Abstract:
:The term endozepines designates a family of astroglia-secreted proteins including the diazepambinding inhibitor (DBI) and its processing products, which have been originally isolated and characterized as endogenous ligands of benzodiazepine receptors. It is now clearly established that the octadecaneuropeptide ODN (DBI33-50), acting through the central-type benzodiazepine receptor or a metabotropic receptor, exerts important functions such as proconflict behavior, induction of anxiety, inhibition of pentobarbital-provoked sleep, decrease of water consumption and reduction of food intake. To mediate its effects, ODN regulates both glial cell and neuronal activities by acting on neurosteroid biosynthesis and/or neuropeptide expression. In addition, ODN stimulates astrocyte proliferation and protects both neurons and astrocytes from oxidative stress-induced cell death. The antiapoptotic effect of ODN on neural cells is mediated through activation of the ODN metabotropic receptor positively coupled to PKA, PKC and MAPK/ERK transduction pathways, which ultimately reduces the pro-apoptotic gene Bax and stimulates Bcl-2 expressions, and inhibits intracellular reactive oxygen species accumulation. The imbalance in favor of Bcl2 promotes mitochondria functions and blocks in turn caspases activation while at the same time, ODN also activates the endogenous antioxidant system i.e. glutathione biosynthesis, and expression and activities of antioxidant enzymes. In cultured astrocytes, DBI expression is up-regulated during moderate oxidative stress, and authentic ODN production is increased, suggesting that ODN may act as a paracrine factor protecting neighboring neurons. Taken together, the remarkable effect of ODN on the apoptotic cascade suggests that innovative ODN derivatives could potentially be useful for treatment of cerebral injuries involving oxidative stress and neurodegeneration.
journal_name
Curr Pharm Desjournal_title
Current pharmaceutical designauthors
Masmoudi-Kouki O,Hamdi Y,Ghouili I,Bahdoudi S,Kaddour H,Leprince J,Castel H,Vaudry H,Amri M,Vaudry D,Tonon MCdoi
10.2174/1381612824666181112111746subject
Has Abstractpub_date
2018-01-01 00:00:00pages
3918-3925issue
33eissn
1381-6128issn
1873-4286pii
CPD-EPUB-94431journal_volume
24pub_type
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