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Updated: Apr 28, 2026

Quantifying Agonist Activity at G Protein-coupled Receptors
Published on: December 26, 2011
Constitutive activity in gonadotropin receptors
Alfredo Ulloa-Aguirre1, Eric Reiter2, George Bousfield3
1Studium Consortium for Research and Training in Reproductive Sciences (sCORTS), Tours, France; Research Support Network, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán" and Universidad Nacional Autónoma de México, México D.F., Mexico.
Constitutively active mutants (CAMs) of gonadotropin receptors are rare. Research explores their mechanisms, potential phenotypes in women, and therapeutic strategies for these receptor CAMs.
Area of Science:
- Endocrinology
- Molecular Biology
- Genetics
Background:
- Constitutively active mutants (CAMs) of gonadotropin receptors are uncommon genetic conditions.
- Luteinizing hormone-choriogonadotropin receptor (LHCGR) CAMs cause precocious puberty in males, but female phenotypes remain unknown.
- Follicle-stimulating hormone receptor (FSHR) CAMs are rarely identified, with one linked to male hypogonadism and others to ovarian hyperstimulation syndrome.
Purpose of the Study:
- To summarize structural features, functional consequences, and mechanisms of gonadotropin receptor CAMs.
- To discuss potential phenotypes of isolated FSHR and LHCGR CAMs in females.
- To review pharmacological approaches for modulating gonadotropin receptor CAM function.
Main Methods:
- Review of existing literature on gonadotropin receptor CAMs.
- Analysis of mutagenesis and computational studies on receptor activation mechanisms.
- Examination of data from animal models studying enhanced gonadotropin action.
Main Results:
- A common mechanism involves the disruption of interhelical interactions in transmembrane domains 3 and 6.
- This disruption increases solvent accessibility in cytosolic extensions, involving the conserved Glu/Asp-Arg-Tyr/Trp motif.
- Animal models provide insights into potential human phenotypes and translational applications.
Conclusions:
- Understanding gonadotropin receptor CAMs is crucial for diagnosing and potentially treating related endocrine disorders.
- Further research, including studies on animal models, can elucidate unknown phenotypes and guide therapeutic development.
- Pharmacological modulation offers a potential strategy for managing the effects of these receptor CAMs.
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