Acute action of choriogonadotropin on Leydig tumor cells: changes in the topography of the mitochondrial peripheral-type benzodiazepine receptor
Abstract
We examined the topography of the MA-10 Leydig tumor cell mitochondrial peripheral-type benzodiazepine receptor (PBR). In previous studies, the 18 kDa PBR was found to be functionally associated with the voltage-dependent anion channel, located in the junctions between outer and inner membranes. Transmission electron (TEM) and atomic force microscopy (AFM) of immunogold labeled PBR on Leydig cell mitochondrial preparations showed that the 18 kDa PBR protein is organized in clusters of 4-6 molecules. Addition of hCG to Leydig cells induces a rapid, within 30 sec, increase in PBR ligand binding and morphological changes, namely redistribution of PBR molecules in large clusters (>7 particles). These hCG-induced changes were inhibited by a cAMP-dependent protein kinase inhibitor and by the benzodiazepine flunitrazepam. AFM further demonstrated the rapid reorganization of the mitochondrial membrane, where the formation of contacts between the outer and the inner mitochondrial membrane may facilitate cholesterol transfer.
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Hormonal stimulation of steroidogenesis in a steroidogenic cell model resulted in increased TSPO polymerization in correlation with increased ligand-binding affinity and steroid production.
“Hormonal stimulation of steroidogenesis in a steroidogenic cell model resulted in increased TSPO polymerization in correlation with increased ligand-binding affinity and steroid production (123, 124).”
From Adrenal Mitochondria and Steroidogenesis: From Individual Proteins to Functional Protein Assemblies (2016) · cites this paper as [123]
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- Authors
- Boujrad, N.
- Affiliations
- Georgetown University Medical Center (US)
- Venue
- Endocrinology
- Publisher
- The Endocrine Society
- Published
- 1996-12-01
- Volume
- 137
- Issue
- 12
- Pages
- 5727-5730
- ISSN
- 0013-7227 (ISSN-L)
- OpenAlex
- W2100769150
- Cited by
- 62
- References
- 12
- Citations by year
- 2024: 1 · 2021: 1 · 2020: 2 · 2019: 1 · 2018: 2 · 2016: 2 · 2015: 1 · 2014: 3 · 2013: 1 · 2012: 3
- FWCI
- 1.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5k04hd001031-04)
- National Institute of Environmental Health Sciences (R01ES007747, ES 07747)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD-01031)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
- Keywords
- choriogonadotropin, Leydig tumor cells, translocator protein (TSPO), receptor topography, receptor clustering, voltage-dependent anion channel, cholesterol transfer, protein kinase A, flunitrazepam
- MeSH terms
- Animals, Flunitrazepam, Gold, Chorionic Gonadotropin, Isoquinolines, Leydig Cell Tumor, Microscopy, Electron, Mitochondria, Receptors, GABA-A, Sulfonamides, Time Factors, Tissue Distribution, Tumor Cells, Cultured, Microscopy, Atomic Force, GABA Modulators, Mice
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