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• W2953476200 endingPage "107386" @default.
• W2953476200 startingPage "107386" @default.
• W2953476200 abstract "The existence of specific binding sites for benzodiazepines (BZs) in the brain has prompted the search for endogenous BZ receptor ligands designated by the generic term « endozepines ». This has led to the identification of an 86-amino acid polypeptide capable of displacing [3H]diazepam binding to brain membranes, thus called diazepam-binding inhibitor (DBI). It was subsequently found that the sequence of DBI is identical to that of a lipid carrier protein termed acyl-CoA-binding protein (ACBP). The primary structure of DBI/ACBP has been well preserved, suggesting that endozepines exert vital functions. The DBI/ACBP gene is expressed by astroglial cells in the central nervous system, and by various cell types in peripheral organs. Endoproteolytic cleavage of DBI/ACBP generates several bioactive peptides including a triakontatetraneuropeptide that acts as a selective ligand of peripheral BZ receptors/translocator protein, and an octadecaneuropeptide that activates a G protein-coupled receptor and behaves as an allosteric modulator of the GABAAR. Although DBI/ACBP is devoid of a signal peptide, endozepines are released by astrocytes in a regulated manner. Consistent with the diversity and wide distribution of BZ-binding sites, endozepines appear to exert a large array of biological functions and pharmacological effects. Thus, intracerebroventricular administration of DBI or derived peptides induces proconflict and anxiety-like behaviors, and reduces food intake. Reciprocally, the expression of DBI/ACBP mRNA is regulated by stress and metabolic signals. In vitro, endozepines stimulate astrocyte proliferation and protect neurons and astrocytes from apoptotic cell death. Endozepines also regulate neurosteroid biosynthesis and neuropeptide expression, and promote neurogenesis. In peripheral organs, endozepines activate steroid hormone production, stimulate acyl chain ceramide synthesis and trigger pro-inflammatory cytokine secretion. The expression of the DBI/ACBP gene is enhanced in addiction/withdrawal animal models, in patients with neurodegenerative disorders and in various types of tumors. We review herein the current knowledge concerning the various actions of endozepines and discuss the physiopathological implications of these regulatory gliopeptides." @default.
• W2953476200 created "2019-07-12" @default.
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• W2953476200 date "2020-04-01" @default.
• W2953476200 modified "2023-10-10" @default.
• W2953476200 title "Endozepines and their receptors: Structure, functions and pathophysiological significance" @default.
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