Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Single-Cell RNA Sequencing of Brain Endothelial Cells in 12-Month-Old Male 5XFAD and Wild-Type Mice

ABSTRACT: This study investigates Alzheimer's Disease-related transcriptomic changes in brain endothelial cells of 5XFAD mice on the C57BL/6J background using single-cell RNA sequencing. Brains from male hemizygous 5XFAD (n=3) and wild-type control mice (n=3) aged 12 months were used. Brain tissue (excluding olfactory bulbs and cerebellum) was dissociated into a single cell suspension, and Fluorescence Activated Cell Sorting (FACS) was used to isolate CD31+, CD45- cells. Cells were encapsulated and sequenced using the 10x Genomics platform. Libraries were sequenced on an Illumina NovaSeq XP, targeting ~50,000 reads per cell. In our analysis, raw data were aligned to the mouse (GRCm39)-2024-A reference genome. FASTQs are named: 13389-RE-1 (Wild-type 1), 13389-RE-2 (Wild-type 2), 13389-RE-3 (Wild-type 3), 13389-RE-4 (5XFAD 1), 13389-RE-5 (5XFAD 2), 13389-RE-6 (5XFAD 3).

INSTRUMENT(S): 5-Laser BD FACSAria III, Illumina NovaSeq X, None, 10X Genomics Chromium

ORGANISM(S): Mus musculus

SUBMITTER: Rebecca Embalabala

PROVIDER: E-MTAB-16239 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Microglia are innate immune cells of the brain that perform phagocytic and inflammatory functions in disease conditions. Transcriptomic studies of acutely-isolated microglia have provided novel insights into their molecular and functional diversity in homeostatic and neurodegenerative disease states. State-of-the-art mass spectrometric methods can comprehensively characterize proteomic alterations in microglia in neurodegenerative disorders, potentially providing novel functionally-relevant molecular insights that are not provided by transcriptomics. However, proteomic profiling of adult primary microglia in neurodegenerative disease conditions has not been performed. We performed quantitative proteomic analyses of purified CD11b+ acutely-isolated microglia adult mice in normal, acute neuroinflammatory (LPS-treatment) and chronic neurodegenerative states (5xFAD model of Alzheimer’s disease [AD]) using tandem mass tag mass spectrometry. Differential expression analyses were performed to characterize specific microglial proteomic changes in 5xFAD mice and identify overlap with LPS-induced pro-inflammatory changes. Our results were also contrasted with existing proteomic data from wild-type mouse microglia and from existing microglial transcriptomic data from wild-type and 5xFAD mice. Neuropathological validation studies of select proteins were performed in human AD and 5xFAD brains. Of 4,133 proteins identified, 187 microglial proteins were differentially expressed in the 5xFAD mouse model of AD pathology, including proteins with previously known (Apoe, Clu and Htra1) as well as previously unreported relevance to AD biology (Cotl1 and Hexb). Proteins upregulated in 5xFAD microglia shared significant overlap with pro-inflammatory changes observed in LPS-treated mice. Several proteins increased in human AD brain were also upregulated by 5xFAD microglia (Aβ peptide, Apoe, Htra1, Cotl1 and Clu). Cotl1 was identified as a novel microglia-specific marker with increased expression and strong association with AD neuropathology. Apoe protein was also detected within plaque-associated microglia in which Apoe and Aβ were highly co-localized suggesting a role for Apoe in phagocytic clearance of Aβ. We report the first comprehensive comparative proteomic study of adult mouse microglia derived from acute neuroinflammatory and AD models, representing a valuable resource to the neuroscience research community. We highlight shared and unique microglial proteomic changes in acute neuroinflammatory, aging and AD mouse models in addition to identifying novel roles for microglial proteins in human neurodegeneration.

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Single-Cell RNA Sequencing of Brain Endothelial Cells in 12-Month-Old Male 5XFAD and Wild-Type Mice

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