Effect of energy shortage and oxidative stress on amyloid precursor protein metabolism in COS cells.
The present study investigates the influence of energy related metabolic stress on amyloid precursor protein (APP) non-amyloidogenic secretory processing in COS cells. The effect of glucose deprivation on soluble APP (sAPP) secretion has been evaluated: incubation of COS cells with 50 mM 2-deoxy-D-glucose (2-DG) in glucose free medium was able to reduce sAPP secretion (-26%). Sodium azide (NaN3), an inhibitor of cytochrome c oxidase (complex IV of the mitochondrial electron transfer chain) decreased sAPP release in a concentration dependent way (maximum -75%). Treatment of COS cells with the antioxidant glutathione (GSH) fully antagonized the inhibitory effect of azide (1 mM) and elicited sAPP release over basal level. These results suggest that the inhibition of energy metabolism can influence APP processing leading to a decreased secretion of non-amyloidogenic fragments of APP.
Gasparini
L
L
A.Fa.R., I.R.C.C.S San Giovanni di Dio, Alzheimer's Disease Unit Sacred Heart Hospital-FBF, Brescia, Italy.
Racchi
M
M
Benussi
L
L
Curti
D
D
Binetti
G
G
Bianchetti
A
A
Trabucchi
M
M
Govoni
S
S
D016564:Amyloid beta-Protein Precursor / Q000378:metabolism*; D000818:Animals; D000963:Antimetabolites / Q000494:pharmacology; D001386:Azides / Q000494:pharmacology; D019556:COS Cells / Q000737:chemistry / Q000187:drug effects / Q000201:enzymology*; D003847:Deoxyglucose / Q000494:pharmacology; D003576:Electron Transport Complex IV / Q000378:metabolism; D004734:Energy Metabolism / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005947:Glucose / Q000494:pharmacology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology*; D019810:Sodium Azide
D016564:Amyloid beta-Protein Precursor; D000963:Antimetabolites; D001386:Azides; D004791:Enzyme Inhibitors; D019810:Sodium Azide; D003847:Deoxyglucose; D007770:L-Lactate Dehydrogenase; D003576:Electron Transport Complex IV; D005947:Glucose