Biomaterial Database

Gonadotropin-dependent and gonadotropin-independent development of inhibin subunit messenger ribonucleic acid levels in the mouse ovary. 1995

P J O'Shaughnessy, and S A Gray

Department of Veterinary Physiology, University of Glasgow Veterinary School, United Kingdom.

The inhibins and activins are dimeric growth factors with important regulatory functions during development. In this study, changes in inhibin subunit messenger RNA (mRNA) levels were measured in the ovary during early postnatal development in the normal mouse and the hypogonadal (hpg) mouse, which lacks circulating gonadotropins. Levels of inhibin alpha-, beta A-, and beta B-subunit mRNAs were measured relative to beta-actin using a semiquantitative reverse transcription-polymerase chain reaction technique. Transcripts encoding all three subunits were present at birth; the alpha-subunit was the most abundant, followed by beta A-subunit (6% of alpha) and beta B-subunit (0.4% of alpha). After birth, levels of all three subunit transcripts increased between 6- and 10-fold. Changes in inhibin beta A- and beta B-subunit levels were most marked around 7 days, the period of secondary follicle development, whereas alpha-subunit transcript levels increased constantly after day 1 to reach a peak at 10 days, when mature secondary follicles are present. In hpg mice, levels of ovarian inhibin alpha-subunit mRNA levels were normal at all ages up to 15 days. In contrast, inhibin beta A-subunit mRNA levels were normal at birth in hpg mice, but did not increase after that up to day 15. Levels of beta B-subunit mRNA were significantly lower than normal on day 1 in hpg mice and also failed to show a significant increase up to 15 days. These results show that inhibin subunit mRNA levels are differentially regulated during ovarian development in the mouse. Normal expression of beta-subunits is completely gonadotropin dependent around the period of late primary to secondary follicle development. The inhibin alpha-subunit, in contrast, is expressed at a high level during development independent of gonadotropin stimulation.

UI	MeSH Term	Description	Entries
D007006	Hypogonadism	Condition resulting from deficient gonadal functions, such as GAMETOGENESIS and the production of GONADAL STEROID HORMONES. It is characterized by delay in GROWTH, germ cell maturation, and development of secondary sex characteristics. Hypogonadism can be due to a deficiency of GONADOTROPINS (hypogonadotropic hypogonadism) or due to primary gonadal failure (hypergonadotropic hypogonadism).	Hypergonadotropic Hypogonadism,Hypogonadism, Isolated Hypogonadotropic,Hypogonadotropic Hypogonadism,Hypogonadism, Hypergonadotropic,Hypogonadism, Hypogonadotropic
D007265	Inhibins	Glycoproteins that inhibit pituitary FOLLICLE STIMULATING HORMONE secretion. Inhibins are secreted by the Sertoli cells of the testes, the granulosa cells of the ovarian follicles, the placenta, and other tissues. Inhibins and ACTIVINS are modulators of FOLLICLE STIMULATING HORMONE secretions; both groups belong to the TGF-beta superfamily, as the TRANSFORMING GROWTH FACTOR BETA. Inhibins consist of a disulfide-linked heterodimer with a unique alpha linked to either a beta A or a beta B subunit to form inhibin A or inhibin B, respectively	Female Inhibin,Inhibin,Inhibin-F,Inhibins, Female,Inhibins, Testicular,Ovarian Inhibin,Testicular Inhibin,Female Inhibins,Inhibin F,Inhibin, Female,Inhibin, Ovarian,Inhibin, Testicular,Testicular Inhibins
D008817	Mice, Mutant Strains	Mice bearing mutant genes which are phenotypically expressed in the animals.	Mouse, Mutant Strain,Mutant Mouse Strain,Mutant Strain of Mouse,Mutant Strains of Mice,Mice Mutant Strain,Mice Mutant Strains,Mouse Mutant Strain,Mouse Mutant Strains,Mouse Strain, Mutant,Mouse Strains, Mutant,Mutant Mouse Strains,Mutant Strain Mouse,Mutant Strains Mice,Strain Mouse, Mutant,Strain, Mutant Mouse,Strains Mice, Mutant,Strains, Mutant Mouse
D008969	Molecular Sequence Data	Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.	Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D010053	Ovary	The reproductive organ (GONADS) in female animals. In vertebrates, the ovary contains two functional parts: the OVARIAN FOLLICLE for the production of female germ cells (OOGENESIS); and the endocrine cells (GRANULOSA CELLS; THECA CELLS; and LUTEAL CELLS) for the production of ESTROGENS and PROGESTERONE.	Ovaries
D005260	Female		Females
D006062	Gonadotropins	Hormones that stimulate gonadal functions such as GAMETOGENESIS and sex steroid hormone production in the OVARY and the TESTIS. Major gonadotropins are glycoproteins produced primarily by the adenohypophysis (GONADOTROPINS, PITUITARY) and the placenta (CHORIONIC GONADOTROPIN). In some species, pituitary PROLACTIN and PLACENTAL LACTOGEN exert some luteotropic activities.	Gonadotropin
D000375	Aging	The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.	Senescence,Aging, Biological,Biological Aging
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001483	Base Sequence	The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.	DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA