparison, 4-MA was approx.
3-fold less potent than turosteride in reducing the prostate and seminal vesicle weights
and caused a marked reduction of levator ani weight, thus showing its unselectivity.
Language of Publication
LA=ENG
Unique Identifier
94190818
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