Journal: Cell reports
Article Title: Astrocytic Slc4a4 regulates blood-brain barrier integrity in healthy and stroke brains via a CCL2-CCR2 pathway and NO dysregulation
doi: 10.1016/j.celrep.2024.114193
Figure Lengend Snippet: (A) Conditioned medium (CM) was collected from primary WT and Slc4a4 KO astrocytes and subjected to LC-MS/MS-based unbiased proteomics and cytokine/chemokine array. (B) Angiogenic factors detected from LC-MS/MS-based unbiased proteomics. (C) Cytokine/chemokines changed in the CM from WT and Slc4a4 KO astrocytes. Pooled CM from three independent cultures per genotype were used (D) CCL2 level was measured by ELISA in CM collected under either normal or oxygen-glucose-deprivation (OGD) condition cortices from uninjured and stroked (1 dpi) brains from WT and Slc4a4-icKO mice. Each dot represents CM or cortices collected from an individual animal. n = 3–5 per genotype. * p < 0.05, ** p < 0.01 by Student’s t test. In vivo astrocytic CCL2 expression after stroke at 4 dpi was quantified from double immunostaining. n = 17–21 cells collected from 3–5 mice per genotype. * p < 0.05 by Student’s t test. (E) Representative images of astrocytic CCL2 expression at 4 dpi by double immunostaining of CCL2/GFAP. (F and G) Endothelial CCR2 mRNA expression was visualized by RNA scope and CD31 staining and quantified by counts of CCR2+ puncta. Each dot represents an individual blood vessel. n = 49 vessels collected from 4 mice per genotype. **** p < 0.0001 by Student’s t test. (H and I) Representative images and quantification of endothelial CCR2 expression from double immunostaining. Each dot represents an individual animal. n = 4–5 per genotype. * p < 0.05 by Student’s t test. (J) Proposed model for the Slc4a4-CCL2-CCR2 axis regulating astrocyte-endothelial interaction. All data are presented as mean ± SEM.
Article Snippet: CCR2 antagonist , Tocris , 2517/10.
Techniques: Liquid Chromatography with Mass Spectroscopy, Enzyme-linked Immunosorbent Assay, In Vivo, Expressing, Double Immunostaining, RNAscope, Staining