TY - JOUR
T1 - Cholesterol modulates α-secretase cleavage of amyloid precursor protein
AU - Bodovitz, Steven
AU - Klein, William L.
PY - 1996/2/23
Y1 - 1996/2/23
N2 - Amyloid precursor protein (APP) and cholesterol metabolism are genetically linked to Alzheimer's disease, the latter through apolipoprotein E, a lipid and cholesterol transport protein. We have examined the hypothesis that the processing of APP is disrupted by elevated cholesterol, which is known to modulate the activity of several transmembrane protein. In the current study, cholesterol, solubilized by methyl-β-cyclodextrin or ethanol, was added to the culture media of APP 751 stably transfected HEK 293 cells. Radiolabeled APP and APP(sol) (the soluble N-terminal derivative following α-secretase cleavage) were precipitated from lysates and conditioned media of stably transfected HEK 293 cells; the relative levels were determined by quantitative densitometry following separation by SDS-polyacrylamide gel electrophoresis. The data show that cholesterol, solubilized by methyl-β- cyclodextrin, greatly reduced the levels of APP(sol). Low doses of ethanol- solubilized cholesterol similarly caused a dramatic reduction of APP(sol). By contrast, levels of APP holoprotein remained the same or increased. The large decrease seen in APP(sol) production was not due to nonspecific inhibition of secretion because several secreted proteins increased in level. Cholesterol, which impedes membrane fluidity, may lower APP(sol) production by impeding the interaction of the substrate with its protease(s). If APP(sol) were to function trophically, as suggested by other studies, the current conclusion suggests that changes in cellular cholesterol levels in Alzheimer's disease could contribute to neuronal degeneration by decreasing the production of APP(sol).
AB - Amyloid precursor protein (APP) and cholesterol metabolism are genetically linked to Alzheimer's disease, the latter through apolipoprotein E, a lipid and cholesterol transport protein. We have examined the hypothesis that the processing of APP is disrupted by elevated cholesterol, which is known to modulate the activity of several transmembrane protein. In the current study, cholesterol, solubilized by methyl-β-cyclodextrin or ethanol, was added to the culture media of APP 751 stably transfected HEK 293 cells. Radiolabeled APP and APP(sol) (the soluble N-terminal derivative following α-secretase cleavage) were precipitated from lysates and conditioned media of stably transfected HEK 293 cells; the relative levels were determined by quantitative densitometry following separation by SDS-polyacrylamide gel electrophoresis. The data show that cholesterol, solubilized by methyl-β- cyclodextrin, greatly reduced the levels of APP(sol). Low doses of ethanol- solubilized cholesterol similarly caused a dramatic reduction of APP(sol). By contrast, levels of APP holoprotein remained the same or increased. The large decrease seen in APP(sol) production was not due to nonspecific inhibition of secretion because several secreted proteins increased in level. Cholesterol, which impedes membrane fluidity, may lower APP(sol) production by impeding the interaction of the substrate with its protease(s). If APP(sol) were to function trophically, as suggested by other studies, the current conclusion suggests that changes in cellular cholesterol levels in Alzheimer's disease could contribute to neuronal degeneration by decreasing the production of APP(sol).
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U2 - 10.1074/jbc.271.8.4436
DO - 10.1074/jbc.271.8.4436
M3 - Article
C2 - 8626795
AN - SCOPUS:0029671454
VL - 271
SP - 4436
EP - 4440
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 8
ER -