Beta-amyloid peptide stimulates endozepine release in cultured rat astrocytes through activation of N -formyl peptide receptors - Normandie Université Access content directly
Journal Articles Glia Year : 2008

Beta-amyloid peptide stimulates endozepine release in cultured rat astrocytes through activation of N -formyl peptide receptors

Abstract

Astroglial cells synthesize and release endozepines, a family of neuropeptides derived from diazepam-binding inhibitor (DBI). The authors have recently shown that beta-amyloid peptide (Abeta) stimulates DBI gene expression and endozepine release. The purpose of this study was to determine the mechanism of action of Abeta in cultured rat astrocytes. Abeta(25-35) and the N-formyl peptide receptor (FPR) agonist N-formyl-Met-Leu-Phe (fMLF) increased the secretion of endozepines in a dose-dependent manner with EC(50) value of approximately 2 microM. The stimulatory effects of Abeta(25-35) and the FPR agonists fMLF and N-formyl-Met-Met-Met (fMMM) on endozepine release were abrogated by the FPR antagonist N-t-Boc-Phe-Leu-Phe-Leu-Phe. In contrast, Abeta(25-35) increased DBI mRNA expression through a FPR-independent mechanism. Abeta(25-35) induced a transient stimulation of cAMP formation and a sustained activation of polyphosphoinositide turnover. The stimulatory effect of Abeta(25-35) on endozepine release was blocked by the adenylyl cyclase inhibitor somatostatin, the protein kinase A (PKA) inhibitor H89, the phospholipase C inhibitor U73122, the protein kinase C (PKC) inhibitor chelerythrine and the ATP binding cassette transporter blocker glyburide. Taken together, these data demonstrate for the first time that Abeta(25-35) stimulates endozepine release from rat astrocytes through a FPR receptor positively coupled to PKA and PKC.

Dates and versions

hal-01974262 , version 1 (08-01-2019)

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Tursonjan Tokay, Raya Hachem, Olfa Masmoudi-Kouki, Pierrick Gandolfo, Laurence Desrues, et al.. Beta-amyloid peptide stimulates endozepine release in cultured rat astrocytes through activation of N -formyl peptide receptors. Glia, 2008, 56 (13), pp.1380-1389. ⟨10.1002/glia.20705⟩. ⟨hal-01974262⟩
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