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Abdennadher M, Jacobellis S, Václavů L, Juttukonda M, Inati S, Goldstein L, van Osch MJP, Rosen B, Hua N, Theodore W. Water exchange across the blood-brain barrier and epilepsy: Review on pathophysiology and neuroimaging. Epilepsia Open 2024; 9:1123-1135. [PMID: 38884502 PMCID: PMC11296120 DOI: 10.1002/epi4.12994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 04/30/2024] [Accepted: 05/23/2024] [Indexed: 06/18/2024] Open
Abstract
The blood-brain barrier (BBB) is a barrier protecting the brain and a milieu of continuous exchanges between blood and brain. There is emerging evidence that the BBB plays a major role in epileptogenesis and drug-resistant epilepsy, through several mechanisms, such as water homeostasis dysregulation, overexpression of drug transporters, and inflammation. Studies have shown abnormal water homeostasis in epileptic tissue and altered aquaporin-4 water channel expression in animal epilepsy models. This review focuses on abnormal water exchange in epilepsy and describes recent non-invasive MRI methods of quantifying water exchange. PLAIN LANGUAGE SUMMARY: Abnormal exchange between blood and brain contribute to seizures and epilepsy. The authors describe why correct water balance is necessary for healthy brain functioning and how it is impacted in epilepsy. This review also presents recent MRI methods to measure water exchange in human brain. These measures would improve our understanding of factors leading to seizures.
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Affiliation(s)
- Myriam Abdennadher
- Neurology Department, Boston Medical CenterBoston University Chobanian & Avedisian School of MedicineBostonMassachusettsUSA
| | - Sara Jacobellis
- Boston University Chobanian & Avedisian School of MedicineBostonMassachusettsUSA
| | - Lena Václavů
- C.J. Gorter MRI Center, Department of RadiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Meher Juttukonda
- Athinoula A. Martinos Center of Biomedical Imaging, Department of Radiology, Massachusetts General HospitalHarvard Medical SchoolBostonMassachusettsUSA
| | - Sara Inati
- National Institute of Neurological Disorders and Stroke, NIHBethesdaMarylandUSA
| | - Lee Goldstein
- Psychiatry and Neurology DepartmentBoston University Chobanian & Avedisian School of MedicineBostonMassachusettsUSA
| | - Matthias J. P. van Osch
- C.J. Gorter MRI Center, Department of RadiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Bruce Rosen
- Athinoula A. Martinos Center of Biomedical Imaging, Department of Radiology, Massachusetts General HospitalHarvard Medical SchoolBostonMassachusettsUSA
| | - Ning Hua
- Radiology Department, Boston Medical CenterBoston University Chobanian & Avedisian School of MedicineBostonMassachusettsUSA
| | - William Theodore
- National Institute of Neurological Disorders and Stroke, NIHBethesdaMarylandUSA
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Hong Y, Wei C, Fu M, Li X, Zhang H, Yao B. MCC950 alleviates seizure severity and angiogenesis by inhibiting NLRP3/ IL-1β signaling pathway-mediated pyroptosis in mouse model of epilepsy. Int Immunopharmacol 2024; 126:111236. [PMID: 38039716 DOI: 10.1016/j.intimp.2023.111236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 11/03/2023] [Accepted: 11/12/2023] [Indexed: 12/03/2023]
Abstract
Epilepsy is one of the most common serious chronic brain disorders, affecting up to 70 million people worldwide. Vascular disruption, including blood-brain barrier impairment and pathological angiogenesis, exacerbates its occurrence. However, its underlying mechanisms remain elusive. MCC950 is a specific small-molecule inhibitor that selectively blocks NLRP3 inflammatory vesicle activation across the blood-brain barrier, limits downstream IL-1β maturation and release, and exerts therapeutic effects across multiple diseases. In the present study, an epilepsy model was established by intraperitoneal administration of Kainic acid to adult male C57BL/6J wild-type mice. The results revealed that the epilepsy susceptibility of MCC950-treated mice was decreased, and neural damage following seizure episodes was reduced. In addition, immunofluorescence staining, RT-qPCR, and Western blot demonstrated that MCC950 inhibited the expression of the NLRP3 inflammasome and its related proteins in microglia, whereas microangiogenesis was found to be increased in the cerebral cortex and hippocampus of epileptic mice, and these effects could be reversed by MCC950. Furthermore, neurobehavioral impairment was observed in the epileptic mouse model, and MCC950 similarly alleviated the aforementioned pathological process. To the best of our knowledge, this is the first study to establish that pathological microangiogenesis is associated with NLRP3/IL-1β signaling pathway activation in a Kainic acid-induced epilepsy mouse model and that MCC950 administration attenuates the above-mentioned pathological changes and exerts neuroprotective effects. Therefore, MCC950 is a promising therapeutic agent for the treatment of epilepsy.
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Affiliation(s)
- Yongri Hong
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China
| | - Caichuan Wei
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China
| | - Miaoying Fu
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China
| | - Xinyang Li
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China
| | - Haiju Zhang
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China.
| | - Baozhen Yao
- Department of Pediatrics, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuchang District, Wuhan, 430060, Hubei, China.
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Broekaart DWM, Zimmer TS, Cohen ST, Tessers R, Anink JJ, de Vries HE, Gorter JA, Prades R, Aronica E, van Vliet EA. The Gelatinase Inhibitor ACT-03 Reduces Gliosis in the Rapid Kindling Rat Model of Epilepsy, and Attenuates Inflammation and Loss of Barrier Integrity In Vitro. Biomedicines 2022; 10:biomedicines10092117. [PMID: 36140216 PMCID: PMC9495904 DOI: 10.3390/biomedicines10092117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 08/12/2022] [Accepted: 08/20/2022] [Indexed: 11/25/2022] Open
Abstract
Matrix metalloproteinases (MMPs) are endopeptidases responsible for the cleavage of intra- and extracellular proteins. Several brain MMPs have been implicated in neurological disorders including epilepsy. We recently showed that the novel gelatinase inhibitor ACT-03 has disease-modifying effects in models of epilepsy. Here, we studied its effects on neuroinflammation and blood–brain barrier (BBB) integrity. Using the rapid kindling rat model of epilepsy, we examined whether ACT-03 affected astro- and microgliosis in the brain using immunohistochemistry. Cellular and molecular alterations were further studied in vitro using human fetal astrocyte and brain endothelial cell (hCMEC/D3) cultures, with a focus on neuroinflammatory markers as well as on barrier permeability using an endothelial and astrocyte co-culture model. We observed less astro- and microgliosis in the brains of kindled animals treated with ACT-03 compared to control vehicle-treated animals. In vitro, ACT-03 treatment attenuated stimulation-induced mRNA expression of several pro-inflammatory factors in human fetal astrocytes and brain endothelial cells, as well as a loss of barrier integrity in endothelial and astrocyte co-cultures. Since ACT-03 has disease-modifying effects in epilepsy models, possibly via limiting gliosis, inflammation, and barrier integrity loss, it is of interest to further evaluate its effects in a clinical trial.
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Affiliation(s)
- Diede W. M. Broekaart
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Till S. Zimmer
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Sophie T. Cohen
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Rianne Tessers
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Jasper J. Anink
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Helga E. de Vries
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, 1081 HV Amsterdam, The Netherlands
| | - Jan A. Gorter
- Swammerdam Institute for Life Sciences Center for Neuroscience, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Roger Prades
- Accure Therapeutics S.L., 08028 Barcelona, Spain
| | - Eleonora Aronica
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
- Stichting Epilepsie Instellingen Nederland (SEIN), 2103 SW Heemstede, The Netherlands
- Correspondence: (E.A.); (E.A.v.V.)
| | - Erwin A. van Vliet
- Amsterdam UMC, Location University of Amsterdam, Department of (Neuro)Pathology, Amsterdam Neuroscience, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
- Swammerdam Institute for Life Sciences Center for Neuroscience, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
- Correspondence: (E.A.); (E.A.v.V.)
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van Vliet EA, Marchi N. Neurovascular unit dysfunction as a mechanism of seizures and epilepsy during aging. Epilepsia 2022; 63:1297-1313. [PMID: 35218208 PMCID: PMC9321014 DOI: 10.1111/epi.17210] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 02/23/2022] [Accepted: 02/23/2022] [Indexed: 11/30/2022]
Abstract
The term neurovascular unit (NVU) describes the structural and functional liaison between specialized brain endothelium, glial and mural cells, and neurons. Within the NVU, the blood‐brain barrier (BBB) is the microvascular structure regulating neuronal physiology and immune cross‐talk, and its properties adapt to brain aging. Here, we analyze a research framework where NVU dysfunction, caused by acute insults or disease progression in the aging brain, represents a converging mechanism underlying late‐onset seizures or epilepsy and neurological or neurodegenerative sequelae. Furthermore, seizure activity may accelerate brain aging by sustaining regional NVU dysfunction, and a cerebrovascular pathology may link seizures to comorbidities. Next, we focus on NVU diagnostic approaches that could be tailored to seizure conditions in the elderly. We also examine the impending disease‐modifying strategies based on the restoration of the NVU and, more in general, the homeostatic control of anti‐ and pro‐inflammatory players. We conclude with an outlook on current pre‐clinical knowledge gaps and clinical challenges pertinent to seizure onset and conditions in an aging population.
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Affiliation(s)
- Erwin A van Vliet
- Amsterdam UMC, University of Amsterdam, dept. of (Neuro)pathology, Amsterdam, the Netherlands.,University of Amsterdam, Swammerdam Institute for Life Sciences, Center for Neuroscience, Amsterdam, the Netherlands
| | - Nicola Marchi
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics, University of Montpellier, CNRS, INSERM, Montpellier, France
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Huang WY, Lai YL, Liu KH, Lin S, Chen HY, Liang CH, Wu HM, Hsu KS. TNFα-mediated necroptosis in brain endothelial cells as a potential mechanism of increased seizure susceptibility in mice following systemic inflammation. J Neuroinflammation 2022; 19:29. [PMID: 35109859 PMCID: PMC8809013 DOI: 10.1186/s12974-022-02406-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 01/27/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Systemic inflammation is a potent contributor to increased seizure susceptibility. However, information regarding the effects of systemic inflammation on cerebral vascular integrity that influence neuron excitability is scarce. Necroptosis is closely associated with inflammation in various neurological diseases. In this study, necroptosis was hypothesized to be involved in the mechanism underlying sepsis-associated neuronal excitability in the cerebrovascular components (e.g., endothelia cells). METHODS Lipopolysaccharide (LPS) was used to induce systemic inflammation. Kainic acid intraperitoneal injection was used to measure the susceptibility of the mice to seizure. The pharmacological inhibitors C87 and GSK872 were used to block the signaling of TNFα receptors and necroptosis. In order to determine the features of the sepsis-associated response in the cerebral vasculature and CNS, brain tissues of mice were obtained for assays of the necroptosis-related protein expression, and for immunofluorescence staining to identify morphological changes in the endothelia and glia. In addition, microdialysis assay was used to assess the changes in extracellular potassium and glutamate levels in the brain. RESULTS Some noteworthy findings, such as increased seizure susceptibility and brain endothelial necroptosis, Kir4.1 dysfunction, and microglia activation were observed in mice following LPS injection. C87 treatment, a TNFα receptor inhibitor, showed considerable attenuation of increased kainic acid-induced seizure susceptibility, endothelial cell necroptosis, microglia activation and restoration of Kir4.1 protein expression in LPS-treated mice. Treatment with GSK872, a RIP3 inhibitor, such as C87, showed similar effects on these changes following LPS injection. CONCLUSIONS The findings of this study showed that TNFα-mediated necroptosis induced cerebrovascular endothelial damage, neuroinflammation and astrocyte Kir4.1 dysregulation, which may coalesce to contribute to the increased seizure susceptibility in LPS-treated mice. Pharmacologic inhibition targeting this necroptosis pathway may provide a promising therapeutic approach to the reduction of sepsis-associated brain endothelia cell injury, astrocyte ion channel dysfunction, and subsequent neuronal excitability.
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Affiliation(s)
- Wan-Yu Huang
- Institute of Basic Medical Sciences Basic Medicine, College of Medicine, National Cheng-Kung University, Tainan, Taiwan.,Pediatrics of Kung-Ten General Hospital, Taichung City, Taiwan
| | - Yen-Ling Lai
- Inflammation Research and Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Ko-Hung Liu
- Inflammation Research and Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Shankung Lin
- Inflammation Research and Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Hsuan-Ying Chen
- Inflammation Research and Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Chih-Hung Liang
- Department of Food Science, Tunghai University, Taichung City, Taiwan
| | - Hung-Ming Wu
- Inflammation Research and Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan. .,Department of Neurology, Changhua Christian Hospital, Changhua City, Taiwan. .,Institute of Acupuncture, School of Chinese Medicine, China Medical University, Taichung City, Taiwan.
| | - Kuei-Sen Hsu
- Institute of Basic Medical Sciences Basic Medicine, College of Medicine, National Cheng-Kung University, Tainan, Taiwan.
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Fishel Bartal M, Sibai BM. Eclampsia in the 21st century. Am J Obstet Gynecol 2022; 226:S1237-S1253. [PMID: 32980358 DOI: 10.1016/j.ajog.2020.09.037] [Citation(s) in RCA: 71] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 09/14/2020] [Accepted: 09/22/2020] [Indexed: 12/12/2022]
Abstract
The reported incidence of eclampsia is 1.6 to 10 per 10,000 deliveries in developed countries, whereas it is 50 to 151 per 10,000 deliveries in developing countries. In addition, low-resource countries have substantially higher rates of maternal and perinatal mortalities and morbidities. This disparity in incidence and pregnancy outcomes may be related to universal access to prenatal care, early detection of preeclampsia, timely delivery, and availability of healthcare resources in developed countries compared to developing countries. Because of its infrequency in developed countries, many obstetrical providers and maternity units have minimal to no experience in the acute management of eclampsia and its complications. Therefore, clear protocols for prevention of eclampsia in those with severe preeclampsia and acute treatment of eclamptic seizures at all levels of healthcare are required for better maternal and neonatal outcomes. Eclamptic seizure will occur in 2% of women with preeclampsia with severe features who are not receiving magnesium sulfate and in <0.6% in those receiving magnesium sulfate. The pathogenesis of an eclamptic seizure is not well understood; however, the blood-brain barrier disruption with the passage of fluid, ions, and plasma protein into the brain parenchyma remains the leading theory. New data suggest that blood-brain barrier permeability may increase by circulating factors found in preeclamptic women plasma, such as vascular endothelial growth factor and placental growth factor. The management of an eclamptic seizure will include supportive care to prevent serious maternal injury, magnesium sulfate for prevention of recurrent seizures, and promoting delivery. Although routine imagining following an eclamptic seizure is not recommended, the classic finding is referred to as the posterior reversible encephalopathy syndrome. Most patients with posterior reversible encephalopathy syndrome will show complete resolution of the imaging finding within 1 to 2 weeks, but routine imaging follow-up is unnecessary unless there are findings of intracranial hemorrhage, infraction, or ongoing neurologic deficit. Eclampsia is associated with increased risk of maternal mortality and morbidity, such as placental abruption, disseminated intravascular coagulation, pulmonary edema, aspiration pneumonia, cardiopulmonary arrest, and acute renal failure. Furthermore, a history of eclamptic seizures may be related to long-term cardiovascular risk and cognitive difficulties related to memory and concentration years after the index pregnancy. Finally, limited data suggest that placental growth factor levels in women with preeclampsia are superior to clinical markers in prediction of adverse pregnancy outcomes. This data may be extrapolated to the prediction of eclampsia in future studies. This summary of available evidence provides data and expert opinion on possible pathogenesis of eclampsia, imaging findings, differential diagnosis, and stepwise approach regarding the management of eclampsia before delivery and after delivery as well as current recommendations for the prevention of eclamptic seizures in women with preeclampsia.
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Affiliation(s)
- Michal Fishel Bartal
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX.
| | - Baha M Sibai
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX
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7
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Physiology of the cerebrovascular adaptation to pregnancy. HANDBOOK OF CLINICAL NEUROLOGY 2021. [PMID: 32736760 DOI: 10.1016/b978-0-444-64239-4.00004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
The adaptation of the cerebral circulation to pregnancy is unique compared with other organs and circulatory systems, because the brain requires relatively constant blood flow and water and solute composition to maintain homeostasis. Thus, a major adaptation of the maternal cerebrovasculature to pregnancy is to maintain normalcy in the face of expanded plasma volume, increased cardiac output, and high levels of permeability factors. In this chapter, the effect of pregnancy on critical functions of the cerebral circulation is discussed, including changes occurring at the endothelium and blood-brain barrier (BBB), which protect the maternal brain from changes in BBB permeability. Further, pregnancy-induced changes in the structure and function of cerebral arteries, arterioles, and veins will be discussed as they relate to cerebral vascular resistance, hemodynamics, and cerebral blood flow autoregulation.
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8
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Blood-brain barrier dysfunction as a potential therapeutic target for neurodegenerative disorders. Arch Pharm Res 2021; 44:487-498. [PMID: 34028650 DOI: 10.1007/s12272-021-01332-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/10/2021] [Indexed: 12/12/2022]
Abstract
The blood-brain barrier (BBB) is composed of specific tight junction proteins and transporters expressed on the lining of endothelial cells of the vasculature in the brain. The structural and functional integrity of the BBB is one of the most critical factors for maintaining brain homeostasis and is mainly regulated by complex interactions between various cell types, such as endothelial cells, pericytes, and astrocytes, which are shaped by their differential responses to changes in microenvironments. Alterations in these cellular components have been implicated in neurodegenerative disorders. Although it has long been considered that BBB dysfunction is a mere ramification of pathological phenomena, emerging evidence supports its critical role in the pathogenesis of various disorders. In epilepsy, heightened BBB permeability has been found to be associated with increased occurrence of spontaneous seizures. Additionally, exaggerated inflammatory responses significantly correlate with increased BBB permeability during healthy aging. Furthermore, it has been previously reported that BBB disruption can be an early marker for predicting cognitive impairment in the progression of Alzheimer's disease. We herein review a potential role of the major cellular components of the BBB, with a focus on the contribution of BBB disruption, in neurodegenerative disease progression.
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Metabolic Shifts as the Hallmark of Most Common Diseases: The Quest for the Underlying Unity. Int J Mol Sci 2021; 22:ijms22083972. [PMID: 33921428 PMCID: PMC8068795 DOI: 10.3390/ijms22083972] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 03/31/2021] [Accepted: 04/03/2021] [Indexed: 12/13/2022] Open
Abstract
A hyper-specialization characterizes modern medicine with the consequence of classifying the various diseases of the body into unrelated categories. Such a broad diversification of medicine goes in the opposite direction of physics, which eagerly looks for unification. We argue that unification should also apply to medicine. In accordance with the second principle of thermodynamics, the cell must release its entropy either in the form of heat (catabolism) or biomass (anabolism). There is a decreased flow of entropy outside the body due to an age-related reduction in mitochondrial entropy yield resulting in increased release of entropy in the form of biomass. This shift toward anabolism has been known in oncology as Warburg-effect. The shift toward anabolism has been reported in most diseases. This quest for a single framework is reinforced by the fact that inflammation (also called the immune response) is involved in nearly every disease. This strongly suggests that despite their apparent disparity, there is an underlying unity in the diseases. This also offers guidelines for the repurposing of old drugs.
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10
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Boux F, Forbes F, Collomb N, Zub E, Mazière L, de Bock F, Blaquiere M, Stupar V, Depaulis A, Marchi N, Barbier EL. Neurovascular multiparametric MRI defines epileptogenic and seizure propagation regions in experimental mesiotemporal lobe epilepsy. Epilepsia 2021; 62:1244-1255. [PMID: 33818790 DOI: 10.1111/epi.16886] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Improving the identification of the epileptogenic zone and associated seizure-spreading regions represents a significant challenge. Innovative brain-imaging modalities tracking neurovascular dynamics during seizures may provide new disease biomarkers. METHODS With use of a multi-parametric magnetic resonance imaging (MRI) analysis at 9.4 Tesla, we examined, elaborated, and combined multiple cellular and cerebrovascular MRI read-outs as imaging biomarkers of the epileptogenic and seizure-propagating regions. Analyses were performed in an experimental model of mesial temporal lobe epilepsy (MTLE) generated by unilateral intra-hippocampal injection of kainic acid (KA). RESULTS In the ipsilateral epileptogenic hippocampi, tissue T1 and blood-brain barrier (BBB) permeability to gadolinium were increased 48-72 hours post-KA, as compared to sham and contralateral hippocampi. BBB permeability endured during spontaneous focal seizures (4-6 weeks), along with a significant increase of apparent diffusion coefficient (ADC) and blood volume fraction (BVf). Simultaneously, ADC and BVf were augmented in the contralateral hippocampus, a region characterized by electroencephalographic seizure spreading, discrete histological neurovascular cell modifications, and no tissue sclerosis. We next asked whether combining all the acquired MRI parameters could deliver criteria to classify the epileptogenic from the seizure-spreading and sham hippocampi in these experimental conditions and over time. To differentiate sham from epileptogenic areas, the automatic multi-parametric classification provided a maximum accuracy of 97.5% (32 regions) 48-72 hours post-KA and of 100% (60 regions) at spontaneous seizures stage. To differentiate sham, epileptogenic, and seizure-spreading areas, the accuracies of the automatic classification were 93.1% (42 regions) 48-72 hours post-KA and 95% (80 regions) at spontaneous seizure stage. SIGNIFICANCE Combining multi-parametric MRI acquisition and machine-learning analyses delivers specific imaging identifiers to segregate the epileptogenic from the contralateral seizure-spreading hippocampi in experimental MTLE. The potential clinical value of our findings is critically discussed.
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Affiliation(s)
- Fabien Boux
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France.,Inria, CNRS, G-INP, University of Grenoble Alpes, Grenoble, France
| | - Florence Forbes
- Inria, CNRS, G-INP, University of Grenoble Alpes, Grenoble, France
| | - Nora Collomb
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Emma Zub
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Lucile Mazière
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Fréderic de Bock
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Marine Blaquiere
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Vasile Stupar
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Antoine Depaulis
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Nicola Marchi
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Emmanuel L Barbier
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
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Sarahian N, Mohammadi MT, Darabi S, Faghihi N. Fenofibrate protects the neurovascular unit and ameliorates plasma corticosterone levels in pentylenetetrazole-induced kindling seizure in mice. Brain Res 2021; 1758:147343. [PMID: 33556377 DOI: 10.1016/j.brainres.2021.147343] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 01/03/2021] [Accepted: 01/31/2021] [Indexed: 02/07/2023]
Abstract
Epileptic seizures are the most common neurological diseases that change the function of neurovascular unit at molecular levels accompanied by activation of a wide variety of neurodegenerative cascades. Based on the pleiotropic functions of peroxisome proliferator-activated receptor-alpha (PPARα), the current study evaluated the neuroprotective effects of fenofibrate (an effective PPARα agonist) on the brain injuries induced by pentylenetetrazole (PTZ)-induced kindling seizure. Adult male NMRI mice were randomly assigned into four groups (n = 14) as follows; control, untreated kindled mice (PTZ) and two fenofibrate-treated kindled groups. Repeated intraperitoneal injections of PTZ (45 mg/kg) were used to develop kindling seizure every 48 h for 21 days. Treated mice were administered orally fenofibrate at doses of 30 and 50 mg/kg/day during the study. Plasma corticosterone and brain levels of brain-derived neurotrophic factor (BDNF), malondialdehyde (MDA) and mRNA transcription of p53, as well as blood-brain barrier (BBB) permeability, were determined at termination of the study. Fenofibrate considerably improved seizure latency and anxiety-like behaviors in treated kindled mice. Fenofibrate at doses of 30 and 50 mg/kg significantly (P < 0.001) decreased plasma corticosterone (56.88 ± 0.80 and 54.81 ± 0.29 ng/mL, respectively) compared to PTZ group (74.96 ± 1.60 ng/mL). It also significantly (P < 0.05) decreased BDNF levels in both treatment groups (8.13 ± 0.14 and 8.74 ± 0.09 ng/mL, respectively) compared to PTZ group (9.68 ± 0.20 ng/mL). Fenofibrate particularly at higher dose significantly (P < 0.01) decreased MDA content and mRNA expression levels of p53 in treated kindled mice by 67% and 28%, respectively, compared to PTZ group. Similarly, 50 mg/kg fenofibrate significantly (P < 0.05) decreased Evans blue extravasation into brain in treated kindled mice (8.72 ± 0.96 µg/g) compared to PTZ group (15.31 ± 2.18 µg/g). Our results revealed the anticonvulsive and neuroprotective effects of fenofibrate in PTZ-induced kindling seizure in mice. Fenofibrate also improved the neurovascular functions at molecular levels in kindling seizure that might be associated with ameliorating the seizure behaviors.
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Affiliation(s)
- Nahid Sarahian
- Student Research Committee, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mohammad Taghi Mohammadi
- Student Research Committee, Baqiyatallah University of Medical Sciences, Tehran, Iran; Department of Physiology and Medical Physics, Faculty of Medicine, Baqiyatallah University of Medical Sciences, Tehran, Iran; Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
| | - Shamsi Darabi
- Department of Physiology, Faculty of Medicine, Qom University of Medical Sciences, Qom, Iran
| | - Nastaran Faghihi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
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12
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Janigro D, Bailey DM, Lehmann S, Badaut J, O'Flynn R, Hirtz C, Marchi N. Peripheral Blood and Salivary Biomarkers of Blood-Brain Barrier Permeability and Neuronal Damage: Clinical and Applied Concepts. Front Neurol 2021; 11:577312. [PMID: 33613412 PMCID: PMC7890078 DOI: 10.3389/fneur.2020.577312] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 12/01/2020] [Indexed: 12/12/2022] Open
Abstract
Within the neurovascular unit (NVU), the blood–brain barrier (BBB) operates as a key cerebrovascular interface, dynamically insulating the brain parenchyma from peripheral blood and compartments. Increased BBB permeability is clinically relevant for at least two reasons: it actively participates to the etiology of central nervous system (CNS) diseases, and it enables the diagnosis of neurological disorders based on the detection of CNS molecules in peripheral body fluids. In pathological conditions, a suite of glial, neuronal, and pericyte biomarkers can exit the brain reaching the peripheral blood and, after a process of filtration, may also appear in saliva or urine according to varying temporal trajectories. Here, we specifically examine the evidence in favor of or against the use of protein biomarkers of NVU damage and BBB permeability in traumatic head injury, including sport (sub)concussive impacts, seizure disorders, and neurodegenerative processes such as Alzheimer's disease. We further extend this analysis by focusing on the correlates of human extreme physiology applied to the NVU and its biomarkers. To this end, we report NVU changes after prolonged exercise, freediving, and gravitational stress, focusing on the presence of peripheral biomarkers in these conditions. The development of a biomarker toolkit will enable minimally invasive routines for the assessment of brain health in a broad spectrum of clinical, emergency, and sport settings.
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Affiliation(s)
- Damir Janigro
- Department of Physiology Case Western Reserve University, Cleveland, OH, United States.,FloTBI Inc., Cleveland, OH, United States
| | - Damian M Bailey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, United Kingdom
| | - Sylvain Lehmann
- IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France
| | - Jerome Badaut
- Brain Molecular Imaging Lab, CNRS UMR 5287, INCIA, University of Bordeaux, Bordeaux, France
| | - Robin O'Flynn
- IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France
| | - Christophe Hirtz
- IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France
| | - Nicola Marchi
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (UMR 5203 CNRS-U 1191 INSERM, University of Montpellier), Montpellier, France
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13
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Chmielewska N, Maciejak P, Osuch B, Kursa MB, Szyndler J. Pro-inflammatory cytokines, but not brain- and extracellular matrix-derived proteins, are increased in the plasma following electrically induced kindling of seizures. Pharmacol Rep 2020; 73:506-515. [PMID: 33377994 PMCID: PMC7994222 DOI: 10.1007/s43440-020-00208-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 11/13/2020] [Accepted: 12/07/2020] [Indexed: 12/16/2022]
Abstract
Background The aim of the study was to evaluate the brain-derived proteins, extracellular matrix-derived protein and cytokines as potential peripheral biomarkers of different susceptibility to seizure development in an animal model of epilepsy evoked by chronic focal electrical stimulation of the brain. Methods The plasma levels of IL-1β (interleukin 1β), IL-6 (interleukin 6), UCH-L1 (ubiquitin C-terminal hydrolase 1), MMP-9 (matrix metalloproteinase 9), and GFAP (glial fibrillary acidic protein) were assessed. The peripheral concentrations of the selected proteins were analyzed according to the status of kindling and seizure severity parameters. In our study, increased concentrations of plasma IL-1β and IL-6 were observed in rats subjected to hippocampal kindling compared to sham-operated rats. Results Animals that developed tonic–clonic seizures after the last stimulation had higher plasma concentrations of IL-1β and IL-6 than sham-operated rats and rats that did not develop seizure. Elevated levels of IL-1β and IL-6 were observed in rats that presented more severe seizures after the last five stimulations compared to sham-operated animals. A correlation between plasma IL-1β and IL-6 concentrations was also found. On the other hand, the plasma levels of the brain-derived proteins UCH-L1, MMP-9, and GFAP were unaffected by kindling status and seizure severity parameters. Conclusions The plasma concentrations of IL-1β and IL-6 may have potential utility as peripheral biomarkers of immune system activation in the course of epilepsy and translational potential for future clinical use. Surprisingly, markers of cell and nerve ending damage (GFAP, UCH-L1 and MMP-9) may have limited utility.
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Affiliation(s)
- Natalia Chmielewska
- Department of Neurochemistry, Institute of Psychiatry and Neurology, Sobieskiego Street 9, 02-957, Warsaw, Poland.
| | - Piotr Maciejak
- Department of Neurochemistry, Institute of Psychiatry and Neurology, Sobieskiego Street 9, 02-957, Warsaw, Poland
| | - Bartosz Osuch
- Department of Neurochemistry, Institute of Psychiatry and Neurology, Sobieskiego Street 9, 02-957, Warsaw, Poland
| | - Miron B Kursa
- Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, Pawinskiego Street 5A, 02-106, Warsaw, Poland
| | - Janusz Szyndler
- Department of Experimental and Clinical Pharmacology, Centre for Preclinical Research and Technology CePT, Medical University of Warsaw, Banacha Street 1B, 02-097, Warsaw, Poland
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14
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Zeyghami MA, Hesam E, Khadivar P, Hesam HK, Ahmadnia A, Amini A. Effects of atorvastatin and metformin on development of pentylenetetrazole-induced seizure in mice. Heliyon 2020; 6:e03761. [PMID: 32382676 PMCID: PMC7203078 DOI: 10.1016/j.heliyon.2020.e03761] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/21/2019] [Accepted: 04/06/2020] [Indexed: 12/18/2022] Open
Abstract
Recent studies have shown that statins and Metformin may have beneficial effects on seizure through different mechanisms. In the current study, we investigated whether Metformin, Atorvastatin, and concomitant uses of them have beneficial effects on pentylenetetrazole (PTZ)-induced kindling. Adult male C57BL/6 mice were randomly divided into four experimental groups with seven mice in each group. Group 1, control group; group 2, received Metformin (200 mg/kg, i.p); group 3, received Atorvastatin (10 mg/kg, i.p.); group 4, received Atorvastatin (10 mg/kg, i.p.) plus Metformin (200 mg/kg, i.p.). Twenty minutes after injection of the mentioned drugs, the experimented mice received 37/5 mg/kg of PTZ intraperitoneally on alternating days. Then the convulsive behavior signs were evaluated for 20 min after each PTZ injection. There were significant differences in the stage 2 latency parameter among group 2 (p = 0.033, F = 8.46)/group 3 (p = 0.032, F = 10.42)/group 4 (p = 0.008, F = 24.57) as compared to the control group, while no significant differences were found comparing only group 2,3, and 4 with eachother excluding the control group. Pretreatment with Atorvastatin (p = 0.002, F = 33), Atorvastatin + Metformin (p = 0.006, F = 20.77), and Metformin alone increased stage 5 latency as compared to the PTZ group, significantly. Also, our results have shown that pretreatment with Atorvastatin (p = 0.013, F = 14.48), Metformin (p = 0.015, F = 16.67), and concomitant usage of them significantly decreased stage 5 duration as compared to the control group. Our findings clearly demonstrate that concomitant use of Metformin and Atorvastatin has no more protective effect against the development of kindling as compare to these drugs alone. Thus, we concluded that, these drugs may inhibit kindling via a similar mechanism and we suggested that it is probably through regulation of autophagy.
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Affiliation(s)
- Mohammad Ali Zeyghami
- Neuroscience Research Center, Golestan University of Medical Sciences, Gorgan, Iran.,Dept. Pharmacology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Ebrahim Hesam
- Neuroscience Research Center, Golestan University of Medical Sciences, Gorgan, Iran.,Dept. Physiology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Parand Khadivar
- Dept. Medical Biotechnology, Faculty of Advanced Technologies in Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Halimeh Khaton Hesam
- Neuroscience Research Center, Golestan University of Medical Sciences, Gorgan, Iran
| | - Ali Ahmadnia
- Dept. Molecular Medicine, Faculty of Advanced Technologies in Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Abolfazl Amini
- Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, Iran
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15
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Ostroumova TM, Ostroumova OD, Akimova ES, Kochetkov AI. [Drug-induced seizures: prevalence, risk factors, treatment and prevention]. Zh Nevrol Psikhiatr Im S S Korsakova 2020; 119:86-97. [PMID: 31851178 DOI: 10.17116/jnevro201911911186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
There is a growing interest to the problem of drug-induced epileptic seizures (ES) due to their relatively high prevalence, poor prognosis, a large number of different drugs associated with the development of drug-induced ES, and low awareness among general practitioners. Drug-induced ES are most often associated with the use of antidepressants, antipsychotics, antiepileptic drugs (overdose or as a result of discontinuation), antibiotics, immunosuppressants and immunomodulators, antitumor agents, analgesics, central nervous system stimulators, anesthetics etc. The prevalence of drug-induced ES varies with different drugs. It is estimated that about 6.1% of the first occurring ES are drug-induced. Risk factors for drug-induced ES include a history of epilepsy or ES, cancer, blood-brain barrier dysfunction, several concomitant neurological diseases, mental disorders, childhood, old and very old age, fever, impaired liver metabolism in patients with liver diseases, impaired drug excretion in patients with kidney diseases, polypharmacy, pharmacokinetic properties of the drugs themselves, allowing them to penetrate the blood-brain barrier in the central nervous system (lipophilicity, transport and communication with blood plasma proteins), drug concentration in blood serum, method and frequency of drug administration, single and daily doses of drugs. No clinical guidelines for the management of patients with drug-induced ES are available. It is recommended to identify patients at risk: elderly patients, patients with impaired liver and kidney function and patients receiving drugs that can cause ES and/or lower the seizure threshold. Benzodiazepines are the first-line treatment in drug-induced status epilepticus, barbiturates and propofol are the second-line treatment. The general principles for the prevention of drug-induced ES include careful selection of the optimal dose of drugs that can cause ES, especially in patients with impaired liver and/or kidney function, monitoring of several parameters in blood serum (for example, liver enzymes, electrolytes, glucose etc.), monitoring of the blood plasma concentration of certain drugs, avoiding the simultaneous administration of several drugs that stimulate the central nervous system, and a rapid discontinuation of such drugs.
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Affiliation(s)
- T M Ostroumova
- Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow,Russia
| | - O D Ostroumova
- Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow,Russia; Pirogov Russian National Research Medical University' Russian Clinical and Research Center of Gerontology, Moscow, Russia
| | - E S Akimova
- Yevdokimov Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - A I Kochetkov
- Pirogov Russian National Research Medical University' Russian Clinical and Research Center of Gerontology, Moscow, Russia
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16
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Baruah J, Vasudevan A, Köhling R. Vascular Integrity and Signaling Determining Brain Development, Network Excitability, and Epileptogenesis. Front Physiol 2020; 10:1583. [PMID: 32038280 PMCID: PMC6987412 DOI: 10.3389/fphys.2019.01583] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 12/17/2019] [Indexed: 01/27/2023] Open
Abstract
Our understanding of the etiological mechanisms leading up to epilepsy has undergone radical changes over time due to more insights into the complexity of the disease. The traditional hypothesis emphasized network hyperexcitability and an imbalance of inhibition and excitation, eventually leading to seizures. In this context, the contribution of the vascular system, and particularly the interactions between blood vessels and neuronal tissue, came into focus only recently. Thus, one highly exciting causative or contributing factor of epileptogenesis is the disruption of the blood-brain barrier (BBB) in the context of not only posttraumatic epilepsy, but also other etiologies. This hypothesis is now recognized as a synergistic mechanism that can give rise to epilepsy, and BBB repair for restoration of cerebrovascular integrity is considered a therapeutic alternative. Endothelial cells lining the inner surface of blood vessels are an integral component of the BBB system. Sealed by tight junctions, they are crucial in maintaining homeostatic activities of the brain, as well as acting as an interface in the neurovascular unit. Additional potential vascular mechanisms such as inflammation, altered neurovascular coupling, or changes in blood flow that can modulate neuronal circuit activity have been implicated in epilepsy. Our own work has shown how intrinsic defects within endothelial cells from the earliest developmental time points, which preclude neuronal changes, can lead to vascular abnormalities and autonomously support the development of hyperexcitability and epileptiform activity. In this article, we review the importance of vascular integrity and signaling for network excitability and epilepsy by highlighting complementary basic and clinical research studies and by outlining possible novel therapeutic strategies.
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Affiliation(s)
- Jugajyoti Baruah
- Department of Psychiatry, Harvard Medical School, Boston, MA, United States.,Angiogenesis and Brain Development Laboratory, Division of Basic Neuroscience, McLean Hospital, Belmont, MA, United States
| | - Anju Vasudevan
- Department of Psychiatry, Harvard Medical School, Boston, MA, United States.,Angiogenesis and Brain Development Laboratory, Division of Basic Neuroscience, McLean Hospital, Belmont, MA, United States
| | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
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17
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Abstract
OBJECTIVES To pool prevalence of nonconvulsive seizure, nonconvulsive status epilepticus, and epileptiform activity detected by different electroencephalography types in critically ills and to compare detection rates among them. DATA SOURCES MEDLINE (via PubMed) and SCOPUS (via Scopus) STUDY SELECTION:: Any type of study was eligible if studies were done in adult critically ill, applied any type of electroencephalography, and reported seizure rates. Case reports and case series were excluded. DATA EXTRACTION Data were extracted independently by two investigators. Separated pooling of prevalence of nonconvulsive seizure/nonconvulsive status epilepticus/epileptiform activity and odds ratio of detecting outcomes among different types of electroencephalography was performed using random-effect models. This meta-analysis followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and also adhered to the Meta-analyses Of Observational Studies in Epidemiology guidelines. Quality of evidence was assessed with the Newcastle-Ottawa Quality Assessment Scale for observational studies and Cochrane methods for randomized controlled trial studies. DATA SYNTHESIS A total of 78 (16,707 patients) and eight studies (4,894 patients) were eligible for pooling prevalence and odds ratios. For patients with mixed cause of admission, the pooled prevalence of nonconvulsive seizure, nonconvulsive status epilepticus, either nonconvulsive seizure or nonconvulsive status epilepticus detected by routine electroencephalography was 3.1%, 6.2%, and 6.3%, respectively. The corresponding prevalence detected by continuous electroencephalography monitoring was 17.9%, 9.1%, and 15.6%, respectively. In addition, the corresponding prevalence was high in post convulsive status epilepticus (33.5%, 20.2%, and 32.9%), CNS infection (23.9%, 18.1%, and 23.9%), and post cardiac arrest (20.0%, 17.3%, and 22.6%). The pooled conditional log odds ratios of nonconvulsive seizure/nonconvulsive status epilepticus detected by continuous electroencephalography versus routine electroencephalography from studies with paired data 2.57 (95% CI, 1.11-5.96) and pooled odds ratios from studies with independent data was 1.57 (95% CI, 1.00-2.47). CONCLUSIONS Prevalence of seizures detected by continuous electroencephalography was significantly higher than with routine electroencephalography. Prevalence was particularly high in post convulsive status epilepticus, CNS infection, and post cardiac arrest.
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18
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H S N, Paudel YN, K L K. Envisioning the neuroprotective effect of Metformin in experimental epilepsy: A portrait of molecular crosstalk. Life Sci 2019; 233:116686. [PMID: 31348946 DOI: 10.1016/j.lfs.2019.116686] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 07/17/2019] [Accepted: 07/22/2019] [Indexed: 12/14/2022]
Abstract
Epilepsy is a neurological disorder characterized by an enduring predisposition to generate and aggravate epileptic seizures affecting around 1% of global population making it a serious health concern. Despite the recent advances in epilepsy research, no disease-modifying treatment able to terminate epileptogenesis have been reported yet reflecting the complexity in understanding the disease pathogenesis. To overcome the current treatment gap against epilepsy, one effective approach is to explore anti-epileptic effects from a drug that are approved to treat non-epileptic diseases. In this regard, Metformin emerged as an ideal candidate which is a first line treatment option for type 2 diabetes mellitus (T2DM), has conferred neuroprotection in several in vivo neurological disorders such as Alzheimer's diseases (AD), Parkinson's disease (PD), Stroke, Huntington's diseases (HD) including epilepsy. In addition, Metformin has ameliorated cognitive alteration, learning and memory induced by epilepsy as well as in animal model of AD. Herein, we review the promising findings demonstrated upon Metformin treatment against animal model of epilepsy however, the precise underlying mechanism of anti-epileptic potential of Metformin is not well understood. However, there is a growing understanding that Metformin demonstrates its anti-epileptic effect mainly via ameliorating brain oxidative damage, activation of AMPK, inhibition of mTOR pathway, downregulation of α-synuclein, reducing apoptosis, downregulation of BDNF and TrkB level. These reflects that Metformin being non-anti-epileptic drug (AED) has a potential to ameliorate the cellular pathways that were impaired in epilepsy reflecting its therapeutical potential against epileptic seizure that might plausibly overcome the limitations of today epilepsy treatment.
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Affiliation(s)
- Nandini H S
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagara, Mysuru 570015, Karnataka, India
| | - Yam Nath Paudel
- Neuropharmacology Research Laboratory, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia.
| | - Krishna K L
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagara, Mysuru 570015, Karnataka, India.
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19
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Changes in the structure and function of the brain years after Pre-eclampsia. Ageing Res Rev 2018; 47:49-54. [PMID: 30026172 DOI: 10.1016/j.arr.2018.06.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 06/02/2018] [Accepted: 06/29/2018] [Indexed: 11/23/2022]
Abstract
Pre-eclampsia (PE) is a pregnancy specific syndrome that affects multiple organs including the brain. PE resolves after delivery of the placenta. Nonetheless, PE is a predisposing factor for cardiovascular disorders and hypertension later in life. These conditions are associated with a cognitive decline and dementia later in life. Studies have suggested that there may be long term pathological changes within the brain of the woman after PE/eclampsia and PE may be a risk marker for early cerebrovascular impairment. The aim of this review is to provide an insight into the possible long-term effect of PE and eclampsia on the brain structure and function with the probability of PE being a risk factor for neurodegenerative development. Long term effects of PE include cognitive impairment such as memory loss, attention deficit and motor speed impairment. Also, the pathology of the brain seems to be much affected later in life in women with history of PE/eclampsia. Certain changes in the structure and function of the brain observed among women with history of PE/eclampsia are similar to neurological disease like Alzheimer's disease (AD) and dementia.
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20
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Toffa DH, Kpadonou C, Gams Massi D, Ouedraogo M, Sow AD, Ndiaye M, Samb A. Le magnésium et le calcium réduisent la sévérité des troubles de la mémoire spatiale pour le modèle kaïnique d’épilepsie mésiale temporale chez la souris. Can J Physiol Pharmacol 2018; 96:1132-1144. [DOI: 10.1139/cjpp-2018-0020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Dènahin Hinnoutondji Toffa
- Neurologie, Centre Hospitalier de l’Université de Montréal, Montréal, QC H2X 0C1, Canada
- Neuroépilepsie, Centre de recherche du Centre Hospitalier de l’Université de Montréal, Montréal, QC H2X 0A9, Canada
- Laboratoire de physiologie et physiopathologie humaines, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Carl Kpadonou
- Laboratoire de physiologie et physiopathologie humaines, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Daniel Gams Massi
- Neurologie, Université de Douala - Faculté de Médecine et de Sciences Pharmaceutiques, Douala, Cameroun
- Neurologie, Centre Hospitalo-Universitaire National Fann, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Modeste Ouedraogo
- Laboratoire de physiologie et physiopathologie humaines, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Adjaratou Dieynabou Sow
- Neurologie, Centre Hospitalo-Universitaire National Fann, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Moustapha Ndiaye
- Neurologie, Centre Hospitalo-Universitaire National Fann, Université Cheikh Anta Diop, Dakar, Sénégal
| | - Abdoulaye Samb
- Laboratoire de physiologie et physiopathologie humaines, Université Cheikh Anta Diop, Dakar, Sénégal
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Matrix Metalloproteinase-Mediated Blood-Brain Barrier Dysfunction in Epilepsy. J Neurosci 2018; 38:4301-4315. [PMID: 29632167 DOI: 10.1523/jneurosci.2751-17.2018] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 03/12/2018] [Accepted: 03/21/2018] [Indexed: 01/08/2023] Open
Abstract
The blood-brain barrier is dysfunctional in epilepsy, thereby contributing to seizure genesis and resistance to antiseizure drugs. Previously, several groups reported that seizures increase brain glutamate levels, which leads to barrier dysfunction. One critical component of barrier dysfunction is brain capillary leakage. Based on our preliminary data, we hypothesized that glutamate released during seizures mediates an increase in matrix-metalloproteinase (MMP) expression and activity levels, thereby contributing to barrier leakage. To test this hypothesis, we exposed isolated brain capillaries from male Sprague Dawley rats to glutamate ex vivo and used an in vivo/ex vivo approach of isolated brain capillaries from female Wistar rats that experienced status epilepticus as an acute seizure model. We found that exposing isolated rat brain capillaries to glutamate increased MMP-2 and MMP-9 protein and activity levels, and decreased tight junction protein levels, which resulted in barrier leakage. We confirmed these findings in vivo in rats after status epilepticus and in brain capillaries from male mice lacking cytosolic phospholipase A2 Together, our data support the hypothesis that glutamate released during seizures signals an increase in MMP-2 and MMP-9 protein expression and activity levels, resulting in blood-brain barrier leakage.SIGNIFICANCE STATEMENT The mechanism leading to seizure-mediated blood-brain barrier dysfunction in epilepsy is poorly understood. In the present study, we focused on defining this mechanism in the brain capillary endothelium. We demonstrate that seizures trigger a pathway that involves glutamate signaling through cytosolic phospholipase A2, which increases MMP levels and decreases tight junction protein expression levels, resulting in barrier leakage. These findings may provide potential therapeutic avenues within the blood-brain barrier to limit barrier dysfunction in epilepsy and decrease seizure burden.
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22
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Johnson AC, Hammer ES, Sakkaki S, Tremble SM, Holmes GL, Cipolla MJ. Inhibition of blood-brain barrier efflux transporters promotes seizure in pregnant rats: Role of circulating factors. Brain Behav Immun 2018; 67:13-23. [PMID: 28739514 PMCID: PMC5696046 DOI: 10.1016/j.bbi.2017.07.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/18/2017] [Accepted: 07/20/2017] [Indexed: 11/17/2022] Open
Abstract
Seizure-provoking factors circulate late in gestation during normal pregnancy, but do not readily gain access to the brain due to the protective nature of the blood-brain barrier. In particular, efflux transporters are powerful ATP-driven pumps that actively prevent unwanted compounds from entering the brain. We hypothesized that acute inhibition of efflux transporters at the blood-brain barrier would result in spontaneous seizures in pregnant rats. We further hypothesized that the blood-brain barrier protects the maternal brain from seizure by increasing expression and/or activity of p-glycoprotein (P-gp), a major efflux transporter. Main blood-brain barrier efflux transporters were inhibited in-vivo in nonpregnant (Nonpreg) and pregnant (Preg; d19) Sprague Dawley rats (n=8/group). Seizures were monitored in conscious animals for 8h via chronically implanted electroencephalography (EEG) electrodes in the hippocampus and motor cortex and time-synced video. P-gp activity was measured via a calcein accumulation assay in freshly isolated cortical and hippocampal capillaries from Preg (d20) and Nonpreg rats (n=8-16/group), to assess regional susceptibility to transporter inhibition. P-gp expression, capillary density, and microglial activation as a measure of neuroinflammation were quantified using immunohistochemistry (n=4-6/group). Efflux transporter inhibition elicited hippocampal seizures within 1h in 100% of Preg rats that was not associated with neuroinflammation or elevated tumor necrosis factor alpha (TNFα) or vascular endothelial growth factor (VEGF), but negatively correlated with levels of estradiol. Hippocampal seizures were considerably less prevalent in Nonpreg rats. However, behavioral seizures in the motor cortex developed of similar severity in both groups of rats, demonstrating regional heterogeneity in response to efflux transporter inhibition. Basal P-gp activity was similar between groups, however, exposure to serum from Preg rats significantly decreased P-gp activity in the hippocampus, but not cortex, compared to serum from Nonpreg rats (0.29±0.1units/s in Preg vs. 0.06±0.02units/s in Nonpreg rats; p<0.05) that was not associated with elevated TNFα or VEGF. Thus, pregnancy differentially increased the susceptibility of the hippocampus to seizures in response to blood-brain barrier efflux transporter inhibition that may be due to the inhibitory effect of circulating factors in pregnancy on P-gp activity in the hippocampus.
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Affiliation(s)
- Abbie C Johnson
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
| | - Erica S Hammer
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
| | - Sophie Sakkaki
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
| | - Sarah M Tremble
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
| | - Gregory L Holmes
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
| | - Marilyn J Cipolla
- Department of Neurological Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA; Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA; Department of Pharmacology, University of Vermont Larner College of Medicine, Burlington, VT 05405, USA.
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Zhu Y, Chen P, Wan H, Wang Y, Hao P, Liu Y, Liu J. Selenium-Chromium(VI) Interaction Regulates the Contents and Correlations of Trace Elements in Chicken Brain and Serum. Biol Trace Elem Res 2018; 181:154-163. [PMID: 28493199 DOI: 10.1007/s12011-017-1038-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Accepted: 04/24/2017] [Indexed: 12/24/2022]
Abstract
This study aims to investigate the contents of trace elements in the brain and serum of male chickens and the effect of selenium-chromium(VI) interaction. A chronic experimental model was established by supplementing 22.14 mg/kg K2Cr2O7 with 0.00, 0.31, 0.63, 1.25, 2.50, and 5.00 mg/kg Na2SeO3 mg/kg B.W. to water for chicken daily. After 14, 28, and 42 days of exposure to the solution, the brain and serum of chickens from each group were collected to detect the levels of Ca, Cu, Mn, Fe, Zn, and Mg by inductively coupled plasma mass spectrometer (ICP-MS). Cr(VI) time-dependently accumulated in the brain and serum. The contents of Cr increased both in the brain and serum with prolonged exposure. Cr contents in the brain and serum decreased in all Se groups compared with those in only Cr-treated groups. Ca contents decreased with prolonged exposure and increasing Se dosage. The contents of Cu and Mn increased on the 28th day but decreased on the 42nd day in the brain and serum. Fe and Zn contents decreased in the serum under prolonged exposure and increased on the 28th day but decreased on the 42nd day in the brain. Cr exposure did not significantly affect Mg contents in the brain but slightly decreased those in the serum. Therefore, appropriate doses of Se affected Cr accumulation, leading to adjustments in the contents and correlations of trace elements.
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Affiliation(s)
- Yiran Zhu
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China
| | - Peng Chen
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China
| | - Huiyu Wan
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China
| | - Yang Wang
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China
| | - Pan Hao
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China
| | - Yongxia Liu
- Research Center for Animal Disease Control Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
| | - Jianzhu Liu
- College of Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, 271018, China.
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Cerebrospinal fluid findings in non-infectious status epilepticus. Epilepsy Res 2017; 140:61-65. [PMID: 29276970 DOI: 10.1016/j.eplepsyres.2017.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 12/01/2017] [Accepted: 12/08/2017] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Ictal activity itself can cause pathological cerebrospinal fluid (CSF) findings. However, data regarding pathological CSF findings caused by SE itself to date remain scarce. We here evaluated the frequency and specificity of pathological CSF findings in non-infectious SE. METHODS We performed a retrospective analysis of CSF samples in adult patients with episodes of non-infectious SE, who had been admitted to the Department of Neurology, University Hospital of Cologne. The following parameters were assessed: cell count, protein, and lactate content, CSF/serum glucose quotient (QGlc), disturbances of blood-brain-barrier function assessed by CSF/serum albumin quotient (QAlb), and qualitative intrathecal IgG synthesis assessed by unmatched oligoclonal bands in CSF. RESULTS We analysed 54 episodes of non-infectious SE in which CSF had been obtained. CSF pleocytosis was infrequent (6%). Elevated CSF protein content was present in 44% of all cases, whereas elevated CSF lactate content was found in 23% of the cases. A decreased QGlc was present in 9%. Dysfunction of blood-brain-barrier (BBBD) was the most frequent pathological finding, amounting to 55%. Unmatched oligoclonal bands in CSF were seen in 10% of non-infectious SE. Further analysis revealed that elevated CSF protein content was found predominantly in recfractory SE (p = 0.04). Elevated CSF lactate content was associated with shorter latency between onset of SE and CSF retrieval (p = 0.004), positive history of epilepsy (p = 0.02) and an acute symptomatic etiology (p = 0.04). BBBD was also present more often in acute symptomatic SE (p = 0.001) and was the sole pathological CSF parameter associated with clinical outcome: presence of BBBD was associated with a less favorable outcome (p = 0.02). SIGNIFICANCE Non-infectious SE itself does not commonly cause CSF pleocytosis. Data suggest that the detection of CSF pleocytosis should prompt further diagnostics for an underlying infectious or neoplastic etiology. In contrast, elevation of CSF protein content and BBBD were found frequently in non-infectious SE.
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Fredriksson L, Lawrence DA, Medcalf RL. tPA Modulation of the Blood-Brain Barrier: A Unifying Explanation for the Pleiotropic Effects of tPA in the CNS. Semin Thromb Hemost 2017; 43:154-168. [PMID: 27677179 PMCID: PMC5848490 DOI: 10.1055/s-0036-1586229] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The plasminogen activation (PA) system is best known for its role in fibrinolysis. However, it has also been shown to regulate many nonfibrinolytic functions in the central nervous system (CNS). In particular, tissue-type plasminogen activator (tPA) is reported to have pleiotropic activities in the CNS, regulating events such as neuronal plasticity, excitotoxicity, and cerebrovascular barrier integrity, whereas urokinase-type plasminogen activator is mainly associated with tissue remodeling and cell migration. It has been suggested that the role tPA plays in controlling barrier integrity may provide a unifying mechanism for the reported diverse, and often opposing, functions ascribed to tPA in the CNS. Here we will review the possibility that the pleiotropic effects reported for tPA in physiologic and pathologic processes in the CNS may be a consequence of its role in the neurovascular unit in regulation of cerebrovascular responses and subsequently parenchymal homeostasis. We propose that this might offer an explanation for the ongoing debate regarding the neurotoxic versus neuroprotective roles of tPA.
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Affiliation(s)
- Linda Fredriksson
- Department of Medical Biochemistry & Biophysics, Division of Vascular Biology, Karolinska Institutet, Stockholm, Sweden
- Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Daniel A. Lawrence
- Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI USA
| | - Robert L. Medcalf
- Molecular Neurotrauma and Haemostasis, Australian Centre for Blood Diseases, Monash University, Melbourne, Australia
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Sahin D, Yilmaz CU, Orhan N, Arican N, Kaya M, Gürses C, Ates N, Ahishali B. Changes in electroencephalographic characteristics and blood-brain barrier permeability in WAG/Rij rats with cortical dysplasia. Epilepsy Behav 2017; 67:70-76. [PMID: 28088684 DOI: 10.1016/j.yebeh.2016.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/06/2016] [Accepted: 11/03/2016] [Indexed: 12/13/2022]
Abstract
PURPOSE This study investigated the effects of cortical dysplasia (CD) on electrophysiology and blood-brain barrier (BBB) permeability in WAG/Rij rats with genetic absence epilepsy. METHODS Pregnant WAG/Rij rats were exposed to 145cGy of gamma-irradiation on embryonic day 17 to induce CD. An electroencephalogram was recorded from cortices subdurally in the offspring of the pregnant animals. Horseradish peroxidase (HRP) was used as determinant of BBB permeability. RESULTS A massive tissue loss in the cerebral cortex was seen in WAG/Rij rats with CD (p<0.05). There was a significant decrease in the number and duration of spike-and-wave discharges (SWDs) and an increase in the frequency of SWDs in the WAG/Rij rats with CD when compared with the properties of SWDs in intact WAG/Rij rats (p<0.01). Ultrastructurally, the accumulation of HRP reaction products in the cerebral cortex and thalamus of WAG/Rij rats was significantly higher than that of control values (p<0.01). The accumulation of HRP reaction products in the cerebral cortex and thalamus regions of WAG/Rij rats with CD increased and was higher than that of the control and WAG/Rij animals (p<0.01). CONCLUSION In our study, we showed that number and duration of SWDs decreased and SWD frequency increased in WAG/Rij rats with CD, suggesting a shift in seizure pattern. The association of these alterations with significant loss of cortical thickness and increased BBB permeability to HRP tracer may represent a causal relation of the EEG abnormalities with cerebral structural changes in these animals.
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Affiliation(s)
- Deniz Sahin
- Department of Physiology, Medical Faculty of Kocaeli University, Kocaeli, Turkey
| | - Canan Ugur Yilmaz
- Department of Laboratory Animals Science, Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Nurcan Orhan
- Department of Neuroscience, Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Nadir Arican
- Department of Forensic Medicine, Istanbul Faculty of Medicine, Istanbul University, Turkey
| | - Mehmet Kaya
- Koç University School of Medicine, Department of Physiology, Rumelifeneri Yolu, Sarıyer, 34450 Istanbul, Turkey.
| | - Candan Gürses
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Turkey
| | - Nurbay Ates
- Department of Physiology, Medical Faculty of Kocaeli University, Kocaeli, Turkey
| | - Bulent Ahishali
- Department of Histology and Embryology, Istanbul Faculty of Medicine, Istanbul University, Turkey
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Matrix Metalloproteinase 9 in Epilepsy: The Role of Neuroinflammation in Seizure Development. Mediators Inflamm 2016; 2016:7369020. [PMID: 28104930 PMCID: PMC5220508 DOI: 10.1155/2016/7369020] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 11/27/2016] [Indexed: 12/11/2022] Open
Abstract
Matrix metalloproteinase 9 is a proteolytic enzyme which is recently one of the more often studied biomarkers. Its possible use as a biomarker of neuronal damage in stroke, heart diseases, tumors, multiple sclerosis, and epilepsy is being widely indicated. In epilepsy, MMP-9 is suggested to play a role in epileptic focus formation and in the stimulation of seizures. The increase of MMP-9 activity in the epileptic focus was observed both in animal models and in clinical studies. MMP-9 contributes to formation of epileptic focus, for example, by remodeling of synapses. Its proteolytic action on the elements of blood-brain barrier and activation of chemotactic processes facilitates accumulation of inflammatory cells and induces seizures. Also modification of glutamatergic transmission by MMP-9 is associated with seizures. In this review we will try to recapitulate the results of previous studies about MMP-9 in terms of its association with epilepsy. We will discuss the mechanisms of its actions and present the results revealed in animal models and clinical studies. We will also provide a comparison of the results of various studies on MMP-9 levels in the context of its possible use as a biomarker of the activity of epilepsy.
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Magnesium in obstetric anesthesia and intensive care. J Anesth 2016; 31:127-139. [PMID: 27803982 DOI: 10.1007/s00540-016-2257-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Accepted: 09/24/2016] [Indexed: 12/14/2022]
Abstract
Magnesium, one of the essential elements in the human body, has numerous favorable effects that offer a variety of possibilities for its use in obstetric anesthesia and intensive care. Administered as a single intravenous bolus dose or a bolus followed by continuous infusion during surgery, magnesium attenuates stress response to endotracheal intubation, and reduces intraoperative anesthetic and postoperative analgesic requirements, while at the same time preserving favorable hemodynamics. Applied as part of an intrathecal or epidural anesthetic mixture, magnesium prolongs the duration of anesthesia and diminishes total postoperative analgesic consumption with no adverse maternal or neonatal effects. In obstetric intensive care, magnesium represents a first-choice medication in the treatment and prevention of eclamptic seizures. If used in recommended doses with close monitoring, magnesium is a safe and effective medication.
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Harden CL, Pennell PB, French JA, Davis A, Lau C, Llewellyn N, Kaufman B, Bagiella E, Kirshenbaum A. Anti-mullerian hormone is higher in seizure-free women with epilepsy compared to those with ongoing seizures. Epilepsy Res 2016; 127:66-71. [PMID: 27565413 DOI: 10.1016/j.eplepsyres.2016.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 07/13/2016] [Accepted: 08/06/2016] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To determine if anti-mullerian hormone (AMH), a neuroactive peptide hormone and a measure of ovarian reserve, is different between women with epilepsy (WWE) and healthy controls (HC) seeking pregnancy and to evaluate epilepsy-related factors associated with AMH concentrations. METHODS Subjects were participants in Women with Epilepsy: Pregnancy Outcomes and Deliveries (WEPOD), a multi-center prospective, observational cohort study evaluating fecundity in WWE compared to HC, ages 18-40 years. WWE were divided into a Sz+ group or a Sz- group, dependent on whether they had seizures within the 9 months prior to enrollment. Serum was collected, and AMH concentrations were measured as an exploratory analysis. Linear and logistic regression models were used to assess associations and control for covariates. RESULTS Serum AMH concentrations were measured in 72 out of 90 enrolled WWE and 97 out of 109 HC; the remaining subjects became pregnant before serum was obtained. Thirty WWE were in the Sz+ group and 40 in the Sz- group (retrospective seizure information was missing for two). All AMH concentrations were within the range, however, the normal inverse correlation between age and AMH was present in the HC and in the Sz- groups, but was lacking in the Sz+ group. Mean AMH concentration was higher in the Sz- group (3982pg/ml (SD+/-2452)) compared to the Sz+ group of WWE (2776pg/ml (SD+/-2308)) and HCs (3241 (SD±2647)). All values were within the expected range for age. In WWE, by linear regression, after controlling for age and BMI, seizure occurrence remained associated with AMH (p=0.025). In the prospective phase of the study, AMH concentrations were also associated with seizure occurrence during the menstrual cycle in which the serum sample was obtained (p=0.012). Antiepileptic drugs and other epilepsy factors were not associated with AMH concentrations. When analyzing the Sz- WWE group and the HC group by linear regression with AMH as the dependent variable, after controlling for age and BMI, the association with AMH was also present (p=0.017). AMH concentrations of the Sz+ group and HCs did not differ. SIGNIFICANCE In this exploratory analysis, seizure freedom was associated with higher AMH concentrations compared to women with ongoing seizures and to HCs. Future studies should further investigate the mechanism of the association of AMH with seizure occurrence, whether AMH could have a direct seizure-protective neuroactive hormone effect, as well as implications of AMH concentrations as a biomarker for ovarian reserve in women with epilepsy.
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Affiliation(s)
- Cynthia L Harden
- Icahn School of Medicine at Mount Sinai, 1428 Madison Ave, New York, NY, 11029, USA.
| | - Page B Pennell
- Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA, 02115, USA.
| | | | - Anne Davis
- Columbia University Medical Center, 630 W 168th St, New York, NY, 10032, USA.
| | - Connie Lau
- Northwell Health, 611 Northern Boulevard, Great Neck, NY, 11021, USA.
| | - Nichelle Llewellyn
- Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA, 02115, USA.
| | - Benjamin Kaufman
- NYU School of Medicine, 462 1st Avenue, New York, NY, 10016, USA.
| | - Emilia Bagiella
- Icahn School of Medicine at Mount Sinai, 1428 Madison Ave, New York, NY, 11029, USA.
| | - Ariel Kirshenbaum
- Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA, 02115, USA.
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Hora R, Kapoor P, Thind KK, Mishra PC. Cerebral malaria--clinical manifestations and pathogenesis. Metab Brain Dis 2016; 31:225-37. [PMID: 26746434 DOI: 10.1007/s11011-015-9787-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 12/22/2015] [Indexed: 01/28/2023]
Abstract
One of the most common central nervous system diseases in tropical countries is cerebral malaria (CM). Malaria is a common protozoan infection that is responsible for enormous worldwide mortality and economic burden on the society. Episodes of Plasmodium falciparum (Pf) caused CM may be lethal, while survivors are likely to suffer from persistent debilitating neurological deficits, especially common in children. In this review article, we have summarized the various symptoms and manifestations of CM in children and adults, and entailed the molecular basis of the disease. We have also emphasized how pathogenesis of the disease is effected by the parasite and host responses including blood brain barrier (BBB) disruption, endothelial cell activation and apoptosis, nitric oxide bioavailability, platelet activation and apoptosis, and neuroinflammation. Based on a few recent studies carried out in experimental mouse malaria models, we propose a basis for the neurological deficits and sequelae observed in human cerebral malaria, and summarize how existing drugs may improve prognosis in affected individuals.
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Affiliation(s)
- Rachna Hora
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Payal Kapoor
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar, 143005, India
| | - Kirandeep Kaur Thind
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar, 143005, India
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Zhai X, Liang P, Li Y, Li L, Zhou Y, Wu X, Deng J, Jiang L. Astrocytes Regulate Angiogenesis Through the Jagged1-Mediated Notch1 Pathway After Status Epilepticus. Mol Neurobiol 2015; 53:5893-5901. [DOI: 10.1007/s12035-015-9492-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 10/15/2015] [Indexed: 12/31/2022]
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Johnson AC, Cipolla MJ. The cerebral circulation during pregnancy: adapting to preserve normalcy. Physiology (Bethesda) 2015; 30:139-47. [PMID: 25729059 DOI: 10.1152/physiol.00048.2014] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The adaptation of the brain and cerebral circulation to pregnancy are unique compared with other organs and circulatory systems, ultimately functioning to maintain brain homeostasis. In this review, the effect of pregnancy on critical functions of the cerebral circulation is discussed, including changes occurring at the endothelium and blood-brain barrier, and changes in the structure and function of cerebral arteries and arterioles, hemodynamics, and cerebral blood flow autoregulation.
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Affiliation(s)
- Abbie C Johnson
- Department of Neurological Sciences, University of Vermont College of Medicine, Burlington, Vermont
| | - Marilyn J Cipolla
- Department of Neurological Sciences, University of Vermont College of Medicine, Burlington, Vermont
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Gorter JA, van Vliet EA, Aronica E. Status epilepticus, blood-brain barrier disruption, inflammation, and epileptogenesis. Epilepsy Behav 2015; 49:13-6. [PMID: 25958228 DOI: 10.1016/j.yebeh.2015.04.047] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 04/19/2015] [Indexed: 11/15/2022]
Abstract
Over the last 15 years, attention has been focused on dysfunction of the cerebral vasculature and inflammation as important players in epileptogenic processes, with a specific emphasis on failure of the blood-brain barrier (BBB; Fig. 1) (Seiffert et al., 2004; Marchi et al., 2007; Oby and Janigro, 2006; van Vliet et al., 2014; Vezzani et al., 2011) [3-7]. Here, we discuss how the BBB is disrupted as a consequence of SE and how this BBB breakdown may be involved in epileptogenesis. This article is part of a Special Issue entitled "Status Epilepticus".
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Affiliation(s)
- Jan A Gorter
- Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands.
| | - Erwin A van Vliet
- Academic Medical Center, Department of (Neuro)Pathology, University of Amsterdam, Amsterdam, The Netherlands
| | - Eleonora Aronica
- Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands; Academic Medical Center, Department of (Neuro)Pathology, University of Amsterdam, Amsterdam, The Netherlands; SEIN - Stichting Epilepsie Instellingen Nederland, Heemstede, The Netherlands
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Fredriksson L, Stevenson TK, Su EJ, Ragsdale M, Moore S, Craciun S, Schielke GP, Murphy GG, Lawrence DA. Identification of a neurovascular signaling pathway regulating seizures in mice. Ann Clin Transl Neurol 2015; 2:722-38. [PMID: 26273685 PMCID: PMC4531055 DOI: 10.1002/acn3.209] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 03/30/2015] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE A growing body of evidence suggests that increased blood-brain barrier (BBB) permeability can contribute to the development of seizures. The protease tissue plasminogen activator (tPA) has been shown to promote BBB permeability and susceptibility to seizures. In this study, we examined the pathway regulated by tPA in seizures. METHODS An experimental model of kainate-induced seizures was used in genetically modified mice, including mice deficient in tPA (tPA (-/-) ), its inhibitor neuroserpin (Nsp (-/-) ), or both (Nsp:tPA (-/-) ), and in mice conditionally deficient in the platelet-derived growth factor receptor alpha (PDGFRα). RESULTS Compared to wild-type (WT) mice, Nsp (-/-) mice have significantly reduced latency to seizure onset and generalization; whereas tPA (-/-) mice have the opposite phenotype, as do Nsp:tPA (-/-) mice. Furthermore, interventions that maintain BBB integrity delay seizure propagation, whereas osmotic disruption of the BBB in seizure-resistant tPA (-/-) mice dramatically reduces the time to seizure onset and accelerates seizure progression. The phenotypic differences in seizure progression between WT, tPA (-/-) , and Nsp (-/-) mice are also observed in electroencephalogram recordings in vivo, but absent in ex vivo electrophysiological recordings where regulation of the BBB is no longer necessary to maintain the extracellular environment. Finally, we demonstrate that these effects on seizure progression are mediated through signaling by PDGFRα on perivascular astrocytes. INTERPRETATION Together, these data identify a specific molecular pathway involving tPA-mediated PDGFRα signaling in perivascular astrocytes that regulates seizure progression through control of the BBB. Inhibition of PDGFRα signaling and maintenance of BBB integrity might therefore offer a novel clinical approach for managing seizures.
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Affiliation(s)
- Linda Fredriksson
- Division of Vascular Biology, Department of Medical Biochemistry & Biophysics, Karolinska Institutet Stockholm, Sweden ; Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan
| | - Tamara K Stevenson
- Department of Molecular and Integrative Physiology, University of Michigan Medical School Ann Arbor, Michigan
| | - Enming J Su
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan
| | - Margaret Ragsdale
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan
| | - Shannon Moore
- Molecular and Behavioral Neuroscience Institute, University of Michigan Medical School Ann Arbor, Michigan
| | - Stefan Craciun
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan
| | - Gerald P Schielke
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan
| | - Geoffrey G Murphy
- Department of Molecular and Integrative Physiology, University of Michigan Medical School Ann Arbor, Michigan ; Molecular and Behavioral Neuroscience Institute, University of Michigan Medical School Ann Arbor, Michigan
| | - Daniel A Lawrence
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School Ann Arbor, Michigan ; Department of Molecular and Integrative Physiology, University of Michigan Medical School Ann Arbor, Michigan
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Gudiño-Cabrera G, Ureña-Guerrero ME, Rivera-Cervantes MC, Feria-Velasco AI, Beas-Zárate C. Excitotoxicity triggered by neonatal monosodium glutamate treatment and blood-brain barrier function. Arch Med Res 2014; 45:653-9. [PMID: 25431840 DOI: 10.1016/j.arcmed.2014.11.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 11/13/2014] [Indexed: 12/21/2022]
Abstract
It is likely that monosodium glutamate (MSG) is the excitotoxin that has been most commonly employed to characterize the process of excitotoxicity and to improve understanding of the ways that this process is related to several pathological conditions of the central nervous system. Excitotoxicity triggered by neonatal MSG treatment produces a significant pathophysiological impact on adulthood, which could be due to modifications in the blood-brain barrier (BBB) permeability and vice versa. This mini-review analyzes this topic through brief descriptions about excitotoxicity, BBB structure and function, role of the BBB in the regulation of Glu extracellular levels, conditions that promote breakdown of the BBB, and modifications induced by neonatal MSG treatment that could alter the behavior of the BBB. In conclusion, additional studies to better characterize the effects of neonatal MSG treatment on excitatory amino acids transporters, ionic exchangers, and efflux transporters, as well as the role of the signaling pathways mediated by erythropoietin and vascular endothelial growth factor in the cellular elements of the BBB, should be performed to identify the mechanisms underlying the increase in neurovascular permeability associated with excitotoxicity observed in several diseases and studied using neonatal MSG treatment.
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Affiliation(s)
- Graciela Gudiño-Cabrera
- Departamento de Biología Celular y Molecular, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Zapopan, Jalisco, México
| | - Monica E Ureña-Guerrero
- Departamento de Biología Celular y Molecular, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Zapopan, Jalisco, México
| | - Martha C Rivera-Cervantes
- Departamento de Biología Celular y Molecular, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Zapopan, Jalisco, México
| | - Alfredo I Feria-Velasco
- Departamento de Biología Celular y Molecular, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Zapopan, Jalisco, México
| | - Carlos Beas-Zárate
- Departamento de Biología Celular y Molecular, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Zapopan, Jalisco, México; División de Neurociencias, CIBO, IMSS, Guadalajara, Jalisco, México.
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36
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Magnesium sulfate treatment reverses seizure susceptibility and decreases neuroinflammation in a rat model of severe preeclampsia. PLoS One 2014; 9:e113670. [PMID: 25409522 PMCID: PMC4237502 DOI: 10.1371/journal.pone.0113670] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 10/27/2014] [Indexed: 12/20/2022] Open
Abstract
Eclampsia, defined as unexplained seizure in a woman with preeclampsia, is a life-threatening complication of pregnancy with unclear etiology. Magnesium sulfate (MgSO4) is the leading eclamptic seizure prophylactic, yet its mechanism of action remains unclear. Here, we hypothesized severe preeclampsia is a state of increased seizure susceptibility due to blood-brain barrier (BBB) disruption and neuroinflammation that lowers seizure threshold. Further, MgSO4 decreases seizure susceptibility by protecting the BBB and preventing neuroinflammation. To model severe preeclampsia, placental ischemia (reduced uteroplacental perfusion pressure; RUPP) was combined with a high cholesterol diet (HC) to cause maternal endothelial dysfunction. RUPP+HC rats developed symptoms associated with severe preeclampsia, including hypertension, oxidative stress, endothelial dysfunction and fetal and placental growth restriction. Seizure threshold was determined by quantifying the amount of pentylenetetrazole (PTZ; mg/kg) required to elicit seizure in RUPP+HC±MgSO4 and compared to normal pregnant controls (n = 6/group; gestational day 20). RUPP+HC rats were more sensitive to PTZ with seizure threshold being ∼65% lower vs. control (12.4±1.7 vs. 36.7±3.9 mg/kg PTZ; p<0.05) that was reversed by MgSO4 (45.7±8.7 mg/kg PTZ; p<0.05 vs. RUPP+HC). BBB permeability to sodium fluorescein, measured in-vivo (n = 5–7/group), was increased in RUPP+HC vs. control rats, with more tracer passing into the brain (15.9±1.0 vs. 12.2±0.3 counts/gram ×1000; p<0.05) and was unaffected by MgSO4 (15.6±1.0 counts/gram ×1000; p<0.05 vs. controls). In addition, RUPP+HC rats were in a state of neuroinflammation, indicated by 35±2% of microglia being active compared to 9±2% in normal pregnancy (p<0.01; n = 3–8/group). MgSO4 treatment reversed neuroinflammation, reducing microglial activation to 6±2% (p<0.01 vs. RUPP+HC). Overall, RUPP+HC rats were in a state of augmented seizure susceptibility potentially due to increased BBB permeability and neuroinflammation. MgSO4 treatment reversed this, increasing seizure threshold and decreasing neuroinflammation, without affecting BBB permeability. Thus, reducing neuroinflammation may be one mechanism by which MgSO4 prevents eclampsia during severe preeclampsia.
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van Vliet E, Aronica E, Gorter J. Role of blood–brain barrier in temporal lobe epilepsy and pharmacoresistance. Neuroscience 2014; 277:455-73. [DOI: 10.1016/j.neuroscience.2014.07.030] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 07/17/2014] [Accepted: 07/21/2014] [Indexed: 12/14/2022]
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Mazur-Kolecka B, Cohen IL, Gonzalez M, Jenkins EC, Kaczmarski W, Brown WT, Flory M, Frackowiak J. Autoantibodies against neuronal progenitors in sera from children with autism. Brain Dev 2014; 36:322-9. [PMID: 23838310 DOI: 10.1016/j.braindev.2013.04.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/09/2013] [Accepted: 04/30/2013] [Indexed: 12/13/2022]
Abstract
The pathological role of autoantibodies in development of CNS disorders is a new idea with growing interest among neuroscientists. The involvement of autoimmune response in the pathogenesis of autism spectrum disorders (ASD) has been suggested by the presence of multiple brain-specific autoantibodies in children with ASD and in their mothers. The possibility of the effect of autoimmunity on neurogenesis and postnatal brain plasticity has not been determined. The presence of autoantibodies against human neuronal progenitor cells (NPCs) stimulated for neuronal differentiation in culture was tested in sera from children with autism (n=20) and age-matched controls (n=18) by immunoblotting and immunocytochemistry. Immunoreactivity against multiple NPCs proteins of molecular sizes of approximately 55 kDa, 105 kDa, 150 kDa, and 210 kDa in sera from individuals with autism had a higher incidence and was stronger than in control sera which immunoreacted mainly with a 150 kDa protein. The sera from children with autism immunoreacted the strongest with NPCs expressing neuronal markers Tuj1 and doublecortin, but not astrocyte marker GFAP. The epitopes recognized by antibodies from sera were not human-specific because they detected also NPCs in situ in murine hippocampus. The autoimmune reactions against NPCs suggest an impaired tolerance to neural antigens in autism. These autoantibodies may be symptomatic for autism and furthermore, their presence suggests that autoimmunity may affect postnatal neuronal plasticity particularly after impairment of blood-brain barrier. Future studies will determine the diagnostic value of the presence of autoantibodies in autism and the therapeutic value of prevention of autoimmunity in autism.
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Affiliation(s)
- Bozena Mazur-Kolecka
- Department of Developmental Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, USA.
| | | | | | | | - Wojciech Kaczmarski
- Department of Developmental Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, USA
| | - W Ted Brown
- Department of Human Genetics, NYS IBRDD, USA
| | - Michael Flory
- Laboratory of Research Design and Analysis, NYS IBRDD, USA
| | - Janusz Frackowiak
- Department of Developmental Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, USA
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van Vliet EA, Otte WM, Gorter JA, Dijkhuizen RM, Wadman WJ. Longitudinal assessment of blood-brain barrier leakage during epileptogenesis in rats. A quantitative MRI study. Neurobiol Dis 2013; 63:74-84. [PMID: 24321435 DOI: 10.1016/j.nbd.2013.11.019] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 11/22/2013] [Accepted: 11/27/2013] [Indexed: 12/20/2022] Open
Abstract
The blood-brain barrier (BBB) plays an important role in the homeostasis of the brain. BBB dysfunction has been implicated in the pathophysiology of various neurological disorders, including epilepsy in which it may contribute to disease progression. Precise understanding of BBB dynamics during epileptogenesis may be of importance for the assessment of future therapies, including BBB leakage blocking-agents. Longitudinal changes in BBB integrity can be studied with in vivo magnetic resonance imaging (MRI) in combination with paramagnetic contrast agents. Although this approach has shown to be suitable to detect major BBB leakage during the acute phase in experimental epilepsy models, so far no studies have provided information on dynamics of the extent of BBB leakage towards later phases. Therefore a sensitive and quantitative approach was used in the present study, involving fast T1 mapping (dynamic approach) during a steady-state infusion of gadobutrol, as well as pre- and post-contrast T1-weighted MRI (post-pre approach). This was applied in an experimental epilepsy model in which previous MRI studies failed to detect BBB leakage during epileptogenesis. Adult male Sprague-Dawley rats were injected with kainic acid to induce status epilepticus (SE). MRI experiments were performed before SE (control) and during the acute (1 day) and chronic epileptic phases (6 weeks after SE). BBB leakage was quantified by fast T1 mapping (Look-Locker gradient echo MRI) with a time resolution of 48 s from 5 min before up to 45 min after 20 min step-down infusion of 0.2M gadobutrol. In addition, T1-weighted MRI was acquired before and 45 min after infusion. MRI data were compared to post-mortem microscopic analysis using the BBB tracer fluorescein. Our MRI data showed BBB leakage, which was evident at 1 day and 6 weeks after SE in the hippocampus, entorhinal cortex, amygdala and piriform cortex. These findings were confirmed by microscopic analysis of fluorescein leakage. Furthermore, our MRI data revealed non-uniform BBB leakage throughout epileptogenesis. This study demonstrates BBB leakage in specific brain regions during epileptogenesis, which can be quantified using MRI. Therefore, MRI may be a valuable tool for experimental or clinical studies to elucidate the role of the BBB in epileptogenesis.
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Affiliation(s)
- E A van Vliet
- Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands; Epilepsy Institute in The Netherlands Foundation (Stichting Epilepsie Instellingen Nederland, SEIN), Heemstede, The Netherlands.
| | - W M Otte
- Biomedical MR Imaging and Spectroscopy Group, Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands; Department of Pediatric Neurology, Rudolf Magnus Institute of Neuroscience, University medical Center Utrecht, Utrecht, The Netherlands
| | - J A Gorter
- Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands; Epilepsy Institute in The Netherlands Foundation (Stichting Epilepsie Instellingen Nederland, SEIN), Heemstede, The Netherlands
| | - R M Dijkhuizen
- Biomedical MR Imaging and Spectroscopy Group, Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands
| | - W J Wadman
- Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands; Epilepsy Institute in The Netherlands Foundation (Stichting Epilepsie Instellingen Nederland, SEIN), Heemstede, The Netherlands
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Lévesque M, Avoli M. The kainic acid model of temporal lobe epilepsy. Neurosci Biobehav Rev 2013; 37:2887-99. [PMID: 24184743 DOI: 10.1016/j.neubiorev.2013.10.011] [Citation(s) in RCA: 373] [Impact Index Per Article: 33.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 10/16/2013] [Accepted: 10/22/2013] [Indexed: 01/01/2023]
Abstract
The kainic acid model of temporal lobe epilepsy has greatly contributed to the understanding of the molecular, cellular and pharmacological mechanisms underlying epileptogenesis and ictogenesis. This model presents with neuropathological and electroencephalographic features that are seen in patients with temporal lobe epilepsy. It is also characterized by a latent period that follows the initial precipitating injury (i.e., status epilepticus) until the appearance of recurrent seizures, as observed in the human condition. Finally, the kainic acid model can be reproduced in a variety of species using either systemic, intrahippocampal or intra-amygdaloid administrations. In this review, we describe the various methodological procedures and evaluate their differences with respect to the behavioral, electroencephalographic and neuropathological correlates. In addition, we compare the kainic acid model with other animal models of temporal lobe epilepsy such as the pilocarpine and the kindling model. We conclude that the kainic acid model is a reliable tool for understanding temporal lobe epilepsy, provided that the differences existing between methodological procedures are taken into account.
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Affiliation(s)
- Maxime Lévesque
- Montreal Neurological Institute and Departments of Neurology & Neurosurgery, and of Physiology, McGill University, Montréal, QC, Canada H3A 2B4
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Knight WA, Hart KW, Adeoye OM, Bonomo JB, Keegan SP, Ficker DM, Szaflarski JP, Privitera MD, Lindsell CJ. The incidence of seizures in patients undergoing therapeutic hypothermia after resuscitation from cardiac arrest. Epilepsy Res 2013; 106:396-402. [PMID: 23906560 DOI: 10.1016/j.eplepsyres.2013.06.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 06/11/2013] [Accepted: 06/28/2013] [Indexed: 10/26/2022]
Abstract
STUDY OBJECTIVE Non-convulsive seizures/status epilepticus occur in approximately 20% of comatose, non-cardiac arrest intensive care unit (ICU) patients, and are associated with increased mortality. The prevalence and clinical significance of seizures in comatose survivors of cardiac arrest undergoing therapeutic hypothermia is not well described. METHODS At this urban level I trauma center, every patient undergoing therapeutic hypothermia is monitored with continuous video encephalography (cvEEG). We abstracted medical records for all cardiac arrest patients treated with therapeutic hypothermia during 2010. Clinical data were extracted in duplicate. cvEEGs were independently reviewed for seizures by two board-certified epileptologists. RESULTS There were 33 patients treated with therapeutic hypothermia after cardiac arrest in 2010 who met inclusion criteria for this study. Median age was 58 (range 28-86 years), 63% were white, 55% were male, and 9% had a history of seizures or epilepsy. During cooling, seizures occurred in 5/33 patients (15%, 95%CI 6%-33%). 11/33 patients (33%, 95% CI 19%-52%) had seizures at some time during hospitalization. 13/33 (39%) survived to discharge and of these, 7/13 (54%) survived to 30 days. 9/11 patients with seizures died during hospitalization, compared with 11/22 patients without seizures (82% vs. 50%; difference 32%, CI 951%-63%). No patient with seizures was alive at 30 days. CONCLUSIONS Seizures are common in comatose patients treated with therapeutic hypothermia after cardiac arrest. All patients with seizures were deceased within 30 days of discharge. Routine use of EEG monitoring could assist in early detection of seizures in this patient population, providing an opportunity for intervention to potentially improve outcomes.
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Affiliation(s)
- William A Knight
- University of Cincinnati, Department of Emergency Medicine, 231 Albert Sabin Way, ML 0769, Cincinnati, OH 45267-0769, USA; University of Cincinnati, Department of Neurosurgery, Division of Neurocritical Care, 231 Albert Sabin Way, ML 0769, Cincinnati, OH 45267-0769, USA.
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Li YJ, Wang ZH, Zhang B, Zhe X, Wang MJ, Shi ST, Bai J, Lin T, Guo CJ, Zhang SJ, Kong XL, Zuo X, Zhao H. Disruption of the blood-brain barrier after generalized tonic-clonic seizures correlates with cerebrospinal fluid MMP-9 levels. J Neuroinflammation 2013; 10:80. [PMID: 23829879 PMCID: PMC3706217 DOI: 10.1186/1742-2094-10-80] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Accepted: 06/24/2013] [Indexed: 02/06/2023] Open
Abstract
Background Increasing evidence suggests seizures cause blood–brain barrier (BBB) dysfunction including decreased seizure threshold and higher onset potential of future seizures. However, the mechanisms underlying BBB damage in seizures remains poorly understood. Evidence in human and animal models shows BBB disruption is associated with activation of matrix metalloproteinase-9 (MMP-9) after cerebral ischemia and inflammation. The objective of this study was to determine whether MMP-9 concentrations in cerebral spinal fluid (CSF) are associated with BBB disruption in patients after epileptic seizures. Methods Thirty-one patients with generalized tonic-clonic (GTC) seizures were included in the study: 20 had recurrent GTC seizures (RS), and 11 had a single GTC seizure (SS) episode. Twenty-five adult non-seizure patients were used as controls. CSF samples were collected by lumbar puncture within 24 h after seizure cessation (range: 3–15 h, mean 6.2 h). CSF MMP-9 levels were determined by an enzyme-linked immunosorbent assay (ELISA). MMP enzyme activity was measured by gelatin zymography. The CSF/serum albumin ratio (albumin quotient, QAlb) was used as a measure of blood–brain barrier permeability. Results We found significantly higher CSF MMP-9 concentrations in seizure patients compared with controls (P < 0.001). CSF MMP-9 levels and QAlb values were higher in RS patients compared with SS and controls. Moreover, CSF MMP-9 concentration showed strong correlation between QAlb values (r = 0.76, P < 0.0001) and between CSF leukocyte counts (r = 0.77, P < 0.0001) in patients after seizures. Gelatin zymography showed MMP-9 proteolytic activity only in GTC seizure patients. Conclusions Our results suggest MMP-9 plays a role in BBB dysfunction, characterized by invasion of leukocytes into the CSF during seizures.
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Affiliation(s)
- Ya-Jun Li
- Department of Neurology, The Affiliated Hospital of Xi'an Medical University, No, 48, West Fenghao Road, Xi'an 710077, Shaanxi Province, China.
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Jimenez-Mateos E, Henshall D. Epilepsy and microRNA. Neuroscience 2013; 238:218-29. [DOI: 10.1016/j.neuroscience.2013.02.027] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 01/18/2013] [Accepted: 02/15/2013] [Indexed: 12/11/2022]
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Topiramate reduces blood–brain barrier disruption and inhibits seizure activity in hyperthermia-induced seizures in rats with cortical dysplasia. Brain Res 2013. [DOI: 10.1016/j.brainres.2012.11.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Michalak Z, Sano T, Engel T, Miller-Delaney SF, Lerner-Natoli M, Henshall DC. Spatio-temporally restricted blood–brain barrier disruption after intra-amygdala kainic acid-induced status epilepticus in mice. Epilepsy Res 2013. [DOI: 10.1016/j.eplepsyres.2012.10.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Morin-Brureau M, Rigau V, Lerner-Natoli M. Why and how to target angiogenesis in focal epilepsies. Epilepsia 2013; 53 Suppl 6:64-8. [PMID: 23134498 DOI: 10.1111/j.1528-1167.2012.03705.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We previously reported that blood-brain barrier (BBB) disruption was associated with a pathologic angiogenesis in patients with intractable temporal lobe epilepsy (TLE) and in vivo models. This was confirmed by the overexpression of vascular endothelial growth factor (VEGF) in neurons and astrocytes and of its receptor vascular endothelial growth factor-2 (VEGF-R2) (or flk1) in endothelial cells. Using an original in vitro model, we showed that seizures were sufficient to activate the VEGF/VEGF-R2 system, which promotes vascularization and tight junction disassembly. Such a BBB dysfunction was shown to contribute to epileptogenesis. Therefore, we postulate that drugs that target the specific VEGF-R2 pathways involved in permeability are able to repair the BBB, and, therefore, could reduce epileptogenicity.
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Affiliation(s)
- Mélanie Morin-Brureau
- Institute of Genomics Functional, CNRS UMR 5203, INSERM U661, University Montpellier 1&2, Montpellier, France.
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Lapilover EG, Lippman K, Salar S, Maslarova A, Dreier JP, Heinemann U, Friedman A. Peri-infarct blood-brain barrier dysfunction facilitates induction of spreading depolarization associated with epileptiform discharges. Neurobiol Dis 2012; 48:495-506. [PMID: 22782081 PMCID: PMC3588590 DOI: 10.1016/j.nbd.2012.06.024] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 06/12/2012] [Accepted: 06/27/2012] [Indexed: 11/17/2022] Open
Abstract
Recent studies showed that spreading depolarizations (SDs) occurs abundantly in patients following ischemic stroke and experimental evidence suggests that SDs recruit tissue at risk into necrosis. We hypothesized that BBB opening with consequent alterations of the extracellular electrolyte composition and extravasation of albumin facilitates generation of SDs since albumin mediates an astrocyte transcriptional response with consequent disturbance of potassium and glutamate homeostasis. Here we show extravasation of Evans blue-albumin complex into the hippocampus following cortical photothrombotic stroke in the neighboring neocortex. Using extracellular field potential recordings and exposure to serum electrolytes we observed spontaneous SDs in 80% of hippocampal slices obtained from rats 24 h after cortical photothrombosis. Hippocampal exposure to albumin for 24 h through intraventricular application together with serum electrolytes lowered the threshold for the induction of SDs in most slices irrespective of the pathway of stimulation. Exposing acute slices from naive animals to albumin led also to a reduced SD threshold. In albumin-exposed slices the onset of SDs was usually associated with larger stimulus-induced accumulation of extracellular potassium, and preceded by epileptiform activity, which was also observed during the recovery phase of SDs. Application of ifenprodil (3 μM), an NMDA-receptor type 2 B antagonist, blocked stimulus dependent epileptiform discharges and generation of SDs in slices from animals treated with albumin in-vivo. We suggest that BBB opening facilitates the induction of peri-infarct SDs through impaired homeostasis of K+.
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Affiliation(s)
- EG Lapilover
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
| | - K. Lippman
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
| | - S. Salar
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
| | - A. Maslarova
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
| | - JP Dreier
- Center for Stroke Research Berlin, Charité Universitätsmedizin, 10117 Berlin, Germany
- Department of Experimental Neurology, Charité Universitätsmedizin, 10117 Berlin, Germany
- Department of Neurology, Charité Universitätsmedizin, 10117 Berlin, Germany
| | - U. Heinemann
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
- Neurocure Research Center, Charité Universitätsmedizin, 13347 Berlin, Germany
| | - A. Friedman
- Institute of Neurophysiology, Charité Universitätsmedizin, 13347 Berlin, Germany
- Department of Physiology and Neurobiology, Faculty of Health Sciences and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
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IgG Leakage May Contribute to Neuronal Dysfunction in Drug-Refractory Epilepsies With Blood-Brain Barrier Disruption. J Neuropathol Exp Neurol 2012; 71:826-38. [DOI: 10.1097/nen.0b013e31826809a6] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Dedeurwaerdere S, Friedman A, Fabene PF, Mazarati A, Murashima YL, Vezzani A, Baram TZ. Finding a better drug for epilepsy: antiinflammatory targets. Epilepsia 2012; 53:1113-8. [PMID: 22691043 PMCID: PMC3389561 DOI: 10.1111/j.1528-1167.2012.03520.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
This monograph summarizes one of the sessions of the XI Workshop on Neurobiology of Epilepsy (WONOEP), and provides a critical review of the current state of the field. Speakers and discussants focused on several broad topics: (1) the coexistence of inflammatory processes encompassing several distinct signal-transduction pathways with the epileptogenic process; (2) evidence for the contribution of specific inflammatory molecules and processes to the onset and progression of epilepsy, as well as to epilepsy-related morbidities including depression; (3) the complexity and intricate cross-talk of the pathways involved in inflammation, and the discrete, often opposite roles of a given mediator in neurons versus other cell types. These complexities highlight the challenges confronting the field as it aims to define inflammatory molecules as promising targets for epilepsy prevention and treatment.
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Antioxidant roles of heme oxygenase, carbon monoxide, and bilirubin in cerebral circulation during seizures. J Cereb Blood Flow Metab 2012; 32:1024-34. [PMID: 22354150 PMCID: PMC3367218 DOI: 10.1038/jcbfm.2012.13] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Postictal cerebrovascular dysfunction is an adverse effect of seizures in newborn piglets. The brain heme oxygenase (HO) provides protection against cerebrovascular dysfunction. We investigated the contribution of reactive oxygen species (ROS) to seizure-induced vascular damage and the mechanism of HO vasoprotection. In a bicuculline model of seizures, we addressed the hypotheses: (1) seizures increase brain ROS; (2) ROS contribute to cerebral vascular dysfunction; (3) ROS initiate a vasoprotective mechanisms by activating endogenous HO; and (4) HO products have antioxidant properties. As assessed by dihydroethidium oxidation (ox-DHE), seizures increased ROS in cerebral vessels and cortical astrocytes; ox-DHE elevation was prevented by tiron and apocynin. An HO inhibitor, tin protoporphyrin, potentiated, whereas an HO-1 inducer, cobalt protoporphyrin, blocked seizure-induced increase in DHE oxidation. Heme oxygenase products carbon monoxide (CO) (CORM-A1) and bilirubin attenuated ox-DHE elevation during seizures. Antioxidants tiron and bilirubin prevented the loss of postictal cerebrovascular dilations to bradykinin, glutamate, and sodium nitroprusside. Tiron and apocynin abrogated activation of the brain HO during seizures. Overall, these data suggest that long-term adverse cerebrovascular effects of seizures are attributed to oxidative stress. On the other hand, seizure-induced ROS are required for activation of the endogenous antioxidant HO/CO/bilirubin system that alleviates oxidative stress-induced loss of postictal cerebrovascular function in piglets.
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