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Occurrence and in vitro biosynthesis of 11-ketotestosterone in Siberian sturgeon, Acipenser baeri Brandt maturing females.

Identifieur interne : 000515 ( Ncbi/Checkpoint ); précédent : 000514; suivant : 000516

Occurrence and in vitro biosynthesis of 11-ketotestosterone in Siberian sturgeon, Acipenser baeri Brandt maturing females.

Auteurs : B. Cuisset [France] ; A. Fostier ; Patrick Williot [France] ; C. Bennetau-Pelissero ; Françoise Le Menn [France]

Source :

Fish physiology and biochemistry [ 0920-1742 ] ; 1995.

RBID : pubmed:24197499

Abstract

High levels of 11-ketotestosterone (11KT) were found (49 to 160 ng ml(-1)) in plasma of Siberian sturgeon females during the end of their reproductive cycle. These levels were measured either by specific radioimmunoassay, or both by specific radioimmunoassay and by UV absorption after HPLC (isocratic conditions, 33% methanol, 26% acetonitrile, 41% water). In order to find the origin of 11KT synthesis, ovaries were incubated (30 min and 2h at 20°C) with tritiated 17-hydroxyprogesterone (17OHP) or with tritiated androstenedione (A4). Testosterone (conversion rate from tritiated 17OHP: 4%) and 11-ketotestosterone (conversion rate from tritiated A4: 1.6%) were identified as metabolites of respectively 17OHP and A4 (TLC, HPLC and crystallization). 11β-hydroxyandrostenedione (11βOHA4) and 11β-hydroxytestosterone (11βOHT) were suggested to be intermediate metabolites. Besides interrenal and blood cells were incubated respectively with tritiated cortisol and tritiated A4. 11βOHA4 was identified in interrenal incubation (yield from tritiated cortisol: 1.2%). 11KT in interrenal (yield from tritiated cortisol: 0.14%), and 11βOHA4 and 11KT in blood cells (yield from tritiated A4: 1.6%), were suspected to be synthesized (TLC, HPLC, acetylation). No significant metabolization of tritiated cortisol could be found in liver. The possible contribution of each of these tissues to high 11KT levels found in plasma is discussed.

DOI: 10.1007/BF00004069
PubMed: 24197499

Affiliations:

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pubmed:24197499

Le document en format XML

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<front><div type="abstract" xml:lang="en">High levels of 11-ketotestosterone (11KT) were found (49 to 160 ng ml(-1)) in plasma of Siberian sturgeon females during the end of their reproductive cycle. These levels were measured either by specific radioimmunoassay, or both by specific radioimmunoassay and by UV absorption after HPLC (isocratic conditions, 33% methanol, 26% acetonitrile, 41% water). In order to find the origin of 11KT synthesis, ovaries were incubated (30 min and 2h at 20°C) with tritiated 17-hydroxyprogesterone (17OHP) or with tritiated androstenedione (A4). Testosterone (conversion rate from tritiated 17OHP: 4%) and 11-ketotestosterone (conversion rate from tritiated A4: 1.6%) were identified as metabolites of respectively 17OHP and A4 (TLC, HPLC and crystallization). 11β-hydroxyandrostenedione (11βOHA4) and 11β-hydroxytestosterone (11βOHT) were suggested to be intermediate metabolites. Besides interrenal and blood cells were incubated respectively with tritiated cortisol and tritiated A4. 11βOHA4 was identified in interrenal incubation (yield from tritiated cortisol: 1.2%). 11KT in interrenal (yield from tritiated cortisol: 0.14%), and 11βOHA4 and 11KT in blood cells (yield from tritiated A4: 1.6%), were suspected to be synthesized (TLC, HPLC, acetylation). No significant metabolization of tritiated cortisol could be found in liver. The possible contribution of each of these tissues to high 11KT levels found in plasma is discussed.</div>
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Occurrence and in vitro biosynthesis of 11-ketotestosterone in Siberian sturgeon, Acipenser baeri Brandt maturing females.

Occurrence and in vitro biosynthesis of 11-ketotestosterone in Siberian sturgeon, Acipenser baeri Brandt maturing females.

Source :

Abstract

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