Aquaporin-4 expression contributes to decreases in brain water content during mouse postnatal development

2013 ◽  
Vol 94 ◽  
pp. 49-55 ◽  
Author(s):  
Xiumiao Li ◽  
Junying Gao ◽  
Jiong Ding ◽  
Gang Hu ◽  
Ming Xiao
Keyword(s):  
Water Content ◽  
Postnatal Development ◽  
Aquaporin 4 ◽  
Brain Water Content ◽  
Brain Water

scholarly journals Neuroprotection of Sanhua Decoction against Focal Cerebral Ischemia/Reperfusion Injury in Rats through a Mechanism Targeting Aquaporin 4

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Lin Lu ◽  
Hui-qin Li ◽  
Ji-huang Li ◽  
Ai-ju Liu ◽  
Guo-qing Zheng
Keyword(s):  
Cerebral Ischemia ◽  
Water Content ◽  
Brain Edema ◽  
Focal Cerebral Ischemia ◽  
Ischemia Reperfusion ◽  
Aquaporin 4 ◽  
Brain Water Content ◽  
Aqp4 Expression ◽  
Cerebral Ischemia Reperfusion ◽  
Brain Water

Sanhua decoction (SHD) is a famous classic Chinese herbal prescription for ischemic stroke, and aquaporin 4 (AQP4) is reported to play a key role in ischemic brain edema. This study aimed to investigate neuroprotection of SHD against focal cerebral ischemia/reperfusion (I/R) injury in rats and explore the hypothesis that AQP4 probably is the target of SHD neuroprotection against I/R rats. Lentiviral-mediated AQP4-siRNA was inducted into adult male Sprague-Dawley rats via intracerebroventricular injection. The focal cerebral ischemia/reperfusion model was established by occluding middle cerebral artery. Neurological examinations were performed according to Longa Scale. Brain water content, was determined by wet and dry weight measurement. Western blot was adopted to test the AQP4 expression in ipsilateral hippocampus. After the treatment, SHD alleviated neurological deficits, reduced brain water content and downregulated the expression of AQP4 at different time points following I/R injury. Furthermore, neurobehavioral function and brain edema after I/R were significantly attenuated via downregulation of AQP4 expression when combined with AQP4-siRNA technology. In conclusion, SHD exerted neuroprotection against focal cerebral I/R injury in rats mainly through a mechanism targeting AQP4.

scholarly journals Ulinastatin alleviates traumatic brain injury by reducing endothelin-1

2020 ◽  
Vol 12 (1) ◽  
pp. 001-008
Author(s):  
Ting Liu ◽  
Xing-Zhi Liao ◽  
Mai-Tao Zhou
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Western Blot ◽  
Water Content ◽  
Brain Edema ◽  
Rat Model ◽  
Neurosurgical Procedures ◽  
Brain Water Content ◽  
The Brain ◽  
Brain Water

Abstract Background Brain edema is one of the major causes of fatality and disability associated with injury and neurosurgical procedures. The goal of this study was to evaluate the effect of ulinastatin (UTI), a protease inhibitor, on astrocytes in a rat model of traumatic brain injury (TBI). Methodology A rat model of TBI was established. Animals were randomly divided into 2 groups – one group was treated with normal saline and the second group was treated with UTI (50,000 U/kg). The brain water content and permeability of the blood–brain barrier were assessed in the two groups along with a sham group (no TBI). Expression of the glial fibrillary acidic protein, endthelin-1 (ET-1), vascular endothelial growth factor (VEGF), and matrix metalloproteinase 9 (MMP-9) were measured by immunohistochemistry and western blot. Effect of UTI on ERK and PI3K/AKT signaling pathways was measured by western blot. Results UTI significantly decreased the brain water content and extravasation of the Evans blue dye. This attenuation was associated with decreased activation of the astrocytes and ET-1. UTI treatment decreased ERK and Akt activation and inhibited the expression of pro-inflammatory VEGF and MMP-9. Conclusion UTI can alleviate brain edema resulting from TBI by inhibiting astrocyte activation and ET-1 production.

FGF10 Attenuates Experimental Traumatic Brain Injury through TLR4/MyD88/NF-κB Pathway

2021 ◽  
pp. 1-9
Author(s):  
Qinhan Hou ◽  
Hongmou Chen ◽  
Quan Liu ◽  
Xianlei Yan
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Protein Expression ◽  
Water Content ◽  
Neurological Deficit ◽  
Neuronal Apoptosis ◽  
Neuronal Damage ◽  
Intraventricular Injection ◽  
Brain Water Content ◽  
Brain Water

Traumatic brain injury (TBI) can induce neuronal apoptosis and neuroinflammation, resulting in substantial neuronal damage and behavioral disorders. Fibroblast growth factors (FGFs) have been shown to be critical mediators in tissue repair. However, the role of FGF10 in experimental TBI remains unknown. In this study, mice with TBI were established via weight-loss model and validated by increase of modified neurological severity scores (mNSS) and brain water content. Secondly, FGF10 levels were elevated in mice after TBI, whereas intraventricular injection of Ad-FGF10 decreased mNSS score and brain water content, indicating the remittance of neurological deficit and cerebral edema in TBI mice. In addition, neuronal damage could also be ameliorated by stereotactic injection of Ad-FGF10. Overexpression of FGF10 increased protein expression of Bcl-2, while it decreased Bax and cleaved caspase-3/PARP, and improved neuronal apoptosis in TBI mice. In addition, Ad-FGF10 relieved neuroinflammation induced by TBI and significantly reduced the level of interleukin 1β/6, tumor necrosis factor α, and monocyte chemoattractant protein-1. Moreover, Ad-FGF10 injection decreased the protein expression level of Toll-like receptor 4 (TLR4), MyD88, and phosphorylation of NF-κB (p-NF-κB), suggesting the inactivation of the TLR4/MyD88/NF-κB pathway. In conclusion, overexpression of FGF10 could ameliorate neurological deficit, neuronal apoptosis, and neuroinflammation through inhibition of the TLR4/MyD88/NF-κB pathway, providing a potential therapeutic strategy for brain injury in the future.

scholarly journals Quantitation of Photochemically Induced Focal Cerebral Ischemia in the Rat

1988 ◽  
Vol 8 (1) ◽  
pp. 89-95 ◽  
Author(s):  
John J. Grome ◽  
Gerlinde Gojowczyk ◽  
Wolfgang Hofmann ◽  
David I. Graham
Keyword(s):  
Cerebral Ischemia ◽  
Water Content ◽  
Rose Bengal ◽  
Tissue Damage ◽  
Focal Cerebral Ischemia ◽  
Ischemic Damage ◽  
Brain Water Content ◽  
Ischemic Insult ◽  
Ischemic Lesion ◽  
Brain Water

This study was carried out with a recently developed model of focal cerebral ischemia in the rat based on the photochemical induction of thrombotic stroke using the dye Rose Bengal. We examined the change in the volume of the lesion and brain water content, in separate groups of rats, at different times (1, 4, 24, 72, and 168 h) after the induction of the ischemic lesion. The volume of ischemic damage increased rapidly between 1 and 24 h after the ischemic insult and decreased between 24 and 168 h. The lesion at 168 h was significantly larger than that following 1 h of ischemia and similar to that obtained at 4 h, suggesting that the maximum extent of tissue damage (without the involvement of significant edema) was reached within the first 4 h in this model. The enlargement of the lesion after 4 h correlated closely with changes in brain water content.

scholarly journals Glucose Intolerance Induced by Oligemic Brain Hypoxia: The Effect of Terguride

1997 ◽  
Vol 40 (3) ◽  
pp. 57-60
Author(s):  
Věroslav Golda ◽  
Jiřina Hilgertová
Keyword(s):  
Glucose Tolerance ◽  
Water Content ◽  
Glucose Intolerance ◽  
Insulin Binding ◽  
Tolerance Test ◽  
Female Rats ◽  
Brain Water Content ◽  
Brain Hypoxia ◽  
Series Of Experiments ◽  
Brain Water

Two series of experiments were performed. In the first one experiments were carried out in Koletsky genetically hypertensive lean female rats and in the normotensive female rats of Wistar strain. Glucose intolerance was induced by oligemic brain hypoxia (4 hours of occlusion of both common carotid arteries followed by 44 hours reperfusion). Brain water content were used as a marker of brain edema.Changes in insulinemia and specific insulin binding were used as expression of regulative mechanisms participating in modification of glucose tolerance. The effect of terguride (trans-dihydro- lisuride) was tested.Brain hypoxia induced glucose intolerance in both strains of rat but brain edema was found only in the normotensive females. Both abnormalities were alleviated by terguride treatment. Basal glycaemia was not changed either by the brain hypoxia or by terguride treatment,except normoternsive female where brain hypoxia induced hyperglycaemia. The second series of experiments were carried out in the normotensive females. The arrangement of experiments was the same as in first series except omission of the final glucose tolerance test. Brain hypoxia causes increase in brain water content. The mentioned elevation of brain water content was alleviated by terguride treatmnet. Insulin binding to erythrocytes was not influenced by brain hypoxia. Terguride treatment shows decrease of insulin binding to erythrocytes. Brain hypoxia elevates insulinemia which was not alleviated by terguride treatment.

Abstract P790: Landiolol Attenuates Global Cerebral Edema Following Experimental Cardiac Arrest in Mice

Stroke ◽  
2021 ◽  
Vol 52 (Suppl_1) ◽  
Author(s):  
Tomoyuki Iwai ◽  
Shin Nakayama
Keyword(s):  
Cardiac Arrest ◽  
Water Content ◽  
Cerebral Edema ◽  
Ischemia Reperfusion ◽  
Control Group ◽  
P Value ◽  
Brain Water Content ◽  
Arterial Blood ◽  
The Brain ◽  
Brain Water

Introduction: Cerebral edema following cardiac arrest and cardiopulmonary resuscitation (CA/CPR) is associated with unfavorable neurologic outcome. The Na + -K + -2Cl - water cotransporter NKCC1 is suspected to be a critical mediator of edema formation after ischemia. It is reported that β1 adrenoreceptor antagonists protect neurons following brain ischemia in rodents. β1 adrenoreceptor antagonists inhibit the Na + -K + -ATPase, which can inhibit driving force of NKCC1 that theoretically reduces cerebral edema following ischemia-reperfusion injury. In this study, we examined whether landiolol, a selective β1 adrenoreceptor antagonist, attenuates cerebral edema following CA/CPR. Methods: Isoflurane-anesthetized adult male mice (C57BL/6J, 25-30g) were randomized into landiolol group or control group. After 7-min CA followed by CPR, landiolol (0.5ml, 830μg/ml) was administered by continuous infusion intravenously for 4 hours. Animals in control group were given normal saline (0.5ml) in the same manner. Twenty-four hours after CA/CPR, the brain was removed to assess brain water content using wet-to-dry method. The primary outcome was measurement of the brain water content. Heart rate and arterial blood pressure were recorded. Measured parameters were analyzed by one-way ANOVA with post hoc Tukey-Kramer test using SPSS® statistics 25. Differences were considered statistically significant at a P value < 0.05. Results: Brain water contents was increased in control group mice after CA/CPR (n=10) compared with those in sham operated mice (n=5) (79.5±0.85% vs 78.3±0.14%, P=0.003). Compared with control group, landiolol treatment significantly reduced brain water content in mice subjected to CA/CPR (n=12) (78.9±0.51% vs 79.5±0.85%, P=0.04). Conclusion: Landiolol attenuated brain edema following CA/CPR. These results may suggest selective β1-blocker could be alternative treatment for neuroprotection in patients who suffered CA/CPR.

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