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Effect of depletion of Matn3 on gene expression in mouse cerebral cortex after ischemia stroke

ABSTRACT: The role of matrilin-3 in the brain, an extracellular matrix component in cartilage, is unknown. Here, we identify matrilin-3 decreased in reactive astrocytes but unchanged in neurons after ischemic stroke in animals. Importantly, it is declined in serum of patients with acute ischemic stroke. Genetic or pharmacological inhibition or supplementation of matrilin-3 aggravates or reduces brain injury, astrocytic cell death and glial scar, respectively, but has no direct effect on neuronal cell death. RNA-sequencing demonstrates that Matn3−/− mice display an increased inflammatory response profile in the ischemic brain, including the NF-κB signaling pathway. Both endogenous and exogenous matrilin-3 reduce inflammatory mediators. Mechanistically, extracellular matrilin-3 enters astrocytes via caveolin-1-mediated endocytosis. Cytoplasmic matrilin-3 translocates into the nucleus by binding to NF-κB p65, suppressing inflammatory cytokines transcription. Extracellular matrilin-3 binds to BMP-2, blocking BMP-2/Smads pathway. Thus, matrilin-3 is required for astrocytes to exert neuroprotection at least partially via suppressing astrocyte-mediated neuroinflammation.

ORGANISM(S): Mus musculus

PROVIDER: GSE253799 | GEO | 2024/02/22

REPOSITORIES: GEO

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Project description:Local cerebral hypoperfusion causes ischemic stroke while driving multiple cell-specific responses including inflammation, glutamate-NMDAR-mediated neurotoxicity, edema formation and angiogenesis. Despite the relevance of these pathophysiological mechanisms for disease progression and outcome, molecular determinants controlling the onset of these processes are only partially understood. In this context, our study intended to investigate the functional role of EphB2 – a receptor tyrosine kinase that is crucial for synapse function and binds to membrane-associated ephrin-B ligands. Cerebral ischemia was induced in EphB2-deficient mice by transient middle cerebral artery occlusion followed by different times (6, 12, 24 and 48 h) of reperfusion. Histological, neurofunctional and transcriptome analyses indicated an increase in EphB2 phosphorylation under these conditions and attenuated progression of stroke in EphB2-deficient mice. Moreover, while infiltration of microglia/macrophages and astrocytes into the peri-infarct region was not altered, expression of the pro-inflammatory mediators MCP-1 or IL-6 was decreased in these mice. In fact, in vitro analyses indicated that binding of EphB2 to astrocytic ephrin-B ligands stimulates NF-κB-mediated cytokine expression via the MAPK pathway. Further magnetic resonance imaging of the EphB2-deficient ischemic brain revealed a lower level of neuronal cytotoxic edema formation within 6 h upon onset of reperfusion. On the mechanistic level, absence of neuronal EphB2 decreased the mitochondrial Ca2+ load upon activation of NMDAR but not AMPAR. Moreover, activation of EphB2 by ephrin-B2 enhanced the NMDA-evoked excitotoxic neuronal cell death in vitro while neuron-specific loss of ephrin-B2 reduced the extent of cerebral tissue damage in the acute phase of ischemic stroke. Collectively, EphB2 may promote the immediate response to an ischemia-reperfusion event in the central nervous system by (i) pro-inflammatory activation of astrocytes via ephrin-B-dependent signalling and (ii) amplification of the NMDA-evoked neuronal excitotoxicity.

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Effect of depletion of Matn3 on gene expression in mouse cerebral cortex after ischemia stroke

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