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Joined 2026-09-21 Message
Incoming links: Androgen
Androgen 2026-11-05
An androgen is a hormone that promotes development and maintenance of male sex characteristics. Endogenous examples include testosterone and dihydrotestosterone. The term identifies a class of biological signals, while each member has its own chemical structure and metabolic transformations.[ref][ref]
Classifying a hormone by an important function does not specify every location where it is made: testosterone is produced prominently by the testis and also in smaller amounts by the ovary.[ref]
Two conversions illustrate why the individual compound still matters. Reduction of testosterone produces the androgen dihydrotestosterone; aromatase instead can convert testosterone into the estrogen estradiol.[ref]
Improved FSH sensitisation and aromatase assay in human granulosa-lutein cells by A. Lambert and others. Abstract, substrate challenge and estradiol production
Following total steroid material would not distinguish those outcomes. A useful assay names the precursor, product and relevant response, rather than treating every related steroid as the same hormonal signal. Aromatase 2026-11-05
Aromatase is an enzyme that converts androgens such as testosterone into estrogens, including estradiol. Its activity links the availability of a precursor substrate to production of a chemically different hormonal signal. The amount of enzyme, available substrate and accumulated product are separate quantities.[ref]
Improved FSH sensitisation and aromatase assay in human granulosa-lutein cells by A. Lambert and others. Abstract, androgen-to-estrogen conversion and assay design
A 2000 experiment made that distinction useful. Researchers cultured human granulosa-lutein cells, stimulated them with follicle-stimulating hormone, then washed the cells and supplied testosterone for a two-hour challenge. They measured secreted estradiol. Separating the longer stimulation period from the short substrate challenge reduced the confounding effect of progressively depleting testosterone during culture.[ref]
Improved FSH sensitisation and aromatase assay in human granulosa-lutein cells by A. Lambert and others. Abstract, preincubation, FSH stimulation, wash and substrate challenge
The experiment illustrates how an enzyme assay can distinguish regulatory induction from immediate catalytic performance. A larger accumulated product amount could otherwise reflect more active enzyme, more available substrate, or a longer reaction time. It is the controlled comparison, not the product measurement alone, that supports an interpretation of altered aromatase activity.
Theca cell 2026-11-05
A theca cell is a somatic cell in the layers surrounding the granulosa cell compartment of a growing ovarian follicle. The steroid-producing thecal population responds to luteinizing hormone and supplies androgens that can become substrates for aromatase in granulosa cells. This division of biochemical work helps connect two cell populations to ovarian estrogen production.[ref]
Anatomy and Physiology 2e by J. Gordon Betts and others. Section27.2: follicular theca and granulosa endocrine functions
A 1995 experiment cultured human theca cells for four days and measured release of the androgen androstenedione. Insulin and related growth-factor treatments altered steroid output, with stronger effects in the presence of luteinizing hormone, while the tested treatments did not stimulate cell growth. The experiment separated a change in endocrine activity from a simple increase in cell number.[ref]
Metabolic regulation of androgen production by human thecal cells in vitro by R. Nahum and others. Abstract: serum-free cultures, androstenedione assay and growth measurements
An illustrative pathway therefore follows substrate rather than treating every ovarian cell as interchangeable: production of an androgen in one population can support conversion to an estrogen in another. Measuring the final product alone does not identify which upstream population changed its activity.