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Zheng J, Zhang W, Kang P, Zheng X, He K, Bai H, Yu X. Midazolam Ameliorates Impairment of the Blood-Brain Barrier (BBB) Against LPS. Neurotox Res 2022; 40:751-762. [PMID: 35451708 DOI: 10.1007/s12640-022-00508-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/27/2022] [Accepted: 04/09/2022] [Indexed: 10/18/2022]
Abstract
Central nervous system (CNS) dysfunction induced by sepsis and pathogenic microbial infections is reported to be closely associated with increased permeability of the blood-brain barrier (BBB), which is mainly mediated by the stimulation of lipopolysaccharide (LPS) on inflammatory signaling. Midazolam is a novel sedative acting on the benzodiazepine receptor, which is recently reported to exert a neuroprotective effect by inhibiting inflammation. The present study will explore the potential repair capacity of Midazolam on LPS-induced damage to the BBB. The in vivo mice model was established by intraperitoneal injection of LPS, while the in vitro model was constructed by stimulating endothelial cells utilizing LPS. We found that the increased malondialdehyde (MDA) level and reduced superoxide dismutase (SOD) activity in the brain cortices, promoted serum concentration of inflammatory factors, and elevated BBB permeability were found in the LPS group, all of which were dramatically reversed by 1 mg/kg and 2 mg/kg Midazolam. Interestingly, Midazolam increased the expression of the tight junction protein zonula occludens-1 (ZO-1). In LPS-challenged in vitro human brain microvascular endothelial cells (HBMECs), the increased concentration of inflammatory factors, reduced trans-endothelial electrical resistance (TEER) level, elevated relative value of trans-endothelial permeability, and downregulated ZO-1 were observed, all of which were pronouncedly alleviated by Midazolam, accompanied by the inhibition on the Ras homolog family member A/ Rho-kinase 2 (RhoA/ROCK-2) pathway. Furthermore, the regulatory effects of Midazolam on ZO-1 expression and the endothelial monolayer permeability in LPS-challenged HBMECs were abolished by the overexpression of RhoA. Collectively, our data imply that Midazolam ameliorated the impairment of the BBB against LPS by regulating the RhoA/ROCK2 pathway.
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Affiliation(s)
- Juyan Zheng
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 1 Shuaifuyuan, Wangfujing, Dongcheng District, Beijing, 100730, China
| | - Wei Zhang
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Bejing, 100730, China
| | - PeiPei Kang
- Department of Anesthesiology, Affiliated Tumor Hospital of Nantong University, Nantong, 226006, China
| | - Xiaojiao Zheng
- Department of Blood Transfusion, The First Affiliated Hospital of Baotou Medical College, Baotou, 014017, China
| | - Kai He
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 1 Shuaifuyuan, Wangfujing, Dongcheng District, Beijing, 100730, China
| | - Hong Bai
- Department of Anesthesiology, Wuhai People's Hospital, Wuhai, 016099, China
| | - Xuerong Yu
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 1 Shuaifuyuan, Wangfujing, Dongcheng District, Beijing, 100730, China.
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Neuronal Transmembrane Chloride Transport Has a Time-Dependent Influence on Survival of Hippocampal Cultures to Oxygen-Glucose Deprivation. Brain Sci 2019; 9:brainsci9120360. [PMID: 31817665 PMCID: PMC6955658 DOI: 10.3390/brainsci9120360] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 12/02/2019] [Accepted: 12/05/2019] [Indexed: 12/16/2022] Open
Abstract
Neuronal ischemia results in chloride gradient alterations which impact the excitatory–inhibitory balance, volume regulation, and neuronal survival. Thus, the Na+/K+/Cl− co-transporter (NKCC1), the K+/ Cl− co-transporter (KCC2), and the gamma-aminobutyric acid A (GABAA) receptor may represent therapeutic targets in stroke, but a time-dependent effect on neuronal viability could influence the outcome. We, therefore, successively blocked NKCC1, KCC2, and GABAA (with bumetanide, DIOA, and gabazine, respectively) or activated GABAA (with isoguvacine) either during or after oxygen-glucose deprivation (OGD). Primary hippocampal cultures were exposed to a 2-h OGD or sham normoxia treatment, and viability was determined using the resazurin assay. Neuronal viability was significantly reduced after OGD, and was further decreased by DIOA treatment applied during OGD (p < 0.01) and by gabazine applied after OGD (p < 0.05). Bumetanide treatment during OGD increased viability (p < 0.05), while isoguvacine applied either during or after OGD did not influence viability. Our data suggests that NKCC1 and KCC2 function has an important impact on neuronal viability during the acute ischemic episode, while the GABAA receptor plays a role during the subsequent recovery period. These findings suggest that pharmacological modulation of transmembrane chloride transport could be a promising approach during stroke and highlight the importance of the timing of treatment application in relation to ischemia-reoxygenation.
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