: Cerebral ischemia is one of the major preoperative complications. Dexmedetomidine is a well-known sedative-hypnotic agent that has potential organ-protective effects. We examine the miRNAs associated with preconditioning effects of dexmedetomidine in cerebral ischemia. : Transient infarcts were induced in mice via reperfusion after temporary occlusion of one side of the middle cerebral artery. A subset of these mice was exposed to dexmedetomidine prior to cerebral infarction and miRNA profiling of the whole brain was performed. We administered dexmedetomidine and miRNA-323-5p mimic/inhibitor to oxygen-glucose deprivation/reoxygenation astrocytes. Additionally, we administered miR-323-5p mimic and inhibitor to mice via intracerebroventricular injection 2 h prior to induction of middle cerebral artery occlusion. : The infarct volume was significantly lower in the dexmedetomidine-preconditioned mice. Analysis of brain samples revealed an increased expression of five miRNAs and decreased expression of three miRNAs in the dexmedetomidine-pretreated group. The viability of cells significantly increased and expression of miR-323-5p was attenuated in the dexmedetomidine-treated oxygen-glucose deprivation/reoxygenation groups. Transfection with anti-miR-323-5p contributed to increased astrocyte viability. When miRNA-323-5p was injected intraventricularly, infarct volume was significantly reduced when preconditioned with the miR-323-5p inhibitor compared with mimic and negative control. : Dexmedetomidine has a protective effect against transient neuronal ischemia-reperfusion injury and eight specific miRNAs were profiled. Also, miRNA-323-5p downregulation has a cell protective effect under ischemic conditions both in vivo and in vitro. Our findings suggest the potential of the miR-323-5p inhibitor as a therapeutic agent against cerebral infarction.
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http://dx.doi.org/10.3390/medicina59091518 | DOI Listing |
Acta Neuropathol Commun
December 2024
Institute of Physiology and Pathophysiology, Department of Cardiovascular Physiology, Heidelberg University, Heidelberg, Germany.
Severity and outcome of strokes following cerebral hypoperfusion are significantly influenced by stress responses of the blood vessels. In this context, brain endothelial cells (BEC) regulate inflammation, angiogenesis and the vascular resistance to rapidly restore perfusion. Despite the relevance of these responses for infarct volume and tissue recovery, their transcriptional control in BEC is not well characterized.
View Article and Find Full Text PDFHum Exp Toxicol
December 2024
Department of neurology, Hubei Provincial Hospital of Traditional Chinese Medicine, Wuhan, China. Hubei Sizhen Laboratory, Affiliated Hospital of Hubei University of Chinese Medicine, Wuhan, China.
Introduction: The incidence of cerebral ischemia-reperfusion injury (I/R) is complex which seriously threatens the life safety of patients. Neither its prevention nor its treatment has been successful so far. Proteins that bind to DNA and belong to the C2/H2 zinc finger family are known as Krüppel-like factors (KLFs).
View Article and Find Full Text PDFZhonghua Yu Fang Yi Xue Za Zhi
December 2024
Children's Hospital Affiliated to Capital Institute of Pediatrics, Beijing100020, China.
This study aimed to analyze the clinical characteristics and prognosis of Takayasu's arteritis (TA) with carotid artery occlusion in children. This study collected clinical data and follow-up information on the first diagnosis and treatment of c-TA combined with carotid artery occlusion in pediatric patients at the Children's Hospital affiliated with the Capital Institute of Pediatrics and Inner Mongolia Medical University Affiliated Hospital from 2013 to 2023. This study included four female patients with a mean age of (13.
View Article and Find Full Text PDFExp Neurol
December 2024
Department of Encephalopathy, Shenzhen Luohu Hospital of Traditional Chinese Medicine, Shenzhen, Guangdong 518000, China; Department of Encephalopathy, Shenzhen Hospital of Shanghai University of Traditional Chinese Medicine, Shenzhen, Guangdong 518000, China. Electronic address:
Ischaemic stroke is one of the major diseases affecting human health, involving complex and diverse pathological mechanisms, including inflammatory response, oxidative stress and angiogenesis. Sodium ferulate (SF) exerts a protective effect on cerebral ischaemia/reperfusion and when combined with bone marrow mesenchymal stem cells (BMSCs), has a considerable therapeutic effect on brain injury in rats. Here, we speculate that SF also exerts cerebroprotective effects.
View Article and Find Full Text PDFExp Neurol
December 2024
Department of Neurology, Brain Research Institute, Niigata University, 1-757 Asahimachi-dori, Chuoku, Niigata 951-8585, Japan. Electronic address:
Background: Despite advances in reperfusion therapies, ischemic stroke remains a major cause of long-term disability due to residual hypoxic lesions persisting after macrovascular reperfusion. These residual hypoxic lesions, caused by microvascular dysfunction, represent an important therapeutic target. We previously demonstrated that oxygen-glucose-deprived peripheral blood mononuclear cells (OGD-PBMCs) migrate to ischemic brain regions and promote functional recovery after stroke.
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