51
|
Lin C, Wu X, Zhou Y, Shao B, Niu X, Zhang W, Lin Y. Maternal high-fat diet programs cerebrovascular remodeling in adult rat offspring. J Cereb Blood Flow Metab 2018; 38:1954-1967. [PMID: 28914129 PMCID: PMC6259319 DOI: 10.1177/0271678x17731956] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Maternal environmental factors such as diet have consequences on later health of the offspring. We found that maternal high-fat diet (HFD) exposure renders adult offspring brain more susceptible to ischemic injury. The present study was further to investigate whether HFD consumption during rat pregnancy and lactation influences the cerebral vasculature in adult male offspring. Besides the endothelial damage observed in the transmission electron microscopy, the MCAs of offspring from fat-fed dams fed with control diet (HFD/C) also displayed increased wall thickness and media/lumen ratio, suggesting that cerebrovascular hypertrophy or hyperplasia occurs. Moreover, smaller lumen diameter and elevated myogenic tone of the MCAs over a range of intralumenal pressures indicate inward cerebrovascular remodeling in HFD/C rats, with a concomitant increase in vessel stiffness. More importantly, both wire and pressure myography demonstrated that maternal HFD intake also enhanced the MCAs contractility to ET-1, accompanied by increases in ET types A receptor (ETAR) but not B (ETBR) density in the arteries. Furthermore, ETAR antagonism but not ETBR antagonism restored maternal HFD-induced cerebrovascular dysfunction in adult offspring. Taken together, maternal diet can substantially influence adult offspring cerebrovascular health, through remodeling of both structure and function, at least partially in an ET-1 manner.
Collapse
Affiliation(s)
- ChengCheng Lin
- 1 Department of Surgery Laboratory, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - XiaoYun Wu
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - YuLei Zhou
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Bei Shao
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - XiaoTing Niu
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - WanLi Zhang
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - YuanShao Lin
- 2 Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| |
Collapse
|
52
|
Saboory E, Ghadimkhani M, Roshan-Milani S, Derafshpour L, Mohammadi S, Dindarian S, Mohammadi H. Effect of early-life inflammation and magnesium sulfate on hyperthermia-induced seizures in infant rats: Susceptibility to pentylenetetrazol-induced seizures later in life. Dev Psychobiol 2018; 61:96-106. [PMID: 30338516 DOI: 10.1002/dev.21781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/08/2018] [Accepted: 08/20/2018] [Indexed: 12/21/2022]
Abstract
This study investigated the effect of inflammation and MgSO4 pretreatment on behaviors caused by hyperthermia (HT) and the effect of these interventions on PTZ-induced seizure a week later. In this experimental study, rat pups experienced inflammation on postnatal day 10 (P10). On P18-19, the pups received either saline or MgSO4 then subjected to hyperthermia. On P25-26, PTZ-induced seizure was initiated in the rats. Neonatal inflammation increased the susceptibility to HT-induced seizure. Inflammation and HT increased the susceptibility to PTZ-induced seizure. Pretreatment with MgSO4 before hyperthermia decreased the susceptibility to both HT- and PTZ-induced seizure. Furthermore, calcium and magnesium blood levels significantly decreased compared to control rats. It can be concluded that neonatal inflammation potentiates while pretreatment with MgSO4 attenuates HT-induced seizures. Also, neonatal inflammation and HT potentiate PTZ-induced seizure initiated one week later.
Collapse
Affiliation(s)
- Ehsan Saboory
- Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran.,Department of Physiology, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Maryam Ghadimkhani
- Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran
| | - Shiva Roshan-Milani
- Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran.,Department of Physiology, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Leila Derafshpour
- Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran.,Department of Physiology, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Sedra Mohammadi
- Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
| | - Sina Dindarian
- Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
| | - Hozan Mohammadi
- Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
| |
Collapse
|
53
|
Neuroinflammation and Seizures After Pediatric Brain Injury: What a Headache! Epilepsy Curr 2018; 18:246-247. [PMID: 30254521 DOI: 10.5698/1535-7597.18.4.246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
54
|
Zhao H, Zhu C, Huang D. Microglial activation: an important process in the onset of epilepsy. Am J Transl Res 2018; 10:2877-2889. [PMID: 30323874 PMCID: PMC6176224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 07/28/2018] [Indexed: 06/08/2023]
Abstract
This study aimed to investigate the effects of microglial activation on the onset of epilepsy. Microglias cultured in vitro were stimulated with different concentrations of coriaria lactone (CL), and the effects on cell cycle and apoptosis were examined using flow cytometry. Then microglia were stimulated with 5×10-5 mol/L CL, and levels of cyclin D1 and interleukin-1β (IL-1β) mRNA were measured by fluorescence quantitative PCR; tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) in supernatant were detected by radioimmunoassay. Finally, microglia-conditioned medium (MCM) obtained after various durations of CL treatment was infused into rat lateral ventricle, and rat behavior was observed and cortical electroencephalograms (EEGs) were recorded. Immunofluorescence staining was used to measure glutamate content in the rat cerebral cortex and hippocampus. Compared with the cell cycle phase distribution in the control group, the percentage of CL-treated cultured microglia in G0/G1 phase was significantly lower, while the percentages of microglia in S phase and G2/M phases were significantly higher. CL increased the gene expression of cyclin D1 and the secretion of TNF-α and IL-1β. Epileptic seizures were induced in rats after intraventricular injection with MCM from CL-treated cells, with animals showing bilateral beard shaking and forelimb tremor. EEGs from these animals exhibited epileptiform waveforms (such as spike waves, sharp waves and spike-slow waves), and glutamate content in the cerebral cortex and hippocampus was significantly increased. CL may therefore activate microglia by promoting proliferation and upregulation of cell factor (e.g., cyclin D1, TNF-α and IL-1β) expression. We have shown that CL-treated MCM can induce the onset of epilepsy in rats in vivo, and its mechanism of action may involve the upregulation of glutamate expression. In summary, microglial activation is an important link in the pathogenesis of the onset of epilepsy.
Collapse
Affiliation(s)
- Hu Zhao
- Department of Human Anatomy, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Changgeng Zhu
- Department of Human Anatomy, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Donghui Huang
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| |
Collapse
|
55
|
Fülle L, Offermann N, Hansen JN, Breithausen B, Erazo AB, Schanz O, Radau L, Gondorf F, Knöpper K, Alferink J, Abdullah Z, Neumann H, Weighardt H, Henneberger C, Halle A, Förster I. CCL17 exerts a neuroimmune modulatory function and is expressed in hippocampal neurons. Glia 2018; 66:2246-2261. [DOI: 10.1002/glia.23507] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/14/2018] [Accepted: 06/18/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Lorenz Fülle
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Nina Offermann
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Jan Niklas Hansen
- Neuroimmunology, Center of Advanced European Studies and Research (CAESAR); Bonn Germany
| | - Björn Breithausen
- Institute of Cellular Neurosciences; University of Bonn Medical School; Bonn Germany
| | - Anna Belen Erazo
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Oliver Schanz
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Luca Radau
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Fabian Gondorf
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Konrad Knöpper
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Judith Alferink
- Department of Psychiatry; University of Münster; Münster Germany
| | - Zeinab Abdullah
- Institute of Experimental Immunology and Molecular Medicine; University of Bonn; Bonn Germany
| | - Harald Neumann
- Neural Regeneration Group, Institute of Reconstructive Neurobiology; University of Bonn; Bonn Germany
| | - Heike Weighardt
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| | - Christian Henneberger
- Institute of Cellular Neurosciences; University of Bonn Medical School; Bonn Germany
- Institute of Neurology; University College London; London United Kingdom
- German Center for Neurodegenerative Diseases (DZNE); Bonn Germany
| | - Annett Halle
- Neuroimmunology, Center of Advanced European Studies and Research (CAESAR); Bonn Germany
- German Center for Neurodegenerative Diseases (DZNE); Bonn Germany
| | - Irmgard Förster
- Immunology & Environment; Life and Medical Sciences (LIMES) Institute, University of Bonn; Bonn Germany
| |
Collapse
|
56
|
Zhu X, Li X, Zhu M, Xu K, Yang L, Han B, Huang R, Zhang A, Yao H. Metalloprotease Adam10 suppresses epilepsy through repression of hippocampal neuroinflammation. J Neuroinflammation 2018; 15:221. [PMID: 30075790 PMCID: PMC6091106 DOI: 10.1186/s12974-018-1260-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/19/2018] [Indexed: 12/16/2022] Open
Abstract
Background Mice with pilocarpine-induced temporal lobe epilepsy (TLE) are characterized by intense hippocampal neuroinflammation, a prominent pathological hallmark of TLE that is known to contribute to neuronal hyperexcitability. Recent studies indicate that Adam10, a member of a disintegrin and metalloproteinase domain-containing protein (Adam) family, has been involved in the neuroinflammation response. However, it remains unclear whether and how Adam10 modulates neuroinflammation responses in the context of an epileptic brain or whether Adam10 affects epileptogenesis via the neuroinflammation pathway. Methods Adult male C57BL/6J mice were subjected to intraperitoneal injection of pilocarpine to induce TLE. Adeno-associated viral (AAV) vectors carrying Adam10 (AAV-Adam10) or lentiviral vectors carrying short hairpin RNA, which is specific to the mouse Adam10 mRNA (shRNA-Adam10), were bilaterally injected into the hippocampus to induce overexpression or knockdown of Adam10, respectively. The specific anti-inflammatory agent minocycline was administered following status epilepticus (SE) to block hippocampal neuroinflammation. Continuous video EEG recording was performed to analyze epileptic behavior. Western blot, immunofluorescence staining, and ELISA were performed to determine Adam10 expression as well as hippocampal neuroinflammation. Results In this study, we demonstrate that overexpression of Adam10 in the hippocampus suppresses neuroinflammation and reduces seizure activity in TLE mice, whereas knockdown of Adam10 exacerbates hippocampal neuroinflammation and increases seizure activity. Furthermore, increased seizure activity in Adam10 knockdown TLE mice is dependent on hippocampal neuroinflammation. Conclusion These results suggest that Adam10 suppresses epilepsy through repression of hippocampal neuroinflammation. Our findings provide new insights into the Adam10 regulation of development of epilepsy via the neuroinflammation pathway and identify a potential therapeutic target for epilepsy.
Collapse
Affiliation(s)
- Xinjian Zhu
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China.
| | - Xiaolin Li
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Mengyi Zhu
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| | - Kangni Xu
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| | - Li Yang
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| | - Bing Han
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| | - Rongrong Huang
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| | - Aifeng Zhang
- Department of Pathology, Medical School of Southeast University, Nanjing, China
| | - Honghong Yao
- Department of Pharmacology, Medical School of Southeast University, Dingjiaqiao 87th, Nanjing, 210009, China
| |
Collapse
|
57
|
Lewis ML, Kesler M, Candy SA, Rho JM, Pittman QJ. Comorbid epilepsy in autism spectrum disorder: Implications of postnatal inflammation for brain excitability. Epilepsia 2018; 59:1316-1326. [PMID: 29858515 DOI: 10.1111/epi.14440] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/09/2018] [Indexed: 12/30/2022]
Abstract
OBJECTIVE In different cohorts, 5%-30% of individuals with autism spectrum disorder (ASD) also have epilepsy. The high co-occurrence of these disorders suggests that a common mechanistic link may exist. The underlying pathophysiology of this comorbidity remains unknown. To investigate the mechanism(s) involved in the pathogenesis of ASD and epilepsy, we developed and validated a novel mouse model that concurrently exhibits hallmark features of both disorders. METHODS We utilized inbred BTBR T+ Itpr3tf/J (BTBR) mice that exhibit the core behavioral characteristics of ASD (ie, impaired sociability, altered vocalizations, and restricted interests). BTBR mice received a lipopolysaccharide (LPS) or sterile saline injection at postnatal day (P)7, P14, or P21. Cytokine expression was analyzed for interleukin (IL)-1β, IL-10, IL-6, and tumor necrosis factor α in brain tissue of P7 and adult BTBR mice. Adult BTBR mice were behaviorally analyzed for seizure susceptibility, sociability, communication deficits, and motor stereotypies, and monitored using chronic video-electroencephalography (EEG). RESULTS Adult male and female BTBR mice treated at P7-P14 with LPS were more sensitive to pentylenetetrazol-induced seizures than saline-treated controls. ASD-like behaviors and hippocampal cytokine levels were unchanged between P7 LPS-treated BTBR mice and controls. EEG recordings from the dorsal hippocampus revealed a significant increase in number and frequency of seizures over the 4-week recording period (P60-P88) in BTBR mice postnatally treated with LPS at P7. These results indicate the presence of a comorbid epileptic phenotype in BTBR mice. SIGNIFICANCE These findings suggest that an early postnatal immune challenge can increase brain excitability in adult BTBR mice and reveal an underlying epilepsy phenotype. This novel animal model may enable the elucidation of specific molecular alterations that are associated with the concurrent presentation of ASD and epilepsy, which could facilitate the development of targeted therapies for individuals affected by this comorbidity.
Collapse
Affiliation(s)
- Megan Leigh Lewis
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Mitchell Kesler
- Departments of Pediatrics, Clinical Neurosciences, and Physiology and Pharmacology, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Sydney A Candy
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jong M Rho
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Departments of Pediatrics, Clinical Neurosciences, and Physiology and Pharmacology, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Quentin J Pittman
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| |
Collapse
|
58
|
Huang WY, Lin S, Chen HY, Chen YP, Chen TY, Hsu KS, Wu HM. NADPH oxidases as potential pharmacological targets against increased seizure susceptibility after systemic inflammation. J Neuroinflammation 2018; 15:140. [PMID: 29753328 PMCID: PMC5948699 DOI: 10.1186/s12974-018-1186-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 05/02/2018] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Systemic inflammation associated with sepsis can induce neuronal hyperexcitability, leading to enhanced seizure predisposition and occurrence. Brain microglia are rapidly activated in response to systemic inflammation and, in this activated state, release multiple cytokines and signaling factors that amplify the inflammatory response and increase neuronal excitability. NADPH oxidase (NOX) enzymes promote microglial activation through the generation of reactive oxygen species (ROS), such as superoxide anion. We hypothesized that NOX isoforms, particularly NOX2, are potential targets for prevention of sepsis-associated seizures. METHODS To reduce NADPH oxidase 2-derived ROS production, mice with deficits of NOX regulatory subunit/NOX2 organizer p47phox (p47phox-/-) or NOX2 major subunit gp91phox (gp91phox-/-) were used or the NOX2-selective inhibitor diphenyleneiodonium (DPI) was used to treat wild-type (WT) mice. Systemic inflammation was induced by intraperitoneal injection of lipopolysaccharide (LPS). Seizure susceptibility was compared among mouse groups in response to intraperitoneal injection of pentylenetetrazole (PTZ). Brain tissues were assayed for proinflammatory gene and protein expression, and immunofluorescence staining was used to estimate the proportion of activated microglia. RESULTS Increased susceptibility to PTZ-induced seizures following sepsis was significantly attenuated in gp91phox-/- and p47phox-/- mice compared with WT mice. Both gp91phox-/- and p47phox-/- mice exhibited reduced microglia activation and lower brain induction of multiple proconvulsive cytokines, including TNFα, IL-1β, IL-6, and CCL2, compared with WT mice. Administration of DPI following LPS injection significantly attenuated the increased susceptibility to PTZ-induced seizures and reduced both microglia activation and brain proconvulsive cytokine concentrations compared with vehicle-treated controls. DPI also inhibited the upregulation of gp91phox transcripts following LPS injection. CONCLUSIONS Our results indicate that NADPH oxidases contribute to the development of increased seizure susceptibility in mice after sepsis. Pharmacologic inhibition of NOX may be a promising therapeutic approach to reducing sepsis-associated neuroinflammation, neuronal hyperexcitability, and seizures.
Collapse
Affiliation(s)
- Wan-Yu Huang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Pediatrics of Kung-Ten General Hospital, Taichung City, Taiwan
| | - Shankung Lin
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Hsuan-Ying Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Ya-Ping Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Ting-Yu Chen
- Inflammation Research & Drug Development Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Kuei-Sen Hsu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
| | - Hung-Ming Wu
- Inflammation Research & 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.
| |
Collapse
|
59
|
Satb2 ablation decreases PTZ-induced seizure susceptibility and pyramidal neuronal excitability. Brain Res 2018; 1695:102-107. [PMID: 29750936 DOI: 10.1016/j.brainres.2018.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 04/11/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
Abstract
Special AT-rich sequence-binding protein 2 (Satb2) is a transcriptional regulator and people with SATB2 mutation or duplication could display epilepsy. However, whether Satb2 is related with epilepsy and its mechanisms are largely unexplored. Here we found that the expression of Satb2 was decreased following the neuronal hyperactivities. Ablation of Satb2 in mice would decrease incidence and stage of seizure induced by intraperitoneal injection of pentylenetetrazol (PTZ). At cellular levels, we found pyramidal neuronal excitability and excitatory synaptic inputs in CA1 were decreased in Satb2 mutant mice. Taking together, we proved that deletion of Satb2 in mice increased PTZ seizure threshold probably by modulating neuronal excitability.
Collapse
|
60
|
Vezzani A, Dingledine R, Rossetti AO. Immunity and inflammation in status epilepticus and its sequelae: possibilities for therapeutic application. Expert Rev Neurother 2018; 15:1081-92. [PMID: 26312647 DOI: 10.1586/14737175.2015.1079130] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Status epilepticus (SE) is a life-threatening neurological emergency often refractory to available treatment options. It is a very heterogeneous condition in terms of clinical presentation and causes, which besides genetic, vascular and other structural causes also include CNS or severe systemic infections, sudden withdrawal from benzodiazepines or anticonvulsants and rare autoimmune etiologies. Treatment of SE is essentially based on expert opinions and antiepileptic drug treatment per se seems to have no major impact on prognosis. There is, therefore, urgent need of novel therapies that rely upon a better understanding of the basic mechanisms underlying this clinical condition. Accumulating evidence in animal models highlights that inflammation ensuing in the brain during SE may play a determinant role in ongoing seizures and their long-term detrimental consequences, independent of an infection or auto-immune cause; this evidence encourages reconsideration of the treatment flow in SE patients.
Collapse
Affiliation(s)
- Annamaria Vezzani
- a 1 Department of Neuroscience, Mario Negri Institute for Pharmacological Research, Milano, Italy
| | | | | |
Collapse
|
61
|
Li TR, Jia YJ, Ma C, Qiu WY, Wang Q, Shao XQ, Lv RJ. The role of the microRNA-146a/complement factor H/interleukin-1β-mediated inflammatory loop circuit in the perpetuate inflammation of chronic temporal lobe epilepsy. Dis Model Mech 2018; 11:11/3/dmm031708. [PMID: 29590637 PMCID: PMC5897725 DOI: 10.1242/dmm.031708] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 02/19/2018] [Indexed: 01/28/2023] Open
Abstract
Increasing evidence indicates that neuroinflammation plays a crucial role in the pathogenesis of temporal lobe epilepsy (TLE). However, it is unclear how the perpetuate inflammation develops. Some recent studies have suggested the possible involvement of microRNA-146a (miR-146a) in the modulation of inflammatory signaling occurring in TLE. To understand how miR-146a modulates inflammatory signaling in TLE, we investigated the role of interleukin-1β (IL-1β), miR-146a and human complement factor H (CFH) in the perpetuate inflammation in rat models of chronic TLE and U251 cells. We found that enhancive miR-146a could upregulate the expression of IL-1β and downregulate the expression of CFH, whereas reductive miR-146a could downregulate the expression of IL-1β and upregulate the expression of CFH, in hippocampi of chronic TLE rat models. Meanwhile, enhancive miR-146a could increase the abnormal wave forms in the chronic TLE rat models. Additionally, enhancive IL-1β could feedback downregulate the expression of CFH, upregulate the expression of miR-146a and increase the abnormal wave forms in chronic TLE rat models. After CFH gene knockdown in U251 cells, enhancive miR-146a did not upregulate the expression of IL-1β. In summary, this study shows that enhancive miR-146a can upregulate the inflammatory factor IL-1β in chronic TLE by downregulating CFH, and that upregulation of IL-1β plays an important feedback-regulating role in the expression of miR-146a and CFH, forming a miR-146a–CFH–IL-1β loop circuit that initiates a cascade of inflammation and then leads to the perpetuate inflammation in TLE. Therefore, modulation of the miR-146a–CFH–IL-1β loop circuit could be a novel therapeutic target for TLE. Summary: The microRNA-146a–complement factor H–interleukin-1β loop circuit might initiate a cascade of inflammation, leading to the perpetuate inflammation in temporal lobe epilepsy.
Collapse
Affiliation(s)
- Tao-Ran Li
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University; China National Clinical Research Center for Neurological Diseases, 6 TianTanXiLi, Dongcheng District, Beijing, 100050, China.,Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, 1 East Road of JianShe, Erqi District, Zhengzhou, 450052, China
| | - Yan-Jie Jia
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University; China National Clinical Research Center for Neurological Diseases, 6 TianTanXiLi, Dongcheng District, Beijing, 100050, China.,Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, 1 East Road of JianShe, Erqi District, Zhengzhou, 450052, China
| | - Chao Ma
- Institute of Basic Medical Sciences, Neuroscience Center, Chinese Academy of Medical Sciences, Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Peking Union Medical College,1 Shuai Fu Yuan, Dongcheng District, Beijing, 100730, China
| | - Wen-Ying Qiu
- Institute of Basic Medical Sciences, Neuroscience Center, Chinese Academy of Medical Sciences, Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Peking Union Medical College,1 Shuai Fu Yuan, Dongcheng District, Beijing, 100730, China
| | - Qun Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University; China National Clinical Research Center for Neurological Diseases, 6 TianTanXiLi, Dongcheng District, Beijing, 100050, China
| | - Xiao-Qiu Shao
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University; China National Clinical Research Center for Neurological Diseases, 6 TianTanXiLi, Dongcheng District, Beijing, 100050, China
| | - Rui-Juan Lv
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University; China National Clinical Research Center for Neurological Diseases, 6 TianTanXiLi, Dongcheng District, Beijing, 100050, China
| |
Collapse
|
62
|
Ambrogini P, Albertini MC, Betti M, Galati C, Lattanzi D, Savelli D, Di Palma M, Saccomanno S, Bartolini D, Torquato P, Ruffolo G, Olivieri F, Galli F, Palma E, Minelli A, Cuppini R. Neurobiological Correlates of Alpha-Tocopherol Antiepileptogenic Effects and MicroRNA Expression Modulation in a Rat Model of Kainate-Induced Seizures. Mol Neurobiol 2018; 55:7822-7838. [PMID: 29468563 PMCID: PMC6132771 DOI: 10.1007/s12035-018-0946-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 01/31/2018] [Indexed: 12/19/2022]
Abstract
Seizure-triggered maladaptive neural plasticity and neuroinflammation occur during the latent period as a key underlying event in epilepsy chronicization. Previously, we showed that α-tocopherol (α-T) reduces hippocampal neuroglial activation and neurodegeneration in the rat model of kainic acid (KA)-induced status epilepticus (SE). These findings allowed us to postulate an antiepileptogenic potential for α-T in hippocampal excitotoxicity, in line with clinical evidence showing that α-T improves seizure control in drug-resistant patients. To explore neurobiological correlates of the α-T antiepileptogenic role, rats were injected with such vitamin during the latent period starting right after KA-induced SE, and the effects on circuitry excitability, neuroinflammation, neuronal death, and microRNA (miRNA) expression were investigated in the hippocampus. Results show that in α-T-treated epileptic rats, (1) the number of population spikes elicited by pyramidal neurons, as well as the latency to the onset of epileptiform-like network activity recover to control levels; (2) neuronal death is almost prevented; (3) down-regulation of claudin, a blood-brain barrier protein, is fully reversed; (4) neuroinflammation processes are quenched (as indicated by the decrease of TNF-α, IL-1β, GFAP, IBA-1, and increase of IL-6); (5) miR-146a, miR-124, and miR-126 expression is coherently modulated in hippocampus and serum by α-T. These findings support the potential of a timely intervention with α-T in clinical management of SE to reduce epileptogenesis, thus preventing chronic epilepsy development. In addition, we suggest that the analysis of miRNA levels in serum could provide clinicians with a tool to evaluate disease evolution and the efficacy of α-T therapy in SE.
Collapse
Affiliation(s)
- Patrizia Ambrogini
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy.
| | - Maria Cristina Albertini
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Michele Betti
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Claudia Galati
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Davide Lattanzi
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - David Savelli
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Michael Di Palma
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Stefania Saccomanno
- Department of Gastroenterology, Marche Polytechnic University, Ancona, Italy
| | - Desirée Bartolini
- Department of Pharmaceutical Sciences, University of Perugia, Perugia, Italy
| | - Pierangelo Torquato
- Department of Pharmaceutical Sciences, University of Perugia, Perugia, Italy
| | - Gabriele Ruffolo
- Department of Physiology and Pharmacology, University of Rome Sapienza, Rome, Italy
| | - Fabiola Olivieri
- Department of Molecular and Clinical Sciences, Marche Polytechnic University, Ancona, Italy.,Center of Clinical Pathology and Innovative Therapy, INRCA-IRCCS, Ancona, Italy
| | - Francesco Galli
- Department of Pharmaceutical Sciences, University of Perugia, Perugia, Italy
| | - Eleonora Palma
- Department of Physiology and Pharmacology, University of Rome Sapienza, Rome, Italy
| | - Andrea Minelli
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| | - Riccardo Cuppini
- Department of Biomolecular Sciences, Section of Physiology, University of Urbino Carlo Bo, I-61029, Urbino, Italy
| |
Collapse
|
63
|
Perinatal Immune Activation Produces Persistent Sleep Alterations and Epileptiform Activity in Male Mice. Neuropsychopharmacology 2018; 43:482-491. [PMID: 28984294 PMCID: PMC5770773 DOI: 10.1038/npp.2017.243] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 09/17/2017] [Accepted: 10/02/2017] [Indexed: 01/03/2023]
Abstract
Increasing evidence suggests a role for inflammation in neuropsychiatric conditions, including autism spectrum disorder (ASD). Previous work in rodents has established that immune activation during critical developmental periods can cause phenotypes that reproduce core features of ASD, including decreased social interaction, aberrant communication, and increased repetitive behavior. In humans, ASD is frequently associated with comorbid medical conditions including sleep disorders, motor hyperactivity, and seizures. Here we use a 'two-hit' immune-activation paradigm to determine whether perinatal immune activation can also produce these comorbid features in mice. In this paradigm, we treated timed-pregnant mice with polyinosinic:polycytidylic acid (Poly I:C), which simulates a viral infection, on gestational day 12.5 according to an established maternal immune activation regimen. A subset of the offspring also received a second 'hit' of lipopolysaccharide (LPS), which simulates a bacterial infection, on postnatal day 9. At 6 weeks of age, mice were implanted with wireless telemetry transmitters that enabled continuous measurements of electroencephalography (EEG), electromyography (EMG), locomotor activity, and subcutaneous temperature. Effects at 7 and 12 weeks of age were compared. Both prenatal Poly I:C and postnatal LPS produced changes in locomotor activity and temperature patterns, increases in slow-wave sleep, and shifts in EEG spectral power, several of which persisted at 12 weeks of age. Postnatal LPS also produced persistent increases in spontaneous bursts of epileptiform activity (spike-wave discharges) that occurred predominantly during sleep. Our findings demonstrate that early-life immune activation can lead to long-lasting physiologic perturbations that resemble medical comorbidities often seen in ASD and other neuropsychiatric conditions.
Collapse
|
64
|
Walker DJ, Spencer KA. Glucocorticoid programming of neuroimmune function. Gen Comp Endocrinol 2018; 256:80-88. [PMID: 28728884 DOI: 10.1016/j.ygcen.2017.07.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 07/13/2017] [Accepted: 07/16/2017] [Indexed: 01/15/2023]
Abstract
Throughout life physiological systems strive to maintain homeostasis and these systems are susceptible to exposure to maternal or environmental perturbations, particularly during embryonic development. In some cases, these perturbations may influence genetic and physiological processes that permanently alter the functioning of these physiological systems; a process known as developmental programming. In recent years, the neuroimmune system has garnered attention for its fundamental interactions with key hormonal systems, such as the hypothalamic pituitary adrenal (HPA) axis. The ultimate product of this axis, the glucocorticoid hormones, play a key role in modulating immune responses within the periphery and the CNS as part of the physiological stress response. It is well-established that elevated glucocorticoids induced by developmental stress exert profound short and long-term physiological effects, yet there is relatively little information of how these effects are manifested within the neuroimmune system. Pre and post-natal periods are prime candidates for manipulation in order to uncover the physiological mechanisms that underlie glucocorticoid programming of neuroimmune responses. Understanding the potential programming role of glucocorticoids may be key in uncovering vulnerable windows of CNS susceptibility to stressful experiences during embryonic development and improve our use of glucocorticoids as therapeutics in the treatment of neurodegenerative diseases.
Collapse
Affiliation(s)
- David J Walker
- School of Psychology & Neuroscience, University of St Andrews, Fife KY16 9JP, United Kingdom.
| | - Karen A Spencer
- School of Psychology & Neuroscience, University of St Andrews, Fife KY16 9JP, United Kingdom
| |
Collapse
|
65
|
Shaw CA. Aluminum as a CNS and Immune System Toxin Across the Life Span. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1091:53-83. [DOI: 10.1007/978-981-13-1370-7_4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
|
66
|
Abstract
Until a decade ago, epilepsy research had focused mainly on alterations of neuronal activities and excitability. Such neurocentric emphasis has neglected the role of glia and involvement of inflammation in the pathogenesis of epilepsy. It is becoming clear that immune and inflammatory reactions do occur in the brain despite the brain's lack of conventional lymphatic drainage and graft acceptance and the presence of vascular brain barrier that tightly regulates infiltration of blood monocytes and lymphocytes. The critical roles of brain-resident immune mediators and of brain-infiltrating peripheral leukocytes are increasingly recognized. Inflammatory processes, including activation of microglia and astrocytes and production of proinflammatory cytokines and related molecules, occur in human epilepsy as well as in experimental models of epilepsy. Immune mechanism that underlies evolution of drug-resistant epilepsy and epileptic encephalopathy represents a new target and will aid in development of novel immunotherapeutic drugs and therapies against the key constituents in immune pathways.
Collapse
Affiliation(s)
- Sookyong Koh
- 1 Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
| |
Collapse
|
67
|
Volumetric response of the adult brain to seizures depends on the developmental stage when systemic inflammation was induced. Epilepsy Behav 2018; 78:280-287. [PMID: 29128467 DOI: 10.1016/j.yebeh.2017.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Revised: 09/15/2017] [Accepted: 09/15/2017] [Indexed: 01/07/2023]
Abstract
Inflammation has detrimental influences on the developing brain including triggering the epileptogenesis. On the other hand, seizure episodes may induce inflammatory processes and further increase of brain excitability. The present study focuses on the problem whether transitory systemic inflammation during developmental period may have critical importance to functional and/or structural features of the adult brain. An inflammatory status was induced with lipopolysaccharide (LPS) in 6- or 30-day-old rats. Two-month-old rats which experienced the inflammation and untreated controls received injections of pilocarpine, and the intensity of their seizure behavior was rated during a 6-hour period. Three days thereafter, the animals were perfused; their brains were postfixed and subjected to magnetic resonance imaging (MRI) scans. Then, volumes of the brain and of its main regions were assessed. LPS injections alone performed at different developmental stages led to different changes in the volume of adult brain and also to different susceptibility to seizures induced in adulthood. Moreover, the LPS pretreatments modified different volumetric responses of the brain and of its regions to seizures. The responses showed strong inverse correlations with the intensity of seizures but exclusively in rats treated with LPS on postnatal day 30. It could be concluded that generalized inflammation elicited at developmental stages may have strong age-dependent effects on the adult brain regarding not only its susceptibility to action of a seizuregenic agent but also its volumetric reactivity to seizures.
Collapse
|
68
|
Chi B, Wang S, Bi S, Qin W, Wu D, Luo Z, Gui S, Wang D, Yin X, Wang F. Effects of ganoderic acid A on lipopolysaccharide-induced proinflammatory cytokine release from primary mouse microglia cultures. Exp Ther Med 2017; 15:847-853. [PMID: 29399089 PMCID: PMC5772755 DOI: 10.3892/etm.2017.5472] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 08/24/2017] [Indexed: 01/13/2023] Open
Abstract
For several thousand years, Ganoderma lucidum (Ling-Zhi in Chinese and Reishi in Japanese) has been widely used as a traditional medication for the prevention and treatment of various diseases in Asia. Its major biologically active components, ganoderic acids (GAs), exhibit significant medicinal value due to their anti-inflammatory effects. Dysregulation of microglial function may cause seizures or promote epileptogenesis through release of proinflammatory cytokines, including interleukin (IL)-1β, IL-6 and tumor necrosis factor (TNF)-α. At present, only little information is available on the effects of GAs on microglia-mediated inflammation in vitro and/or in vivo. The present study aimed to investigate the role of GA-A on microglia-mediated inflammation in vitro. In addition, the effect of GA-A on lipopolysaccharide (LPS)-evoked alterations in mitochondrial metabolic activity of microglia was evaluated. The results of the present study demonstrated that GA-A significantly decreased LPS-induced IL-1β, IL-6 and TNF-α release from mouse-derived primary cortical microglial cells in a concentration-dependent manner. GA-A treatment reduced LPS-induced expression of nuclear factor (NF)-κB (p65) and its inhibitor, demonstrating that non-toxic suppression of IL-1β, IL-6 and TNF-α production by GA-A is, at least in part, due to suppression of the NF-κB signaling pathway. In addition, the LPS-induced stimulation of mitochondrial activity of microglial cells was abolished by co-treatment with GA-A. Thus, GA-A treatment may be a potential therapeutic strategy for epilepsy prevention by suppressing microglia-derived proinflammatory mediators.
Collapse
Affiliation(s)
- Baojin Chi
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China.,Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Shuqiu Wang
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Sheng Bi
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Wenbo Qin
- Department of Urology, The Second Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
| | - Dongmei Wu
- Material College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Zhenguo Luo
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Shiliang Gui
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Dongwei Wang
- Department of Urology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang 154003, P.R. China
| | - Xingzhong Yin
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| | - Fangfang Wang
- Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
| |
Collapse
|
69
|
Inhibition of IL-1β Signaling Normalizes NMDA-Dependent Neurotransmission and Reduces Seizure Susceptibility in a Mouse Model of Creutzfeldt-Jakob Disease. J Neurosci 2017; 37:10278-10289. [PMID: 28924012 DOI: 10.1523/jneurosci.1301-17.2017] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/31/2017] [Accepted: 08/23/2017] [Indexed: 11/21/2022] Open
Abstract
Creutzfeldt-Jakob disease (CJD) is a neurodegenerative disorder caused by prion protein (PrP) misfolding, clinically recognized by cognitive and motor deficits, electroencephalographic abnormalities, and seizures. Its neurophysiological bases are not known. To assess the potential involvement of NMDA receptor (NMDAR) dysfunction, we analyzed NMDA-dependent synaptic plasticity in hippocampal slices from Tg(CJD) mice, which model a genetic form of CJD. Because PrP depletion may result in functional upregulation of NMDARs, we also analyzed PrP knock-out (KO) mice. Long-term potentiation (LTP) at the Schaffer collateral-commissural synapses in the CA1 area of ∼100-d-old Tg(CJD) mice was comparable to that of wild-type (WT) controls, but there was an inversion of metaplasticity, with increased GluN2B phosphorylation, which is indicative of enhanced NMDAR activation. Similar but less marked changes were seen in PrP KO mice. At ∼300 d of age, the magnitude of LTP increased in Tg(CJD) mice but decreased in PrP KO mice, indicating divergent changes in hippocampal synaptic responsiveness. Tg(CJD) but not PrP KO mice were intrinsically more susceptible than WT controls to focal hippocampal seizures induced by kainic acid. IL-1β-positive astrocytes increased in the Tg(CJD) hippocampus, and blocking IL-1 receptor signaling restored normal synaptic responses and reduced seizure susceptibility. These results indicate that alterations in NMDA-dependent glutamatergic transmission in Tg(CJD) mice do not depend solely on PrP functional loss. Moreover, astrocytic IL-1β plays a role in the enhanced synaptic responsiveness and seizure susceptibility, suggesting that targeting IL-1β signaling may offer a novel symptomatic treatment for CJD.SIGNIFICANCE STATEMENT Dementia and myoclonic jerks develop in individuals with Creutzfeldt-Jakob disease (CJD), an incurable brain disorder caused by alterations in prion protein structure. These individuals are prone to seizures and have high brain levels of the inflammatory cytokine IL-1β. Here we show that blocking IL-1β receptors with anakinra, the human recombinant form of the endogenous IL-1 receptor antagonist used to treat rheumatoid arthritis, normalizes hippocampal neurotransmission and reduces seizure susceptibility in a CJD mouse model. These results link neuroinflammation to defective neurotransmission and the enhanced susceptibility to seizures in CJD and raise the possibility that targeting IL-1β with clinically available drugs may be beneficial for symptomatic treatment of the disease.
Collapse
|
70
|
Li D, Tomljenovic L, Li Y, Shaw CA. RETRACTED: Subcutaneous injections of aluminum at vaccine adjuvant levels activate innate immune genes in mouse brain that are homologous with biomarkers of autism. J Inorg Biochem 2017; 177:39-54. [PMID: 28923356 DOI: 10.1016/j.jinorgbio.2017.08.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 08/30/2017] [Accepted: 08/31/2017] [Indexed: 01/11/2023]
Affiliation(s)
- Dan Li
- Dept. of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Lucija Tomljenovic
- Dept. of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Yongling Li
- Dept. of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Christopher A Shaw
- Dept. of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada; Program in Experimental Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Program in Neuroscience, University of British Columbia, Vancouver, British Columbia, Canada.
| |
Collapse
|
71
|
Models of progressive neurological dysfunction originating early in life. Prog Neurobiol 2017; 155:2-20. [DOI: 10.1016/j.pneurobio.2015.10.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 09/11/2015] [Accepted: 10/11/2015] [Indexed: 01/01/2023]
|
72
|
Cerri C, Caleo M, Bozzi Y. Chemokines as new inflammatory players in the pathogenesis of epilepsy. Epilepsy Res 2017; 136:77-83. [PMID: 28780154 DOI: 10.1016/j.eplepsyres.2017.07.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 07/13/2017] [Accepted: 07/25/2017] [Indexed: 12/22/2022]
Abstract
A large series of clinical and experimental studies supports a link between inflammation and epilepsy, indicating that inflammatory processes within the brain are important contributors to seizure recurrence and precipitation. Systemic inflammation can precipitate seizures in children suffering from epileptic encephalopathies, and hallmarks of a chronic inflammatory state have been found in patients with temporal lobe epilepsy. Research performed on animal models of epilepsy further corroborates the idea that seizures upregulate inflammatory mediators, which in turn may enhance brain excitability and neuronal degeneration. Several inflammatory molecules and their signaling pathways have been implicated in epilepsy. Among these, the chemokine pathway has increasingly gained attention. Chemokines are small cytokines secreted by blood cells, which act as chemoattractants for leukocyte migration. Recent studies indicate that chemokines and their receptors are also produced by brain cells, and are involved in various neurological disorders including epilepsy. In this review, we will focus on a subset of pro-inflammatory chemokines (namely CCL2, CCL3, CCL5, CX3CL1) and their receptors, and their increasingly recognized role in seizure control.
Collapse
Affiliation(s)
- Chiara Cerri
- CNR Neuroscience Institute, via G. Moruzzi 1, 56124, Pisa, Italy; Fondazione Umberto Veronesi, Piazza Velasca 5, 20122 Milano, Italy.
| | - Matteo Caleo
- CNR Neuroscience Institute, via G. Moruzzi 1, 56124, Pisa, Italy.
| | - Yuri Bozzi
- CNR Neuroscience Institute, via G. Moruzzi 1, 56124, Pisa, Italy; Neurodevelopmental Disorders Research Group, Centre for Mind/Brain Sciences, University of Trento, via Sommarive 9, 38123 Povo, Trento, Italy.
| |
Collapse
|
73
|
Interleukin-1 Receptor in Seizure Susceptibility after Traumatic Injury to the Pediatric Brain. J Neurosci 2017; 37:7864-7877. [PMID: 28724747 DOI: 10.1523/jneurosci.0982-17.2017] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 06/29/2017] [Accepted: 07/07/2017] [Indexed: 12/19/2022] Open
Abstract
Epilepsy after pediatric traumatic brain injury (TBI) is associated with poor quality of life. This study aimed to characterize post-traumatic epilepsy in a mouse model of pediatric brain injury, and to evaluate the role of interleukin-1 (IL-1) signaling as a target for pharmacological intervention. Male mice received a controlled cortical impact or sham surgery at postnatal day 21, approximating a toddler-aged child. Mice were treated acutely with an IL-1 receptor antagonist (IL-1Ra; 100 mg/kg, s.c.) or vehicle. Spontaneous and evoked seizures were evaluated from video-EEG recordings. Behavioral assays tested for functional outcomes, postmortem analyses assessed neuropathology, and brain atrophy was detected by ex vivo magnetic resonance imaging. At 2 weeks and 3 months post-injury, TBI mice showed an elevated seizure response to the convulsant pentylenetetrazol compared with sham mice, associated with abnormal hippocampal mossy fiber sprouting. A robust increase in IL-1β and IL-1 receptor were detected after TBI. IL-1Ra treatment reduced seizure susceptibility 2 weeks after TBI compared with vehicle, and a reduction in hippocampal astrogliosis. In a chronic study, IL-1Ra-TBI mice showed improved spatial memory at 4 months post-injury. At 5 months, most TBI mice exhibited spontaneous seizures during a 7 d video-EEG recording period. At 6 months, IL-1Ra-TBI mice had fewer evoked seizures compared with vehicle controls, coinciding with greater preservation of cortical tissue. Findings demonstrate this model's utility to delineate mechanisms underlying epileptogenesis after pediatric brain injury, and provide evidence of IL-1 signaling as a mediator of post-traumatic astrogliosis and seizure susceptibility.SIGNIFICANCE STATEMENT Epilepsy is a common cause of morbidity after traumatic brain injury in early childhood. However, a limited understanding of how epilepsy develops, particularly in the immature brain, likely contributes to the lack of efficacious treatments. In this preclinical study, we first demonstrate that a mouse model of traumatic injury to the pediatric brain reproduces many neuropathological and seizure-like hallmarks characteristic of epilepsy. Second, we demonstrate that targeting the acute inflammatory response reduces cognitive impairments, the degree of neuropathology, and seizure susceptibility, after pediatric brain injury in mice. These findings provide evidence that inflammatory cytokine signaling is a key process underlying epilepsy development after an acquired brain insult, which represents a feasible therapeutic target to improve quality of life for survivors.
Collapse
|
74
|
Mazarati AM, Lewis ML, Pittman QJ. Neurobehavioral comorbidities of epilepsy: Role of inflammation. Epilepsia 2017; 58 Suppl 3:48-56. [DOI: 10.1111/epi.13786] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/20/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Andrey M. Mazarati
- Neurology Division; Department of Pediatrics; David Geffen School of Medicine; University of California Los Angeles; Los Angeles California U.S.A
| | - Megan L. Lewis
- Department of Physiology & Pharmacology; Hotchkiss Brain Institute; University of Calgary; Calgary Alberta Canada
| | - Quentin J. Pittman
- Department of Physiology & Pharmacology; Hotchkiss Brain Institute; University of Calgary; Calgary Alberta Canada
| |
Collapse
|
75
|
Doenni VM, Song CM, Hill MN, Pittman QJ. Early-life inflammation with LPS delays fear extinction in adult rodents. Brain Behav Immun 2017; 63:176-185. [PMID: 27888073 DOI: 10.1016/j.bbi.2016.11.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/10/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022] Open
Abstract
A large body of evidence has been brought forward connecting developmental immune activation to abnormal fear and anxiety levels. Anxiety disorders have extremely high lifetime prevalence, yet susceptibility factors that contribute to their emergence are poorly understood. In this research we investigated whether an inflammatory insult early in life can alter the response to fear conditioning in adulthood. Fear learning and extinction are important and adaptive behaviors, mediated largely by the amygdala and its interconnectivity with cortico-limbic circuits. Male and female rat pups were given LPS (100μg/kg i.p.) or saline at postnatal day 14; LPS activated cFos expression in the central amygdala 2.5h after exposure, but not the basal or lateral nuclei. When tested in adulthood, acquisition of an auditory cued or contextual learned fear memory was largely unaffected as was the extinction of fear to a conditioned context. However, we detected a deficit in auditory fear extinction in male and female rats that experienced early-life inflammation, such that there is a significant delay in fear extinction processes resulting in more sustained fear behaviors in response to a conditioned cue. This response was specific to extinction training and did not persist into extinction recall. The effect could not be explained by differences in pain threshold (unaltered) or in baseline anxiety, which was elevated in adolescent females only and unaltered in adolescent males and adult males and females. This research provides further evidence for the involvement of the immune system during development in the shaping of fear and anxiety related behaviors.
Collapse
Affiliation(s)
- V M Doenni
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Department of Neuroscience, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - C M Song
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - M N Hill
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - Q J Pittman
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| |
Collapse
|
76
|
Setkowicz Z, Kosonowska E, Janeczko K. Inflammation in the developing rat modulates astroglial reactivity to seizures in the mature brain. J Anat 2017; 231:366-379. [PMID: 28597918 DOI: 10.1111/joa.12636] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2017] [Indexed: 11/29/2022] Open
Abstract
Astrocytes participate in neuronal development and excitability, and produce factors enhancing or suppressing inflammatory processes occurring due to neurodegenerative diseases, such as epilepsy. Seizures, in turn, trigger the release of inflammatory mediators, causing structural and functional changes in the brain. Therefore, it appears reasonable to determine whether generalized inflammation at developmental periods can affect astrocyte reactivity to epileptic seizures occurring in the adult brain. Lipopolysaccharide (LPS) was injected in 6- or 30-day-old rats (P6 or P30, respectively). At the age of 2 months, seizures were induced, and pilocarpine and morphological changes of astrocytes located within the hippocampal formation were assessed. Additionally, expression of glial fibrillary acidic protein (GFAP), glutamine synthetase (GS), aquaporin 4 (AQP4), and inwardly rectifying potassium channel Kir 4.1 (Kir4.1) was determined using Western blots. The animal group given LPS on P6 displayed maximal susceptibility to pilocarpine-induced seizures, significantly higher than the group that received LPS on P30. In the immunohistologically examined hippocampal formation, the GFAP-immunoreactive area was not affected by LPS alone. However, it was reduced following seizures in naïve controls but not in LPS-pretreated rats. Increases in the ramification of astrocytic processes were detected only in adult rats given LPS on P30, not on P6. Seizures abolished the effects. Following seizures, the process ramification showed no significant change in the two LPS-treated rat groups, whereas it was significantly reduced in the dentate gyrus of LPS-untreated controls. Glial fibrillary acidic protein (GFAP) expression showed no changes induced with LPS alone and rose slightly after seizures. AQP4 content was lower in rats given LPS on P6 and was seizure-resistant in the two LPS-treated groups, contrary to a decrease in untreated controls. GS expression was not affected by LPS treatments and was reduced after seizures without an intergroup difference. Kir4.1 underwent highly significant increases in all groups experiencing seizures, but LPS alone had no effect. It can be concluded that the generalized inflammatory status led to some important changes in astrocytes reflected, in part at least by permanent modifications of their morphology and molecular profile. Moreover, the previously experienced inflammation prevented the cells from much stronger changes in response to seizures observed in adult untreated controls. The obtained results point to a link between the activation of astrocytes by transient systemic inflammation occurring during the developmental period and their subsequent reactivity to seizures, which may play an important role in the functional features of the brain, including its susceptibility to seizures.
Collapse
Affiliation(s)
- Zuzanna Setkowicz
- Department of Neuroanatomy, Institute of Zoology, Jagiellonian University, Krakow, Poland
| | - Emilia Kosonowska
- Department of Neuroanatomy, Institute of Zoology, Jagiellonian University, Krakow, Poland
| | - Krzysztof Janeczko
- Department of Neuroanatomy, Institute of Zoology, Jagiellonian University, Krakow, Poland
| |
Collapse
|
77
|
Falsaperla R, Romano C, Pavone P, Vitaliti G, Yuan Q, Motamed-Gorji N, Lubrano R. The Gut-brain Axis: A New Pathogenic View of Neurologic Symptoms - Description of a Pediatric Case. J Pediatr Neurosci 2017; 12:105-108. [PMID: 28553399 PMCID: PMC5437772 DOI: 10.4103/jpn.jpn_190_16] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Recent literature data have given emphasis to the relationship between gastrointestinal (GI) disorders and neurologic diseases, underlying a new pathogenic pathway: The so-called “gut–brain axis.” Herein, authors report a case of a 10-month-old male infant, admitted for drug-resistant epilepsy, associated with irritable behavior and GI discomfort, secondary to cow's milk protein allergy. Seizures were described by parents as upward eye movements that were mostly deviated to the right and were associated with slight extension of his neck. They were infrequent at first, but had increased gradually during the course of 3 days (up to 15–20 times/day). No anticonvulsant therapy was effective. Only a cow's milk protein-free diet, accidentally started during a gastroenteritis episode, was effective in stopping seizures. Our case underlines the peculiar vulnerability of the blood–brain barrier under 1 year of age, for which children of this age group experience neurologic manifestations during episodes of systemic inflammation.
Collapse
Affiliation(s)
- Raffaele Falsaperla
- General Paediatrics Complex Operative Unit, Policlinico-Vittorio Emanuele University Hospital, University of Catania, Catania, Italy
| | - Catia Romano
- General Paediatrics Complex Operative Unit, Policlinico-Vittorio Emanuele University Hospital, University of Catania, Catania, Italy
| | - Piero Pavone
- General Paediatrics Complex Operative Unit, Policlinico-Vittorio Emanuele University Hospital, University of Catania, Catania, Italy
| | - Giovanna Vitaliti
- General Paediatrics Complex Operative Unit, Policlinico-Vittorio Emanuele University Hospital, University of Catania, Catania, Italy
| | - Qian Yuan
- Clinical Director, Food Allergy Center, Pediatrician, Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Department of Pediatrics, Harvard Medical School, Boston, USA
| | | | - Riccardo Lubrano
- Pediatric Nephrology Operative Unit, La Sapienza University of Rome, Rome, Italy
| |
Collapse
|
78
|
Hippocampal infusion of lipopolysaccharide induces immune responses and results in seizures in rats. Neuroreport 2017; 28:200-207. [DOI: 10.1097/wnr.0000000000000744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
79
|
Shandra O, Moshé SL, Galanopoulou AS. Inflammation in Epileptic Encephalopathies. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2017; 108:59-84. [PMID: 28427564 DOI: 10.1016/bs.apcsb.2017.01.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
West syndrome (WS) is an infantile epileptic encephalopathy that manifests with infantile spasms (IS), hypsarrhythmia (in ~60% of infants), and poor neurodevelopmental outcomes. The etiologies of WS can be structural-metabolic pathologies (~60%), genetic (12%-15%), or of unknown origin. The current treatment options include hormonal treatment (adrenocorticotropic hormone and high-dose steroids) and the GABA aminotransferase inhibitor vigabatrin, while ketogenic diet can be given as add-on treatment in refractory IS. There is a need to identify new therapeutic targets and more effective treatments for WS. Theories about the role of inflammatory pathways in the pathogenesis and treatment of WS have emerged, being supported by both clinical and preclinical data from animal models of WS. Ongoing advances in genetics have revealed numerous genes involved in the pathogenesis of WS, including genes directly or indirectly involved in inflammation. Inflammatory pathways also interact with other signaling pathways implicated in WS, such as the neuroendocrine pathway. Furthermore, seizures may also activate proinflammatory pathways raising the possibility that inflammation can be a consequence of seizures and epileptogenic processes. With this targeted review, we plan to discuss the evidence pro and against the following key questions. Does activation of inflammatory pathways in the brain cause epilepsy in WS and does it contribute to the associated comorbidities and progression? Can activation of certain inflammatory pathways be a compensatory or protective event? Are there interactions between inflammation and the neuroendocrine system that contribute to the pathogenesis of WS? Does activation of brain inflammatory signaling pathways contribute to the transition of WS to Lennox-Gastaut syndrome? Are there any lead candidates or unexplored targets for future therapy development for WS targeting inflammation?
Collapse
Affiliation(s)
- Oleksii Shandra
- Laboratory of Developmental Epilepsy, Albert Einstein College of Medicine, Bronx, NY, United States
| | - Solomon L Moshé
- Laboratory of Developmental Epilepsy, Albert Einstein College of Medicine, Bronx, NY, United States; Montefiore/Einstein Epilepsy Center, Montefiore Medical Center, Bronx, NY, United States
| | - Aristea S Galanopoulou
- Laboratory of Developmental Epilepsy, Albert Einstein College of Medicine, Bronx, NY, United States; Montefiore/Einstein Epilepsy Center, Montefiore Medical Center, Bronx, NY, United States.
| |
Collapse
|
80
|
Shimada A, Hasegawa-Ishii S. Histological Architecture Underlying Brain-Immune Cell-Cell Interactions and the Cerebral Response to Systemic Inflammation. Front Immunol 2017; 8:17. [PMID: 28154566 PMCID: PMC5243818 DOI: 10.3389/fimmu.2017.00017] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 01/05/2017] [Indexed: 11/18/2022] Open
Abstract
Although the brain is now known to actively interact with the immune system under non-inflammatory conditions, the site of cell–cell interactions between brain parenchymal cells and immune cells has been an open question until recently. Studies by our and other groups have indicated that brain structures such as the leptomeninges, choroid plexus stroma and epithelium, attachments of choroid plexus, vascular endothelial cells, cells of the perivascular space, circumventricular organs, and astrocytic endfeet construct the histological architecture that provides a location for intercellular interactions between bone marrow-derived myeloid lineage cells and brain parenchymal cells under non-inflammatory conditions. This architecture also functions as the interface between the brain and the immune system, through which systemic inflammation-induced molecular events can be relayed to the brain parenchyma at early stages of systemic inflammation during which the blood–brain barrier is relatively preserved. Although brain microglia are well known to be activated by systemic inflammation, the mechanism by which systemic inflammatory challenge and microglial activation are connected has not been well documented. Perturbed brain–immune interaction underlies a wide variety of neurological and psychiatric disorders including ischemic brain injury, status epilepticus, repeated social defeat, and neurodegenerative diseases such as Alzheimer’s disease and Parkinson’s disease. Proinflammatory status associated with cytokine imbalance is involved in autism spectrum disorders, schizophrenia, and depression. In this article, we propose a mechanism connecting systemic inflammation, brain–immune interface cells, and brain parenchymal cells and discuss the relevance of basic studies of the mechanism to neurological disorders with a special emphasis on sepsis-associated encephalopathy and preterm brain injury.
Collapse
Affiliation(s)
- Atsuyoshi Shimada
- Department of Pathology and Laboratory Medicine, Central Hospital, Aichi Human Service Center , Kasugai, Aichi , Japan
| | - Sanae Hasegawa-Ishii
- Department of Pharmacology, Pennsylvania State University College of Medicine , Hershey, PA , USA
| |
Collapse
|
81
|
Dal Ben M, Bottin C, Zanconati F, Tiribelli C, Gazzin S. Evaluation of region selective bilirubin-induced brain damage as a basis for a pharmacological treatment. Sci Rep 2017; 7:41032. [PMID: 28102362 PMCID: PMC5244479 DOI: 10.1038/srep41032] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 12/14/2016] [Indexed: 12/20/2022] Open
Abstract
The neurologic manifestations of neonatal hyperbilirubinemia in the central nervous system (CNS) exhibit high variations in the severity and appearance of motor, auditory and cognitive symptoms, which is suggestive of a still unexplained selective topography of bilirubin-induced damage. By applying the organotypic brain culture (OBC: preserving in vitro the cellular complexity, connection and architecture of the in vivo brain) technique to study hyperbilirubinemia, we mapped the regional target of bilirubin-induced damage, demonstrated a multifactorial toxic action of bilirubin, and used this information to evaluate the efficacy of drugs applicable to newborns to protect the brain. OBCs from 8-day-old rat pups showed a 2–13 fold higher sensitivity to bilirubin damage than 2-day-old preparations. The hippocampus, inferior colliculus and cerebral cortex were the only brain regions affected, presenting a mixed inflammatory-oxidative mechanism. Glutamate excitotoxicity was appreciable in only the hippocampus and inferior colliculus. Single drug treatment (indomethacin, curcumin, MgCl2) significantly improved cell viability in all regions, while the combined (cocktail) administration of the three drugs almost completely prevented damage in the most affected area (hippocampus). Our data may supports an innovative (complementary to phototherapy) approach for directly protecting the newborn brain from bilirubin neurotoxicity.
Collapse
Affiliation(s)
- Matteo Dal Ben
- Italian Liver Foundation (Fondazione Italiana Fegato), AREA Science Park, Trieste, Italy
| | - Cristina Bottin
- Department of Medical Sciences (Dipartimento di Scienze Mediche), Ospedale di Cattinara, Univestità degli Studi di Trieste, Trieste, Italy
| | - Fabrizio Zanconati
- Department of Medical Sciences (Dipartimento di Scienze Mediche), Ospedale di Cattinara, Univestità degli Studi di Trieste, Trieste, Italy
| | - Claudio Tiribelli
- Italian Liver Foundation (Fondazione Italiana Fegato), AREA Science Park, Trieste, Italy
| | - Silvia Gazzin
- Italian Liver Foundation (Fondazione Italiana Fegato), AREA Science Park, Trieste, Italy
| |
Collapse
|
82
|
Integrative Analysis of Disease Signatures Shows Inflammation Disrupts Juvenile Experience-Dependent Cortical Plasticity. eNeuro 2017; 3:eN-NWR-0240-16. [PMID: 28101530 PMCID: PMC5241709 DOI: 10.1523/eneuro.0240-16.2016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 11/01/2016] [Accepted: 11/12/2016] [Indexed: 01/04/2023] Open
Abstract
Throughout childhood and adolescence, periods of heightened neuroplasticity are critical for the development of healthy brain function and behavior. Given the high prevalence of neurodevelopmental disorders, such as autism, identifying disruptors of developmental plasticity represents an essential step for developing strategies for prevention and intervention. Applying a novel computational approach that systematically assessed connections between 436 transcriptional signatures of disease and multiple signatures of neuroplasticity, we identified inflammation as a common pathological process central to a diverse set of diseases predicted to dysregulate plasticity signatures. We tested the hypothesis that inflammation disrupts developmental cortical plasticity in vivo using the mouse ocular dominance model of experience-dependent plasticity in primary visual cortex. We found that the administration of systemic lipopolysaccharide suppressed plasticity during juvenile critical period with accompanying transcriptional changes in a particular set of molecular regulators within primary visual cortex. These findings suggest that inflammation may have unrecognized adverse consequences on the postnatal developmental trajectory and indicate that treating inflammation may reduce the burden of neurodevelopmental disorders.
Collapse
|
83
|
Webster KM, Sun M, Crack P, O'Brien TJ, Shultz SR, Semple BD. Inflammation in epileptogenesis after traumatic brain injury. J Neuroinflammation 2017; 14:10. [PMID: 28086980 PMCID: PMC5237206 DOI: 10.1186/s12974-016-0786-1] [Citation(s) in RCA: 172] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 12/28/2016] [Indexed: 01/02/2023] Open
Abstract
Background Epilepsy is a common and debilitating consequence of traumatic brain injury (TBI). Seizures contribute to progressive neurodegeneration and poor functional and psychosocial outcomes for TBI survivors, and epilepsy after TBI is often resistant to existing anti-epileptic drugs. The development of post-traumatic epilepsy (PTE) occurs in a complex neurobiological environment characterized by ongoing TBI-induced secondary injury processes. Neuroinflammation is an important secondary injury process, though how it contributes to epileptogenesis, and the development of chronic, spontaneous seizure activity, remains poorly understood. A mechanistic understanding of how inflammation contributes to the development of epilepsy (epileptogenesis) after TBI is important to facilitate the identification of novel therapeutic strategies to reduce or prevent seizures. Body We reviewed previous clinical and pre-clinical data to evaluate the hypothesis that inflammation contributes to seizures and epilepsy after TBI. Increasing evidence indicates that neuroinflammation is a common consequence of epileptic seizure activity, and also contributes to epileptogenesis as well as seizure initiation (ictogenesis) and perpetuation. Three key signaling factors implicated in both seizure activity and TBI-induced secondary pathogenesis are highlighted in this review: high-mobility group box protein-1 interacting with toll-like receptors, interleukin-1β interacting with its receptors, and transforming growth factor-β signaling from extravascular albumin. Lastly, we consider age-dependent differences in seizure susceptibility and neuroinflammation as mechanisms which may contribute to a heightened vulnerability to epileptogenesis in young brain-injured patients. Conclusion Several inflammatory mediators exhibit epileptogenic and ictogenic properties, acting on glia and neurons both directly and indirectly influence neuronal excitability. Further research is required to establish causality between inflammatory signaling cascades and the development of epilepsy post-TBI, and to evaluate the therapeutic potential of pharmaceuticals targeting inflammatory pathways to prevent or mitigate the development of PTE.
Collapse
Affiliation(s)
- Kyria M Webster
- Department of Medicine (The Royal Melbourne Hospital), The University of Melbourne, Kenneth Myer Building, Melbourne Brain Centre, Royal Parade, Parkville, VIC, 3050, Australia
| | - Mujun Sun
- Department of Medicine (The Royal Melbourne Hospital), The University of Melbourne, Kenneth Myer Building, Melbourne Brain Centre, Royal Parade, Parkville, VIC, 3050, Australia
| | - Peter Crack
- Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, VIC, 3050, Australia
| | - Terence J O'Brien
- Department of Medicine (The Royal Melbourne Hospital), The University of Melbourne, Kenneth Myer Building, Melbourne Brain Centre, Royal Parade, Parkville, VIC, 3050, Australia
| | - Sandy R Shultz
- Department of Medicine (The Royal Melbourne Hospital), The University of Melbourne, Kenneth Myer Building, Melbourne Brain Centre, Royal Parade, Parkville, VIC, 3050, Australia
| | - Bridgette D Semple
- Department of Medicine (The Royal Melbourne Hospital), The University of Melbourne, Kenneth Myer Building, Melbourne Brain Centre, Royal Parade, Parkville, VIC, 3050, Australia.
| |
Collapse
|
84
|
Peña-Ortega F. Pharmacological Tools to Activate Microglia and their Possible use to Study Neural Network Patho-physiology. Curr Neuropharmacol 2017; 15:595-619. [PMID: 27697040 PMCID: PMC5543677 DOI: 10.2174/1570159x14666160928151546] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/05/2016] [Accepted: 09/26/2016] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Microglia are the resident immunocompetent cells of the CNS and also constitute a unique cell type that contributes to neural network homeostasis and function. Understanding microglia cell-signaling not only will reveal their diverse functions but also will help to identify pharmacological and non-pharmacological tools to modulate the activity of these cells. METHODS We undertook a search of bibliographic databases for peer-reviewed research literature to identify microglial activators and their cell-specificity. We also looked for their effects on neural network function and dysfunction. RESULTS We identified several pharmacological targets to modulate microglial function, which are more or less specific (with the proper control experiments). We also identified pharmacological targets that would require the development of new potent and specific modulators. We identified a wealth of evidence about the participation of microglia in neural network function and their alterations in pathological conditions. CONCLUSION The identification of specific microglia-activating signals provides experimental tools to modulate the activity of this heterogeneous cell type in order to evaluate its impact on other components of the nervous system, and it also helps to identify therapeutic approaches to ease some pathological conditions related to microglial dysfunction.
Collapse
Affiliation(s)
- Fernando Peña-Ortega
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, UNAM-Campus Juriquilla, México
| |
Collapse
|
85
|
Ambrogini P, Betti M, Galati C, Di Palma M, Lattanzi D, Savelli D, Galli F, Cuppini R, Minelli A. α-Tocopherol and Hippocampal Neural Plasticity in Physiological and Pathological Conditions. Int J Mol Sci 2016; 17:E2107. [PMID: 27983697 PMCID: PMC5187907 DOI: 10.3390/ijms17122107] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 12/01/2016] [Accepted: 12/09/2016] [Indexed: 12/25/2022] Open
Abstract
Neuroplasticity is an "umbrella term" referring to the complex, multifaceted physiological processes that mediate the ongoing structural and functional modifications occurring, at various time- and size-scales, in the ever-changing immature and adult brain, and that represent the basis for fundamental neurocognitive behavioral functions; in addition, maladaptive neuroplasticity plays a role in the pathophysiology of neuropsychiatric dysfunctions. Experiential cues and several endogenous and exogenous factors can regulate neuroplasticity; among these, vitamin E, and in particular α-tocopherol (α-T), the isoform with highest bioactivity, exerts potent effects on many plasticity-related events in both the physiological and pathological brain. In this review, the role of vitamin E/α-T in regulating diverse aspects of neuroplasticity is analyzed and discussed, focusing on the hippocampus, a brain structure that remains highly plastic throughout the lifespan and is involved in cognitive functions. Vitamin E-mediated influences on hippocampal synaptic plasticity and related cognitive behavior, on post-natal development and adult hippocampal neurogenesis, as well as on cellular and molecular disruptions in kainate-induced temporal seizures are described. Besides underscoring the relevance of its antioxidant properties, non-antioxidant functions of vitamin E/α-T, mainly involving regulation of cell signaling molecules and their target proteins, have been highlighted to help interpret the possible mechanisms underlying the effects on neuroplasticity.
Collapse
Affiliation(s)
- Patrizia Ambrogini
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Michele Betti
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Claudia Galati
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Michael Di Palma
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Davide Lattanzi
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - David Savelli
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Francesco Galli
- Department of Pharmaceutical Sciences, University of Perugia, 06123 Perugia, Italy.
| | - Riccardo Cuppini
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| | - Andrea Minelli
- Department of Biomolecular Sciences, University of Urbino, 61029 Urbino, Italy.
| |
Collapse
|
86
|
Henneberger C, Steinhäuser C. Astrocytic TLR4 at the crossroads of inflammation and seizure susceptibility. J Cell Biol 2016; 215:607-609. [PMID: 27881712 PMCID: PMC5147008 DOI: 10.1083/jcb.201611078] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 11/11/2016] [Indexed: 11/30/2022] Open
Abstract
Henneberger and Steinhäuser discuss work by Shen et al. about astrocytic TLR4’s role in promoting excitatory synaptogenesis and seizure susceptibility. Astrocytes have been implicated in epilepsy development, but their contribution is under debate. In this issue, Shen et al. (2016. J. Cell Biol.https://doi.org/10.1083/jcb.201605046) demonstrate that early postnatal inflammatory stimuli activate toll-like receptor 4 signaling in astrocytes and promote excitatory synaptogenesis, thereby increasing seizure susceptibility in young and adult mice.
Collapse
Affiliation(s)
- Christian Henneberger
- Institute of Cellular Neurosciences, University of Bonn Medical School, 53105 Bonn, Germany .,Center for Neurodegenerative Diseases (DZNE), 53175 Bonn, Germany.,Institute of Neurology, University College London, London WC1N 3BG, England, UK
| | - Christian Steinhäuser
- Institute of Cellular Neurosciences, University of Bonn Medical School, 53105 Bonn, Germany
| |
Collapse
|
87
|
Vitaliti G, Castagno E, Ricceri F, Urbino A, Di Pianella AV, Lubrano R, Caramaschi E, Prota M, Pulvirenti RM, Ajovalasit P, Signorile G, Navone C, La Bianca MR, Villani A, Corsello G, Falsaperla R. Epidemiology and diagnostic and therapeutic management of febrile seizures in the Italian pediatric emergency departments: A prospective observational study. Epilepsy Res 2016; 129:79-85. [PMID: 27930967 DOI: 10.1016/j.eplepsyres.2016.11.005] [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: 10/22/2015] [Accepted: 11/16/2016] [Indexed: 11/15/2022]
Abstract
AIM Febrile seizures (FS) involve 2-5% of the paediatric population, among which Complex FS (CFS) account for one third of accesses for FS in Emergency Departments (EDs). The aim of our study was to define the epidemiology, the clinical, diagnostic and therapeutic approach to FS and CFSs in the Italian EDs. METHODS A multicenter prospective observational study was performed between April 2014 and March 2015. Patients between 1 and 60 months of age, randomly accessing to ED for ongoing FS or reported FS at home were included. Demographic features and diagnostic-therapeutic follow-up were recorded. FS were categorized in simple (<10min), prolonged (10-30min) and status epilepticus (>30min). RESULTS The study population consisted of 268 children. Most of the children experienced simple FS (71.65%). Among the 68 (25.37%) patients with complex FS, 11 were 6-12 month-old, accounting for 45.83% of all the infants with FS in the younger age group. No therapy has been administered at home in 76.12% patients; 23.51% of them received endorectal diazepam and only 1 patient received buccal midazolam. At arrival at ED, no therapy was necessary for 70.52% patients; 50.63% received endorectal diazepam and 17.72% an i.v. bolus of midazolam. Blood tests and acid-base balanced were performed respectively in 82.09% of cases. An electroencephalogram at ED was performed in 21.64% of patients. Neuroimagings were done in 3.73% of cases. A neurologic consultation was asked for 36 patients (13.43%). CONCLUSION this is the first study assessing epidemiologic characteristics of FS in the Italian pediatric population, evidencing a higher prevalence of CFSs in children younger than 12 months of age and opening a new research scenario on the blood brain barrier vulnerability. On a national level, our study showed the need for a diagnostic standardized work-up to improve the cost/benefit ratio on CFS management.
Collapse
Affiliation(s)
- Giovanna Vitaliti
- General and Emergency Paediatrics Operative Unit, A.O.U. Policlinico-Vittorio Emanuele, University of Catania, Italy.
| | - Emanuele Castagno
- Pediatric Emergency Operative Unit, Regina Margherita Children's Hospital, A.O.U. Città della Salute e della Scienza di Torino, Turin, Italy
| | - Fulvio Ricceri
- Unit of Epidemiology, Regional Health Service, ASL TO3, Italy
| | - Antonio Urbino
- Pediatric Emergency Operative Unit, Regina Margherita Children's Hospital, A.O.U. Città della Salute e della Scienza di Torino, Turin, Italy
| | | | - Riccardo Lubrano
- Paediatric Nephrology Operative Unit, La Sapienza University of Rome, Rome Italy, Italy
| | - Elisa Caramaschi
- Department of Paediatrics, Policlinico University Hospital of Modena, Modena, Italy
| | - Maurizio Prota
- General Paediatrics Operative Unit, Sant'Eugenio Hospital, Rome Italy, Italy
| | | | | | - Giuseppe Signorile
- Paediatric Complex Operative Unit, Maria Vittoria Hospital, Torino, Italy
| | - Carla Navone
- General Paediatrics and Neonatal Operative Unit, Santa Corona Hospital, Pietra Ligure, Savona, Italy
| | - Maria Rosaria La Bianca
- General Paediatrics and Neonatal Complex Operative Unit, Vittorio Emanuele II Hospital, Castelvetrano, Trapani, Italy
| | - Alberto Villani
- Department of Pediatric, Bambino Gesù Children's Hospital, Pediatric and Infectious Diseases Unit, IRCCS, Rome, Italy
| | - Giovanni Corsello
- Department of Sciences for Health Promotion and Mother and Child Care, Pediatric Unit, University of Palermo, Palermo, Italy
| | - Raffaele Falsaperla
- General and Emergency Paediatrics Operative Unit, A.O.U. Policlinico-Vittorio Emanuele, University of Catania, Italy
| |
Collapse
|
88
|
Shen Y, Qin H, Chen J, Mou L, He Y, Yan Y, Zhou H, Lv Y, Chen Z, Wang J, Zhou YD. Postnatal activation of TLR4 in astrocytes promotes excitatory synaptogenesis in hippocampal neurons. J Cell Biol 2016; 215:719-734. [PMID: 27920126 PMCID: PMC5147000 DOI: 10.1083/jcb.201605046] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 08/30/2016] [Accepted: 10/19/2016] [Indexed: 12/22/2022] Open
Abstract
Shen et al. demonstrate a developmental role of astrocytes in shaping a predisposition to seizure generation. Activation of TLR4–MyD88–ERK1/2 signaling pathway in astrocytes during a critical postnatal period promotes excitatory synapse generation, leading to enhanced seizure susceptibility. Astrocytes are critical in synapse development, and their dysfunction in crucial developmental stages leads to serious neurodevelopmental diseases, including seizures and epilepsy. Immune challenges not only affect brain development, but also promote seizure generation and epileptogenesis, implying immune activation is one of the key factors linking seizures and epilepsy to abnormal brain development. In this study, we report that activating astrocytes by systemic lipopolysaccharide (LPS) challenges in the second postnatal week promotes excitatory synapse development, leading to enhanced seizure susceptibility in mice. Toll-like receptor 4 (TLR4) activation in astrocytes increased astrocytic extracellular signal–related kinase 1/2 (Erk1/2) and phospho-Erk1/2 levels in a myeloid differentiation primary response protein 88 (MyD88)–dependent manner. Constitutively activating Erk1/2 in astrocytes was sufficient to enhance excitatory synaptogenesis without activating TLR4. Deleting MyD88 or suppressing Erk1/2 in astrocytes rescued LPS-induced developmental abnormalities of excitatory synapses and restored the enhanced seizure sensitivity. Thus, we provide direct evidence for a developmental role of astrocytes in shaping a predisposition to seizure generation.
Collapse
Affiliation(s)
- Yi Shen
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Huaping Qin
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Juan Chen
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Lingyan Mou
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Yang He
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Yixiu Yan
- Department of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Hang Zhou
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China.,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| | - Ya Lv
- Department of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Zhong Chen
- Department of Pharmacology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Junlu Wang
- Department of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Yu-Dong Zhou
- Department of Neurobiology, Institute of Neuroscience, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China .,Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou, 310058, China
| |
Collapse
|
89
|
Doenni VM, Gray JM, Song CM, Patel S, Hill MN, Pittman QJ. Deficient adolescent social behavior following early-life inflammation is ameliorated by augmentation of anandamide signaling. Brain Behav Immun 2016; 58:237-247. [PMID: 27453335 PMCID: PMC5461973 DOI: 10.1016/j.bbi.2016.07.152] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 07/15/2016] [Accepted: 07/20/2016] [Indexed: 11/18/2022] Open
Abstract
Early-life inflammation has been shown to exert profound effects on brain development and behavior, including altered emotional behavior, stress responsivity and neurochemical/neuropeptide receptor expression and function. The current study extends this research by examining the impact of inflammation, triggered with the bacterial compound lipopolysaccharide (LPS) on postnatal day (P) 14, on social behavior during adolescence. We investigated the role that the endocannabinoid (eCB) system plays in sociability after early-life LPS. To test this, multiple cohorts of Sprague Dawley rats were injected with LPS on P14. In adolescence, rats were subjected to behavioral testing in a reciprocal social interaction paradigm as well as the open field. We quantified eCB levels in the amygdala of P14 and adolescent animals (anandamide and 2-arachidonoylglycerol) as well as adolescent amygdaloid cannabinoid receptor 1 (CB1) binding site density and the hydrolytic activity of the enzyme fatty acid amide hydrolase (FAAH), which metabolizes the eCB anandamide. Additionally, we examined the impact of FAAH inhibition on alterations in social behavior. Our results indicate that P14 LPS decreases adolescent social behavior (play and social non-play) in males and females at P40. This behavioral alteration is accompanied by decreased CB1 binding, increased anandamide levels and increased FAAH activity. Oral administration of the FAAH inhibitor PF-04457845 (1mg/kg) prior to the social interaction task normalizes LPS-induced alterations in social behavior, while not affecting social behavior in the control group. Infusion of 10ng PF-04457845 into the basolateral amygdala normalized social behavior in LPS injected females. These data suggest that alterations in eCB signaling following postnatal inflammation contribute to impairments in social behavior during adolescence and that inhibition of FAAH could be a novel target for disorders involving social deficits such as social anxiety disorders or autism.
Collapse
Affiliation(s)
- V M Doenni
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Department of Neuroscience, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - J M Gray
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - C M Song
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - S Patel
- Department of Psychiatry, Vanderbilt School of Medicine, Vanderbilt Brain Institute, Department of Molecular Physiology and Biophysics, Vanderbilt University Medical Center, 1211 Medical Center Dr, Nashville, TN 37232, United States
| | - M N Hill
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - Q J Pittman
- Hotchkiss Brain Institute, Cumming School of Medicine, Mathison Center for Mental Health, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| |
Collapse
|
90
|
Dinel AL, Rey C, Baudry C, Fressange-Mazda C, Le Ruyet P, Nadjar A, Pallet P, Joffre C, Layé S. Enriched dairy fat matrix diet prevents early life lipopolysaccharide-induced spatial memory impairment at adulthood. Prostaglandins Leukot Essent Fatty Acids 2016; 113:9-18. [PMID: 27720041 DOI: 10.1016/j.plefa.2016.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 08/22/2016] [Accepted: 08/22/2016] [Indexed: 10/21/2022]
Abstract
Polyunsaturated fatty acids (PUFAs) are essential fatty acids, which are critical for brain development and later life cognitive functions. The main brain PUFAs are docosahexaenoic acid (DHA) for the n-3 family and arachidonic acid (ARA) for the n-6 family, which are provided to the post-natal brain by breast milk or infant formula. Recently, the use of dairy lipids (DL) in replacement of vegetable lipids (VL) was revealed to potently promote the accretion of DHA in the developing brain. Brain DHA, in addition to be a key component of brain development, display potent anti-inflammatory activities, which protect the brain from adverse inflammatory events. In this work, we evaluated the protective effect of partial replacement of VL by DL, supplemented or not with DHA and ARA, on post-natal inflammation and its consequence on memory. Mice were fed with diets poor in vegetal n-3 PUFA (Def VL), balanced in vegetal n-3/n-6 PUFA (Bal VL), balanced in dairy lipids (Bal DL) or enriched in DHA and ARA (Supp VL; Supp DL) from the first day of gestation until adulthood. At post-natal day 14 (PND14), pups received a single administration of the endotoxin lipopolysaccharide (LPS) and brain cytokine expression, microglia phenotype and neurogenesis were measured. In a second set of experiments, memory and neurogenesis were measured at adulthood. Overall, our data showed that lipid quality of the diet modulates early life LPS effect on microglia phenotype, brain cytokine expression and neurogenesis at PND14 and memory at adulthood. In particular, Bal DL diet protects from the adverse effect of early life LPS exposure on PND14 neurogenesis and adult spatial memory.
Collapse
Affiliation(s)
- A L Dinel
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France.
| | - C Rey
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France; ITERG, Institut des Corps Gras, 33600 Pessac, France
| | - C Baudry
- Lactalis, R&D, Retiers F-35240, France
| | | | | | - A Nadjar
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France
| | - P Pallet
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France
| | - C Joffre
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France
| | - S Layé
- Nutrition et Neurobiologie Intégrée, INRA UMR 1286, 33076 Bordeaux, France; University of Bordeaux, Bordeaux, France
| |
Collapse
|
91
|
Abstract
UNLABELLED Epilepsy is a chronic disorder characterized by spontaneous recurrent seizures. Brain inflammation is increasingly recognized as a critical factor for seizure precipitation, but the molecular mediators of such proconvulsant effects are only partly understood. The chemokine CCL2 is one of the most elevated inflammatory mediators in patients with pharmacoresistent epilepsy, but its contribution to seizure generation remains unexplored. Here, we show, for the first time, a crucial role for CCL2 and its receptor CCR2 in seizure control. We imposed a systemic inflammatory challenge via lipopolysaccharide (LPS) administration in mice with mesial temporal lobe epilepsy. We found that LPS dramatically increased seizure frequency and upregulated the expression of many inflammatory proteins, including CCL2. To test the proconvulsant role of CCL2, we administered systemically either a CCL2 transcription inhibitor (bindarit) or a selective antagonist of the CCR2 receptor (RS102895). We found that interference with CCL2 signaling potently suppressed LPS-induced seizures. Intracerebral administration of anti-CCL2 antibodies also abrogated LPS-mediated seizure enhancement in chronically epileptic animals. Our results reveal that CCL2 is a key mediator in the molecular pathways that link peripheral inflammation with neuronal hyperexcitability. SIGNIFICANCE STATEMENT Substantial evidence points to a role for inflammation in epilepsy, but currently there is little insight as to how inflammatory pathways impact on seizure generation. Here, we examine the molecular mediators linking peripheral inflammation with seizure susceptibility in mice with mesial temporal lobe epilepsy. We show that a systemic inflammatory challenge via lipopolysaccharide administration potently enhances seizure frequency and upregulates the expression of the chemokine CCL2. Remarkably, selective pharmacological interference with CCL2 or its receptor CCR2 suppresses lipopolysaccharide-induced seizure enhancement. Thus, CCL2/CCR2 signaling plays a key role in linking systemic inflammation with seizure susceptibility.
Collapse
|
92
|
Current understanding and neurobiology of epileptic encephalopathies. Neurobiol Dis 2016; 92:72-89. [DOI: 10.1016/j.nbd.2016.03.007] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 03/01/2016] [Accepted: 03/09/2016] [Indexed: 12/25/2022] Open
|
93
|
Du Preez A, Leveson J, Zunszain PA, Pariante CM. Inflammatory insults and mental health consequences: does timing matter when it comes to depression? Psychol Med 2016; 46:2041-2057. [PMID: 27181594 PMCID: PMC4937234 DOI: 10.1017/s0033291716000672] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 03/02/2016] [Accepted: 03/02/2016] [Indexed: 12/12/2022]
Abstract
It has become widely accepted that the immune system, and specifically increased levels of inflammation, play a role in the development of depression. However, not everyone with increased inflammation develops depression, and as with all other diseases, there are risk factors that may contribute to an increased vulnerability in certain individuals. One such risk factor could be the timing of an inflammatory exposure. Here, using a combination of PubMed, EMBASE, Ovid Medline and PsycINFO, we systematically reviewed whether exposure to medically related inflammation in utero, in childhood, and in adolescence, increases the risk for depression in adulthood. Moreover, we tried to determine whether there was sufficient evidence to identify a particular time point during the developmental trajectory in which an immune insult could be more damaging. While animal research shows that early life exposure to inflammation increases susceptibility to anxiety- and depressive-like behaviour, human studies surprisingly find little evidence to support the notion that medically related inflammation in utero and in adolescence contributes to an increased risk of developing depression in later life. However, we did find an association between childhood inflammation and later life depression, with most studies reporting a significantly increased risk of depression in adults who were exposed to inflammation as children. More robust clinical research, measuring direct markers of inflammation throughout the life course, is greatly needed to expand on, and definitively address, the important research questions raised in this review.
Collapse
Affiliation(s)
- A. Du Preez
- Department of Psychological Medicine, Stress, Psychiatry and
Immunology Laboratory, Institute of Psychiatry, Psychology
& Neuroscience, King's College London,
London, UK
| | - J. Leveson
- Department of Psychological Medicine, Stress, Psychiatry and
Immunology Laboratory, Institute of Psychiatry, Psychology
& Neuroscience, King's College London,
London, UK
| | - P. A. Zunszain
- Department of Psychological Medicine, Stress, Psychiatry and
Immunology Laboratory, Institute of Psychiatry, Psychology
& Neuroscience, King's College London,
London, UK
| | - C. M. Pariante
- Department of Psychological Medicine, Stress, Psychiatry and
Immunology Laboratory, Institute of Psychiatry, Psychology
& Neuroscience, King's College London,
London, UK
| |
Collapse
|
94
|
Levetiracetam prophylaxis ameliorates seizure epileptogenesis after fluid percussion injury. Brain Res 2016; 1642:581-589. [DOI: 10.1016/j.brainres.2016.04.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 11/20/2022]
|
95
|
Toll-like receptor 4-mediated immune stress in pregnant rats activates STAT3 in the fetal brain: role of interleukin-6. Pediatr Res 2016; 79:781-7. [PMID: 25938734 DOI: 10.1038/pr.2015.86] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 01/28/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND Prenatal exposure to pathogens induces long lasting effect on brain function and plasticity. It is unclear how maternal immune stress impacts fetal brain development. Immune challenged pregnant rats induce the production of inflammatory cytokines including tumor necrosis factor (TNF)α, interleukin (IL)1β, and IL-6. IL-6 crosses the placenta but its mechanism of action on fetal brain is unclear. METHODS Gestation day 15 (GD15) rats were given a single injection of lipopolysaccharide (LPS) (100 µg/kg) in the presence or the absence of an IL-6 neutralizing antibody (IL-6Ab, 10 µg/kg). The activation of the intracellular signal of IL-6; signal transducer and activator of transcription (STAT3) and levels of glucocorticoids (GCs) were monitored in fetal brains. RESULTS LPS administration to GD15 rats significantly increased the phosphorylation levels of STAT3 in fetal brains. Such activation was blunted by IL-6Ab. LPS induced a significant rise in GCs in the plasma of dams but not in fetal brains. IL-6Ab significantly reduced LPS-induced GCs in maternal plasma. CONCLUSION Toll-like receptor 4 (TLR4)-induced activation of the maternal innate immune system affects fetal brains likely via the mobilization of IL-6/STAT3 pathway. In contrast, TLR4-stimulated maternal GCs release is less likely to play a significant role in fetal brain development.
Collapse
|
96
|
Tu YF, Wang LW, Wang ST, Yeh TF, Huang CC. Postnatal Steroids and Febrile Seizure Susceptibility in Preterm Children. Pediatrics 2016; 137:peds.2015-3404. [PMID: 27012746 DOI: 10.1542/peds.2015-3404] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/26/2016] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE To investigate risk factors, seizure characteristics, and outcomes of febrile seizure (FS) in children born very preterm. METHODS This study used a prospective registry data set of 844 preterm infants (birth weight <1500 g and gestational age <32 weeks) admitted to NICUs from 2001 to 2009 in southern Taiwan. We investigated the prevalence, risks, seizure patterns, and outcomes of FS in children aged 5 years. RESULTS Among 575 children (follow-up rate, 85.8%) followed up for 5 years, 35 (6.1%) developed FS. The FS and non-FS groups were comparable regarding their mean gestational age, birth weight, 5-minute Apgar score <6, and prenatal and postnatal complications. No difference was observed in the use of prenatal corticosteroids between the 2 groups. The FS group had a significantly higher rate of postnatal corticosteroid treatment than the non-FS group, even after adjusting for confounding factors (odds ratio, 5.4 [95% confidence interval, 1.9-15.8]; P = .006). No differences were observed in IQs or subsequent epilepsy rates between the 2 groups. Although no difference was observed in the age of FS onset or neurodevelopmental outcomes between the 2 groups, children with FS who received postnatal corticosteroid treatment had a significantly lower mean body temperature during the first FS attack compared with those who did not receive postnatal corticosteroid treatment (38.6 ± 0.4°C vs 39.2 ± 0.6°C; P = .034). CONCLUSIONS Children born very preterm have a higher rate of FS, and postnatal corticosteroid treatment was associated with FS susceptibility in these children.
Collapse
Affiliation(s)
- Yi-Fang Tu
- Department of Pediatrics, National Cheng Kung University Hospital, Institute of Clinical Medicine, and
| | - Lan-Wan Wang
- Department of Pediatrics, Chi Mei Medical Center, Tainan, Taiwan; and Departments of Pediatrics, College of Medicine, and
| | - Shan-Tair Wang
- Institute of Gerontology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Tsu-Fu Yeh
- Departments of Pediatrics, College of Medicine, and
| | - Chao-Ching Huang
- Department of Pediatrics, National Cheng Kung University Hospital, Departments of Pediatrics, College of Medicine, and Department of Pediatrics, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| |
Collapse
|
97
|
Chronic Trigeminal Nerve Stimulation Protects Against Seizures, Cognitive Impairments, Hippocampal Apoptosis, and Inflammatory Responses in Epileptic Rats. J Mol Neurosci 2016; 59:78-89. [PMID: 26973056 DOI: 10.1007/s12031-016-0736-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/04/2016] [Indexed: 12/14/2022]
Abstract
Trigeminal nerve stimulation (TNS) has recently been demonstrated effective in the treatment of epilepsy and mood disorders. Here, we aim to determine the effects of TNS on epileptogenesis, cognitive function, and the associated hippocampal apoptosis and inflammatory responses. Rats were injected with pilocarpine to produce status epilepticus (SE) and the following chronic epilepsy. After SE induction, TNS treatment was conducted for 4 consecutive weeks. A pilocarpine re-injection was then used to induce a seizure in the epileptic rats. The hippocampal neuronal apoptosis induced by seizure was assessed by TUNEL staining and inflammatory responses by immunohistochemistry and enzyme-linked immunosorbent assay (ELISA). The spontaneous recurrent seizure (SRS) number was counted through video monitoring, and the cognitive function assessed through Morris Water Maze (MWM) test. TNS treatment attenuated the SRS attacks and improved the cognitive impairment in epileptic rats. A pilocarpine re-injection resulted in less hippocampal neuronal apoptosis and reduced level of interleukin-1 beta (IL-1β), tumor necrosis factor-α (TNF-α), and microglial activation in epileptic rats with TNS treatment in comparison to the epileptic rats without TNS treatment. It is concluded that TNS treatment shortly after SE not only protected against the chronic spontaneous seizures but also improved cognitive impairments. These antiepileptic properties of TNS may be related to its attenuating effects on hippocampal apoptosis and pro-inflammatory responses.
Collapse
|
98
|
Feng B, Tang Y, Chen B, Xu C, Wang Y, Dai Y, Wu D, Zhu J, Wang S, Zhou Y, Shi L, Hu W, Zhang X, Chen Z. Transient increase of interleukin-1β after prolonged febrile seizures promotes adult epileptogenesis through long-lasting upregulating endocannabinoid signaling. Sci Rep 2016; 6:21931. [PMID: 26902320 PMCID: PMC4763292 DOI: 10.1038/srep21931] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 02/03/2016] [Indexed: 01/18/2023] Open
Abstract
It remains unclear how infantile febrile seizures (FS) enhance adult seizure susceptibility. Here we showed that the transient increase of interleukin-1β (IL-1β) after prolonged FS promoted adult seizure susceptibility, which was blocked by interleukin-1 receptor antagonist (IL-1Ra) within a critical time window. Postnatal administered IL-1β alone mimicked the effect of FS on adult seizure susceptibility. IL-1R1 knockout mice were not susceptible to adult seizure after prolonged FS or IL-1β treatment. Prolonged FS or early-life IL-1β treatment increased the expression of cannabinoid type 1 receptor (CB1R) for over 50 days, which was blocked by IL-1Ra or was absent in IL-1R1 knockout mice. CB1R antagonist, knockdown and endocannabinoid synthesis inhibitor abolished FS or IL-1β-enhanced seizure susceptibility. Thus, this work identifies a pathogenic role of postnatal IL-1β/IL-1R1 pathway and subsequent prolonged prominent increase of endocannabinoid signaling in adult seizure susceptibility following prolonged FS, and highlights IL-1R1 as a potential therapeutic target for preventing the development of epilepsy after infantile FS.
Collapse
Affiliation(s)
- Bo Feng
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Yangshun Tang
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Bin Chen
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Cenglin Xu
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Yi Wang
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Yunjian Dai
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Dengchang Wu
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China.,Department of Neurology, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, Zhejiang University, China
| | - Junmin Zhu
- Epilepsy Center, Department of Neurology, Second Affiliated Hospital, Zhejiang University, China
| | - Shuang Wang
- Epilepsy Center, Department of Neurology, Second Affiliated Hospital, Zhejiang University, China
| | - Yudong Zhou
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Liyun Shi
- Department of Basic Medical Science, Hangzhou Normal University, Hangzhou, China
| | - Weiwei Hu
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China
| | - Xia Zhang
- University of Ottawa Institute of Mental Health Research at the Royal, Department of Psychiatry, and Department of Cellular and Molecular Medicine, Ottawa K1Z 7K4, Canada
| | - Zhong Chen
- Department of Pharmacology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, School of Medicine, Zhejiang University, 310058, China.,Department of Neurology, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, Zhejiang University, China.,Epilepsy Center, Department of Neurology, Second Affiliated Hospital, Zhejiang University, China
| |
Collapse
|
99
|
Simão F, Habekost Oliveira V, Nunes ML. Enhanced susceptibility to seizures modulated by high interleukin‐1β levels during early life malnutrition. Dev Neurobiol 2016; 76:1150-9. [DOI: 10.1002/dneu.22381] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 12/13/2015] [Accepted: 01/13/2016] [Indexed: 01/21/2023]
Affiliation(s)
- Fabrício Simão
- Neuroscience LaboratoryBiomedical Research Institute, Pontifical Catholic University of Rio Grande Do Sul (PUCRS)Porto Alegre RS Brazil
| | - Victória Habekost Oliveira
- Neuroscience LaboratoryBiomedical Research Institute, Pontifical Catholic University of Rio Grande Do Sul (PUCRS)Porto Alegre RS Brazil
| | - Magda Lahourgue Nunes
- Neuroscience LaboratoryBiomedical Research Institute, Pontifical Catholic University of Rio Grande Do Sul (PUCRS)Porto Alegre RS Brazil
- School of Medicine and Brain Institute (InsCer)Pontifical Catholic University of Rio Grande Do Sul (PUCRS)Porto Alegre RS Brazil
| |
Collapse
|
100
|
Lin C, Shao B, Zhou Y, Niu X, Lin Y. Maternal high-fat diet influences stroke outcome in adult rat offspring. J Mol Endocrinol 2016; 56:101-12. [PMID: 26643911 DOI: 10.1530/jme-15-0226] [Citation(s) in RCA: 6] [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] [Accepted: 12/03/2015] [Indexed: 12/20/2022]
Abstract
Diet-induced epigenetic modifications in early life could contribute to later health problem. However, it remains to be established whether high-fat diet (HFD) consumption during pregnancy and the suckling period could predispose the offspring to stroke. The present study investigated the influence of maternal HFD on stroke outcome in adult offspring. Female Sprague-Dawley rats were fed a normal diet (5.3% fat) or a HFD (25.7% fat), just before pregnancy until the end of lactation. Male offspring were fed with the control diet or the HFD after weaning, to form four groups (control offspring fed with the control diet (C/C) or the HFD (C/HFD) and offspring of fat-fed dams fed with the control diet (HFD/C) or the HFD (HFD/HFD)). The offspring received middle cerebral artery occlusion on day 120 followed by behavioral tests (neurological deficit score, staircase-reaching test and beam-traversing test), and infarct volumes were also calculated. We found that the HFD/C rats displayed larger infarct volume and aggravated functional deficits (all P<0.05), compared with the C/C rats, indicating that maternal fat-rich diet renders the brain more susceptible to the consequences of ischemic injury. Moreover, maternal HFD offspring displayed elevated glucocorticoid concentrations following stroke, and increased glucocorticoid receptor expression. In addition, adrenalectomy reversed the effects of maternal HFD on stroke outcome when corticosterone was replaced at baseline, but not ischemic, concentrations. Furthermore, expression of brain-derived neurotrophic factor (BDNF) in the ipsilateral hippocampus was decreased in the HFD/C offspring (P<0.05), compared with the C/C offspring. Taken together, maternal diet can substantially influence adult cerebrovascular health, through the programming of central BDNF expression and the hypothalamic-pituitary-adrenal axis.
Collapse
Affiliation(s)
- ChengCheng Lin
- Department of Surgery LaboratoryFirst Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, ChinaFirst Department of Neurology, First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000, China
| | - Bei Shao
- Department of Surgery LaboratoryFirst Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, ChinaFirst Department of Neurology, First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000, China
| | - YuLei Zhou
- Department of Surgery LaboratoryFirst Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, ChinaFirst Department of Neurology, First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000, China
| | - XiaoTing Niu
- Department of Surgery LaboratoryFirst Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, ChinaFirst Department of Neurology, First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000, China
| | - YuanShao Lin
- Department of Surgery LaboratoryFirst Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, ChinaFirst Department of Neurology, First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000, China
| |
Collapse
|