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Tissue-Specific Immune Transcriptional Signatures in the Bordering Tissues of the Mouse Retina and Brain. | LitMetric
Purpose : Bordering the central nervous system (CNS) parenchyma are the choroid (underlying the retina) and the leptomeninges (the inner layers of the meninges enveloping the brain). Although near the neural parenchyma, the choroid and leptomeninges are external to the immune privileged environment of the retina and brain and thus are distinct immune compartments. This study aimed to characterize the transcriptomic signatures of immune cells within the choroid and leptomeninges bordering the healthy adult mouse CNS.Methods : Eyes and brains were obtained from 7-week-old C57Bl/6J mice. Choroid and leptomeninges were processed for isolation of CD45+ immune cells and single cell RNA-sequencing. Additionally, single cell RNA-sequencing was performed on immune cells isolated from choroid obtained from human donor eye tissue. Immunostaining and confocal microscopy of wholemount tissue were used to validate selected immune cell populations in situ.Results : A total of 3606 cells were sequenced from mouse tissues, including 2125 CD45+ cells from choroid and 1481 CD45+ cells from leptomeninges. Clustering and differential gene expression analysis revealed heterogeneous subtypes of monocytes/macrophages, dendritic cells, T cells, and B cells. Whereas some clusters were common to both choroid and leptomeninges, others exhibited tissue-specific gene expression profiles and potential functional specializations. Analysis of 6501 CD45+ cells sequenced from human choroid identified similar immune cell populations to mouse choroid.Conclusions : This study provides a detailed characterization of the molecular signatures of immune cells within the vascular connective tissues bordering the healthy retina and brain, and their potential roles in immune protection.
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