A proposed sequence of hormones controlling the induction of luteal 20alpha-hydroxy steroid dehydrogenase and progesterone withdrawal in the late-pregnant rat
1. The previously reported induction of luteal 20alpha-hydroxy steroid dehydrogenase by administration of aminoglutethimide to late-pregnant rats was shown to be unaffected by prior removal of the foetuses. Aminoglutethimide therefore does not act via the foetuses in this context. 2. The ability of injected oestrogen to prevent the above induction was lost by delaying the injection for 12h after aminoglutethimide, although the increase in enzyme activity begins only after 24h. 3. Induction of 20alpha-hydroxy steroid dehydrogenase by foetoplacental removal on day 18 of pregnancy was inhibited by human choriogonadotropin, lutropin (luteinizing hormone) and pregnant-mare serum gonadotropin, but not by somatotropin (growth hormone), thyrotropin or follitropin (follicle-stimulating hormone) 4. Indomethacin blocked the normal induction of 20alpha-hydroxy steroid dehydrogenase in late pregnancy and that caused by aminoglutethimide. It partially blocked that caused by human choriogonadotropin given on days 19-20 and that caused by 2-bromo-alpha-ergocryptine on days 5-6, but failed to block that caused by human choriogonadotropin on days 15-16 or by foetoplacental removal on day 18 of pregnancy. 5. These findings, and the control of progesterone synthesis in late pregnancy, are interpreted in terms of a sequence of hormonal or enzymic syntheses, each of which is inhibited by the product of the preceding synthesis.
| Medienart: |
Artikel |
|---|
| Erscheinungsjahr: |
1976 |
|---|---|
| Erschienen: |
1976 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:160 |
|---|---|
| Enthalten in: |
The Biochemical journal - 160(1976), 3 vom: 15. Dez., Seite 663-70 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Smith, D H [VerfasserIn] |
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| Anmerkungen: |
Date Completed 21.03.1977 Date Revised 01.05.2019 published: Print Citation Status MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM009972544 |
|---|
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| 007 | tu | ||
| 008 | 231221s1976 xx ||||| 00| ||eng c | ||
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| 035 | |a (DE-627)NLM009972544 | ||
| 035 | |a (NLM)1016247 | ||
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| 041 | |a eng | ||
| 100 | 1 | |a Smith, D H |e verfasserin |4 aut | |
| 245 | 1 | 2 | |a A proposed sequence of hormones controlling the induction of luteal 20alpha-hydroxy steroid dehydrogenase and progesterone withdrawal in the late-pregnant rat |
| 264 | 1 | |c 1976 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ohne Hilfsmittel zu benutzen |b n |2 rdamedia | ||
| 338 | |a Band |b nc |2 rdacarrier | ||
| 500 | |a Date Completed 21.03.1977 | ||
| 500 | |a Date Revised 01.05.2019 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a 1. The previously reported induction of luteal 20alpha-hydroxy steroid dehydrogenase by administration of aminoglutethimide to late-pregnant rats was shown to be unaffected by prior removal of the foetuses. Aminoglutethimide therefore does not act via the foetuses in this context. 2. The ability of injected oestrogen to prevent the above induction was lost by delaying the injection for 12h after aminoglutethimide, although the increase in enzyme activity begins only after 24h. 3. Induction of 20alpha-hydroxy steroid dehydrogenase by foetoplacental removal on day 18 of pregnancy was inhibited by human choriogonadotropin, lutropin (luteinizing hormone) and pregnant-mare serum gonadotropin, but not by somatotropin (growth hormone), thyrotropin or follitropin (follicle-stimulating hormone) 4. Indomethacin blocked the normal induction of 20alpha-hydroxy steroid dehydrogenase in late pregnancy and that caused by aminoglutethimide. It partially blocked that caused by human choriogonadotropin given on days 19-20 and that caused by 2-bromo-alpha-ergocryptine on days 5-6, but failed to block that caused by human choriogonadotropin on days 15-16 or by foetoplacental removal on day 18 of pregnancy. 5. These findings, and the control of progesterone synthesis in late pregnancy, are interpreted in terms of a sequence of hormonal or enzymic syntheses, each of which is inhibited by the product of the preceding synthesis | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Abortion, Induced | |
| 650 | 4 | |a Alkaloids | |
| 650 | 4 | |a Animals, Laboratory | |
| 650 | 4 | |a Biology | |
| 650 | 4 | |a Clinical Research | |
| 650 | 4 | |a Endocrine System | |
| 650 | 4 | |a Enzymatic Effects | |
| 650 | 4 | |a Enzyme Inhibitors | |
| 650 | 4 | |a Enzymes And Enzyme Inhibitors | |
| 650 | 4 | |a Ergot Alkaloids | |
| 650 | 4 | |a Estrogens | |
| 650 | 4 | |a Estrone | |
| 650 | 4 | |a Family Planning | |
| 650 | 4 | |a Fertility Control, Postconception | |
| 650 | 4 | |a Gonadotropins | |
| 650 | 4 | |a Gonadotropins, Chorionic | |
| 650 | 4 | |a Gonadotropins, Pituitary | |
| 650 | 4 | |a Hormones | |
| 650 | 4 | |a Ingredients And Chemicals | |
| 650 | 4 | |a Luteinizing Hormone | |
| 650 | 4 | |a Organic Chemicals | |
| 650 | 4 | |a Physiology | |
| 650 | 4 | |a Pregnancy--side effects | |
| 650 | 4 | |a Progesterone | |
| 650 | 4 | |a Reproduction | |
| 650 | 4 | |a Research Methodology | |
| 650 | 7 | |a Gonadotropins |2 NLM | |
| 650 | 7 | |a Aminoglutethimide |2 NLM | |
| 650 | 7 | |a 0O54ZQ14I9 |2 NLM | |
| 650 | 7 | |a Progesterone |2 NLM | |
| 650 | 7 | |a 4G7DS2Q64Y |2 NLM | |
| 650 | 7 | |a Hydroxysteroid Dehydrogenases |2 NLM | |
| 650 | 7 | |a EC 1.1.- |2 NLM | |
| 650 | 7 | |a Indomethacin |2 NLM | |
| 650 | 7 | |a XXE1CET956 |2 NLM | |
| 700 | 1 | |a Kuhn, N J |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The Biochemical journal |d 1906 |g 160(1976), 3 vom: 15. Dez., Seite 663-70 |w (DE-627)NLM000013498 |x 1470-8728 |7 nnns |
| 773 | 1 | 8 | |g volume:160 |g year:1976 |g number:3 |g day:15 |g month:12 |g pages:663-70 |
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| 951 | |a AR | ||
| 952 | |d 160 |j 1976 |e 3 |b 15 |c 12 |h 663-70 | ||