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Chen Y, Hou X, Pang J, Yang F, Li A, Lin S, Lin N, Lee TH, Liu H. The role of peptidyl-prolyl isomerase Pin1 in neuronal signaling in epilepsy. Front Mol Neurosci 2022; 15:1006419. [PMID: 36304997 PMCID: PMC9592815 DOI: 10.3389/fnmol.2022.1006419] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
Epilepsy is a common symptom of many neurological disorders and can lead to neuronal damage that plays a major role in seizure-related disability. The peptidyl-prolyl isomerase Pin1 has wide-ranging influences on the occurrence and development of neurological diseases. It has also been suggested that Pin1 acts on epileptic inhibition, and the molecular mechanism has recently been reported. In this review, we primarily focus on research concerning the mechanisms and functions of Pin1 in neurons. In addition, we highlight the significance and potential applications of Pin1 in neuronal diseases, especially epilepsy. We also discuss the molecular mechanisms by which Pin1 controls synapses, ion channels and neuronal signaling pathways to modulate epileptic susceptibility. Since neurotransmitters and some neuronal signaling pathways, such as Notch1 and PI3K/Akt, are vital to the nervous system, the role of Pin1 in epilepsy is discussed in the context of the CaMKII-AMPA receptor axis, PSD-95-NMDA receptor axis, NL2/gephyrin-GABA receptor signaling, and Notch1 and PI3K/Akt pathways. The effect of Pin1 on the progression of epilepsy in animal models is discussed as well. This information will lead to a better understanding of Pin1 signaling pathways in epilepsy and may facilitate development of new therapeutic strategies.
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Affiliation(s)
- Yuwen Chen
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Xiaojun Hou
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
- Fuzhou Children’s Hospital of Fujian Medical University, Fuzhou, China
| | - Jiao Pang
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Fan Yang
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
- Department of Laboratory Medicine, Xiang’an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Angcheng Li
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Suijin Lin
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Na Lin
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Tae Ho Lee
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Hekun Liu
- Institute of Basic Medicine, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
- *Correspondence: Hekun Liu,
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Vortioxetine increases absence-like seizures in WAG/Rij rats but decreases penicillin- and pentylenetetrazole-induced seizures in Wistar rats. Epilepsy Behav 2021; 116:107797. [PMID: 33561766 DOI: 10.1016/j.yebeh.2021.107797] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/08/2021] [Accepted: 01/09/2021] [Indexed: 11/20/2022]
Abstract
AIM Depression is the major psychiatric disorder in patients with epilepsy. Vortioxetine is a novel antidepressant drug for the treatment of major depressive disorders. In the present study, effects of vortioxetine were evaluated in different experimental epilepsy models of rats. MATERIALS AND METHODS Fifty-six adult male Wistar rats and 28 WAG/Rij rats were divided into 12 groups of 7 rats each. Experiments were conducted with penicillin (500 IU, i.c.) and pentylenetetrazole models (50 mg/kg, intraperitoneally (i.p.)) in Wistar rats and genetic absence epileptic WAG/Rij rats. The vortioxetine (1, 5, or 10 mg/kg, i.p.) was evaluated in these three models. All groups were compared with their control groups. RESULTS In the penicillin-induced seizure model, 1, 5, or 10 mg/kg vortioxetine administration significantly decreased mean spike frequency. In the pentylenetetrazole-induced seizure model, 1, 5, or 10 mg/kg vortioxetine demonstrated a significant dose-dependent decrease in mean spike frequency, an increase in the latency to minor and major seizures, and a decrease in total duration of major seizure and convulsion stage. In genetic absence epileptic WAG/Rij rats, 1 mg/kg vortioxetine caused no significant alteration in the number and duration of SWDs compared to the controls, while 5 and 10 mg/kg doses of vortioxetine increased the number and duration of SWDs. Amplitude of the epileptiform activity did not change in any of the experimental epilepsy models. CONCLUSION The results of this study suggested that vortioxetine has anticonvulsant activity in penicillin- and pentylenetetrazole-induced seizure models. However, it exhibited proconvulsant activity in the absence epileptic WAG/Rij rats.
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Hung TY, Huang CW, Wu SN. High ability of zileuton ((±)-1-(1-benzo[b]thien-2-ylethyl)-1-hydroxyurea) to stimulate I K(Ca) but suppress I K(DR) and I K(M) independently of 5-lipoxygenase inhibition. Eur J Pharmacol 2020; 887:173482. [PMID: 32795513 DOI: 10.1016/j.ejphar.2020.173482] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 08/07/2020] [Accepted: 08/08/2020] [Indexed: 12/16/2022]
Abstract
Zileuton (Zyflo®) is regarded to be an inhibitor of 5-lipoxygenase. Although its effect on Ca2+-activated K+ currents has been reported, its overall ionic effects on neurons are uncertain. In whole-cell current recordings, zileuton increased the amplitude of Ca2+-activated K+ currents with an EC50 of 3.2 μM in pituitary GH3 lactotrophs. Furthermore, zileuton decreased the amplitudes of both delayed-rectifier K+ current (IK(DR)) and M-type K+ current (IK(M)). Conversely, no modification of hyperpolarization-activated cation current (Ih) was demonstrated in its presence of zileuton, although the subsequent addition of cilobradine effectively suppressed the current. In inside-out current recordings, the addition of zileuton to the bath increased the probability of large-conductance Ca2+-activated K+ (BKCa) channels; however, the subsequent addition of GAL-021 effectively reversed the stimulation of channel activity. The kinetic analyses showed an evident shortening in the slow component of mean closed time of BKCa channels in the presence of zileuton, with minimal change in mean open time or that in the fast component of mean closed time. The elevation of BKCa channels caused by zileuton was also observed in hippocampal mHippoE-14 neurons, without any modification of single-channel amplitude. In conclusion, except for its suppression of 5-lipoxygenase, our results indicate that zileuton does not exclusively act on BKCa channels, and its inhibitory effects on IK(DR) and IK(M) may combine to exert strong influence on the functional activities of electrically excitable cells in vivo.
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Affiliation(s)
- Te-Yu Hung
- Department of Pediatrics, Chi-Mei Medical Center, Tainan, Taiwan
| | - Chin-Wei Huang
- Department of Neurology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
| | - Sheng-Nan Wu
- Department of Physiology, National Cheng Kung University Medical College, Tainan, Taiwan; Institute of Basic Medical Sciences, National Cheng Kung University Medical College, Tainan, Taiwan; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung City, Taiwan.
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Huang H, Cui G, Tang H, Kong L, Wang X, Cui C, Xiao Q, Ji H. Silencing of microRNA-146a alleviates the neural damage in temporal lobe epilepsy by down-regulating Notch-1. Mol Brain 2019; 12:102. [PMID: 31796120 PMCID: PMC6892218 DOI: 10.1186/s13041-019-0523-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 11/14/2019] [Indexed: 01/16/2023] Open
Abstract
This study aimed to evaluate the specific regulatory roles of microRNA-146a (miRNA-146a) in temporal lobe epilepsy (TLE) and explore the related regulatory mechanisms. A rat model of TLE was established by intraperitoneal injection of lithium chloride-pilocarpine. These model rats were injected intracerebroventricularly with an miRNA-146a inhibitor and Notch-1 siRNA. Then, neuronal damage and cell apoptosis in the cornu ammonis (CA) 1 and 3 regions of the hippocampus were assessed. SOD and MDA levels in the hippocampus were detected by chromatometry, and IL-1β, IL-6, and IL-18 levels were detected by ELISA. Then, we evaluated the expression levels of caspase-9, GFAP, Notch-1, and Hes-1 in the hippocampus. The interaction between Notch-1 and miRNA-146a was assessed by a dual luciferase reporter gene assay. A rat model of TLE was successfully established, which exhibited significantly increased miRNA-146a expression in the hippocampus. Silencing of miRNA-146a significantly alleviated the neuronal damage and cell apoptosis in the CA1 and CA3 regions of the hippocampus in TLE rats and decreased MDA, IL-1β, IL-6, and IL-18 levels and increased SOD levels in the hippocampus of TLE rats. In addition, silencing of miRNA-146a significantly decreased the expression levels of caspase-9, GFAP, Notch-1, and Hes-1 in the hippocampus of TLE rats. Notch-1 was identified as a target of miRNA-146a and silencing of Notch-1 aggravated the neuronal damage in the CA1 and CA3 regions. Silencing of miRNA-146a alleviated the neuronal damage in the hippocampus of TLE rats by down-regulating Notch-1.
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Affiliation(s)
- Hui Huang
- Department of Neurology, Huaibei People's Hospital, No. 66, Huaihai West Road, Huaibei City, 235000, Anhui Province, China
| | - Guiyun Cui
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China
| | - Hai Tang
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China
| | - Lingwen Kong
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China
| | - Xiaopeng Wang
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China
| | - Chenchen Cui
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China
| | - Qihua Xiao
- Epilepsy Center, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China.
| | - Huiming Ji
- Medical Laboratory, Affiliated Hospital, Xuzhou Medical University, No. 99, Huaihai West Road, Xuzhou City, 221002, Jiangsu Province, China.
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Sun C, Fu J, Qu Z, Li D, Si P, Qiao Q, Zhang W, Xue Y, Zhen J, Wang W. Chronic mild hypoxia promotes hippocampal neurogenesis involving Notch1 signaling in epileptic rats. Brain Res 2019; 1714:88-98. [PMID: 30768929 DOI: 10.1016/j.brainres.2019.02.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 02/06/2019] [Accepted: 02/11/2019] [Indexed: 01/08/2023]
Abstract
Cognitive impairment is one of the most common and disabling co-morbidities of epilepsy. It is therefore imperative to find novel treatment approaches to rescue cognitive function among epilepsy patients. Adult neurogenesis is strongly implicated in cognitive function, and mild hypoxia is known to promote the proliferation and differentiation of both embryonic and adult neural stem cells (NSCs). In the present study, we investigated the effect of mild hypoxia on cognitive function and hippocampal neurogenesis of rats with pilocarpine-induced chronic epilepsy. Chronic epilepsy induced marked spatial learning and memory deficits in the Morris water maze that were rescued by consecutively 28 days mild hypoxia exposure (6 h/d at 3000 m altitude equivalent) during the chronic phase. Moreover, mild hypoxia reversed the suppression of hippocampal neurogenesis and the downregulation of NT-3 and BDNF expression in hippocampus and cortex of epileptic rats. Mild hypoxia in vitro also promoted hippocampus-derived NSC proliferation and neuronal differentiation. In addition, mild hypoxia enhanced Notch1 and Hes1 expression, suggesting that Notch1 signaling may be involved in neuroprotection of hypoxia. Our data may help to pave the way for identifying new therapeutic targets for rescuing cognition conflicts in epileptic patients by using hypoxia to promote hippocampus neurogenesis.
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Affiliation(s)
- Can Sun
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Jian Fu
- Department of Emergency, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Zhenzhen Qu
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Dongxiao Li
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Peipei Si
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Qi Qiao
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Wenlin Zhang
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Yan Xue
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Junli Zhen
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China.
| | - Weiping Wang
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China.
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Saffarzadeh F, Modarres Mousavi SM, Lotfinia AA, Alipour F, Hosseini Ravandi H, Karimzadeh F. Discrepancies of Notch 1 receptor during development of chronic seizures. J Cell Physiol 2019; 234:13773-13780. [DOI: 10.1002/jcp.28056] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 12/18/2018] [Indexed: 12/27/2022]
Affiliation(s)
| | - Sayed Mostafa Modarres Mousavi
- Shefa Neuroscience Research Center, Khatam Alanbia Hospital Tehran Iran
- Department of Nanobiotechnology Faculty of Biological Sciences, Tarbiat Modares University Tehran Iran
| | | | - Fatemeh Alipour
- Shefa Neuroscience Research Center, Khatam Alanbia Hospital Tehran Iran
| | | | - Fariba Karimzadeh
- Cellular and Molecular Research Center, Iran University of Medical Sciences Tehran Iran
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Li Y, Wu L, Yu M, Yang F, Wu B, Lu S, Tu M, Xu H. HIF-1α is Critical for the Activation of Notch Signaling in Neurogenesis During Acute Epilepsy. Neuroscience 2018; 394:206-219. [PMID: 30394322 DOI: 10.1016/j.neuroscience.2018.10.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 09/30/2018] [Accepted: 10/22/2018] [Indexed: 01/01/2023]
Abstract
Emerging evidence suggests that hypoxia-inducible factors (specifically, HIF-1α) and Notch signaling are involved in epileptogenesis and that cross-coupling exists between HIF-1α and Notch signaling in other diseases, including tumors and ischemia. However, the exact molecular mechanisms by which HIF-1α and Notch signaling affect the development of epilepsy, especially regarding neurogenesis, remain unclear. In the present study, we investigated the role of HIF-1α in neurogenesis and whether Notch signaling is involved in this process during epileptogenesis by assessing hippocampal apoptosis, neuronal injury, and the proliferation and differentiation of neural stem cells (NSCs) in four groups, including control, epilepsy, epilepsy+2-methoxyestradiol (2ME2) and epilepsy+GSI-IX (DAPT) groups. Our data demonstrated that HIF-1α mediated neurogenesis during acute epilepsy, which required the participation of Notch signaling. The immunoprecipitation data illustrated that HIF-1α activated Notch signaling by physically interacting with the Notch intracellular domain (NICD) in epilepsy. In conclusion, our results suggested that HIF-1α-Notch signaling enhanced neurogenesis in acute epilepsy and that neurogenesis during epileptogenesis was reduced once this pathway was blocked; thus, members of this pathway might be potential therapeutic targets for epilepsy.
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Affiliation(s)
- Yushuang Li
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Lei Wu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Minhua Yu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Fei Yang
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Bo Wu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Shuting Lu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Mengqi Tu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Haibo Xu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China.
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Arbabi Jahan A, Rad A, Ghanbarabadi M, Amin B, Mohammad-Zadeh M. The role of serotonin and its receptors on the anticonvulsant effect of curcumin in pentylenetetrazol-induced seizures. Life Sci 2018; 211:252-260. [PMID: 30243647 DOI: 10.1016/j.lfs.2018.09.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 08/08/2018] [Accepted: 09/03/2018] [Indexed: 11/30/2022]
Abstract
AIM Curcumin, derived from turmeric, has been demonstrated to be effective in controlling seizures, although the exact mechanism is yet unknown. In this study, the role of serotonin and its receptors in the anticonvulsant effect of curcumin was evaluated in mice. MAIN METHODS Total 110 mice were randomly divided into 11 groups (n = 10). In the first to the fourth groups, the role of curcumin (150 mg/kg, i.p) and serotonin (PCPA (100 mg/kg); was used to deplete the brain serotonin levels) was investigated. The fifth group first received NAD-299 (4 mg/kg, sc), RS-102221 (5 mg/kg, i.p), SDZ205-557 Hydrochloride (1 mg/kg, i.p), and SB 26997 (10 mg/kg, i.p), then curcumin. The sixth group received NAD-299, curcumin. The animals in the seventh to ninth groups received 5-HT2C, 5-HT4, and 5-HT7 antagonists, respectively, with curcumin. The tenth group received HTR2C antagonist and the eleventh group received HTR4 antagonist. In all animals 25 min after curcumin PTZ (80 mg/kg; i.p) was injected. KEY FINDINGS PCPA not only inhibited the anticonvulsant action of curcumin, but also reversed some of its anticonvulsant effect. The 5-HT1A, 5-HT2C and 5-HT4 antagonists diminished but 5-HT7 antagonist strengthened the anticonvulsant effect of curcumin. Evaluation of gene expression using real-time PCR confirmed that only 5-HT7 gene expression was reduced after curcumin injection. SIGNIFICANCE According to these results, it may be suggested that curcumin exerts anticonvulsive effects by increasing the serotonin levels in the brain that influence receptors, including 5-HT1A, 5-HT2C, and 5-HT4 and likely through the reduction of 5-HT7 gene expression.
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Affiliation(s)
- Ahmad Arbabi Jahan
- Student Research Committee, Sabzevar University of Medical Sciences, Sabzevar, Iran; Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Abolfazl Rad
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Mustafa Ghanbarabadi
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Bahareh Amin
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran; Department of Physiology and Pharmacology, Faculty of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Mohammad Mohammad-Zadeh
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran; Department of Physiology and Pharmacology, Faculty of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran; Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, 9177948564, Mashhad, Iran.
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Navidhamidi M, Ghasemi M, Mehranfard N. Epilepsy-associated alterations in hippocampal excitability. Rev Neurosci 2018; 28:307-334. [PMID: 28099137 DOI: 10.1515/revneuro-2016-0059] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/03/2016] [Indexed: 11/15/2022]
Abstract
The hippocampus exhibits a wide range of epilepsy-related abnormalities and is situated in the mesial temporal lobe, where limbic seizures begin. These abnormalities could affect membrane excitability and lead to overstimulation of neurons. Multiple overlapping processes refer to neural homeostatic responses develop in neurons that work together to restore neuronal firing rates to control levels. Nevertheless, homeostatic mechanisms are unable to restore normal neuronal excitability, and the epileptic hippocampus becomes hyperexcitable or hypoexcitable. Studies show that there is hyperexcitability even before starting recurrent spontaneous seizures, suggesting although hippocampal hyperexcitability may contribute to epileptogenesis, it alone is insufficient to produce epileptic seizures. This supports the concept that the hippocampus is not the only substrate for limbic seizure onset, and a broader hyperexcitable limbic structure may contribute to temporal lobe epilepsy (TLE) seizures. Nevertheless, seizures also occur in conditions where the hippocampus shows a hypoexcitable phenotype. Since TLE seizures most often originate in the hippocampus, it could therefore be assumed that both hippocampal hypoexcitability and hyperexcitability are undesirable states that make the epileptic hippocampal network less stable and may, under certain conditions, trigger seizures.
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10
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Karimzadeh F, Modarres Mousavi SM, Alipour F, Hosseini Ravandi H, Kovac S, Gorji A. Developmental changes in Notch1 and NLE1 expression in a genetic model of absence epilepsy. Brain Struct Funct 2017; 222:2773-2785. [PMID: 28210849 DOI: 10.1007/s00429-017-1371-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 01/16/2017] [Indexed: 01/08/2023]
Abstract
Childhood absence epilepsy (CAE) is an epilepsy syndrome with seizures occurring in the early childhood, highlighting that seizures susceptibility in CAE is dependent on brain development. The Notch 1 signalling pathway is important in brain development, yet the role of the Notch1 signalling pathway in CAE remains elusive. We here explored Notch1 and its modulator notchless homologue 1 (NLE1) expression in WAG/Rij and control rats using immunohistochemistry. Functional Notch 1 effects were assessed in WAG/Rij rats in vivo. WAG/Rij rats lack the developmental increase in cortical Notch1 and NLE 1 mRNA expression seen in controls, and Notch 1 and NLE1 mRNA and protein expression were lower in somatosensory cortices of WAG/Rij rats when compared to controls. This coincided with an overall decreased cortical GFAP expression in the early development in WAG/Rij rats. These effects were region-specific as they were not observed in thalamic tissues. Neuron-to-glia ratio as a marker of the impact of Notch signalling on differentiation was higher in layer 4 of somatosensory cortex of WAG/Rij rats. Acute application of Notch 1 agonist Jagged 1 suppressed, whereas DAPT, a Notch antagonist, facilitated spike and wave discharges (SWDs) in WAG/Rij rats. These findings point to Notch1 as an important signalling pathway in CAE which likely shapes architectural organization of the somatosensory cortex, a region critically involved in developmental epileptogenesis in CAE. More immediate effects of Notch 1 signalling are seen on in vivo SWDs in CAE, pointing to the Notch 1 pathway as a possible treatment target in CAE.
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MESH Headings
- Age Factors
- Animals
- Antigens, Nuclear/metabolism
- Brain Waves
- Disease Models, Animal
- Electrocorticography
- Epilepsy, Absence/genetics
- Epilepsy, Absence/metabolism
- Epilepsy, Absence/physiopathology
- Gene Expression Regulation, Developmental
- Genetic Predisposition to Disease
- Glial Fibrillary Acidic Protein/metabolism
- Immunohistochemistry
- Jagged-1 Protein/administration & dosage
- Microfilament Proteins/genetics
- Microfilament Proteins/metabolism
- Nerve Tissue Proteins/metabolism
- Phenotype
- Rats, Wistar
- Real-Time Polymerase Chain Reaction
- Receptor, Notch1/drug effects
- Receptor, Notch1/genetics
- Receptor, Notch1/metabolism
- Somatosensory Cortex/drug effects
- Somatosensory Cortex/growth & development
- Somatosensory Cortex/metabolism
- Somatosensory Cortex/physiopathology
- Thalamus/metabolism
- Thalamus/physiopathology
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Affiliation(s)
- Fariba Karimzadeh
- Shefa Neuroscience Research Centre, Khatam Alanbia Hospital, Tehran, Iran
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
| | | | - Fatemeh Alipour
- Shefa Neuroscience Research Centre, Khatam Alanbia Hospital, Tehran, Iran
| | | | - Stjepana Kovac
- Department of Neurology, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Ali Gorji
- Shefa Neuroscience Research Centre, Khatam Alanbia Hospital, Tehran, Iran.
- Department of Neurology, Westfälische Wilhelms-Universität Münster, Münster, Germany.
- Epilepsy Research Center, Department of Neurosurgery, Westfälische Wilhelms-Universität Münster, Robert-Koch-Straße 45, 48149, Münster, Germany.
- Department of Neuroscience, Mashhad University of Medical Sciences, Mashhad, Iran.
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Cysteinyl Leukotrienes as Potential Pharmacological Targets for Cerebral Diseases. Mediators Inflamm 2017; 2017:3454212. [PMID: 28607533 PMCID: PMC5451784 DOI: 10.1155/2017/3454212] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 04/10/2017] [Accepted: 04/19/2017] [Indexed: 02/06/2023] Open
Abstract
Cysteinyl leukotrienes (CysLTs) are potent lipid mediators widely known for their actions in asthma and in allergic rhinitis. Accumulating data highlights their involvement in a broader range of inflammation-associated diseases such as cancer, atopic dermatitis, rheumatoid arthritis, and cardiovascular diseases. The reported elevated levels of CysLTs in acute and chronic brain lesions, the association between the genetic polymorphisms in the LTs biosynthesis pathways and the risk of cerebral pathological events, and the evidence from animal models link also CysLTs and brain diseases. This review will give an overview of how far research has gone into the evaluation of the role of CysLTs in the most prevalent neurodegenerative disorders (ischemia, Alzheimer's and Parkinson's diseases, multiple sclerosis/experimental autoimmune encephalomyelitis, and epilepsy) in order to understand the underlying mechanism by which they might be central in the disease progression.
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Puhakka N, Bot AM, Vuokila N, Debski KJ, Lukasiuk K, Pitkänen A. Chronically dysregulated NOTCH1 interactome in the dentate gyrus after traumatic brain injury. PLoS One 2017; 12:e0172521. [PMID: 28273100 PMCID: PMC5342204 DOI: 10.1371/journal.pone.0172521] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 02/06/2017] [Indexed: 12/13/2022] Open
Abstract
Traumatic brain injury (TBI) can result in several dentate gyrus-regulated disabilities. Almost nothing is known about the chronic molecular changes after TBI, and their potential as treatment targets. We hypothesized that chronic transcriptional alterations after TBI are under microRNA (miRNA) control. Expression of miRNAs and their targets in the dentate gyrus was analyzed using microarrays at 3 months after experimental TBI. Of 305 miRNAs present on the miRNA-array, 12 were downregulated (p<0.05). In parallel, 75 of their target genes were upregulated (p<0.05). A bioinformatics analysis of miRNA targets highlighted the dysregulation of the transcription factor NOTCH1 and 39 of its target genes (NOTCH1 interactome). Validation assays confirmed downregulation of miR-139-5p, upregulation of Notch1 and its activated protein, and positive enrichment of NOTCH1 target gene expression. These findings demonstrate that miRNA-based transcriptional regulation can be present at chronic time points after TBI, and highlight the NOTCH1 interactome as one of the mechanisms behind the dentate gyrus pathology-related morbidities.
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Affiliation(s)
- Noora Puhakka
- Department of Neurobiology, A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Anna Maria Bot
- The Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Niina Vuokila
- Department of Neurobiology, A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Konrad Jozef Debski
- The Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Katarzyna Lukasiuk
- The Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Asla Pitkänen
- Department of Neurobiology, A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
- * E-mail:
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Dixit AB, Banerjee J, Srivastava A, Tripathi M, Sarkar C, Kakkar A, Jain M, Chandra PS. RNA-seq analysis of hippocampal tissues reveals novel candidate genes for drug refractory epilepsy in patients with MTLE-HS. Genomics 2016; 107:178-88. [DOI: 10.1016/j.ygeno.2016.04.001] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 01/12/2016] [Accepted: 04/05/2016] [Indexed: 12/13/2022]
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Fleck J, Marafiga JR, Jesse AC, Ribeiro LR, Rambo LM, Mello CF. Montelukast potentiates the anticonvulsant effect of phenobarbital in mice: an isobolographic analysis. Pharmacol Res 2015; 94:34-41. [PMID: 25684626 DOI: 10.1016/j.phrs.2015.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/29/2015] [Accepted: 02/04/2015] [Indexed: 11/24/2022]
Abstract
Although leukotrienes have been implicated in seizures, no study has systematically investigated whether the blockade of CysLT1 receptors synergistically increases the anticonvulsant action of classic antiepileptics. In this study, behavioral and electroencephalographic methods, as well as isobolographic analysis, are used to show that the CysLT1 inverse agonist montelukast synergistically increases the anticonvulsant action of phenobarbital against pentylenetetrazole-induced seizures. Moreover, it is shown that LTD4 reverses the effect of montelukast. The experimentally derived ED50mix value for a fixed-ratio combination (1:1 proportion) of montelukast plus phenobarbital was 0.06±0.02 μmol, whereas the additively calculated ED50add value was 0.49±0.03 μmol. The calculated interaction index was 0.12, indicating a synergistic interaction. The association of montelukast significantly decreased the antiseizure ED50 for phenobarbital (0.74 and 0.04 μmol in the absence and presence of montelukast, respectively) and, consequently, phenobarbital-induced sedation at equieffective doses. The demonstration of a strong synergism between montelukast and phenobarbital is particularly relevant because both drugs are already used in the clinics, foreseeing an immediate translational application for epileptic patients who have drug-resistant seizures.
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Affiliation(s)
- Juliana Fleck
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil; University Hospital of Santa Maria, Federal University of Santa Maria, Santa Maria, RS, Brazil; Pharmacy Department, Center of Health Sciences, Franciscan University Center, RS, Brazil
| | - Joseane Righes Marafiga
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Ana Cláudia Jesse
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Leandro Rodrigo Ribeiro
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Leonardo Magno Rambo
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Carlos Fernando Mello
- Graduate Program in Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil.
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