Literature DB >> 24221551

Catecholestrogens inhibit dopamine methylation in the gonadotrops of the African catfish,Clarias gariepinus.

L A Van Asselt1, R J Timmers, H J Goos, J G Lambert, P G Van Oordt.   

Abstract

Isolated gonadotrops of the African catfish,Clarias gariepinus, were incubated with dopamine (DA) and/or catecholestrone and the activity of the enzyme catechol-O-methyltransferase (COMT) was determined by measuring the methylated products. From the apparent Km values for DA and catecholestrone of 0.4-1.3 μM and 17.9-25.2 μM respectively, it was concluded that catecholestrone is a better substrate for the enzyme COMT, compared to DA. Moreover, the methylation of DA is inhibited by comparatively low concentrations of catecholestrone.

Entities:  

Year:  1989        PMID： 24221551     DOI： 10.1007/BF01875023

Source DB:  PubMed          Journal:  Fish Physiol Biochem        ISSN： 0920-1742            Impact factor:   2.794


  19 in total

1.  [ Induction of pituitary gonadotropin discharge in the carp (Cyprinus carpio L.) with the aid of cisclomiphene citrate].

Authors:  B Breton; B Jalabert; A Fostier
Journal:  Gen Comp Endocrinol       Date:  1975-04       Impact factor: 2.822

2.  The catechol estrogen, 2-hydroxyestradiol, inhibits catechol-O-methyltransferase activity in neuroblastoma cells.

Authors:  T Lloyd; J Weisz; X O Breakefield
Journal:  J Neurochem       Date:  1978-07       Impact factor: 5.372

3.  The dopaminergic inhibition of the gonadotropin-releasing hormone-induced gonadotropin release: an in vitro study with fragments and cell suspensions from pituitaries of the African catfish, Clarias gariepinus (Burchell).

Authors:  R de Leeuw; H J Goos; P G van Oordt
Journal:  Gen Comp Endocrinol       Date:  1986-08       Impact factor: 2.822

4.  Glycoprotein gonadotropin in the plasma and its cellular origin in the adenohypophysis of sham-operated and ovariectomized rainbow trout, Salmo gairdneri.

Authors:  L J Van Putten; J Peute; P G Van Oordt; H J Goos; B Breton
Journal:  Cell Tissue Res       Date:  1981       Impact factor: 5.249

5.  Gonadotropin release after implantation of anti-estrogens in the pituitary and hypothalamus of goldfish Carassius auratus.

Authors:  R Billard; R E Peter
Journal:  Gen Comp Endocrinol       Date:  1977-06       Impact factor: 2.822

6.  Measurement of aromatase activity in the brain of the African catfish, Clarias gariepinus--a comparison of two assay methods.

Authors:  R J Timmers; J G Lambert
Journal:  Comp Biochem Physiol B       Date:  1987

7.  Rapid and sensitive single-step radiochemical assay for catechol-O-methyltransferase.

Authors:  G Zürcher; M Da Prada
Journal:  J Neurochem       Date:  1982-01       Impact factor: 5.372

8.  Changes in plasma gonadotropin after ovariectomy and estradiol supplementation at different stages at the end of the reproductive cycle in the rainbow trout (Salmo gairdneri R.).

Authors:  M C Bommelaer; R Billard; B Breton
Journal:  Reprod Nutr Dev       Date:  1981

9.  Pimozide modulates the luteinizing hormone-releasing hormone effect on gonadotrophin release in the African catfish, Clarias lazera.

Authors:  R de Leeuw; J W Resink; E J Rooyakkers; H J Goos
Journal:  Gen Comp Endocrinol       Date:  1985-04       Impact factor: 2.822

10.  [Potentiation by pimozide of the effects of LHRH-A on hypophyseal gonadotropin secretion, ovulation and spermiation in the common carp (Cyprinus carpio)].

Authors:  R Billard; K Alagarswami; R E Peter; B Breton
Journal:  C R Seances Acad Sci III       Date:  1983-01-31
View more
  1 in total

1.  Dopamine regulation of testicular activity in intact and hypophysectomized frogs, Rana esculenta.

Authors:  S Minucci; S Fasano; M D'Antonio; R Pierantoni
Journal:  Experientia       Date:  1993-01-15
  1 in total

北京卡尤迪生物科技股份有限公司 © 2022-2023.