scholarly journals Acute Treatment with Rosuvastatin Protects Insulin Resistant (C57BL/6J ob/ob) Mice against Transient Cerebral Ischemia

2008 ◽  
Vol 28 (12) ◽  
pp. 1927-1935 ◽  
Author(s):  
Keita Mayanagi ◽  
Prasad V Katakam ◽  
Tamas Gáspár ◽  
Ferenc Domoki ◽  
David W Busija
Keyword(s):  
Cerebral Ischemia ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Artery Occlusion ◽  
Blood Cholesterol ◽  
Doppler Flowmetry ◽  
Insulin Resistant ◽  
Transient Focal Cerebral Ischemia ◽  
Intracellular Adhesion Molecule ◽  
Cerebral Artery Occlusion

The purpose of this study was to investigate the short-term effects of rosuvastatin (RSV), a 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitor, on transient, focal cerebral ischemia in C57BL/6J ob/ob mice with insulin resistance (IR). Male ob/ob, lean, or wild-type (WT) mice were treated with RSV (10 mg/kg per day, i.p.) or vehicle for 3 days. Ischemia was induced by 60 mins of middle cerebral artery occlusion (MCAO) and cortical blood flow (CBF) was monitored by laser-Doppler flowmetry. Infarct volumes were measured 24 h after reperfusion. IR mice exhibited a higher infarct volume compared with Lean or WT mice, and RSV reduced infarct volume only in obese mice (40% ± 3% versus 32% ± 3%, P < 0.05). Blood cholesterol and insulin levels were elevated in ob/ob mice but were unaffected by RSV. The CBF reductions during MCAO were similar in all groups and were not affected by RSV. Although RSV did not increase cortical endothelial NO synthase (eNOS) levels in the ob/ob mice, it attenuated the increased cortical expression of intracellular adhesion molecule-1 (ICAM-1) after MCAO from ob/ob mice. Thus, RSV protects against stroke in IR mice by a mechanism independent of effects on the lipid profile, CBF, or eNOS but dependent on suppression of post-MCAO ICAM-1 expression.

scholarly journals Effects of Pretreatment with a Combination of Melatonin and Electroacupuncture in a Rat Model of Transient Focal Cerebral Ischemia

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Lingguang Liu ◽  
R. T. F. Cheung
Keyword(s):  
Cerebral Ischemia ◽  
Rat Model ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Artery Occlusion ◽  
Sprague Dawley ◽  
Brain Infarct ◽  
Beneficial Effects ◽  
Transient Focal Cerebral Ischemia ◽  
Cerebral Artery Occlusion

Both melatonin and electroacupuncture (EA) have been suggested to be effective treatments against stroke. However, it is unknown whether a combination of these two therapies could be beneficial against transient focal cerebral ischemia. The present study investigated the effects of pretreatment of a combination of melatonin and EA in a rat model of transient middle cerebral artery occlusion (MCAO). After pretreatment of melatonin plus EA (MEA), transient MCAO was induced for 90 minutes in male Sprague-Dawley (SD) rats. The neurological deficit score, brain infarct volume, cerebral edema ratio, neuronal inflammation, and apoptosis were evaluated 24 hours after transient MCAO. The expression of related inflammatory and apoptotic mediators in the brain was also investigated. The results showed that MEA improved neurological outcome, reduced brain infarct volume, and inhibited neuronal inflammation as well as apoptosis 24 hours after transient MCAO. The beneficial effects may derive from downregulation of proinflammatory and proapoptotic mediators and upregulation of antiapoptotic mediators. Thus, these results suggest a preventive effect of pretreatment of MEA on transient focal cerebral ischemia.

scholarly journals Cortical Spreading Depression Protects against Subsequent Focal Cerebral Ischemia in Rats

1996 ◽  
Vol 16 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Kazushi Matsushima ◽  
Matthew J. Hogan ◽  
Antoine M. Hakim
Keyword(s):  
Cerebral Ischemia ◽  
Cortical Spreading Depression ◽  
Spreading Depression ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Occipital Cortex ◽  
Artery Occlusion ◽  
Microdialysis Probe ◽  
Cerebral Artery Occlusion ◽  
Subcortical Infarct

The possibility that cortical spreading depression (CSD) may have neuroprotective action during subsequent focal cerebral ischemia was examined in rats. Three days before the imposition of focal cerebral ischemia CSDs were elicited by applying potassium chloride (KCl) for 2 h through a microdialysis probe implanted in the occipital cortex. Control animals were handled identically except that saline was infused instead of KCl. Focal ischemia was produced by the intraluminal suture method and cortical and subcortical infarct volumes were measured 7 days later. Neocortical infarct volume was reduced from 124.8 ± 49.5 mm3 in the controls to 62.9 ± 59.5 mm3 in the animals preconditioned with CSD (p = 0.012). There was no difference between the two groups in the subcortical infarct volume or in CBF, measured by the hydrogen clearance method, during or immediately after the ischemic interval. Our data indicate that preconditioning CSD applied 3 days before middle cerebral artery occlusion may increase the brain's resistance to focal ischemic damage and may be used as a model to explore the neuroprotective molecular responses of neuronal and glial cells.

scholarly journals Inhibition of MicroRNA-383 Ameliorates Injury After Focal Cerebral Ischemia via Targeting PPARγ

2016 ◽  
Vol 39 (4) ◽  
pp. 1339-1346 ◽  
Author(s):  
Lichun Pei ◽  
Songyan Meng ◽  
Weigang Yu ◽  
Qiujun Wang ◽  
Fangfang Song ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Middle Cerebral Artery ◽  
Middle Cerebral Artery Occlusion ◽  
Cerebral Artery ◽  
Protein Level ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Artery Occlusion ◽  
Luciferase Assay ◽  
Cerebral Artery Occlusion

Background: Peroxisome proliferator-activated receptor gamma (PPARγ) plays a critical role in protecting against distinct brain damages, including ischemia. Our previous data have shown that the protein level of PPARγ is increased in the cortex after middle cerebral artery occlusion (MCAO); PPARγ up-regulation contributes to PPARγ activation and is effective in reducing ischemic damage to brain. However, the regulatory mechanism of PPARγ after focal cerebral ischemia in rats is still unclear. In this study, we evaluated the effect of microRNA on PPARγ in rats subjected to MCAO. Methods: Focal cerebral ischemia was established by surgical middle cerebral artery occlusion; the protein level of PPARγ was detected by Western blotting; the level of microRNA-383 (miR-383) was quantified by real-time PCR; the neurological outcomes were defined by infarct volume and neurological deficits. Luciferase assay was used to identify the luciferase activities of PPARγ and miR-383. Results: We showed here that miR-383 level was down-regulated in the ischemic hemisphere of rats 24h after MCAO. Overexpression of miR-383 by miR-383 agomir increased infarct volume and aggravated neurological damage. Administration of miR-383 antagomir had the opposite effects. Furthermore, we found that PPARγ protein was down-regulated by miR-383 overexpression, and up-regulated by miR-383 inhibition both in rat model of MCAO and in primary culture cells. Finally, we found that miR-383 suppressed the luciferase activity of the vector carrying the 3'UTR of PPARγ, whereas mutation of the binding sites relived the repressive effect of miR-383. Conclusion: Our study demonstrated that miR-383 may play a key role in focal cerebral ischemia by regulating PPARγ expression at the post-transcriptional level, and miR-383 may be a potential therapeutic target for stroke.

scholarly journals Intraventricular Brain-Derived Neurotrophic Factor Reduces Infarct Size after Focal Cerebral Ischemia in Rats

1997 ◽  
Vol 17 (5) ◽  
pp. 500-506 ◽  
Author(s):  
Wolf-R. Schäbitz ◽  
Stefan Schwab ◽  
Matthias Spranger ◽  
Werner Hacke
Keyword(s):  
Cerebral Ischemia ◽  
Infarct Size ◽  
Middle Cerebral Artery ◽  
Middle Cerebral Artery Occlusion ◽  
Neurotrophic Factor ◽  
Cortical Neurons ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Artery Occlusion ◽  
Cerebral Artery Occlusion

Brain-derived neurotrophic factor (BDNF), acting through the high-affinity receptor tyrosine kinase (TrkB), is widely distributed throughout the central nervous system and displays in vitro trophic effects on a wide range of neuronal cells, including hippocampal, cerebellar, and cortical neurons. In vivo, BDNF rescues motorneurons, hippocampal, and substantia nigral dopaminergic cells from traumatic and toxic brain injury. After transient middle cerebral artery occlusion (MCAO), upregulation of BDNF-mRNA in cortical neurons suggests that BDNF potentially plays a neuroprotective role in focal cerebral ischemia. In the current study, BDNF (2.1 μg/d) in vehicle or vehicle alone (controls) was delivered intraventricularly for 8 days, beginning 24 hours before permanent middle cerebral artery occlusion by intraluminal suture in Wistar rats (n = 13 per group). There were no differences in physiological variables recorded during surgery for the two groups. Neurological deficit (0 to 4 scale), which was assessed on a daily basis, improved in BDNF-treated animals compared with controls ( P < 0.05; analysis of variance and Scheffe's test). There were no significant differences in weight in BDNF-treated animals and controls during the experiment. After elective killing on day 7 after MCAO, brains underwent 2,3,5-triphenyltetrazolium chloride staining for calculation of the infarct volume and for histology (hematoxylin and eosin and glial fibrillary acid protein). The mean total infarct volume was 83.1 ± 27.1 mm3 in BDNF-treated animals and 139.2 ± 56.4 mm3 in controls (mean ± SD; P < 0.01, unpaired, two-tailed t-test). The cortical infarct volume was 10.8 ± 7.1 mm3 in BDNF-treated animals and 37.9 ± 19.8 mm3 in controls (mean ± SD; P < 0.05; unpaired, two-tailed t-test), whereas ischemic lesion volume in caudoputaminal infarction was not significantly different. These results show that pretreatment with intraventricular BDNF reduces infarct size after focal cerebral ischemia in rats and support the hypothesis of a neuroprotective role for BDNF in stoke.

scholarly journals Inflammatory cell populations in early neuroinflammation in the core and peri-ischemic lesions of rat brain after transient focal cerebral ischemia: A morphometric study

2018 ◽  
Author(s):  
Emoke Horvath ◽  
Alex Oradan ◽  
Liviu Chiriac ◽  
Minodora Dobreanu ◽  
Előd-Ernő Nagy ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Rat Model ◽  
Inflammatory Cell ◽  
Focal Cerebral Ischemia ◽  
Artery Occlusion ◽  
The Core ◽  
Transient Focal Cerebral Ischemia ◽  
Cox 2 ◽  
Cerebral Artery Occlusion

Background and Objective: Clinical and experimental observations emphasize the role of inflammation as a direct risk factor for stroke. To better characterize the inflammation, we have conducted a detailed histological analysis of the inflammatory cell population after transient middle cerebral artery occlusion in a rat model. Methods: Fifteen adult Wistar male rats were divided randomly into test (n=10) and sham (n=5) groups. In the ischemic group, transient focal cerebral ischemia was induced with an intraluminal filament technique. Histologic lesions of the ischemic core and the surrounding penumbra zone were evaluated, based on a complex algorithm. Representative morphological changes in the core and the penumbra zone were compared. Immunohistochemistry was performed for leukocytes markers (CD15, CD68, CD3), leukocyte-released effectors (MMP-9 and COX-2), and FXIII (possibly involved in microglia and macrophage activation) Results: Neuronal vacuolation and degeneration were significantly more in the core lesion, whereas cellular edema and inflammatory infiltrate were increased in the penumbra. CD68, CD3, FXIII and Cox-2 expression were significantly higher in the penumbra than in the core (p=0.026; p=0.006; p=0.002; and p<0.001). Discussion: In the rat model of middle cerebral artery occlusion, inflammatory mechanisms, microglia/macrophage cells, and T-lymphocytes likely play an important role in the penumbra. The deterioration of neurons is less in the penumbra than in the core. Appreciation of the role of the inflammatory cells and mechanisms involved in stroke might lead to measures to inhibit the injury and save brain volume.

scholarly journals Effect of combined therapy with hyperbaric oxygen and an antioxidant on infarct volume after permanent focal cerebral ischemia

2007 ◽  
pp. 369-373
Author(s):  
G Acka ◽  
A Sen ◽  
Z Canakci ◽  
S Yildiz ◽  
A Akin ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Hyperbaric Oxygen ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Combined Therapy ◽  
Artery Occlusion ◽  
Control Group ◽  
Male Wistar Rats ◽  
Cerebral Artery Occlusion ◽  
Reduce Infarct Volume

The aim of the present study was to evaluate the efficiency of combination of hyperbaric oxygen (HBO) and an antioxidant on permanent focal cerebral ischemia. Male Wistar rats underwent permanent middle cerebral artery occlusion (MCAO). Then, animals were randomly assigned to one of four groups: the control group (n=9) received no treatment, HBO group (n=9) was treated for 90 min at 2.5 absolute atmosphere for 3 days, the U-74389G group (n=8) received single U-74389G injection (3 mg/kg), the HBO + U-74389G group (n=8) received both HBO and U-74389G treatments. Treatments were initiated within the first 10 min after MCAO. After 3 days, the infarct volumes in rat brains were measured. The infarct ratios were 25.6+/-6.5 % for the control group, 21.9+/-6.4 % for the HBO group, 15.7+/-5.7 % for U-74389G group and 12.5+/-3.8 % for HBO + U74389G group. The infarct volumes were significantly reduced in rats treated with U-74389G (p<0.05) and combination therapy (p<0.05). HBO failed to reduce infarct volume significantly. We concluded that 1) U-74389G is more beneficial than HBO on permanent MCAO in rats, and 2) a combined therapy failed to significantly improve infarct volume more than either single treatment.

Abstract 154: Protection from Transient Focal Cerebral Ischemia by Transfusion of Polynitroxylated Pegylated Hemoglobin

Stroke ◽  
2013 ◽  
Vol 44 (suppl_1) ◽  
Author(s):  
Jian Zhang ◽  
Suyi Cao ◽  
Li Ma ◽  
Carleton J Hsia ◽  
Raymond C Koehler
Keyword(s):  
Vascular Function ◽  
Focal Cerebral Ischemia ◽  
Infarct Volume ◽  
Artery Occlusion ◽  
Border Region ◽  
Therapeutic Window ◽  
Laser Doppler Flow ◽  
Transient Focal Cerebral Ischemia ◽  
Cerebral Artery Occlusion ◽  
Hemispheric Infarct

Polynitroxylation of hemoglobin (Hb) confers superoxide dismutase and catalase mimetic activity and can protect neurons from native Hb and glutamate. Here, we determined if transfusion of polynitroxylated pegylated Hb (PNPH) is protective in the rat filament model of 2 h of middle cerebral artery occlusion (MCAO). Transfusion of 10 ml/kg of PNPH at 20 min of MCAO reduced the median infarct volume in cerebral cortex from 40% (37-47% interquartile range; n=10) in controls to 3% (0-7%; n=10; P<0.001) with PNPH and in striatum from 78% (66-88%) to 34% (0-37%; P<0.001). The therapeutic window was evaluated in a second experiment. Compared to the control median hemispheric infarct volume of 22% (13-34%; n=15), infarct volume was reduced to 7% (3-13%; n=14; P<0.05) when PNPH was transfused at 4 h after MCAO (2 h of reperfusion) but not significantly when transfused at 6 h (8%; 3-35%; n=14) or at 8 h (12%; 10-25%; n=14) after MCAO. To determine whether PNPH might act by promoting vasodilation, pial arteriolar diameter in the distal MCA border region was measured in closed cranial windows during MCAO. With no transfusion, MCAO induced an initial dilation (36±5%; ±SD; n=8) that subsided by 2 h (5±11%). With PNPH transfusion at 20 min of MCAO, the initial dilation (31±8%; n=7) was better maintained at 2 h (21±11%; P<0.02). To determine whether delaying PNPH transfusion until 90 min of MCAO would improve penumbral perfusion, laser-Doppler flow (LDF) was measured in the ischemic border region where the reduction in LDF was less severe than in the core. LDF significantly increased from 48±18% of the pre-ischemic baseline to 67±21% (P<0.005). Thus, PNPH transfusion has a significant therapeutic window for protection from transient MCAO and may act, in part, by stabilizing vascular function and improving collateral blood flow.

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