IFN-gamma promotes complement expression and attenuates amyloid plaque deposition in amyloid beta precursor protein transgenic mice.
IFN-gamma promotes complement expression and attenuates amyloid plaque deposition in amyloid beta precursor protein transgenic mice.
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DOI:
10.4049/jimmunol.0903382
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发表时间:
2010-05-01
期刊:
影响因子:
--
通讯作者:
Das P
中科院分区:
文献类型:
--
作者:
Chakrabarty P;Ceballos-Diaz C;Beccard A;Janus C;Dickson D;Golde TE;Das P
Reactive gliosis surrounding amyloid β (Aβ) plaques is an early feature of Alzheimer’s disease (AD) pathogenesis and may signify activation of the innate immune system in an attempt to clear or neutralize Aβ aggregates. In order to evaluate the role of IFNγ mediated neuroinflammation on the evolution of Aβ pathology in transgenic mice, we have expressed murine IFNγ (mIFNγ) in the brains of amyloid β precursor protein (APP) transgenic mice using recombinant adeno-associated virus serotype 1. Expression of mIFNγ in brains of APP TgCRND8 mice results in robust non-cell autonomous activation of microglia and astrocytes, and significant suppression of Aβ deposition. mIFNγ expression had no significant effects on APP levels, APP processing or steady state Aβ levels in vivo. On the other hand, mIFNγ expression upregulated MHCII and CD11c levels and early components of the complement cascade in vivo. Taken together, these results suggest that mIFNγ expression in the brain suppresses Aβ accumulation through synergistic effects of reactive gliosis and complement activation by promoting opsonization and phagocytosis of Aβ aggregates.
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