piperidines has been researched along with Brain-Infarction* in 14 studies
1 review(s) available for piperidines and Brain-Infarction
2 trial(s) available for piperidines and Brain-Infarction
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Middle East Respiratory Syndrome (MERS) is a novel respiratory illness firstly reported in Saudi Arabia in 2012. It is caused by a new corona virus, called MERS corona virus (MERS-CoV). Most people who have MERS-CoV infection developed severe acute respiratory illness.. This work is done to determine the clinical characteristics and the outcome of intensive care unit (ICU) admitted patients with confirmed MERS-CoV infection.. This study included 32 laboratory confirmed MERS corona virus infected patients who were admitted into ICU. It included 20 (62.50%) males and 12 (37.50%) females. The mean age was 43.99 ± 13.03 years. Diagnosis was done by real-time reverse transcription polymerase chain reaction (rRT-PCR) test for corona virus on throat swab, sputum, tracheal aspirate, or bronchoalveolar lavage specimens. Clinical characteristics, co-morbidities and outcome were reported for all subjects.. Most MERS corona patients present with fever, cough, dyspnea, sore throat, runny nose and sputum. The presence of abdominal symptoms may indicate bad prognosis. Prolonged duration of symptoms before patients' hospitalization, prolonged duration of mechanical ventilation and hospital stay, bilateral radiological pulmonary infiltrates, and hypoxemic respiratory failure were found to be strong predictors of mortality in such patients. Also, old age, current smoking, smoking severity, presence of associated co-morbidities like obesity, diabetes mellitus, chronic heart diseases, COPD, malignancy, renal failure, renal transplantation and liver cirrhosis are associated with a poor outcome of ICU admitted MERS corona virus infected patients.. Plasma HO-1, ferritin, p21, and NQO1 were all elevated at baseline in CKD participants. Plasma HO-1 and urine NQO1 levels each inversely correlated with eGFR (. SnPP can be safely administered and, after its injection, the resulting changes in plasma HO-1, NQO1, ferritin, and p21 concentrations can provide information as to antioxidant gene responsiveness/reserves in subjects with and without kidney disease.. A Study with RBT-1, in Healthy Volunteers and Subjects with Stage 3-4 Chronic Kidney Disease, NCT0363002 and NCT03893799.. HFNC did not significantly modify work of breathing in healthy subjects. However, a significant reduction in the minute volume was achieved, capillary [Formula: see text] remaining constant, which suggests a reduction in dead-space ventilation with flows > 20 L/min. (ClinicalTrials.gov registration NCT02495675).. 3 组患者手术时间、术中显性失血量及术后 1 周血红蛋白下降量比较差异均无统计学意义(. 对于肥胖和超重的膝关节单间室骨关节炎患者,采用 UKA 术后可获满意短中期疗效,远期疗效尚需进一步随访观察。.. Decreased muscle strength was identified at both time points in patients with hEDS/HSD. The evolution of most muscle strength parameters over time did not significantly differ between groups. Future studies should focus on the effectiveness of different types of muscle training strategies in hEDS/HSD patients.. These findings support previous adverse findings of e-cigarette exposure on neurodevelopment in a mouse model and provide substantial evidence of persistent adverse behavioral and neuroimmunological consequences to adult offspring following maternal e-cigarette exposure during pregnancy. https://doi.org/10.1289/EHP6067.. This RCT directly compares a neoadjuvant chemotherapy regimen with a standard CROSS regimen in terms of overall survival for patients with locally advanced ESCC. The results of this RCT will provide an answer for the controversy regarding the survival benefits between the two treatment strategies.. NCT04138212, date of registration: October 24, 2019.. Results of current investigation indicated that milk type and post fermentation cooling patterns had a pronounced effect on antioxidant characteristics, fatty acid profile, lipid oxidation and textural characteristics of yoghurt. Buffalo milk based yoghurt had more fat, protein, higher antioxidant capacity and vitamin content. Antioxidant and sensory characteristics of T. If milk is exposed to excessive amounts of light, Vitamins B. The two concentration of ZnO nanoparticles in the ambient air produced two different outcomes. The lower concentration resulted in significant increases in Zn content of the liver while the higher concentration significantly increased Zn in the lungs (p < 0.05). Additionally, at the lower concentration, Zn content was found to be lower in brain tissue (p < 0.05). Using TEM/EDX we detected ZnO nanoparticles inside the cells in the lungs, kidney and liver. Inhaling ZnO NP at the higher concentration increased the levels of mRNA of the following genes in the lungs: Mt2 (2.56 fold), Slc30a1 (1.52 fold) and Slc30a5 (2.34 fold). At the lower ZnO nanoparticle concentration, only Slc30a7 mRNA levels in the lungs were up (1.74 fold). Thus the two air concentrations of ZnO nanoparticles produced distinct effects on the expression of the Zn-homeostasis related genes.. Until adverse health effects of ZnO nanoparticles deposited in organs such as lungs are further investigated and/or ruled out, the exposure to ZnO nanoparticles in aerosols should be avoided or minimised. Topics: A549 Cells; Acetylmuramyl-Alanyl-Isoglutamine; Acinetobacter baumannii; Acute Lung Injury; Adaptor Proteins, Signal Transducing; Adenine; Adenocarcinoma; Adipogenesis; Administration, Cutaneous; Administration, Ophthalmic; Adolescent; Adsorption; Adult; Aeromonas hydrophila; Aerosols; Aged; Aged, 80 and over; Aging; Agriculture; Air Pollutants; Air Pollution; Airway Remodeling; Alanine Transaminase; Albuminuria; Aldehyde Dehydrogenase 1 Family; Algorithms; AlkB Homolog 2, Alpha-Ketoglutarate-Dependent Dioxygenase; Alzheimer Disease; Amino Acid Sequence; Ammonia; Ammonium Compounds; Anaerobiosis; Anesthetics, Dissociative; Anesthetics, Inhalation; Animals; Anti-Bacterial Agents; Anti-HIV Agents; Anti-Infective Agents; Anti-Inflammatory Agents; Antibiotics, Antineoplastic; Antibodies, Antineutrophil Cytoplasmic; Antibodies, Monoclonal, Humanized; Antifungal Agents; Antigens, Bacterial; Antigens, CD; Antigens, Differentiation, Myelomonocytic; Antimetabolites, Antineoplastic; Antineoplastic Agents; 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Transistors, Electronic; Translational Research, Biomedical; Transplantation Tolerance; Transplantation, Homologous; Transportation; Treatment Outcome; Tretinoin; Tuberculosis, Multidrug-Resistant; Tuberculosis, Pulmonary; Tubulin Modulators; Tumor Microenvironment; Tumor Necrosis Factor Inhibitors; Tumor Necrosis Factor-alpha; Twins; Ultrasonic Therapy; Ultrasonography; Ultraviolet Rays; United States; Up-Regulation; Uranium; Urethra; Urinary Bladder; Urodynamics; Uromodulin; Uveitis; Vasoconstrictor Agents; Ventricular Function, Left; Vero Cells; Vesicular Transport Proteins; Viral Nonstructural Proteins; Visual Acuity; Vital Capacity; Vitamin D; Vitamin D Deficiency; Vitamin K 2; Vitamins; Volatilization; Voriconazole; Waiting Lists; Waste Disposal, Fluid; Wastewater; Water Pollutants, Chemical; Whole Genome Sequencing; Wine; Wnt Signaling Pathway; Wound Healing; Wounds and Injuries; WW Domains; X-linked Nuclear Protein; X-Ray Diffraction; Xanthines; Xenograft Model Antitumor Assays; YAP-Signaling Proteins; Yogurt; Young Adult; Zebrafish; Zebrafish Proteins; Ziziphus | 2016 |
Moderate hyperglycaemia is associated with favourable outcome in acute lacunar stroke.
Hyperglycaemia in acute ischaemic stroke is traditionally associated with a worsened outcome. However, it is unclear whether the impact of hyperglycaemia on stroke outcome is similar in lacunar and non-lacunar infarctions. The relation between serum glucose measured within 6 h after stroke onset and functional outcome was investigated in 1375 ischaemic stroke patients who had been included in two placebo-controlled trials with lubeluzole. The endpoint was a favourable outcome, defined as a modified Rankin Scale score < or =2 at 3 months. Classification into lacunar (n = 168) and non-lacunar (n = 1207) strokes was based on clinical criteria according to the Oxfordshire Community Stroke Project and findings on brain CT scan. Hyperglycaemia was defined as blood glucose >8 mmol/l. A possible concentration-dependent effect of glucose on outcome was investigated in both lacunar and non-lacunar stroke. Multivariate analysis showed that hyperglycaemia was associated with decreased odds of a favourable outcome in non-lacunar stroke (OR 0.60; 95% CI 0.41-0.88, P = 0.009), but with increased odds of a favourable outcome in lacunar stroke (multivariate OR for glucose >8 mmol/l: 2.70; 95% CI 1.01-7.13, P = 0.048). In non-lacunar stroke, there appeared to be a concentration-effect relation, as the odds of favourable outcome gradually decreased with increasing glucose levels. In lacunar stroke, an association with favourable outcome was observed with glucose levels >8 mmol/l, but this beneficial effect diminished with more severe hyperglycaemia >12 mmol/l. In conclusion, hyperglycaemia has a detrimental effect in non-lacunar stroke, but moderate hyperglycaemia may be beneficial in lacunar stroke. Topics: Acute Disease; Aged; Aged, 80 and over; Blood Glucose; Brain Infarction; Female; Humans; Hyperglycemia; Male; Middle Aged; Neuroprotective Agents; Piperidines; Prognosis; Severity of Illness Index; Stroke; Thiazoles; Treatment Outcome | 2007 |
12 other study(ies) available for piperidines and Brain-Infarction
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JZL184, as a monoacylglycerol lipase inhibitor, down-regulates inflammation in a cannabinoid pathway dependent manner.
Stroke is a prevalent disorder which is associated with several complications including inflammation. JZL-184 (JZL) inhibits arachidonic acid (AA) production and consequently results in two-arachidonoylglycerol (2-AG) accumulation. Both reduced production of AA metabolic products and increased 2-AG, the agonist of type 1 cannabinoid receptor (CB1), can result in reduced inflammation. In this study, we investigated the mechanisms of JZL in the improvement of stroke complications in mouse permanent cerebral ischemia (PPMCAO) model using AM251, the antagonist of CB1.. PMCAO mice were divided into six groups including intact, controls, vehicle, JZL, AM251 and JZL plus AM251 administrated groups. Brain infarction and edema, brain levels of matrix metalloperoteinase-9 (MMP9), interleukin (IL)-10 and tumor necrosis factor-α (TNF-α) and behavioral functions have been examined in all groups.. The results showed that JZL lowered brain infarction, neurological disorders, TNF-α and MMP9 more effectively than JZL plus AM251. JZL and JZL plus AM251 reduced brain edema and increased brain IL-10. JZL, AM251 and JZL plus AM251 improve behavioral functions.. JZL reduces brain infarction and brain pro-inflammatory molecules in CB1 pathway dependent manner. JZL also reduces brain edema and increased IL-10 in CB1 pathways or decreased AA metabolites. Further, AM251 improves behavioral functions via unknown mechanisms. Topics: Animals; Benzodioxoles; Brain Edema; Brain Infarction; Cannabinoids; Down-Regulation; Enzyme Inhibitors; Inflammation; Interleukin-10; Male; Matrix Metalloproteinase 9; Mice; Monoacylglycerol Lipases; Piperidines; Pyrazoles; Signal Transduction; Tumor Necrosis Factor-alpha | 2018 |
Stereotypy after cerebellar infarction.
Topics: Aged; Brain Infarction; Cerebellar Diseases; Cholinesterase Inhibitors; Cilostazol; Donepezil; Female; Fluorodeoxyglucose F18; Humans; Indans; Magnetic Resonance Angiography; Neurologic Examination; Neuroprotective Agents; Piperidines; Stereotyped Behavior; Tetrazoles; Tomography, Emission-Computed, Single-Photon | 2014 |
Alogliptin, a dipeptidylpeptidase-4 inhibitor, for patients with diabetes mellitus type 2, induces tolerance to focal cerebral ischemia in non-diabetic, normal mice.
Effective interventions that provide obvious neuroprotection are currently fairly limited. Glucagon-like peptide-1 (GLP-1), an enhancer of insulin production with a trophic effect on β cells in the islets, has been found to be trophic for neuronal cells. Alogliptin benzoate (AGL), a selective inhibitor of dipeptidylpeptidase-4 (DPP-4) functioning as a long-acting agonist of GLP-1, is in clinical use worldwide for patients with diabetes mellitus type 2. To clarify whether administration of AGL, independent of the insulinotropic effect, protects the brain against focal ischemia, we investigated the effect of AGL on the development of cerebral infarction in non-diabetic normal mice. Male C57BL/6J mice were administered AGL (7.5, 15, or 30μg) once a day for three weeks by intragastric gavage. After the induction of temporary focal ischemia, volumes of infarcted lesions and neurological deficits were analyzed at 24h (acute phase) and seven days (chronic phase). In the acute phase, significant reductions were observed in the volumes of infarcted lesions (p=0.009), and in the severity of neurological deficits (p=0.004), in the group treated with 15μg of alogliptin benzoate, but not the 7.5 or 30μg-treated groups. This significant reduction in volumes of infarcted lesions persisted into the chronic phase. At the end of the AGL treatment; before the induction of ischemia, the levels of brain-derived neurotrophic factor (BDNF), a potent neuroprotectant in the brain, were elevated in the cortex (p=0.008), or in the whole forebrain (p=0.023). AGL could be used as a daily neuroprotectant or an enhancer of BDNF production aiming to attenuate cerebral injuries, for the growing number of people who have the risk of ischemic stroke. Topics: Analysis of Variance; Animals; Brain Edema; Brain Infarction; Brain Ischemia; Brain-Derived Neurotrophic Factor; Dipeptidyl-Peptidase IV Inhibitors; Disease Models, Animal; Dose-Response Relationship, Drug; Gene Expression Regulation; Laser-Doppler Flowmetry; Male; Mice; Mice, Inbred C57BL; Microcirculation; Nervous System Diseases; Piperidines; Prosencephalon; Time Factors; Uracil | 2013 |
Endothelin B receptor agonist, IRL-1620, reduces neurological damage following permanent middle cerebral artery occlusion in rats.
Endothelin and its receptors have long been considered therapeutic targets in the treatment of ischemic stroke. Recent studies indicate that ET(B) receptors may provide both vasodilatation and neuroprotection. The purpose of this study was to determine the effect of selectively activating the ET(B) receptors following permanent middle cerebral artery occlusion in rats. IRL-1620 [Suc-[Glu9,Ala11,15]-Endothelin-1(8-12)], a highly selective ET(B) agonist, was used alone and in conjunction with BQ788, an ET(B) antagonist, to determine the role of ET(B) receptors in cerebral ischemia. Rats were assessed for neurological deficit and motor function, and their brains were evaluated to determine infarct area, oxidative stress parameters, and ET receptor protein levels. Animals treated with IRL-1620 showed significant improvement in all neurological and motor function tests when compared with both vehicle-treated and BQ788-treated middle cerebral artery occluded groups. In addition, there was a significant decrease in infarct volume 24h after occlusion in animals treated with IRL-1620 (24.47±4.37mm(3)) versus the vehicle-treated group (153.23±32.18mm(3)). Blockade of ET(B) receptors by BQ788 followed by either vehicle or IRL-1620 treatment resulted in infarct volumes similar to those of rats treated with vehicle alone (163.51±25.41 and 139.21±15.20mm(3), respectively). Lipid peroxidation, as measured by malondialdehyde, increased and antioxidants (superoxide dismutase and reduced glutathione) decreased following infarct. Treatment with IRL-1620 reversed these effects, indicating that ET(B) receptor activation reduces oxidative stress injury following ischemic stroke. Animals pretreated with BQ788 showed similar oxidative stress damage as those in the vehicle-treated group. No significant difference was observed in ET(B) receptor levels in any of the groups. The present study demonstrates that ET(B) receptor activation may be a novel neuroprotective therapy in the treatment of focal ischemic stroke. Topics: Analysis of Variance; Animals; Brain Infarction; Disease Models, Animal; Dose-Response Relationship, Drug; Endothelin B Receptor Antagonists; Endothelins; Gene Expression Regulation; Glutathione; Infarction, Middle Cerebral Artery; Male; Malondialdehyde; Motor Activity; Muscle Strength; Nervous System Diseases; Neurologic Examination; Oligopeptides; Peptide Fragments; Piperidines; Psychomotor Performance; Rats; Rats, Sprague-Dawley; Receptor, Endothelin B; Rotarod Performance Test; Superoxide Dismutase | 2011 |
The novel radical scavenger IAC is effective in preventing and protecting against post-ischemic brain damage in Mongolian gerbils.
The removal of pathologically generated free radicals produced during ischemia, reperfusion and intracranical hemorrhage seems to be a viable approach to neuroprotection. However, at present, no neuroprotective agent has proven effective in focal ischemic stroke phase III trials, despite the encouraging data in animal models. This study aimed to explore the effect of the brain penetrant low molecular weight radical scavenger bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)-decandioate (IAC) in neurological damage subsequent to ischemia-reperfusion injury in Mongolian gerbils. We examined the intraperitoneal effects of IAC on temporary bilateral common carotid artery occlusion (BCCO) by means of morphological and histological analysis of the hippocampus. Significant dose-dependent protective effects of IAC (1 to 10mg/kg b.w.) against neuropathological and morphological brain changes were seen when administered i.p. 1h before temporary BCCO in Mongolian gerbils. When administered up to 6h after BCCO, IAC actually reverses the neurodegenerative processes (e.g. hippocampal cell viability) induced by ischemia in a dose-dependent fashion. Data show that IAC is highly effective in protecting and preventing oxidative brain damage associated with cerebral flow disturbances. It is also effective even in late treatment of the insult, emphasizing its potential role for the management of ischemic stroke patients. Topics: Animals; Brain Damage, Chronic; Brain Infarction; Brain Ischemia; Carotid Stenosis; Cell Survival; Disease Models, Animal; Dose-Response Relationship, Drug; Free Radical Scavengers; Gerbillinae; Hippocampus; Infusions, Parenteral; Male; Nerve Degeneration; Neuroprotective Agents; Oxidative Stress; Piperidines; Treatment Outcome | 2010 |
Delayed combinatorial treatment with flavopiridol and minocycline provides longer term protection for neuronal soma but not dendrites following global ischemia.
We previously reported that delayed administration of the general cyclin-dependent kinase inhibitor flavopiridol following global ischemia provided transient neuroprotection and improved behavioral performance. However, it failed to provide longer term protection. In the present study, we investigate the ability of delayed flavopiridol in combination with delayed minocycline, another neuroprotectant to provide sustained protection following global ischemia. We report that a delayed combinatorial treatment of flavopiridol and minocycline provides synergistic protection both 2 and 10 weeks following ischemia. However, protected neurons in the hippocampal CA1 are synaptically impaired as assessed by electrophysio logical field potential recordings. This is likely because of the presence of degenerated processes in the CA1 even with combinatorial therapy. This indicates that while we have addressed one important pre-clinical parameter by dramatically improving long-term neuronal survival with delayed combinatorial therapy, the issue of synaptic preservation of protected neurons still exists. These results also highlight the important observation that protection does not always lead to proper function. Topics: Animals; Anti-Bacterial Agents; Brain Infarction; Brain Ischemia; Dendrites; Disease Models, Animal; Drug Administration Schedule; Drug Synergism; Drug Therapy, Combination; Flavonoids; Hippocampus; Male; Minocycline; Nerve Degeneration; Neural Pathways; Neurons; Neuroprotective Agents; Piperidines; Protein Kinase Inhibitors; Rats; Rats, Wistar; Synaptic Transmission; Time Factors; Treatment Outcome | 2008 |
Synthesis and structure-activity relationships of novel selective factor Xa inhibitors with a tetrahydroisoquinoline ring.
A series of novel 2,7-disubstituted tetrahydroisoquinoline derivatives were designed and synthesized. Among these derivatives, compounds 1 and 2 exhibited potent inhibitory activity against factor Xa (FXa) and good selectivity with respect to other serine proteases (thrombin, plasmin, and trypsin). In addition, compound 2 exhibited potent anti-FXa activity after intravenous and oral administration to cynomolgus monkeys, showed a dose-dependent antithrombotic effect at 0.1, 0.3, and 1 mg kg(-1) h(-1) in a rat model of venous thrombosis, and significantly reduced the size of brain infarction in a middle cerebral artery occlusion model at a dose of 0.1 mg kg(-1) h(-1). These results suggest that compound 2 (JTV-803) is likely to be useful as both a venous and arterial antithrombotic agent. Topics: Administration, Oral; Animals; Arterial Occlusive Diseases; Brain Infarction; Cerebral Arterial Diseases; Factor Xa; Factor Xa Inhibitors; Fibrinolytic Agents; Humans; Injections, Intravenous; Isoquinolines; Macaca fascicularis; Middle Cerebral Artery; Models, Molecular; Piperidines; Pyridines; Rats; Structure-Activity Relationship; Tetrahydroisoquinolines; Venous Thrombosis | 2005 |
Anandamide content is increased and CB1 cannabinoid receptor blockade is protective during transient, focal cerebral ischemia.
The role of endocannabinoid signaling in the response of the brain to injury is tantalizing but not clear. In this study, transient middle cerebral artery occlusion (MCAo) was used to produce ischemia/reperfusion injury. Brain content of N-arachidonoylethanolamine (AEA) and 2-arachidonoylglycerol were determined during MCAo. Whole brain AEA content was significantly increased after 30, 60 and 120 min MCAo compared with sham-operated brain. The increase in AEA was localized to the ischemic hemisphere after 30 min MCAo, but at 60 and 120 min, was also increased in the contralateral hemisphere. 2-Arachidonoylglycerol content was unaffected by MCAo. In a second set of studies, injury was assessed 24 h after 2 h MCAo. Rats administered a single dose (3 mg/kg) of the cannabinoid receptor type 1 (CB1) receptor antagonist SR141716 prior to MCAo exhibited a 50% reduction in infarct volume and a 40% improvement in neurological function compared with vehicle control. A second CB1 receptor antagonist, LY320135 (6 mg/kg), also significantly improved neurological function. The CB1 receptor agonist, WIN 55212-2 (0.1-1 mg/kg) did not affect either infarct volume or neurological score. Topics: Animals; Arachidonic Acids; Benzofurans; Benzoxazines; Blood Pressure; Brain Chemistry; Brain Infarction; Chromatography, Liquid; Disease Models, Animal; Dose-Response Relationship, Drug; Endocannabinoids; Hemodynamics; Infarction, Middle Cerebral Artery; Ischemic Attack, Transient; Male; Mass Spectrometry; Morpholines; Naphthalenes; Neurologic Examination; Piperidines; Polyunsaturated Alkamides; Pyrazoles; Rats; Rats, Wistar; Receptor, Cannabinoid, CB1; Reperfusion Injury; Rimonabant; Tetrazolium Salts; Time Factors | 2004 |
Cannabidiol prevents infarction via the non-CB1 cannabinoid receptor mechanism.
Cannabidiol, a non-psychoactive constituent of cannabis, has been reported as a neuroprotectant. Cannabidiol and Delta(9)-tetrahydrocannabinol, the primary psychoactive constituent of cannabis, significantly decreased the infarct volume at 4 h in the mouse middle cerebral artery occlusion model. The neuroprotective effects of Delta(9)-tetrahydrocannabinol but not cannabidiol were inhibited by SR141716, a cannabinoid CB1 receptor antagonist, and were abolished by warming of the animals to the levels observed in the controls. Delta(9)-Tetrahydrocannabinol significantly decreased the rectal temperature, and the hypothermic effect was inhibited by SR141716. These results surely show that the neuroprotective effect of Delta(9)-tetrahydrocannabinol are via a CB1 receptor and temperature-dependent mechanisms whereas the neuroprotective effects of cannabidiol are independent of CB1 blockade and of hypothermia. Topics: Analysis of Variance; Animals; Body Temperature; Brain Infarction; Cannabidiol; Disease Models, Animal; Dose-Response Relationship, Drug; Dronabinol; Drug Interactions; Fever; Infarction, Middle Cerebral Artery; Male; Mice; Neuroprotective Agents; Piperidines; Pyrazoles; Receptor, Cannabinoid, CB1; Rimonabant; Tetrazolium Salts; Time Factors | 2004 |
Reduced brain infarct volume and improved neurological outcome by inhibition of the NR2B subunit of NMDA receptors by using CP101,606-27 alone and in combination with rt-PA in a thromboembolic stroke model in rats.
A novel postsynaptic antagonist of N-methyl-D-aspartate (NMDA) receptors, CP-101,606-27 may attenuate the effects of focal ischemia. In current experiments, the authors investigated its neuroprotective effect alone and in combination with recombinant tissue plasminogen activator (rt-PA) in thromboembolic focal cerebral ischemia in rats.. Forty-eight male Wistar rats underwent embolization of the right middle cerebral artery to produce focal cerebral ischemia. After random division into six groups (eight rats in each group), animals received: vehicle; low-dose (LD) CP-101, 606-27, 14.4 mg/kg; high-dose (HD) CP- 101,606-27, 28.8 mg/kg; rt-PA, 10 mg/kg; low-dose combination (LDC) CP- 101,606-27, 14.4 mg/kg plus rt-PA, 10 mg/kg; or high-dose combination (HDC) CP- 101,606-27, 28.8 mg/kg plus rt-PA, 10 mg/kg) 2 hours after induction of embolic stroke. Animals were killed 48 hours after the onset of focal ischemia. Brain infarction volume, neurobehavioral outcome, poststroke seizure activity, poststroke mortality, and intracranial hemorrhage incidence were observed and evaluated. Compared with vehicle-treated animals (39.4 +/- 8.6%) 2 hours posttreatment with CP-101,606-27 or rt-PA or in combination a significant reduction in the percentage of brain infarct volume was seen (LD CP-101,606-27: 20.8 +/- 14.3%, p < 0.05; HD CP-101,606-27: 10.9 +/- 3.2%, p < 0.001; rt-PA: 21.1 +/- 7.3%, p < 0.05; LDC, 18.6 +/- 11.5%, p < 0.05; and HDC: 15.2 +/- 10.1%, p < 0.05; compared with control: 39.4 +/- 8.6%). Combination of CP-101,606-27 with rt-PA did not show a significantly enhanced neuroprotective effect. Except for the control and LDC treatment groups, neurobehavioral outcome was significantly improved 24 hours after embolic stroke in animals in all other active therapeutic groups receiving CP-101,606-27 or rt-PA or in combination. The authors also observed that treatment with HD CP-101,606-27 decreased poststroke seizure activity.. The data in this study suggested that postischemia treatment with CP-101,606-27 is neuroprotective in the current stroke model; however, the authors also note that although rt-PA may offer modest protection when used alone, combination with CP-101,606-27 did not appear to enhance its effects. Topics: Animals; Brain Infarction; Disease Models, Animal; Drug Therapy, Combination; Male; Nervous System Diseases; Neuroprotective Agents; Piperidines; Plasminogen Activators; Rats; Rats, Wistar; Receptors, N-Methyl-D-Aspartate; Recombinant Proteins; Severity of Illness Index; Stroke; Thromboembolism; Tissue Plasminogen Activator | 2003 |
Donepezil reverses a mnemonic deficit produced by scopolamine but not by perforant path lesion or transient cerebral ischaemia.
The purpose of these studies were threefold. Firstly, to further characterize the effect of perforant path transection on a test of short-term memory: delayed matching (or nonmatching)-to-position [D(N)MTP]. Secondly, to evaluate the effect of a transient cerebral ischaemia in the same task. Both surgical procedures were chosen as they produce a CNS lesion similar to that described in Alzheimer's Disease (AD). Thirdly, the effect of the acetylcholinesterase inhibitor, donepezil (Aricept(R), E2020), on the resulting cognitive impairment was studied. Perforant path transection produced a robust, delay-dependent impairment of choice accuracy in rats performing either a delayed matching- or nonmatching-to-position task. Sample latency was also reduced following lesion, yet the lesion-induced impairment was not affected by increasing the response requirement at the sample stage. An 11-min period of transient ischaemia (two-vessel occlusion model) resulted in almost complete loss of hippocampal CA1 pyramidal cells and a delay-dependent impairment in DMTP performance. However, unlike perforant path lesions, this deficit was unstable and declined in magnitude over the experimental period. Increasing the delay interval restored this deficit. Donepezil, at doses that robustly attenuated a scopolamine (0.06 mg/kg s.c.)-induced DMTP accuracy impairment in naïve, unoperated rats, had no effect against either lesion-induced impairment. The results are considered in terms of the effectiveness of acetylcholinesterase inhibitors in noncholinergic-based preclinical cognitive models. Topics: Alzheimer Disease; Animals; Brain Infarction; Brain Ischemia; Cell Death; Cholinesterase Inhibitors; Disease Models, Animal; Donepezil; Dose-Response Relationship, Drug; Drug Interactions; Hippocampus; Indans; Male; Memory Disorders; Muscarinic Antagonists; Perforant Pathway; Piperidines; Rats; Rats, Wistar; Reaction Time; Reperfusion Injury; Scopolamine | 2002 |
The effects of oral and intravenous direct thrombin inhibitors on the size of photochemically induced cortical infarction in rats.
Oral thrombin inhibitors are under development as potential drugs for prophylaxis and treatment of thrombotic events. The effect of pretreatment with two direct thrombin inhibitors, melagatran and inogatran, was evaluated in a rat model of cerebral infarction. Ischaemic stroke was induced by photochemical reaction after an injection of Rose Bengal and focused posterior and to the right of the intersection of the coronal and sagittal sutures on the intact calvarium. A single oral dose of melagatran (30 micromol/kg) significantly reduced the volume of the cortical infarct by 53% (P<.05) compared with control. In addition, following intravenous inogatran (6 micromol/kg) or oral inogatran (100 micromol/kg), the volume of the cortical infarct decreased by 83% and 19%, respectively, compared with control. This study showed that experimental focal ischaemic infarction, elicited by photochemically induced endothelial cell damage, can be significantly reduced with melagatran and inogatran, direct thrombin inhibitors. Topics: Administration, Oral; Animals; Antithrombins; Azetidines; Benzylamines; Brain Infarction; Cerebral Cortex; Drug Evaluation, Preclinical; Glycine; Hypertension; Injections, Intravenous; Light; Male; Photochemistry; Piperidines; Rats; Rats, Inbred SHR | 2001 |