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Diazepam binding inhibitor peptide: cloning and gene expression.
1Department of Anatomy and Cell Biology, Georgetown University, School of Medicine, Washington, DC 20007.
Neuropharmacology
|December 1, 1991
Summary
Diazepam binding inhibitor (DBI) peptide is well conserved across species. Its gene expression changes in the brain and peripheral tissues, suggesting diverse functions and a role in benzodiazepine tolerance.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Diazepam binding inhibitor (DBI) is a peptide that influences diazepam binding.
- DBI is a well-conserved peptide across mammalian species, indicating a fundamental biological role.
Purpose of the Study:
- To characterize the function of DBI by investigating its gene expression regulation.
- To explore the role of DBI in benzodiazepine tolerance and its developmental expression in peripheral tissues.
Main Methods:
- Isolation of cDNA clones encoding the full amino acid sequence of DBI from rat brain libraries.
- Analysis of DBI mRNA expression in various rat brain regions and peripheral tissues.
- Pharmacological manipulation to induce diazepam tolerance and assess changes in DBI biosynthesis.
Main Results:
- DBI mRNA expression is uneven across brain regions and peripheral tissues.
- DBI biosynthesis is upregulated in the cerebellum and cerebral cortex of diazepam-tolerant rats.
- DBI mRNA expression exhibits distinct developmental patterns in liver, kidney, and heart.
Conclusions:
- DBI gene expression is regulated in a tissue-specific manner, both pharmacologically and developmentally.
- Changes in DBI biosynthesis may contribute to the development of tolerance to benzodiazepines.
- DBI likely possesses diverse functions in different tissues, potentially including roles in cell metabolism.