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Departamentos de Química Biológica (G.P.V.,
C.P.L., M.D.G) and
Química Orgánica (M.C.M., A.S.V.,
G.B.),
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos
Aires and PRHOM-Consejo Nacional de Investigaciones Científicas
y Técnicas (G.P.V., C.P.L., M.D.G.), Ciudad
Universitaria, (1428) Buenos Aires, Argentina
In the rat, the conformationally highly bent steroid
21-hydroxy-6,19-oxidoprogesterone efficiently displaces
[3H]corticosterone from thymus-glucocorticoid receptors
and blocks type II receptors in kidney cytosols but competes with
neither [3H]aldosterone for kidney-mineralocorticoid
receptors nor [3H]progesterone for uterus-progesterone
receptors. It evokes Na+ retention only at very high doses
(~100 µg/100 g of rat weight) and is unable to induce tyrosine
aminotransferase or to increase glycogen deposits in rat liver. When
coincubated with corticosterone or dexamethasone, 2.5 µM
21OH-6OP inhibits 80% of tyrosine aminotransferase induction. It may
therefore be used experimentally as an antiglucocorticoid virtually
lacking mineralocorticoid or glucocorticoid properties as well as
affinity for mineralocorticoid or progesterone receptors.
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