Higher-ordered oligomeric α-synuclein induces complex morphofunctional activation of microglia. Higher-ordered oligomeric α-synuclein induces complex morphofunctional.

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Higher-ordered oligomeric α-synuclein induces complex morphofunctional activation of microglia. Higher-ordered oligomeric α-synuclein induces complex morphofunctional activation of microglia. (A) Representative Western blot analysis of misfolded human α-synuclein under nondenaturing conditions. Purified recombinant α-synuclein was misfolded (SynTR) and subsequently separated to isolate higher-ordered oligomeric conformers (SynO; bracket) from the monomeric and dimeric structures (SynM; arrowhead). (B) Representative transmission electron microscopy of SynO and SynM at ×75,000 magnification. Fibrils are present in the SynO fraction (black arrows). Scale bars, 100 nm. (C) Immunohistochemistry for Iba-1 in microglia after a 24-hour exposure to SynM or SynO (80.0 ng/ml). DAPI, 4′,6-diamidino-2-phenylindole. Scale bars, 20 μm. (D) Quantitative real-time polymerase chain reaction (qRT-PCR) for TNF-α and IL-1β expression in microglia after exposure to SynM or SynO (80.0 ng/ml). (E) Enzyme-linked immunosorbent assay (ELISA) for the concentrations of TNF-α and IL-1β in the conditioned medium from microglia cultured for 2 and 24 hours with SynO or SynM (80.0 ng/ml). (F) qRT-PCR analysis for ARG-1 (arginase 1) and IL-10 gene expression in microglia cultured with SynO or SynM (0.95 μg/ml) for 24 hours. Black dashed line, gene expression in vehicle control. (G) ELISA for the concentration of IL-10 in the supernatant of microglia cultured with either SynM or SynO (80 ng/ml) for 2 and 24 hours. All data are means ± SEM (n = 3 experiments). *P = 0.01, ***P < 0.0001. In (E), $$$P < 0.0001, comparing 2- and 24-hour SynO data. Data were analyzed by unpaired Student’s t test (D) or one-way analysis of variance (ANOVA) with Bonferroni post hoc test (E to G). N.D., not detectable. Stefano G. Daniele et al., Sci. Signal. 2015;8:ra45 Copyright © 2015, American Association for the Advancement of Science