1
|
Elmeseiny OSA, Müller HK. A molecular perspective on mGluR5 regulation in the antidepressant effect of ketamine. Pharmacol Res 2024; 200:107081. [PMID: 38278430 DOI: 10.1016/j.phrs.2024.107081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/16/2024] [Accepted: 01/23/2024] [Indexed: 01/28/2024]
Abstract
Ketamine, a non-competitive N-methyl-D-aspartate receptor (NMDAR) antagonist, has received much attention for its rapid antidepressant effects. A single administration of ketamine elicits rapid and sustained antidepressant effects in both humans and animals. Current efforts are focused on uncovering molecular mechanisms responsible for ketamine's antidepressant activity. Ketamine primarily acts via the glutamatergic pathway, and increasing evidence suggests that ketamine induces synaptic and structural plasticity through increased translation and release of neurotrophic factors, activation of mammalian target of rapamycin (mTOR), and α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR)-mediated synaptic potentiation. However, the initial events triggering activation of intracellular signaling cascades and the mechanisms responsible for the sustained antidepressant effects of ketamine remain poorly understood. Over the last few years, it has become apparent that in addition to the fast actions of the ligand-gated AMPARs and NMDARs, metabotropic glutamate receptors (mGluRs), and particularly mGluR5, may also play a role in the antidepressant action of ketamine. Although research on mGluR5 in relation to the beneficial actions of ketamine is still in its infancy, a careful evaluation of the existing literature can identify converging trends and provide new interpretations. Here, we review the current literature on mGluR5 regulation in response to ketamine from a molecular perspective and propose a possible mechanism linking NMDAR inhibition to mGluR5 modulation.
Collapse
Affiliation(s)
- Ola Sobhy A Elmeseiny
- Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Heidi Kaastrup Müller
- Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
| |
Collapse
|
2
|
Qian F, Tang FR. Metabotropic Glutamate Receptors and Interacting Proteins in Epileptogenesis. Curr Neuropharmacol 2017; 14:551-62. [PMID: 27030135 PMCID: PMC4983745 DOI: 10.2174/1570159x14666160331142228] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 12/30/2015] [Accepted: 03/13/2016] [Indexed: 02/07/2023] Open
Abstract
Neurotransmitter and receptor systems are involved in different neurological and neuropsychological disorders such as Parkinson's disease, depression, Alzheimer’s disease and epilepsy. Recent advances in studies of signal transduction pathways or interacting proteins of neurotransmitter receptor systems suggest that different receptor systems may share the common signal transduction pathways or interacting proteins which may be better therapeutic targets for development of drugs to effectively control brain diseases. In this paper, we reviewed metabotropic glutamate receptors (mGluRs) and their related signal transduction pathways or interacting proteins in status epilepticus and temporal lobe epilepsy, and proposed some novel therapeutical drug targets for controlling epilepsy and epileptogenesis.
Collapse
Affiliation(s)
| | - Feng-Ru Tang
- Radiobiology Research Laboratory, Singapore Nuclear Research and Safety Initiative, National University of Singapore, Singapore.
| |
Collapse
|
3
|
Cui Z, Zhou L, Liu C, Zhu G, Wu X, Yan Y, Xia X, Ben Z, Song Y, Zhou Y, Zhang H, Zhang D. The role of Homer1b/c in neuronal apoptosis following LPS-induced neuroinflammation. Neurochem Res 2014; 40:204-15. [PMID: 25503822 DOI: 10.1007/s11064-014-1460-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Revised: 10/16/2014] [Accepted: 10/18/2014] [Indexed: 02/07/2023]
Abstract
Homer, also designated Vesl, is one member of the newly found postsynaptic density scaffold proteins, playing a vital role in maintaining synaptic integrity, regulating intracellular calcium mobilization, and being critical for the regulation of cellular apoptosis. However, its function in the inflamed central nervous system (CNS) is not fully elucidated. Here, we investigated the role of Homer1b/c, a long form of Homer1, in lipopolysaccharide (LPS) induced neuroinflammation in CNS. Western blot analysis indicated that LPS administration significantly increased the expression of Homer1b/c in rat brain. Moreover, double immunofluorescent staining suggested Homer1b/c was mainly distributed in the cytoplasm of neurons and had a close association with cleaved caspase-3 level in neurons in rat brain after LPS injection. In vitro studies indicated that up-regulation of Homer1b/c might be related to the subsequent apoptosis in neurons treated by conditioned media (CM), collected from LPS-stimulated mixed glial cultures (MGC). We also found down-regulation of Homer1b/c partly blocked the increase of cleaved caspase-3 and the proportion of Bax/Bcl-2 in neurons induced by MGC-CM. Taken together, these findings suggested that Homer1b/c might promote neuronal apoptosis via the Bax/Bcl-2 dependent pathway during neuroinflammation in CNS, and inhibiting Homer1b/c expression might provide a novel neuroprotective strategy against the inflammation-related neuronal apoptosis.
Collapse
Affiliation(s)
- Zhiming Cui
- Department of Orthopaedics, The Second Affiliated Hospital of Nantong University, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, Nantong, 226002, Jiangsu, People's Republic of China
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Lv MM, Cheng YC, Xiao ZB, Sun MY, Ren PC, Sun XD. Down-regulation of Homer1b/c attenuates group I metabotropic glutamate receptors dependent Ca²⁺ signaling through regulating endoplasmic reticulum Ca²⁺ release in PC12 cells. Biochem Biophys Res Commun 2014; 450:1568-74. [PMID: 25026550 DOI: 10.1016/j.bbrc.2014.07.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Accepted: 07/07/2014] [Indexed: 10/25/2022]
Abstract
The molecular basis for group I metabotropic glutamate receptors (mGluR1 and 5) coupling to membrane ion channels and intracellular calcium pools is not fully understood. Homer is a family of post synaptic density proteins functionally and physically attached to target proteins at proline-rich sequences. In the present study, we demonstrate that Homer1b/c is constitutively expressed in PC12 cells, whereas Homer1a, the immediate early gene product, can be up-regulated by brain derived neurotrophic factor (BDNF) and glutamate. Knockdown of Homer1b/c using specific target small interfering RNA (siRNA) did not interfere the expression of mGluR1, mGluR5 and their downstream effectors, including inositol-1,4,5-trisphosphate receptors (IP3R), phospholipase C (PLC) and Gq proteins. By analyzing Ca(2+) imaging in PC12 cells, we demonstrated that Homer1b/c is an essential regulator of the Ca(2+) release from the endoplasmic reticulum (ER) induced by the activation of group I mGluRs, IP3R and ryanodine receptors (RyR). Furthermore, the group I mGluRs activation-dependent refilling of the Ca(2+) stores in both resting and depolarizing conditions were strongly attenuated in the absence of Homer1b/c. Together, our results demonstrate that in PC12 cells Homer1b/c is a regulator of group I mGluRs related Ca(2+) homeostasis that is essential for the maintenance of normal Ca(2+) levels in the ER.
Collapse
Affiliation(s)
- Miao-Miao Lv
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shaanxi 710032, China; Department of Anesthesiology, The 323 Hospital of PLA, Xi'an, Shaanxi 710054, China
| | - Yong-Chun Cheng
- Department of Anesthesiology, The Third Hospital of PLA, Baoji, Shaanxi 721004, China
| | - Zhi-Bin Xiao
- Department of Anesthesiology, The 323 Hospital of PLA, Xi'an, Shaanxi 710054, China
| | - Mei-Yan Sun
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shaanxi 710032, China
| | - Peng-Cheng Ren
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shaanxi 710032, China
| | - Xu-De Sun
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shaanxi 710032, China.
| |
Collapse
|
5
|
Xu L, Zhang S, Fan H, Zhong Z, Li X, Jin X, Chang Q. ClC-3 chloride channel in hippocampal neuronal apoptosis. Neural Regen Res 2013; 8:3047-54. [PMID: 25206625 PMCID: PMC4146203 DOI: 10.3969/j.issn.1673-5374.2013.32.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 08/10/2013] [Indexed: 12/18/2022] Open
Abstract
Over-production of nitric oxide is pathogenic for neuronal apoptosis around the ischemic area fol-lowing ischemic brain injury. In this study, an apoptotic model in rat hippocampal neurons was tablished by 0.5 mmol/L 3-morpholinosyndnomine (SIN-1), a nitric oxide donor. The models were then cultured with 0.1 mmol/L of 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDS; the chloride channel blocker) for 18 hours. Neuronal survival was detected using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and apoptosis was assayed by Hoechst 33342-labeled neuronal DNA fluorescence staining. Western blot analysis and immunoche-nescence staining were applied to determine the changes of activated caspase-3 and CIC-3 channel proteins. Real-time PCR was used to detect the mRNA expression of CIC-3. The results showed that SIN-1 reduced the neuronal survival rate, induced neuronal apoptosis, and promoted ClC-3 chloride channel protein and mRNA expression in the apoptotic neurons. DIDS reversed the effect of SIN-1. Our findings indicate that the increased activities of the ClC-3 chloride channel may be involved in hippocampal neuronal apoptosis induced by nitric oxide.
Collapse
Affiliation(s)
- Lijuan Xu
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
- First Hospital of Putian City, Putian 351100, Fujian Province, China
| | - Shuling Zhang
- Department of Pediatrics, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| | - Hongling Fan
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| | - Zhichao Zhong
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| | - Xi Li
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| | - Xiaoxiao Jin
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| | - Quanzhong Chang
- Department of Physiology, Zhuhai Campus of Zunyi Medical College, Zhuhai 519041, Guangdong Province, China
| |
Collapse
|
6
|
Chen T, Zhu J, Zhang C, Huo K, Fei Z, Jiang XF. Protective effects of SKF-96365, a non-specific inhibitor of SOCE, against MPP+-induced cytotoxicity in PC12 cells: potential role of Homer1. PLoS One 2013; 8:e55601. [PMID: 23383239 PMCID: PMC3561331 DOI: 10.1371/journal.pone.0055601] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 12/27/2012] [Indexed: 11/18/2022] Open
Abstract
Parkinson's disease (PD) is the most common neurodegenerative movement disorder, characterized by loss of dopominergic (DA) neurons in substantia nigra pars compacta (SNpc), and can be experimentally mimicked by the neurotoxin MPP+ in vitro models. In this study, we investigated the potential protective effect of SKF-96365, a non-specific inhibitor of SOCE (store-operated calcium entry), on MPP+ induced cytotoxicity in PC12 cells. We found that pretreatment with SKF-96365 (10 µM and 50 µM) 30 min before injury significantly increased cell viability, decreased LDH release, prevented nuclear damage, and inhibited apoptotic cell death in MPP+ stressed PC12 cells. The results of calcium image using the ratiometric calcium indicator Fura-2-AM also showed that SKF-96365 reduced the intracellular calcium overload induced by MPP+ in PC12 cells. In addition, SKF-96365 decreased the expression of Homer1, a more recently discovered postsynaptic scaffolding protein with calcium modulating function, following MPP+ administration in PC12 cells, while had no statistically significant effects on endoplasmic reticulum (ER) calcium concentration. Furthermore, overexpression of Homer1 by using recombinant lentivirus partly reversed protective effects of SKF-96365 against MPP+ injury. The ER Ca2+ release was further amplified and ER calcium recovery was delayed by Homer1 upregulation in PC12 cells following MPP+ insult. Taken together, these data suggest that SKF-96365 protects PC12 cells against MPP+ induced cytotoxicity, and this protection may be at least in part on the inhibition of intracellular calcium overload and suppression of Homer1-mediated ER Ca2+ release.
Collapse
Affiliation(s)
- Tao Chen
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
- Department of Neurosurgery, The 123th Hospital of PLA, Bengbu, Anhui, China
| | - Jie Zhu
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Chi Zhang
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Kai Huo
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Zhou Fei
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
- * E-mail: (ZF); (XFJ)
| | - Xiao-fan Jiang
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
- * E-mail: (ZF); (XFJ)
| |
Collapse
|
7
|
Li Y, Krogh KA, Thayer SA. Epileptic stimulus increases Homer 1a expression to modulate endocannabinoid signaling in cultured hippocampal neurons. Neuropharmacology 2012; 63:1140-9. [PMID: 22814532 DOI: 10.1016/j.neuropharm.2012.07.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 06/12/2012] [Accepted: 07/03/2012] [Indexed: 02/06/2023]
Abstract
Endocannabinoid (eCB) signaling serves as an on-demand neuroprotective system. eCBs are produced postsynaptically in response to depolarization or activation of metabotropic glutamate receptors (mGluRs) and act on presynaptic cannabinoid receptor-1 to suppress synaptic transmission. Here, we examined the effects of epileptiform activity on these two forms of eCB signaling in hippocampal cultures. Treatment with bicuculline and 4-aminopyridine (Bic + 4-AP), which induced burst firing, inhibited metabotropic-induced suppression of excitation (MSE) and prolonged the duration of depolarization-induced suppression of excitation (DSE). The Homer family of proteins provides a scaffold for signaling molecules including mGluRs. It is known that seizures induce the expression of the short Homer isoform 1a (H1a) that acts in a dominant negative manner to uncouple Homer scaffolds. Bic + 4-AP treatment increased H1a mRNA. A group I mGluR antagonist blocked the Bic + 4-AP-evoked increase in burst firing, the increase in H1a expression, and the inhibition of MSE. Bic + 4-AP treatment reduced mGluR-mediated Ca(2+) mobilization from inositol trisphosphate-sensitive stores relative to untreated cells. Expression of H1a, but not a mutant form that cannot bind Homer ligands, mimicked Bic + 4-AP inhibition of MSE and mGluR-mediated Ca(2+) mobilization. In cells expressing shRNA targeted to Homer 1 mRNA, Bic + 4-AP did not affect mGluR-mediated Ca(2+) release. Furthermore, knockdown of H1a prevented the inhibition of MSE induced by Bic + 4-AP. Thus, an epileptic stimulus increased H1a expression, which subsequently uncoupled mGluR-mediated eCB production. These results indicate that seizure activity modulates eCB-mediated synaptic plasticity, suggesting a changing role for the eCB system following exposure to aberrant patterns of excitatory synaptic activity.
Collapse
Affiliation(s)
- Yan Li
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, MN 55455, USA
| | | | | |
Collapse
|