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Amyloid beta enhances cytosolic phospholipase A2 level and arachidonic acid release via nitric oxide in APP-transfected PC12 cells

Chalimoniuk, Ma?gorzata and Stolecka, Anna and Caka?a, Magdalena and Hauptmann, Susane and Schulz, Kris and Lipka, Uta and Leuner, Kristine and Eckert, Anne and Muller, Walter E. and Strosznajder, Joanna B.. (2007) Amyloid beta enhances cytosolic phospholipase A2 level and arachidonic acid release via nitric oxide in APP-transfected PC12 cells. Acta biochimica Polonica, Vol. 54, Nr. 3. pp. 611-623.

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Official URL: http://edoc.unibas.ch/dok/A5253452

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Abstract

Cytosolic phospholipase A2 (cPLA2) preferentially liberates arachidonic acid (AA), which is known to be elevated in Alzheimer's disease (AD). The aim of this study was to investigate the possible relationship between enhanced nitric oxide (NO) generation observed in AD and cPLA2 protein level, phosphorylation, and AA release in rat pheochromocytoma cell lines (PC12) differing in amyloid beta secretion. PC12 control cells, PC12 cells bearing the Swedish double mutation in amyloid beta precursor protein (APPsw), and PC12 cells transfected with human APP (APPwt) were used. The transfected APPwt and APPsw PC12 cells showed an about 2.8- and 4.8-fold increase of amyloid beta (Abeta) secretion comparing to control PC12 cells. An increase of NO synthase activity, cGMP and free radical levels in APPsw and APPwt PC12 cells was observed. cPLA2 protein level was higher in APPsw and APPwt PC12 cells comparing to PC12 cells. Moreover, phosphorylated cPLA2 protein level and [3H]AA release were also higher in APP-transfected PC12 cells than in the control PC12 cells. An NO donor, sodium nitroprusside, stimulated [3H]AA release from prelabeled cells. The highest NO-induced AA release was observed in control PC12 cells, the effect in the other cell lines being statistically insignificant. Inhibition of cPLA2 by AACOCF3 significantly decreased the AA release. Inhibitors of nNOS and gamma-secretase reduced AA release in APPsw and APPwt PC12 cells. The basal cytosolic [Ca2+](i) and mitochondrial Ca2+ concentration was not changed in all investigated cell lines. Stimulation with thapsigargin increased the cytosolic and mitochondrial Ca2+ level, activated NOS and stimulated AA release in APP-transfected PC12 cells. These results indicate that Abeta peptides enhance the protein level and phosphorylation of cPLA2 and AA release by the NO signaling pathway.
Faculties and Departments:03 Faculty of Medicine > Bereich Psychiatrie (Klinik) > Erwachsenenpsychiatrie UPK
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Psychiatrie (Klinik) > Erwachsenenpsychiatrie UPK
UniBasel Contributors:Eckert, Anne
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Państwowe Wydawnictwo Naukowe
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:23
Deposited On:22 Mar 2012 13:36

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