Impact of Aβ40 and Aβ42 Fibrils on the Transcriptome of Primary Astrocytes and Microglia.
Impact of Aβ40 and Aβ42 Fibrils on the Transcriptome of Primary Astrocytes and Microglia.
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DOI：
10.3390/biomedicines10112982
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发表时间：
2022-11-19
期刊：
影响因子：
4.7
通讯作者：
Van Nostrand, William E.
中科院分区：
文献类型：
--
作者：
Zhu, Xiaoyue;Schrader, Joseph M.;Irizarry, Brandon A.;Smith, Steven O.;Van Nostrand, William E.
Fibrillar amyloid β-protein (Aβ) deposits in the brain, which are primarily composed of Aβ40 or Aβ42 peptides, are key pathological features of Alzheimer’s disease (AD) and related disorders. Although the underlying mechanisms are still not clear, the Aβ fibrils can trigger a number of cellular responses, including activation of astrocytes and microglia. In addition, fibril structures of the Aβ40 and Aβ42 peptides are known to be polymorphic, which poses a challenge for attributing the contribution of different Aβ sequences and structures to brain pathology. Here, we systematically treated primary astrocytes and microglia with single, well-characterized polymorphs of Aβ40 or Aβ42 fibrils, and performed bulk RNA sequencing to assess cell-specific changes in gene expression. A greater number of genes were up-regulated by Aβ42 fibril-treated glial cells (251 and 2133 genes in astrocyte and microglia, respectively) compared with the Aβ40 fibril-treated glial cells (191 and 251 genes in astrocytes and microglia, respectively). Immunolabeling studies in an AD rat model with parenchymal fibrillar Aβ42 plaques confirmed the expression of PAI-1, MMP9, MMP12, CCL2, and C1r in plaque-associated microglia, and iNOS, GBP2, and C3D in plaque-associated astrocytes, validating markers from the RNA sequence data. In order to better understand these Aβ fibril-induced gene changes, we analyzed gene expression patterns using the Ingenuity pathway analysis program. These analyses further highlighted that Aβ42 fibril treatment up-regulated cellular activation pathways and immune response pathways in glial cells, including IL1β and TNFα in astrocytes, and microglial activation and TGFβ1 in microglia. Further analysis revealed that a number of disease-associated microglial (DAM) genes were surprisingly suppressed in Aβ40 fibril treated microglia. Together, the present findings indicate that Aβ42 fibrils generally show similar, but stronger, stimulating activity of glial cells compared with Aβ40 fibril treatment.
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影响因子：
15
作者：
Colvin MT;Silvers R;Frohm B;Su Y;Linse S;Griffin RG
通讯作者：
Griffin RG
DOI：
10.1016/s0006-291x(84)80190-4
发表时间：
1984-01-01
影响因子：
3.1
作者：
GLENNER, GG;WONG, CW
通讯作者：
WONG, CW
影响因子：
13.3
作者：
Cho, Mi-Hyang;Cho, Kwangmin;Yoon, Seung-Yong
通讯作者：
Yoon, Seung-Yong
影响因子：
4.7
作者：
DiSabato DJ;Quan N;Godbout JP
通讯作者：
Godbout JP
影响因子：
11.2
作者：
Arvanitakis, Zoe;Leurgans, Sue E.;Wang, Zhenxin;Wilson, Robert S.;Bennett, David A.;Schneider, Julie A.
通讯作者：
Schneider, Julie A.