Synergistic effects of high fat feeding and apolipoprotein E deletion on enterocytic amyloid-beta abundance.

Lipids in Health and Disease
Susan GallowayJ C L Mamo

Abstract

Amyloid-beta (Abeta), a key protein found in amyloid plaques of subjects with Alzheimer's disease is expressed in the absorptive epithelial cells of the small intestine. Ingestion of saturated fat significantly enhances enterocytic Abeta abundance whereas fasting abolishes expression. Apolipoprotein (apo) E has been shown to directly modulate Abeta biogenesis in liver and neuronal cells but it's effect in enterocytes is not known. In addition, apo E modulates villi length, which may indirectly modulate Abeta as a consequence of differences in lipid absorption. This study compared Abeta abundance and villi length in wild-type (WT) and apo E knockout (KO) mice maintained on either a low-fat or high-fat diet. Wild-type C57BL/6J and apo E KO mice were randomised for six-months to a diet containing either 4% (w/w) unsaturated fats, or chow comprising 16% saturated fats and 1% cholesterol. Quantitative immunohistochemistry was used to assess Abeta abundance in small intestinal enterocytes. Apo E KO mice given the low-fat diet had similar enterocytic Abeta abundance compared to WT controls. The saturated fat diet substantially increased enterocytic Abeta in WT and in apo E KO mice, however the effect was greater in the latter. Villi h...Continue Reading

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Citations

Nov 30, 2011·Journal of Neuroimmune Pharmacology : the Official Journal of the Society on NeuroImmune Pharmacology·Kendra L PuigColin K Combs
Oct 23, 2009·Lipids in Health and Disease·Susan GallowayJohn C L Mamo
Nov 10, 2009·Progress in Lipid Research·R TakechiJ C L Mamo
Oct 18, 2008·Neurobiology of Aging·Carl JulienFrédéric Calon
Mar 7, 2017·Scientific Reports·Kendra L PuigColin K Combs

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Methods Mentioned

BETA
lipidation
gene knockout

Software Mentioned

AxioVision

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