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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Acta+Neuropathol+Commun
2015 ; 3
(ä): 70
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Murine versus human apolipoprotein E4: differential facilitation of and
co-localization in cerebral amyloid angiopathy and amyloid plaques in APP
transgenic mouse models
#MMPMID26556230
Liao F
; Zhang TJ
; Jiang H
; Lefton KB
; Robinson GO
; Vassar R
; Sullivan PM
; Holtzman DM
Acta Neuropathol Commun
2015[Nov]; 3
(ä): 70
PMID26556230
show ga
INTRODUCTION: Amyloid ? (A?) accumulates in the extracellular space as diffuse
and neuritic plaques in Alzheimer's disease (AD). A? also deposits on the walls
of arterioles as cerebral amyloid angiopathy (CAA) in most cases of AD and
sometimes independently of AD. Apolipoprotein E (apoE) ?4 is associated with
increases in both A? plaques and CAA in humans. Studies in mouse models that
develop A? deposition have shown that murine apoE and human apoE4 have different
abilities to facilitate plaque or CAA formation when studied independently. To
better understand and compare the effects of murine apoE and human apoE4, we bred
5XFAD (line 7031) transgenic mice so that they expressed one copy of murine apoE
and one copy of human apoE4 under the control of the normal murine apoE
regulatory elements (5XFAD/apoE(m/4)). RESULTS: The 5XFAD/apoE(m/4) mice
contained levels of parenchymal CAA that were intermediate between
5XFAD/apoE(m/m) and 5XFAD/apoE(4/4) mice. In 5XFAD/apoE(m/4) mice, we found that
A? parenchymal plaques co-localized with much more apoE than did parenchymal CAA,
suggesting differential co-aggregation of apoE with A? in plaques versus CAA.
More importantly, within the brain parenchyma of the 5XFAD/apoE(m/4) mice,
plaques contained more murine apoE, which on its own results in more pronounced
and earlier plaque formation, while CAA contained more human apoE4 which on its
own results in more pronounced CAA formation. We further confirmed the
co-aggregation of mouse apoE with A? in plaques by showing a strong correlation
between insoluble mouse apoE and insoluble A? in PS1APP-21/apoE(m/4) mice which
develop plaques without CAA. CONCLUSIONS: These studies suggest that both murine
apoE and human apoE4 facilitate differential opposing effects in influencing A?
plaques versus CAA via different co-aggregation with these two amyloid lesions
and set the stage for understanding these effects at a molecular level.