SH-SY5Y cells were transiently transfected using pVectOZ-SEAP plasmid (1µg/transfection)
this article demonstrates the high levels of transgene expression in mammalian cells when using pVectOZ plasmid from OZ Biosciences.article reference: J Neurosci. 2013 Oct 9;33(41):16072-87.
Plant sterols the better cholesterol in Alzheimer's disease? A mechanistical study.
Burg VK, Grimm HS, Rothhaar TL, Grösgen S, Hundsdörfer B, Haupenthal VJ, Zimmer VC, Mett J, Weingärtner O, Laufs U, Broersen LM, Tanila H, Vanmierlo T, Lütjohann D, Hartmann T, Grimm MO.Abstract
Amyloid-β (Aβ),
major constituent of senile plaques in Alzheimer's disease (AD), is
generated by proteolytic processing of the amyloid precursor protein
(APP) by β- and γ-secretase. Several lipids, especially cholesterol, are
associated with AD. Phytosterols are naturally occurring cholesterol
plant equivalents, recently been shown to cross the blood-brain-barrier
accumulating in brain. Here, we investigated the effect of the most
nutritional prevalent phytosterols and cholesterol on APP processing. In
general, phytosterols are less amyloidogenic than cholesterol. However,
only one phytosterol, stigmasterol, reduced Aβ generation by (1)
directly decreasing β-secretase activity, (2) reducing expression of all
γ-secretase components, (3) reducing cholesterol and presenilin
distribution in lipid rafts implicated in amyloidogenic APP cleavage,
and by (4) decreasing BACE1 internalization to endosomal compartments,
involved in APP β-secretase cleavage. Mice fed with
stigmasterol-enriched diets confirmed protective effects in vivo,
suggesting that dietary intake of phytosterol blends mainly containing
stigmasterol might be beneficial in preventing AD.
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