Vasoactive intestinal peptide enhances aromatase activity in the neonatal rat ovary before development of primary follicles or responsiveness to follicle-stimulating hormone
We have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity (assessed by measuring the amount of 3H2O formed from [1β -3H]testosterone) is low prior to birth (<0.5 pmol/hr per mg of protein) and increases to values greater than 30 pm...
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Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 84; no. 16; pp. 5803 - 5807 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
National Academy of Sciences of the United States of America
01.08.1987
National Acad Sciences |
Subjects | |
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Abstract | We have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity (assessed by measuring the amount of 3H2O formed from [1β -3H]testosterone) is low prior to birth (<0.5 pmol/hr per mg of protein) and increases to values greater than 30 pmol/hr per mg of protein between days 8 and 12 after birth. The appearance of ovarian aromatase (postnatal days 2-4) coincides with the development of primordial follicles. Fetal-neonatal ovaries maintained in serum-free organ culture do not develop aromatase activity at the expected time. Ovine follicle-stimulating hormone (0.1-1 μ g/ml), ovine luteinizing hormone (0.1 μ g/ml), or their combination failed to induce the enzyme activity in cultured fetal ovaries, whereas follicle-stimulating hormone is effective in preventing the decline in aromatase activity when postnatal day 8 ovaries are placed in culture. In contrast to follicle-stimulating hormone, dibutyryl-cAMP markedly enhances ovarian aromatase in cultured fetal ovaries. Likewise, enhancement of endogenous cAMP formation with forskolin or cholera toxin caused an increase in enzyme activity within 24 hr. Vasoactive intestinal peptide, a peptide known to occur in ovarian nerves, caused a dose-dependent increase in aromatase activity in fetal ovaries prior to folliculogenesis. Of related peptides tested, only the peptide having N-terminal histidine and C-terminal isoleucine amide was capable of inducing aromatase activity in fetal ovaries. The fact that VIP can induce aromatase activity in fetal rat ovaries prior to follicle formation and prior to responsiveness to follicle-stimulating hormone suggests that this neuropeptide may play a critical role in ovarian differentiation. |
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AbstractList | We have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity (assessed by measuring the amount of 3H2O) formed from [1 beta-3H]testosterone) is low prior to birth (less than 0.5 pmol/hr per mg of protein) and increases to values greater than 30 pmol/hr per mg of protein between days 8 and 12 after birth. The appearance of ovarian aromatase (postnatal days 2-4) coincides with the development of primordial follicles. Fetal-neonatal ovaries maintained in serum-free organ culture do not develop aromatase activity at the expected time. Ovine follicle-stimulating hormone (0.1-1 microgram/ml), ovine luteinizing hormone (0.1 microgram/ml), or their combination failed to induce the enzyme activity in cultured fetal ovaries, whereas follicle-stimulating hormone is effective in preventing the decline in aromatase activity when postnatal day 8 ovaries are placed in culture. In contrast to follicle-stimulating hormone, dibutyryl-cAMP markedly enhances ovarian aromatase in cultured fetal ovaries. Likewise, enhancement of endogenous cAMP formation with forskolin or cholera toxin caused an increase in enzyme activity within 24 hr. Vasoactive intestinal peptide, a peptide known to occur in ovarian nerves, caused a dose-dependent increase in aromatase activity in fetal ovaries prior to folliculogenesis. Of related peptides tested, only the peptide having N-terminal histidine and C-terminal isoleucine amide was capable of inducing aromatase activity in fetal ovaries. The fact that VIP can induce aromatase activity in fetal rat ovaries prior to follicle formation and prior to responsiveness to follicle-stimulating hormone suggests that this neuropeptide may play a critical role in ovarian differentiation. We have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity (assessed by measuring the amount of 3H2O formed from [1β -3H]testosterone) is low prior to birth (<0.5 pmol/hr per mg of protein) and increases to values greater than 30 pmol/hr per mg of protein between days 8 and 12 after birth. The appearance of ovarian aromatase (postnatal days 2-4) coincides with the development of primordial follicles. Fetal-neonatal ovaries maintained in serum-free organ culture do not develop aromatase activity at the expected time. Ovine follicle-stimulating hormone (0.1-1 μ g/ml), ovine luteinizing hormone (0.1 μ g/ml), or their combination failed to induce the enzyme activity in cultured fetal ovaries, whereas follicle-stimulating hormone is effective in preventing the decline in aromatase activity when postnatal day 8 ovaries are placed in culture. In contrast to follicle-stimulating hormone, dibutyryl-cAMP markedly enhances ovarian aromatase in cultured fetal ovaries. Likewise, enhancement of endogenous cAMP formation with forskolin or cholera toxin caused an increase in enzyme activity within 24 hr. Vasoactive intestinal peptide, a peptide known to occur in ovarian nerves, caused a dose-dependent increase in aromatase activity in fetal ovaries prior to folliculogenesis. Of related peptides tested, only the peptide having N-terminal histidine and C-terminal isoleucine amide was capable of inducing aromatase activity in fetal ovaries. The fact that VIP can induce aromatase activity in fetal rat ovaries prior to follicle formation and prior to responsiveness to follicle-stimulating hormone suggests that this neuropeptide may play a critical role in ovarian differentiation. The authors have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity. is low prior to birth and increases between days 8 and 12 after birth. The fact that VIP can induce aromatase activity in fetal rat ovaries prior to follicle formation and prior to responsiveness to follicle-stimulating hormone suggests that this neuropeptide may play a critical role in ovarian differentiation. |
Author | George, F.W Ojeda, S.R |
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Keywords | Human Embryonic development Rat Rodentia Estrogen Activation Biosynthesis Cell differentiation Neuropeptide Ovary Vertebrata Peptidergic pathway Mammalia Animal Development FSH New born Sex steroid hormone VIP Ovarian follicle |
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Snippet | We have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity (assessed by measuring the amount... The authors have investigated the factors that regulate aromatase activity in fetal-neonatal rat ovaries. Ovarian aromatase activity. is low prior to birth and... |
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SubjectTerms | ACTIVIDAD ENZIMATICA ACTIVITE ENZYMATIQUE Animals Aromatase - metabolism Biological and medical sciences Bucladesine - pharmacology Cell differentiation, maturation, development, hematopoiesis Cell physiology Cycloheximide - pharmacology Dactinomycin - pharmacology DESARROLLO EMBRIONARIO DEVELOPPEMENT EMBRYONNAIRE EMBRYONIC DEVELOPMENT Endocrinology ENZYMIC ACTIVITY Estrogens Female Follicle Stimulating Hormone - pharmacology Follicles Follicular development FSH Fundamental and applied biological sciences. Psychology GONADOTROPHINE GONADOTROPINAS GONADOTROPINS Gonads HFS Hormones INFANTES INFANTS Luteinizing Hormone - pharmacology Molecular and cellular biology Nerves NOUVEAU-NE Organ Culture Techniques OVAIRE Ovarian Follicle - growth & development OVARIES OVARIOS Ovary - enzymology Ovary - growth & development PEPTIDE PEPTIDES PEPTIDOS Pregnancy RAT RATA RATS Rats, Inbred Strains Sheep Testes Testosterone - metabolism Vasoactive Intestinal Peptide - pharmacology |
Title | Vasoactive intestinal peptide enhances aromatase activity in the neonatal rat ovary before development of primary follicles or responsiveness to follicle-stimulating hormone |
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