Identification and characterization of estrogen and progesterone receptors from the oviduct of the American alligator (Alligator mississippiensis).

Abstract:

:A protein extract prepared from the egg shell fiber-secreting region of the oviduct of Alligator mississippiensis was assayed for the presence of receptors for estrogen and progesterone. In the presence of [3H]-estradiol-17 beta, the extract contained an estrogen-binding activity which reached equilibrium at 25 degrees C in 1 h. Scatchard analysis demonstrated that a single estrogen-binding activity was present in the extract with a Kd of 0.5 nM for [3H]estradiol-17 beta. A steroid specificity competition assay showed the estrogen binding activity strongly recognized estradiol-17 beta and diethylstilbestrol (DES) and weakly interacted with estrone, estriol, estradiol-17 alpha, and dihydrotestosterone (DHT). The estrogen binding activity did not recognize testosterone, dexamethasone or progesterone. The extract exhibited a DNA-binding activity that recognized an estrogen response element in a gel mobility shift assay. We have also identified a high affinity binding activity in the extract that specifically recognized the synthetic progestin R5020 with a Kd of 0.9 nM. This binding activity recognized 17 alpha-estradiol, dexamethasone, testosterone, and estriol. This activity did not recognize DHT, DES, or estradiol-17 beta. These data suggest the presence of estrogen and progesterone receptors in the oviduct of the alligator.

authors

Vonier PM,Guillette LJ Jr,McLachlan JA,Arnold SF

doi

10.1006/bbrc.1997.6274

subject

Has Abstract

pub_date

1997-03-17 00:00:00

pages

308-12

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(97)96274-4

journal_volume

232

pub_type

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