Abstract
Ischemic stroke is one of the leading causes of death worldwide. In the post-stroke stage, cardiac dysfunction is common and is known as the brain–heart interaction. Diabetes mellitus worsens the post-stroke outcome. Stroke-induced systemic inflammation is the major causative factor for the sequential complications, but the mechanism underlying the brain–heart interaction in diabetes has not been clarified. The NLRP3 (NLR pyrin domain-containing 3) inflammasome, an important component of the inflammation after stroke, is mainly activated in M1-polarized macrophages. In this study, we found that the cardiac dysfunction induced by ischemic stroke is more severe in a mouse model of type 2 diabetes. Meanwhile, M1-polarized macrophage infiltration and NLRP3 inflammasome activation increased in the cardiac ventricle after diabetic stroke. Importantly, the NLRP3 inflammasome inhibitor CY-09 restored cardiac function, indicating that the M1-polarized macrophage–NLRP3 inflammasome activation is a pathway underlying the brain–heart interaction after diabetic stroke.
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This work was supported by grants from the National Natural Science Foundation of China (81771232 and 81974192) and the Natural Science Foundation of Guangdong Province, China (2019A1515010654).
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Lin, HB., Wei, GS., Li, FX. et al. Macrophage–NLRP3 Inflammasome Activation Exacerbates Cardiac Dysfunction after Ischemic Stroke in a Mouse Model of Diabetes. Neurosci. Bull. 36, 1035–1045 (2020). https://doi.org/10.1007/s12264-020-00544-0
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DOI: https://doi.org/10.1007/s12264-020-00544-0