Follicle-stimulating hormone 2026-11-05
Follicle-stimulating hormone is a glycoprotein gonadotropin released by gonadotrophs in the anterior pituitary. It supports ovarian follicle growth and acts on granulosa cells in the ovary and Sertoli cells in the testis. Its effects depend on target-cell receptors, not solely on the amount of circulating hormone.[ref]
Anatomy and Physiology 2e by J. Gordon Betts and others. §17.3, pituitary hormone summary and follicular growth
[ref]A 1997 experiment disrupted the gene encoding the hormone's FSH beta subunit, producing mice deficient in follicle-stimulating hormone. Female mice were infertile, with follicle development blocked before antral follicle formation. Males remained fertile despite smaller testes.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Abstract, targeted deficiency and contrasting reproductive outcomes
The contrast separates several outcomes that a single word like “fertility” can obscure. It demonstrates that loss of the same hormonal signal can affect ovarian development, testicular size and successful reproduction differently in this mouse model. Those endpoints must be measured separately rather than inferred from one another.
Follicle-stimulating hormone beta subunit 2026-11-05
The FSH beta subunit is the hormone-specific protein subunit of follicle-stimulating hormone. The active hormone is a heterodimer: its beta chain associates with an alpha chain shared with related glycoprotein hormones, including luteinizing hormone and thyroid-stimulating hormone. The isolated beta chain and the assembled protein complex are therefore different experimental objects.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Abstract, common alpha chain, specific beta chains and heterodimer-dependent activity
A 1997 gene knockout experiment removed production of the FSH beta subunit in mice, producing deficiency of follicle-stimulating hormone. Females could not complete normal ovarian follicle development and were infertile; males retained fertility despite reduced testis size. The contrast shows how disrupting one component can test a proposed requirement for the assembled signal.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Abstract, targeted beta-subunit deficiency and sex-dependent outcomes
This result concerns a particular genetic perturbation and measured outcomes in mice. It does not imply that every function of follicle-stimulating hormone is dispensable in males, nor that a shared alpha chain makes these hormones interchangeable.
Gonadotropin 2026-11-05
A gonadotropin is a hormone that regulates development or function of the gonads. The pituitary examples are follicle-stimulating hormone and luteinizing hormone, released by gonadotrophs in the anterior pituitary. Gonadotropin-releasing hormone acts upstream to stimulate their release; its name does not make it identical to either pituitary output.[ref]
Anatomy and Physiology 2e by J. Gordon Betts and others. §17.3, Follicle-Stimulating Hormone and Luteinizing Hormone
The two pituitary gonadotropins are glycoproteins assembled from two subunits. They share a common alpha subunit while their hormone-specific beta subunits differ.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Abstract, shared alpha, specific beta and biological activity of the heterodimer
This provides a useful specificity problem. Detecting the shared component alone would not identify which complete hormone was present. An informative measurement or perturbation must distinguish the relevant assembled molecule or its specific component. Classification by target action, molecular composition and measured concentration consequently addresses three related but different questions.
T. R. Kumar (FSH researcher) 2026-11-05
T. R. Kumar is the researcher who led a 1997 study of the function of follicle-stimulating hormone in mouse reproduction. The study used a gene knockout affecting the hormone-specific follicle-stimulating hormone beta subunit, producing mice deficient in the active hormone.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Byline and Abstract: targeted FSH-beta deficiency
The outcomes differed between sexes. Females were infertile because ovarian follicle development stopped before formation of an antral cavity. Males retained reproductive capability despite having reduced testis size. The experiment therefore distinguished a requirement for normal organ development from an absolute requirement for the measured reproductive endpoint.[ref]
Follicle stimulating hormone is required for ovarian follicle maturation but not male fertility by T. R. Kumar and others. Abstract: female preantral arrest and male fertility despite reduced testicular size
For example, observing an altered organ size and observing failure to produce offspring answer different questions. The same perturbation can affect both endpoints to different degrees. These mouse results established a specific experimentally tested distinction; they do not by themselves determine the outcome of every reduction in follicle-stimulating hormone in another species.