scholarly journals Design, Synthesis and Biological Evaluation of Indoline Derivatives as Multifunctional Agents for the Treatment of Ischemic Stroke

2021 ◽  
Author(s):  
Shuaishuai Du ◽  
Fan Jin ◽  
Jiaming Li ◽  
Xiaodong Ma ◽  
Hongwei Wang ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Neuronal Damage ◽  
Glucose Deprivation ◽  
Biological Evaluation ◽  
Artery Occlusion ◽  
Raw 264.7 Cells ◽  
Protective Effects ◽  
Neuroprotective Agents ◽  
Neuroprotective Effects ◽  
Design Synthesis

Abstract In this work, a series of indoline derivatives as multifunctional neuroprotective agents for battling ischemic stroke were designed, synthesized, and biologically evaluated. In antioxidant assay, all compounds showed significant protective effects against H2O2-induced death of RAW 264.7 cells. In oxygen glucose deprivation/reperfusion (OGD/R)-induced neuronal damage, some compounds significantly elevated the cell survival rate. Among them, 7i, 7j and 7r exerted comparable neuroprotective effects to Ifenprodil, and exhibited binding affinity to N-methyl-D-aspartic acid receptors 2B (NMDA-GluN2B). At the concentrations of 0.1, 1 and 10 μM, 7i, 7j and 7r dose-dependently lowered the LPS-induced secretion of inflammatory cytokines, including TNF-α, IL-6 and NO, by BV-2 cells. Importantly, 7i and 7j can dramatically reduce the cerebral infarction rate and improve neurological deficit scores in middle cerebral artery occlusion (MCAO) rat model. As demonstrated by the above results, 7i and 7j are potential neuroprotective agents for the treatment of ischemic stroke.

Design, Synthesis, and Biological Evaluation of Novel Tetramethylpyrazine- nitrone Derivatives as antioxidants

2020 ◽  
Vol 17 ◽  
Author(s):  
Haiyun Chen ◽  
Chunyan Yan ◽  
Jie Cao ◽  
Zheng Liu ◽  
Yewei Sun ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Neurite Outgrowth ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Iodoacetic Acid ◽  
Biological Evaluation ◽  
Protective Effects ◽  
Neuroprotective Effects ◽  
Design Synthesis

Background: Thrombolysis and endovascular thrombectomy acted as two mainly therapeutic strategies for the ischemic stroke in clinic. However, reperfusion injury caused oxidative stress leading overproduction of reactive oxygen species, mitochondrial dysfunction and subsequent cell death. Methods: We designed and synthesized two tetramethylpyrazine-nitrone derivatives (T-003 and T-005) and investigated their abilities for scavenging free radicals and protective effects as well as neurite outgrowth promotion in vitro. Results and Discussion: Both of them showed potent radical-scavenging activity and neuroprotective effects against iodoacetic acid-induced cells injury. Furthermore, T-003 and T-005 significantly promoted neurite outgrowth in PC12 cells. Conclusion: Our results suggest that compound T-003 and T-005 could be potent antioxidants for the treatment of neurological disease, particularly ischemic stroke.

scholarly journals Neuroprotective effects of adenosine deaminase in the striatum

2016 ◽  
Vol 36 (4) ◽  
pp. 709-720 ◽  
Author(s):  
Risa Tamura ◽  
Hiroyuki Ohta ◽  
Yasushi Satoh ◽  
Shigeaki Nonoyama ◽  
Yasuhiro Nishida ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Adenosine Deaminase ◽  
Neuronal Damage ◽  
Brain Slices ◽  
Field Potential ◽  
Glucose Deprivation ◽  
Oxygen Glucose Deprivation ◽  
Protective Effects ◽  
Neuroprotective Effects ◽  
Negative Effect

Adenosine deaminase (ADA) is a ubiquitous enzyme that catabolizes adenosine and deoxyadenosine. During cerebral ischemia, extracellular adenosine levels increase acutely and adenosine deaminase catabolizes the increased levels of adenosine. Since adenosine is a known neuroprotective agent, adenosine deaminase was thought to have a negative effect during ischemia. In this study, however, we demonstrate that adenosine deaminase has substantial neuroprotective effects in the striatum, which is especially vulnerable during cerebral ischemia. We used temporary oxygen/glucose deprivation (OGD) to simulate ischemia in rat corticostriatal brain slices. We used field potentials as the primary measure of neuronal damage. For stable and efficient electrophysiological assessment, we used transgenic rats expressing channelrhodopsin-2, which depolarizes neurons in response to blue light. Time courses of electrically evoked striatal field potential (eFP) and optogenetically evoked striatal field potential (optFP) were recorded during and after oxygen/glucose deprivation. The levels of both eFP and optFP decreased after 10 min of oxygen/glucose deprivation. Bath-application of 10 µg/ml adenosine deaminase during oxygen/glucose deprivation significantly attenuated the oxygen/glucose deprivation-induced reduction in levels of eFP and optFP. The number of injured cells decreased significantly, and western blot analysis indicated a significant decrease of autophagic signaling in the adenosine deaminase-treated oxygen/glucose deprivation slices. These results indicate that adenosine deaminase has protective effects in the striatum.

scholarly journals Ras-like Gem GTPase induced by Npas4 promotes activity-dependent neuronal tolerance for ischemic stroke

2021 ◽  
Vol 118 (32) ◽  
pp. e2018850118
Author(s):  
Hiroo Takahashi ◽  
Ryo Asahina ◽  
Masayuki Fujioka ◽  
Takeshi K. Matsui ◽  
Shigeki Kato ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Cortical Neurons ◽  
Glucose Deprivation ◽  
Artery Occlusion ◽  
Small Gtpase ◽  
Neuroprotective Effects ◽  
Necessary And Sufficient ◽  
Activity Dependent

Ischemic stroke, which results in loss of neurological function, initiates a complex cascade of pathological events in the brain, largely driven by excitotoxic Ca2+ influx in neurons. This leads to cortical spreading depolarization, which induces expression of genes involved in both neuronal death and survival; yet, the functions of these genes remain poorly understood. Here, we profiled gene expression changes that are common to ischemia (modeled by middle cerebral artery occlusion [MCAO]) and to experience-dependent activation (modeled by exposure to an enriched environment [EE]), which also induces Ca2+ transients that trigger transcriptional programs. We found that the activity-dependent transcription factor Npas4 was up-regulated under MCAO and EE conditions and that transient activation of cortical neurons in the healthy brain by the EE decreased cell death after stroke. Furthermore, both MCAO in vivo and oxygen-glucose deprivation in vitro revealed that Npas4 is necessary and sufficient for neuroprotection. We also found that this protection involves the inhibition of L-type voltage-gated Ca2+ channels (VGCCs). Next, our systematic search for Npas4-downstream genes identified Gem, which encodes a Ras-related small GTPase that mediates neuroprotective effects of Npas4. Gem suppresses the membrane localization of L-type VGCCs to inhibit excess Ca2+ influx, thereby protecting neurons from excitotoxic death after in vitro and in vivo ischemia. Collectively, our findings indicate that Gem expression via Npas4 is necessary and sufficient to promote neuroprotection in the injured brain. Importantly, Gem is also induced in human cerebral organoids cultured under an ischemic condition, revealing Gem as a new target for drug discovery.

Neuroprotective Effects of microRNA-140-5p on Ischemic Stroke in Mice via its Regulation on the TLR4/NF-κB Axis

2020 ◽  
Author(s):  
Song Wenjun ◽  
Tiancheng Wang ◽  
Bei Shi ◽  
Zhijun Wu ◽  
Wenjie Wang ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Glucose Deprivation ◽  
Artery Occlusion ◽  
Luciferase Reporter ◽  
Tunel Staining ◽  
Related Factors ◽  
Neuroprotective Effects ◽  
High Level

Abstract Background and aim: Ischemic stroke is one of the main causes of death worldwide and permanent global disability. On the basis of existing literature data, we carried out studies in an effort to explore how miR-140-5p affects ischemic stroke and whether the mechanism relates to toll-like receptor-4 (TLR4) and nuclear factor-kappa B (NF-κB).Methods: Middle cerebral artery occlusion (MCAO) was employed to establish a mouse model of ischemic stroke in vivo, while primary neurons were exposed to oxygen-glucose deprivation (OGD) to set up an ischemic stroke model in vitro. RT-qPCR was performed to detect the miR-140-5p expression and Western blot was employed to detect the expression TLR4, NF-κB, and apoptosis-related factors. Then, based gain-function of experiments using miR-140-5p mimic and TLR4 overexpression plasmid, neurological function score, TTC staining, TUNEL staining, as well as flow cytometry were carried out to evaluate the effects of miR-140-5p and TLR4 on MCAO mice and OGD neurons. Meanwhile, dual-luciferase reporter assay was used to validate the relationship between miR-140-5p and TLR4.Results: miR-140-5p expressed at a low level and TLR4 at a high level in ischemic stroke. It was verified that miR-140-5p targeted TLR4 and downregulated its expression. miR-140-5p overexpression was observed to inhibit the apoptosis of neurons under OGD exposure and restrain the progression of ischemic stroke, while TLR4 overexpression promoted the apoptosis and disease progression. Besides, miR-140-5p overexpression led to a decrease in NF-κB protein level, which was increased by TLR4 overexpression. Conclusion: In conclusion, from our data we conclude that miR-140-5p overexpression may be instrumental for the therapeutic targeting of ischemic stroke by alleviating neuron injury with the involvement of TLR4/NF-κB axis.

Agonistic analog of growth hormone–releasing hormone promotes neurofunctional recovery and neural regeneration in ischemic stroke

2021 ◽  
Vol 118 (47) ◽  
pp. e2109600118
Author(s):  
Yueyang Liu ◽  
Jingyu Yang ◽  
Xiaohang Che ◽  
Jianhua Huang ◽  
Xianyang Zhang ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Ischemic Stroke ◽  
Glucose Deprivation ◽  
Artery Occlusion ◽  
Term Treatment ◽  
Neural Regeneration ◽  
Growth Hormone Releasing Hormone ◽  
Neuroprotective Effects ◽  
Releasing Hormone ◽  
Long Term Treatment

Ischemic stroke can induce neurogenesis. However, most stroke-generated newborn neurons cannot survive. It has been shown that MR-409, a potent synthetic agonistic analog of growth hormone–releasing hormone (GHRH), can protect against some life-threatening pathological conditions by promoting cell proliferation and survival. The present study shows that long-term treatment with MR-409 (5 or 10 μg/mouse/d) by subcutaneous (s.c.) injection significantly reduces the mortality, ischemic insult, and hippocampal atrophy, and improves neurological functional recovery in mice operated on for transient middle cerebral artery occlusion (tMCAO). Besides, MR-409 can stimulate endogenous neurogenesis and improve the tMCAO-induced loss of neuroplasticity. MR-409 also enhances the proliferation and inhibits apoptosis of neural stem cells treated with oxygen and glucose deprivation–reperfusion. The neuroprotective effects of MR-409 are closely related to the activation of AKT/CREB and BDNF/TrkB pathways. In conclusion, the present study demonstrates that GHRH agonist MR-409 has remarkable neuroprotective effects through enhancing endogenous neurogenesis in cerebral ischemic mice.

scholarly journals Upregulation of CREB1 and FOXO1 transcription factor pathways in Neuregulin-1 mediated neuroprotection following ischemic stroke

2021 ◽  
Author(s):  
Kimberly R. Bennett ◽  
Monique C. Surles-Zeigler ◽  
Cathrerine J. Augello ◽  
Etchi Ako ◽  
Victor G.J. Rodgers ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Ischemic Stroke ◽  
Stress Responses ◽  
Molecular Mechanisms ◽  
Neuronal Damage ◽  
Expression Profiles ◽  
Gene Expression Profiles ◽  
Artery Occlusion ◽  
Neuroprotective Effects ◽  
Neuregulin 1

Neuregulin-1 (NRG-1) is growth factor that has been investigated for its neuroprotective properties following ischemic stroke. While NRG-1 has shown significant promise in preventing neuronal damage following stroke, the mechanisms behind its neuroprotective effects are unclear. The goal of this research was to investigate the effects of NRG-1 treatment on ischemia-induced gene expression profiles following a permanent middle cerebral artery occlusion (MCAO) in rats. Rats were sacrificed twelve hours following MCAO and either vehicle or NRG-1 treatment. RNA extracted from the peri-infarct cortex of the brain was hybridized to an Affymetrix Rat Genome 2.0st Microarray Gene Chip. Data were analyzed using the Affymetrix Transcriptome Analysis Console (TAC) 4.0 software and the STRING Protein-Protein Interaction Networks database.  Our results showed that NRG?1 delivery increased the regulation of pro-survival genes. Most notably, NRG-1 treatment upregulated the CREB1 and FOXO1 transcription factor pathways which are involved in increasing anti-inflammatory and cell proliferation responses and decreasing apoptosis and oxidative stress responses, respectively. Luminex multiplex transcription factor assays demonstrated that the activities of CREB1 and FOXO1 were increased by NRG-1 treatment with MCAO. These findings provide novel insight into the molecular mechanisms involved in NRG-1 mediated neuroprotection.

scholarly journals The Key Regulator of Necroptosis, RIP1 Kinase, Contributes to the Formation of Astrogliosis and Glial Scar in Ischemic Stroke

2021 ◽  
Author(s):  
Yong-Ming Zhu ◽  
Liang Lin ◽  
Chao Wei ◽  
Yi Guo ◽  
Yuan Qin ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Glucose Deprivation ◽  
Artery Occlusion ◽  
Glial Scar ◽  
Scar Formation ◽  
Reactive Astrocytes ◽  
Interacting Protein ◽  
Protein Levels ◽  
Endothelial Growth Factor ◽  
Cerebral Artery Occlusion

AbstractNecroptosis initiation relies on the receptor-interacting protein 1 kinase (RIP1K). We recently reported that genetic and pharmacological inhibition of RIP1K produces protection against ischemic stroke-induced astrocytic injury. However, the role of RIP1K in ischemic stroke-induced formation of astrogliosis and glial scar remains unknown. Here, in a transient middle cerebral artery occlusion (tMCAO) rat model and an oxygen and glucose deprivation and reoxygenation (OGD/Re)-induced astrocytic injury model, we show that RIP1K was significantly elevated in the reactive astrocytes. Knockdown of RIP1K or delayed administration of RIP1K inhibitor Nec-1 down-regulated the glial scar markers, improved ischemic stroke-induced necrotic morphology and neurologic deficits, and reduced the volume of brain atrophy. Moreover, knockdown of RIP1K attenuated astrocytic cell death and proliferation and promoted neuronal axonal generation in a neuron and astrocyte co-culture system. Both vascular endothelial growth factor D (VEGF-D) and its receptor VEGFR-3 were elevated in the reactive astrocytes; simultaneously, VEGF-D was increased in the medium of astrocytes exposed to OGD/Re. Knockdown of RIP1K down-regulated VEGF-D gene and protein levels in the reactive astrocytes. Treatment with 400 ng/ml recombinant VEGF-D induced the formation of glial scar; conversely, the inhibitor of VEGFR-3 suppressed OGD/Re-induced glial scar formation. RIP3K and MLKL may be involved in glial scar formation. Taken together, these results suggest that RIP1K participates in the formation of astrogliosis and glial scar via impairment of normal astrocyte responses and enhancing the astrocytic VEGF-D/VEGFR-3 signaling pathways. Inhibition of RIP1K promotes the brain functional recovery partially via suppressing the formation of astrogliosis and glial scar. Graphical Abstract

scholarly journals 8e Protects against Acute Cerebral Ischemia by Inhibition of PI3Kγ-Mediated Superoxide Generation in Microglia

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2828 ◽  
Author(s):  
Linna Wang ◽  
Xiaoli Wang ◽  
Tingting Li ◽  
Yihua Zhang ◽  
Hui Ji
Keyword(s):  
Ischemic Stroke ◽  
Cerebral Ischemia ◽  
Critical Role ◽  
Glucose Deprivation ◽  
Artery Occlusion ◽  
Potential Candidate ◽  
Promising Target ◽  
Acute Cerebral Ischemia ◽  
Penumbral Region ◽  
Phosphoinositide 3 Kinase

The inflammatory response mediated by microglia plays a critical role in the progression of ischemic stroke. Phosphoinositide 3-kinase gamma (PI3Kγ) has been implicated in multiple inflammatory and autoimmune diseases, making it a promising target for therapeutic intervention. The aim of this study was to evaluate the efficacy of 8e, a hydrogen sulfide (H2S) releasing derivative of 3-n-butylphthalide (NBP), on brain damage and PI3Kγ signaling following cerebral ischemia injury. 8e significantly reduced sensorimotor deficits, focal infarction, brain edema and neural apoptosis at 72 h after transient middle cerebral artery occlusion (tMCAO). The NOX2 isoform of the NADPH oxidase family is considered a major enzymatic source of superoxide. We found that the release of superoxide, together with the expression of NOX2 subunits p47phox, p-p47phox, and the upstream PI3Kγ/AKT signaling were all down-regulated by 8e, both in the penumbral region of the rat brain and in the primary cultured microglia subjected to oxygen-glucose deprivation (OGD). With the use of siRNA and pharmacological inhibitors, we further demonstrated that 8e regulates the formation of superoxide in activated microglia through the PI3Kγ/AKT/NOX2 signaling pathway and subsequently prevents neuronal death in neighboring neurons. Our experimental data indicate that 8e is a potential candidate for the treatment of ischemic stroke and PI3Kγ-mediated neuroinflammation.

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