1
|
Bale R, Doshi G. Deciphering the role of siRNA in anxiety and depression. Eur J Pharmacol 2024; 981:176868. [PMID: 39128805 DOI: 10.1016/j.ejphar.2024.176868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 07/02/2024] [Accepted: 08/05/2024] [Indexed: 08/13/2024]
Abstract
Anxiety and depression are central nervous system illnesses that are among the most prevalent medical concerns of the twenty-first century. Patients with this condition and their families bear psychological, financial, and societal hardship. There are currently restrictions when utilizing the conventional course of treatment. RNA interference is expected to become an essential approach in anxiety and depression due to its potent and targeted gene silencing. Silencing of genes by post-transcriptional modification is the mechanism of action of small interfering RNA (siRNA). The suppression of genes linked to disease is typically accomplished by siRNA molecules in an efficient and targeted manner. Unfavourable immune responses, off-target effects, naked siRNA instability, nuclease vulnerability, and the requirement to create an appropriate delivery method are some of the challenges facing the clinical application of siRNA. This review focuses on the use of siRNA in the treatment of anxiety and depression.
Collapse
Affiliation(s)
- Rajeshwari Bale
- Department of Pharmacology, SVKM's Dr. Bhanuben Nanavati College of Pharmacy, V L M Road, Vile Parle (w), Mumbai, 400056, India
| | - Gaurav Doshi
- Department of Pharmacology, SVKM's Dr. Bhanuben Nanavati College of Pharmacy, V L M Road, Vile Parle (w), Mumbai, 400056, India.
| |
Collapse
|
2
|
Bian X, Li M, Lou S. Resistance training boosts lactate transporters and synaptic proteins in insulin-resistance mice. Heliyon 2024; 10:e34425. [PMID: 39082040 PMCID: PMC11284409 DOI: 10.1016/j.heliyon.2024.e34425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 07/09/2024] [Accepted: 07/09/2024] [Indexed: 08/02/2024] Open
Abstract
Background This investigation delineates the influence of resistance training on the expression of synaptic plasticity-related proteins in the hippocampi of insulin-resistant mice and explores the underlying molecular mechanisms. Methods Six-week-old male C57BL/6 J mice were stratified into a control group and a high-fat diet group to induce insulin resistance over a 12-week period. Subsequently, the mice were further divided into sedentary and resistance training cohorts, with the latter engaging in a 12-week ladder-climbing regimen. Post-intervention, blood, and hippocampal specimens were harvested for analytical evaluation. Results In the insulin-resistant mice, elevated blood lactate levels were observed alongside diminished expression of synaptic plasticity-related proteins, monocarboxylate transporters (MCTs), and reduced phosphorylation of protein kinase B (Akt) and mechanistic target of rapamycin (mTOR). In contrast, the expression of eukaryotic translation initiation factor 4 E-binding protein 2 was significantly augmented. Resistance training mitigated insulin resistance, decreased blood lactate levels, and enhanced the expression and phosphorylation of mTOR, regulatory-associated protein of mTOR, MCTs, and synaptic plasticity-related proteins. Conclusions Resistance training mitigates insulin resistance and improves hippocampal synaptic plasticity by normalizing blood lactate levels and enhancing mTOR, MCTs, and synaptic plasticity-related proteins. It may also activate mTORC1 via the PI3K/Akt pathway, promote lactate utilization, and enhance synaptic plasticity proteins, potentially alleviating peripheral insulin resistance. Further research is needed to confirm these mechanisms.
Collapse
Affiliation(s)
- Xuepeng Bian
- Department of Rehabilitation, School of International Medical Technology, Shanghai Sanda University, Shanghai, China
- School of Exercise and Health, Shanghai University of Sport, Shanghai, China
| | - Mingming Li
- School of Exercise and Health, Shanghai University of Sport, Shanghai, China
| | - Shujie Lou
- School of Exercise and Health, Shanghai University of Sport, Shanghai, China
| |
Collapse
|
3
|
Cagnetta R, Lacaille JC, Sonenberg N. Exploration of new space elicits phosphorylation of GluA1(Ser831) and S6K and expression of Arc in the hippocampus in vivo as in long-term potentiation. Mol Brain 2024; 17:35. [PMID: 38858726 PMCID: PMC11165848 DOI: 10.1186/s13041-024-01100-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 05/14/2024] [Indexed: 06/12/2024] Open
Abstract
The brain responds to experience through modulation of synaptic transmission, that is synaptic plasticity. An increase in the strength of synaptic transmission is manifested as long-term potentiation (LTP), while a decrease in the strength of synaptic transmission is expressed as long-term depression (LTD). Most of the studies of synaptic plasticity have been carried out by induction via electrophysiological stimulation. It is largely unknown in which behavioural tasks such synaptic plasticity occurs. Moreover, some stimuli can induce both LTP and LTD, thus making it difficult to separately study the different forms of synaptic plasticity. Two studies have shown that an aversive memory task - inhibitory avoidance learning and contextual fear conditioning - physiologically and selectively induce LTP and an LTP-like molecular change, respectively, in the hippocampus in vivo. Here, we show that a non-aversive behavioural task - exploration of new space - physiologically and selectively elicits a biochemical change in the hippocampus that is a hallmark of LTP. Specifically, we found that exploration of new space induces an increase in the phosphorylation of GluA1(Ser831), without affecting the phosphorylation of GluA1(Ser845), which are biomarkers of early-LTP and not NMDAR-mediated LTD. We also show that exploration of new space engenders the phosphorylation of the translational regulator S6K and the expression of Arc, which are features of electrophysiologically-induced late-LTP in the hippocampus. Therefore, our results show that exploration of new space is a novel non-aversive behavioural paradigm that elicits molecular changes in vivo that are analogous to those occurring during early- and late-LTP, but not during NMDAR-mediated LTD.
Collapse
Affiliation(s)
- Roberta Cagnetta
- Department of Cell Biology and Program in Neuroscience, Harvard Medical School, Boston, MA, 02115, USA.
- Department of Biochemistry and Goodman Cancer Institute, McGill University, Montreal, QC, H3A 1A3, Canada.
| | - Jean-Claude Lacaille
- Department of Neurosciences, Center for Interdisciplinary Research On Brain and Learning, Research Group On Neural Signaling and Circuitry, University of Montreal, Montreal, QC, H3T1J4, Canada
| | - Nahum Sonenberg
- Department of Biochemistry and Goodman Cancer Institute, McGill University, Montreal, QC, H3A 1A3, Canada.
| |
Collapse
|
4
|
Zhang Y, Cheng X, Wu L, Li J, Liu C, Wei M, Zhu C, Huang H, Lin W. Pharmacological inhibition of S6K1 rescues synaptic deficits and attenuates seizures and depression in chronic epileptic rats. CNS Neurosci Ther 2024; 30:e14475. [PMID: 37736829 PMCID: PMC10945394 DOI: 10.1111/cns.14475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 08/11/2023] [Accepted: 08/27/2023] [Indexed: 09/23/2023] Open
Abstract
BACKGROUND Recent studies have shown that mTOR signaling plays an important role in synaptic plasticity. However, the function of S6K1, the mechanistic target of rapamycin kinase complex 1 (mTORC1) substrate, in epilepsy remains unknown. AIMS Our present study aimed to explore the mechanism by which S6K1 is involved in chronic epilepsy. METHODS First, immunostaining was used to measure neurite length and complexity in kainic acid (KA)-treated primary cultured neurons treated with PF-4708671, a highly selective S6K1 inhibitor. We obtained evidence for the role of S6K1 in protecting and promoting neuronal growth and development in vitro. Next, to explore the function and mechanism of the S6K1 inhibitor in epilepsy, a pilocarpine-induced chronic epileptic rat model was established. In vivo electrophysiology (including local field potentiation in CA1 and long-term potentiation), depression/anxiety-like behavior tests, and Golgi staining were performed to assess seizure behavior, power spectral density, depression/anxiety-like behavior, and synaptic plasticity. Furthermore, western blotting was applied to explore the potential molecular mechanisms. RESULTS We found that inhibition of S6K1 expression significantly decreased seizures and depression-like behavior and restored power at low frequencies (1-80 Hz), especially in the delta, theta, and alpha bands, in chronic epileptic rats. In addition, PF-4708671 reversed the LTP defect in hippocampal CA3-CA1 and corrected spine loss and dendritic pathology. CONCLUSION In conclusion, our data suggest that inhibition of S6K1 attenuates seizures and depression in chronic epileptic rats via the rescue of synaptic structural and functional deficits. Given the wide range of physiological functions of mTOR, inhibition of its effective but relatively simple functional downstream molecules is a promising target for the development of drugs for epilepsy.
Collapse
Affiliation(s)
- Yuying Zhang
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Xiaojuan Cheng
- Fujian Medical University Second Affiliated HospitalQuanzhouChina
| | - Luyan Wu
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Juan Li
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Changyun Liu
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Mingjia Wei
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Chaofeng Zhu
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Huapin Huang
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| | - Wanhui Lin
- Fujian Medical University Union HospitalFuzhouChina
- Fujian Key Laboratory of Molecular NeurologyFujian Medical UniversityFuzhouChina
| |
Collapse
|
5
|
Kommaddi RP, Gowaikar R, P A H, Diwakar L, Singh K, Mondal A. Akt activation ameliorates deficits in hippocampal-dependent memory and activity-dependent synaptic protein synthesis in an Alzheimer's disease mouse model. J Biol Chem 2024; 300:105619. [PMID: 38182004 PMCID: PMC10839450 DOI: 10.1016/j.jbc.2023.105619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 12/22/2023] [Accepted: 12/24/2023] [Indexed: 01/07/2024] Open
Abstract
Protein kinase-B (Akt) and the mechanistic target of rapamycin (mTOR) signaling pathways are implicated in Alzheimer's disease (AD) pathology. Akt/mTOR signaling pathways, activated by external inputs, enable new protein synthesis at the synapse and synaptic plasticity. The molecular mechanisms impeding new protein synthesis at the synapse in AD pathogenesis remain elusive. Here, we aimed to understand the molecular mechanisms prior to the manifestation of histopathological hallmarks by characterizing Akt1/mTOR signaling cascades and new protein synthesis in the hippocampus of WT and amyloid precursor protein/presenilin-1 (APP/PS1) male mice. Intriguingly, compared to those in WT mice, we found significant decreases in pAkt1, pGSK3β, pmTOR, pS6 ribosomal protein, and p4E-BP1 levels in both post nuclear supernatant and synaptosomes isolated from the hippocampus of one-month-old (presymptomatic) APP/PS1 mice. In synaptoneurosomes prepared from the hippocampus of presymptomatic APP/PS1 mice, activity-dependent protein synthesis at the synapse was impaired and this deficit was sustained in young adults. In hippocampal neurons from C57BL/6 mice, downregulation of Akt1 precluded synaptic activity-dependent protein synthesis at the dendrites but not in the soma. In three-month-old APP/PS1 mice, Akt activator (SC79) administration restored deficits in memory recall and activity-dependent synaptic protein synthesis. C57BL/6 mice administered with an Akt inhibitor (MK2206) resulted in memory recall deficits compared to those treated with vehicle. We conclude that dysregulation of Akt1/mTOR and its downstream signaling molecules in the hippocampus contribute to memory recall deficits and loss of activity-dependent synaptic protein synthesis. In AD mice, however, Akt activation ameliorates deficits in memory recall and activity-dependent synaptic protein synthesis.
Collapse
Affiliation(s)
| | - Ruturaj Gowaikar
- Centre for Neuroscience, Indian Institute of Science, Bangalore, India
| | - Haseena P A
- Centre for Brain Research, Indian Institute of Science, Bangalore, India; Manipal Academy of Higher Education, Manipal, India
| | - Latha Diwakar
- Centre for Brain Research, Indian Institute of Science, Bangalore, India
| | - Kunal Singh
- Centre for Neuroscience, Indian Institute of Science, Bangalore, India
| | - Amrita Mondal
- Centre for Brain Research, Indian Institute of Science, Bangalore, India
| |
Collapse
|
6
|
Goldberg AR, Dovas A, Torres D, Sharma SD, Mela A, Merricks EM, Olabarria M, Shokooh LA, Zhao HT, Kotidis C, Calvaresi P, Viswanathan A, Banu MA, Razavilar A, Sudhakar TD, Saxena A, Chokran C, Humala N, Mahajan A, Xu W, Metz JB, Chen C, Bushong EA, Boassa D, Ellisman MH, Hillman EMC, McKhann GM, Gill BJA, Rosenfeld SS, Schevon CA, Bruce JN, Sims PA, Peterka DS, Canoll P. Glioma-Induced Alterations in Excitatory Neurons are Reversed by mTOR Inhibition. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.10.575092. [PMID: 38293120 PMCID: PMC10827113 DOI: 10.1101/2024.01.10.575092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Gliomas are highly aggressive brain tumors characterized by poor prognosis and composed of diffusely infiltrating tumor cells that intermingle with non-neoplastic cells in the tumor microenvironment, including neurons. Neurons are increasingly appreciated as important reactive components of the glioma microenvironment, due to their role in causing hallmark glioma symptoms, such as cognitive deficits and seizures, as well as their potential ability to drive glioma progression. Separately, mTOR signaling has been shown to have pleiotropic effects in the brain tumor microenvironment, including regulation of neuronal hyperexcitability. However, the local cellular-level effects of mTOR inhibition on glioma-induced neuronal alterations are not well understood. Here we employed neuron-specific profiling of ribosome-bound mRNA via 'RiboTag,' morphometric analysis of dendritic spines, and in vivo calcium imaging, along with pharmacological mTOR inhibition to investigate the impact of glioma burden and mTOR inhibition on these neuronal alterations. The RiboTag analysis of tumor-associated excitatory neurons showed a downregulation of transcripts encoding excitatory and inhibitory postsynaptic proteins and dendritic spine development, and an upregulation of transcripts encoding cytoskeletal proteins involved in dendritic spine turnover. Light and electron microscopy of tumor-associated excitatory neurons demonstrated marked decreases in dendritic spine density. In vivo two-photon calcium imaging in tumor-associated excitatory neurons revealed progressive alterations in neuronal activity, both at the population and single-neuron level, throughout tumor growth. This in vivo calcium imaging also revealed altered stimulus-evoked somatic calcium events, with changes in event rate, size, and temporal alignment to stimulus, which was most pronounced in neurons with high-tumor burden. A single acute dose of AZD8055, a combined mTORC1/2 inhibitor, reversed the glioma-induced alterations on the excitatory neurons, including the alterations in ribosome-bound transcripts, dendritic spine density, and stimulus evoked responses seen by calcium imaging. These results point to mTOR-driven pathological plasticity in neurons at the infiltrative margin of glioma - manifested by alterations in ribosome-bound mRNA, dendritic spine density, and stimulus-evoked neuronal activity. Collectively, our work identifies the pathological changes that tumor-associated excitatory neurons experience as both hyperlocal and reversible under the influence of mTOR inhibition, providing a foundation for developing therapies targeting neuronal signaling in glioma.
Collapse
Affiliation(s)
- Alexander R Goldberg
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Athanassios Dovas
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Daniela Torres
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Sohani Das Sharma
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032
| | - Angeliki Mela
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Edward M Merricks
- Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Markel Olabarria
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | | | - Hanzhi T Zhao
- Laboratory for Functional Optical Imaging, Zuckerman Mind Brain Behavior Institute, Departments of Biomedical Engineering and Radiology, Columbia University, New York, NY 10027, USA
| | - Corina Kotidis
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Peter Calvaresi
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Ashwin Viswanathan
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Matei A Banu
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Aida Razavilar
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Tejaswi D Sudhakar
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Ankita Saxena
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Cole Chokran
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Nelson Humala
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Aayushi Mahajan
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Weihao Xu
- Laboratory for Functional Optical Imaging, Zuckerman Mind Brain Behavior Institute, Departments of Biomedical Engineering and Radiology, Columbia University, New York, NY 10027, USA
| | - Jordan B Metz
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032
| | - Cady Chen
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Eric A Bushong
- National Center for Microscopy and Imaging Research, University of California, San Diego, La Jolla, CA 92093, USA
| | - Daniela Boassa
- National Center for Microscopy and Imaging Research, University of California, San Diego, La Jolla, CA 92093, USA
| | - Mark H Ellisman
- National Center for Microscopy and Imaging Research, University of California, San Diego, La Jolla, CA 92093, USA
| | - Elizabeth M C Hillman
- Laboratory for Functional Optical Imaging, Zuckerman Mind Brain Behavior Institute, Departments of Biomedical Engineering and Radiology, Columbia University, New York, NY 10027, USA
| | - Guy M McKhann
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Brian J A Gill
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | | | - Catherine A Schevon
- Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Jeffrey N Bruce
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Peter A Sims
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032
- Sulzberger Columbia Genome Center, Columbia University Irving Medical Center, New York, NY, 10032
- Department of Biochemistry & Molecular Biophysics, Columbia University Irving Medical Center, New York, NY, 10032
| | - Darcy S Peterka
- Irving Institute for Cancer Dynamics, Columbia University, New York, NY 10027, USA
- Mortimer B. Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10027, USA
| | - Peter Canoll
- Department of Pathology and Cell Biology, Irving Cancer Research Center, Columbia University Irving Medical Center, New York, NY 10032, USA
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY 10032, USA
| |
Collapse
|
7
|
Seyedhosseini Tamijani SM, Beirami E, Ghazvini H, Rafaiee R, Nazeri M, Razavinasab M. A Review on the Disruption of Novel Object Recognition Induced by Methamphetamine. ADDICTION & HEALTH 2023; 15:289-297. [PMID: 38322487 PMCID: PMC10843358 DOI: 10.34172/ahj.2023.1307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 11/07/2021] [Indexed: 02/08/2024]
Abstract
Background Methamphetamine (MA), is a widely abused synthetic psychostimulant that leads to irreversible brain damage manifested as cognitive impairments in humans and animals. The novel object recognition (NOR) task is a commonly used behavioral assay for the investigation of non-spatial memory in rodents. This test is based on the natural tendency of rodents to spend more time exploring a novel object than a familiar one. NOR test has been used in many studies investigating cognitive deficits caused by MA in rodents. The objective of the present study was to review neurobiological mechanisms that might be responsible for MA-induced NOR alterations. Methods A PubMed search showed 83 publications using novel object recognition and methamphetamine as keywords in the past 10 years. Findings The present study revealed different MA regimens cause recognition memory impairment in rodents. In addition, it was found that the main neurobiological mechanism involved in MA-induced recognition deficits is the dysfunction of monoaminergic systems. Conclusion NOR is a useful test to assess the cognitive functions following MA administration and evaluate the efficacy of new therapeutic agents in MA-addicted individuals.
Collapse
Affiliation(s)
| | - Elmira Beirami
- Department of Animal Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Hamed Ghazvini
- Department of Neuroscience, School of Advanced Technologies in Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Raheleh Rafaiee
- Department of Neuroscience, School of Advanced Technologies in Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Masoud Nazeri
- Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Kerman, Iran
| | - Moazamehosadat Razavinasab
- Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Kerman, Iran
- Department of Physiology, Kerman University of Medical Sciences, Kerman, Iran
| |
Collapse
|
8
|
Eyford BA, Lazarczyk MJ, Choi KB, Varghese M, Arora H, Kari S, Munro L, Pfeifer CG, Sowa A, Dickstein DR, Dickstein DL, Jefferies WA. Outside-in signaling through the major histocompatibility complex class-I cytoplasmic tail modulates glutamate receptor expression in neurons. Sci Rep 2023; 13:13079. [PMID: 37567897 PMCID: PMC10421907 DOI: 10.1038/s41598-023-38663-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 07/12/2023] [Indexed: 08/13/2023] Open
Abstract
The interplay between AMPA-type glutamate receptors (AMPARs) and major histocompatibility complex class I (MHC-I) proteins in regulating synaptic signaling is a crucial aspect of central nervous system (CNS) function. In this study, we investigate the significance of the cytoplasmic tail of MHC-I in synaptic signaling within the CNS and its impact on the modulation of synaptic glutamate receptor expression. Specifically, we focus on the Y321 to F substitution (Y321F) within the conserved cytoplasmic tyrosine YXXΦ motif, known for its dual role in endocytosis and cellular signaling of MHC-I. Our findings reveal that the Y321F substitution influences the expression of AMPAR subunits GluA2/3 and leads to alterations in the phosphorylation of key kinases, including Fyn, Lyn, p38, ERK1/2, JNK1/2/3, and p70 S6 kinase. These data illuminate the crucial role of MHC-I in AMPAR function and present a novel mechanism by which MHC-I integrates extracellular cues to modulate synaptic plasticity in neurons, which ultimately underpins learning and memory.
Collapse
Affiliation(s)
- Brett A Eyford
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada
| | - Maciej J Lazarczyk
- Division of Institutional Measures, Department of Medical Direction and Quality, University Hospitals of Geneva, Geneva, Switzerland
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, 1425 Madison Ave, New York, NY, 10029, USA
| | - Kyung Bok Choi
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada
- Department of Microbiology and Immunology, University of British Columbia, 1365-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
- Department of Medical Genetics, University of British Columbia, 1364-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Merina Varghese
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, 1425 Madison Ave, New York, NY, 10029, USA
| | - Hitesh Arora
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
| | - Suresh Kari
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada
- Department of Microbiology and Immunology, University of British Columbia, 1365-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
- Department of Medical Genetics, University of British Columbia, 1364-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Lonna Munro
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada
- Department of Microbiology and Immunology, University of British Columbia, 1365-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
- Department of Medical Genetics, University of British Columbia, 1364-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Cheryl G Pfeifer
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada
- Department of Microbiology and Immunology, University of British Columbia, 1365-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
- Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
- Department of Medical Genetics, University of British Columbia, 1364-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Allison Sowa
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, 1425 Madison Ave, New York, NY, 10029, USA
| | - Daniel R Dickstein
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, 1425 Madison Ave, New York, NY, 10029, USA
| | - Dara L Dickstein
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, 1425 Madison Ave, New York, NY, 10029, USA.
- Department of Pathology, Uniformed Services University of Health Sciences, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
- The Henry M. Jackson Foundation for the Advancement of Military Medicine (HJF), 6720A Rockledge Drive, Bethesda, MD, 20817, USA.
| | - Wilfred A Jefferies
- Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada.
- The Vancouver Prostate Centre, Jack Bell Research Centre, 2660 Oak Street, Vancouver, BC, V6H 3Z6, Canada.
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada.
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada.
- Department of Microbiology and Immunology, University of British Columbia, 1365-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada.
- Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada.
- Department of Medical Genetics, University of British Columbia, 1364-2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada.
| |
Collapse
|
9
|
Tribble JR, Hui F, Quintero H, El Hajji S, Bell K, Di Polo A, Williams PA. Neuroprotection in glaucoma: Mechanisms beyond intraocular pressure lowering. Mol Aspects Med 2023; 92:101193. [PMID: 37331129 DOI: 10.1016/j.mam.2023.101193] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/25/2023] [Accepted: 06/04/2023] [Indexed: 06/20/2023]
Abstract
Glaucoma is a common, complex, multifactorial neurodegenerative disease characterized by progressive dysfunction and then loss of retinal ganglion cells, the output neurons of the retina. Glaucoma is the most common cause of irreversible blindness and affects ∼80 million people worldwide with many more undiagnosed. The major risk factors for glaucoma are genetics, age, and elevated intraocular pressure. Current strategies only target intraocular pressure management and do not directly target the neurodegenerative processes occurring at the level of the retinal ganglion cell. Despite strategies to manage intraocular pressure, as many as 40% of glaucoma patients progress to blindness in at least one eye during their lifetime. As such, neuroprotective strategies that target the retinal ganglion cell and these neurodegenerative processes directly are of great therapeutic need. This review will cover the recent advances from basic biology to on-going clinical trials for neuroprotection in glaucoma covering degenerative mechanisms, metabolism, insulin signaling, mTOR, axon transport, apoptosis, autophagy, and neuroinflammation. With an increased understanding of both the basic and clinical mechanisms of the disease, we are closer than ever to a neuroprotective strategy for glaucoma.
Collapse
Affiliation(s)
- James R Tribble
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Flora Hui
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia; Department of Optometry & Vision Sciences, The University of Melbourne, Melbourne, Australia
| | - Heberto Quintero
- Department of Neuroscience, University of Montreal, Montreal, Canada; Neuroscience Division, Centre de recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada
| | - Sana El Hajji
- Department of Neuroscience, University of Montreal, Montreal, Canada; Neuroscience Division, Centre de recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada
| | - Katharina Bell
- NHMRC Clinical Trials Centre, University of Sydney, Australia; Eye ACP Duke-NUS, Singapore
| | - Adriana Di Polo
- Department of Neuroscience, University of Montreal, Montreal, Canada; Neuroscience Division, Centre de recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada
| | - Pete A Williams
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden.
| |
Collapse
|
10
|
Patil S, Chalkiadaki K, Mergiya TF, Krimbacher K, Amorim IS, Akerkar S, Gkogkas CG, Bramham CR. eIF4E phosphorylation recruits β-catenin to mRNA cap and promotes Wnt pathway translation in dentate gyrus LTP maintenance. iScience 2023; 26:106649. [PMID: 37250335 PMCID: PMC10214474 DOI: 10.1016/j.isci.2023.106649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 03/13/2023] [Accepted: 04/06/2023] [Indexed: 05/31/2023] Open
Abstract
The mRNA cap-binding protein, eukaryotic initiation factor 4E (eIF4E), is crucial for translation and regulated by Ser209 phosphorylation. However, the biochemical and physiological role of eIF4E phosphorylation in translational control of long-term synaptic plasticity is unknown. We demonstrate that phospho-ablated Eif4eS209A Knockin mice are profoundly impaired in dentate gyrus LTP maintenance in vivo, whereas basal perforant path-evoked transmission and LTP induction are intact. mRNA cap-pulldown assays show that phosphorylation is required for synaptic activity-induced removal of translational repressors from eIF4E, allowing initiation complex formation. Using ribosome profiling, we identified selective, phospho-eIF4E-dependent translation of the Wnt signaling pathway in LTP. Surprisingly, the canonical Wnt effector, β-catenin, was massively recruited to the eIF4E cap complex following LTP induction in wild-type, but not Eif4eS209A, mice. These results demonstrate a critical role for activity-evoked eIF4E phosphorylation in dentate gyrus LTP maintenance, remodeling of the mRNA cap-binding complex, and specific translation of the Wnt pathway.
Collapse
Affiliation(s)
- Sudarshan Patil
- Department of Biomedicine Jonas Lies vei 91, University of Bergen, 5009 Bergen, Norway
| | - Kleanthi Chalkiadaki
- Biomedical Research Institute, Foundation for Research and Technology-Hellas, 45110 Ioannina, Greece
| | - Tadiwos F. Mergiya
- Department of Biomedicine Jonas Lies vei 91, University of Bergen, 5009 Bergen, Norway
- Mohn Research Center for the Brain, University of Bergen, Bergen, Norway
| | - Konstanze Krimbacher
- Center for Discovery Brain Sciences, University of Edinburgh, EH8 9XD Edinburgh, UK
| | - Inês S. Amorim
- Center for Discovery Brain Sciences, University of Edinburgh, EH8 9XD Edinburgh, UK
| | - Shreeram Akerkar
- Department of Biomedicine Jonas Lies vei 91, University of Bergen, 5009 Bergen, Norway
| | - Christos G. Gkogkas
- Biomedical Research Institute, Foundation for Research and Technology-Hellas, 45110 Ioannina, Greece
| | - Clive R. Bramham
- Department of Biomedicine Jonas Lies vei 91, University of Bergen, 5009 Bergen, Norway
- Mohn Research Center for the Brain, University of Bergen, Bergen, Norway
| |
Collapse
|
11
|
Lodovichi C, Ratto GM. Control of circadian rhythm on cortical excitability and synaptic plasticity. Front Neural Circuits 2023; 17:1099598. [PMID: 37063387 PMCID: PMC10098176 DOI: 10.3389/fncir.2023.1099598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 03/09/2023] [Indexed: 04/18/2023] Open
Abstract
Living organisms navigate through a cyclic world: activity, feeding, social interactions are all organized along the periodic succession of night and day. At the cellular level, periodic activity is controlled by the molecular machinery driving the circadian regulation of cellular homeostasis. This mechanism adapts cell function to the external environment and its crucial importance is underlined by its robustness and redundancy. The cell autonomous clock regulates cell function by the circadian modulation of mTOR, a master controller of protein synthesis. Importantly, mTOR integrates the circadian modulation with synaptic activity and extracellular signals through a complex signaling network that includes the RAS-ERK pathway. The relationship between mTOR and the circadian clock is bidirectional, since mTOR can feedback on the cellular clock to shift the cycle to maintain the alignment with the environmental conditions. The mTOR and ERK pathways are crucial determinants of synaptic plasticity and function and thus it is not surprising that alterations of the circadian clock cause defective responses to environmental challenges, as witnessed by the bi-directional relationship between brain disorders and impaired circadian regulation. In physiological conditions, the feedback between the intrinsic clock and the mTOR pathway suggests that also synaptic plasticity should undergo circadian regulation.
Collapse
Affiliation(s)
- Claudia Lodovichi
- Institute of Neuroscience, Consiglio Nazionale delle Ricerche (CNR), Padova, Italy
- Veneto Institute of Molecular Medicine (VIMM), Padova, Italy
- Padova Neuroscience Center, Universitá degli Studi di Padova, Padova, Italy
| | - Gian Michele Ratto
- Institute of Neuroscience, Consiglio Nazionale delle Ricerche (CNR), Padova, Italy
- Padova Neuroscience Center, Universitá degli Studi di Padova, Padova, Italy
- National Enterprise for NanoScience and NanoTechnology (NEST), Istituto Nanoscienze, Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore, Pisa, Italy
| |
Collapse
|
12
|
Role of mTOR1 signaling in the antidepressant effects of ketamine and the potential of mTORC1 activators as novel antidepressants. Neuropharmacology 2023; 223:109325. [PMID: 36334763 DOI: 10.1016/j.neuropharm.2022.109325] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/29/2022] [Accepted: 10/31/2022] [Indexed: 11/11/2022]
Abstract
Conventional antidepressant medications act on monoaminergic systems and have important limitations, including a therapeutic delay of weeks to months and low rates of efficacy. Recently, clinical findings have indicated that ketamine, a dissociative anesthetic that blocks N-methyl-d-aspartate receptor channel activity, causes rapid and long-lasting antidepressant effects. Although the exact mechanisms underlying the antidepressant effects of ketamine are not fully known, preclinical studies have demonstrated a key role for mechanistic target of rapamycin complex 1 (mTORC1) signaling and a subsequent increase in synapse formation in the medial prefrontal cortex. In this review, we discuss the role of mTORC1 and its subsequent signaling cascade in the antidepressant effects of ketamine and other compounds with glutamatergic mechanisms of action. We also present the possibility that mTORC1 signaling itself is a drug discovery target.
Collapse
|
13
|
Lin S, Chen C, Ouyang P, Cai Z, Liu X, Abdurahman A, Peng J, Li Y, Zhang Z, Song GL. SELENOM Knockout Induces Synaptic Deficits and Cognitive Dysfunction by Influencing Brain Glucose Metabolism. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:1607-1619. [PMID: 36635091 DOI: 10.1021/acs.jafc.2c07491] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Selenium, a trace element associated with memory impairment and glucose metabolism, mainly exerts its function through selenoproteins. SELENOM is a selenoprotein located in the endoplasmic reticulum (ER) lumen. Our study demonstrates for the first time that SELENOM knockout decreases synaptic plasticity and causes memory impairment in 10-month-old mice. In addition, SELENOM knockout causes hyperglycaemia and disturbs glucose metabolism, which is essential for synapse formation and transmission in the brain. Further research reveals that SELENOM knockout leads to inhibition of the brain insulin signaling pathway [phosphatidylinositol 3-kinase (PI3K)/AKT/mTOR/p70 S6 kinase pathway], which may impair synaptic plasticity in mice. High-fat diet (HFD) feeding suppresses the brain insulin signaling pathway in SELENOM knockout mice and leads to earlier onset of cognitive impairment at 5 months of age. In general, our study demonstrates that SELENOM knockout induces synaptic deficits via the brain insulin signaling pathway, thus leading to cognitive dysfunction in mice. These data strongly suggest that SELENOM plays a vital role in brain glucose metabolism and contributes substantially to synaptic plasticity.
Collapse
Affiliation(s)
- Shujing Lin
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
- Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, Guangdong518000, People's Republic of China
| | - Chen Chen
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Pei Ouyang
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Zhiyu Cai
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Xibei Liu
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Anwar Abdurahman
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Jiaying Peng
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Yu Li
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Zhonghao Zhang
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
| | - Guo-Li Song
- Shenzhen Key Laboratory of Marine Bioresources and Ecology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, Guangdong518060, People's Republic of China
- Shenzhen Bay Laboratory, Shenzhen, Guangdong518000, People's Republic of China
| |
Collapse
|
14
|
Li JB, Hu XY, Chen MW, Xiong CH, Zhao N, Ge YH, Wang H, Gao XL, Xu NJ, Zhao LX, Yu ZH, Chen HZ, Qiu Y. p85S6K sustains synaptic GluA1 to ameliorate cognitive deficits in Alzheimer's disease. Transl Neurodegener 2023; 12:1. [PMID: 36624510 PMCID: PMC9827685 DOI: 10.1186/s40035-022-00334-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 12/26/2022] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Ribosomal protein S6 kinase 1 (S6K1) is a serine-threonine kinase that has two main isoforms: p70S6K (70-kDa isoform) and p85S6K (85-kDa isoform). p70S6K, with its upstream mammalian target of rapamycin (mTOR), has been shown to be involved in learning and memory and participate in the pathophysiology of Alzheimer's disease (AD). However, the function of p85S6K has long been neglected due to its high similarity to p70S6k. The role of p85S6K in learning and memory is still largely unknown. METHODS We fractionated the postsynaptic densities to illustrate the differential distribution of p85S6K and p70S6K. Coimmunoprecipitation was performed to unveil interactions between p85S6K and the GluA1 subunit of AMPA receptor. The roles of p85S6K in synaptic targeting of GluA1 and learning and memory were evaluated by specific knockdown or overexpression of p85S6K followed by a broad range of methodologies including immunofluorescence, Western blot, in situ proximity ligation assay, morphological staining and behavioral examination. Further, the expression level of p85S6K was measured in brains from AD patients and AD model mice. RESULTS p85S6K, but not p70S6K, was enriched in the postsynaptic densities. Moreover, knockdown of p85S6K resulted in defective spatial and recognition memory. In addition, p85S6K could interact with the GluA1 subunit of AMPA receptor through synapse-associated protein 97 and A-kinase anchoring protein 79/150. Mechanistic studies demonstrated that p85S6K could directly phosphorylate GluA1 at Ser845 and increase the amount of GluA1 in synapses, thus sustaining synaptic function and spine densities. Moreover, p85S6K was found to be specifically decreased in the synaptosomal compartment in the brains of AD patients and AD mice. Overexpression of p85S6K ameliorated the synaptic deficits and cognitive impairment in transgenic AD model mice. CONCLUSIONS These results strongly imply a significant role for p85S6K in maintaining synaptic and cognitive function by interacting with GluA1. The findings provide an insight into the rational targeting of p85S6K as a therapeutic potential for AD.
Collapse
Affiliation(s)
- Jia-Bing Li
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Xiao-Yu Hu
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Mu-Wen Chen
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Cai-Hong Xiong
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Na Zhao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Yan-Hui Ge
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Hao Wang
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Xiao-Ling Gao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Nan-Jie Xu
- grid.16821.3c0000 0004 0368 8293Collaborative Innovation Center for Brain Science, Department of Anatomy and Physiology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Lan-Xue Zhao
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Zhi-Hua Yu
- grid.16821.3c0000 0004 0368 8293Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025 China
| | - Hong-Zhuan Chen
- Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China. .,Institute of Interdisciplinary Integrative Biomedical Research, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201210, China.
| | - Yu Qiu
- Department of Pharmacology and Chemical Biology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.
| |
Collapse
|
15
|
Zhang Y, Chen D, Zhang M, Bian J, Qian S, Kou X. Treadmill training attenuate STZ-induced cognitive dysfunction in type 2 diabetic rats via modulating Grb10/IGF-R signaling. Brain Res Bull 2022; 181:12-20. [DOI: 10.1016/j.brainresbull.2022.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 12/14/2021] [Accepted: 01/18/2022] [Indexed: 11/02/2022]
|
16
|
Sun Z, Jia L, Shi D, He Y, Ren Y, Yang J, Ma X. Deep brain stimulation improved depressive-like behaviors and hippocampal synapse deficits by activating the BDNF/mTOR signaling pathway. Behav Brain Res 2022; 419:113709. [PMID: 34890598 DOI: 10.1016/j.bbr.2021.113709] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 11/18/2021] [Accepted: 12/06/2021] [Indexed: 12/17/2022]
Abstract
Our previous study demonstrated that acute deep brain stimulation (DBS) in the ventromedial prefrontal cortex (vmPFC) remarkably improved the depressive-like behaviors in a rat model of chronic unpredictable mild stress (CUS rats). However, the mechanisms by which chronic DBS altered depressive-like behaviors and reversed cognitive impairment have not been clarified. Recent work has shown that deficits in brain-derived neurotrophic factor (BDNF) and its downstream proteins, including mammalian target of rapamycin (mTOR), might be involved in the pathogenesis of depression. Therefore, we hypothesized that the antidepressant-like and cognitive improvement effects of DBS were achieved by activating the BDNF/mTOR pathway. CUS rats received vmPFC DBS at 20 Hz for 1 h once a day for 28 days. After four weeks of stimulation, the rats were assessed for the presence of depressive-like behaviors and euthanized to detect BDNF/mTOR signaling using immunoblots. DBS at the vmPFC significantly ameliorated depressive-like behaviors and spatial learning and memory deficits in the CUS rats. Furthermore, DBS restored the reduced synaptic density in the hippocampus induced by CUS and increased the expression or activity of BDNF, Akt, and mTOR in the hippocampus. Thus, the antidepressant-like effects and cognitive improvement produced by vmPFC DBS might be mediated through increased activity of the BDNF/mTOR signaling pathway.
Collapse
Affiliation(s)
- Zuoli Sun
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Lina Jia
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Dandan Shi
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Yi He
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Yanping Ren
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Jian Yang
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Xin Ma
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| |
Collapse
|
17
|
Moutin E, Sakkaki S, Compan V, Bouquier N, Giona F, Areias J, Goyet E, Hemonnot-Girard AL, Seube V, Glasson B, Benac N, Chastagnier Y, Raynaud F, Audinat E, Groc L, Maurice T, Sala C, Verpelli C, Perroy J. Restoring glutamate receptosome dynamics at synapses rescues autism-like deficits in Shank3-deficient mice. Mol Psychiatry 2021; 26:7596-7609. [PMID: 34331007 DOI: 10.1038/s41380-021-01230-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 07/02/2021] [Accepted: 07/06/2021] [Indexed: 11/09/2022]
Abstract
Shank3 monogenic mutations lead to autism spectrum disorders (ASD). Shank3 is part of the glutamate receptosome that physically links ionotropic NMDA receptors to metabotropic mGlu5 receptors through interactions with scaffolding proteins PSD95-GKAP-Shank3-Homer. A main physiological function of the glutamate receptosome is to control NMDA synaptic function that is required for plasticity induction. Intact glutamate receptosome supports glutamate receptors activation and plasticity induction, while glutamate receptosome disruption blocks receptors activity, preventing the induction of subsequent plasticity. Despite possible impact on metaplasticity and cognitive behaviors, scaffold interaction dynamics and their consequences are poorly defined. Here, we used mGlu5-Homer interaction as a biosensor of glutamate receptosome integrity to report changes in synapse availability for plasticity induction. Combining BRET imaging and electrophysiology, we show that a transient neuronal depolarization inducing NMDA-dependent plasticity disrupts glutamate receptosome in a long-lasting manner at synapses and activates signaling pathways required for the expression of the initiated neuronal plasticity, such as ERK and mTOR pathways. Glutamate receptosome disruption also decreases the NMDA/AMPA ratio, freezing the sensitivity of the synapse to subsequent changes of neuronal activity. These data show the importance of a fine-tuning of protein-protein interactions within glutamate receptosome, driven by changes of neuronal activity, to control plasticity. In a mouse model of ASD, a truncated mutant form of Shank3 prevents the integrity of the glutamate receptosome. These mice display altered plasticity, anxiety-like, and stereotyped behaviors. Interestingly, repairing the integrity of glutamate receptosome and its sensitivity to the neuronal activity rescued synaptic transmission, plasticity, and some behavioral traits of Shank3∆C mice. Altogether, our findings characterize mechanisms by which Shank3 mutations cause ASD and highlight scaffold dynamics as new therapeutic target.
Collapse
Affiliation(s)
- Enora Moutin
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France.
| | - Sophie Sakkaki
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Vincent Compan
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | | | | - Julie Areias
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Elise Goyet
- Interdisciplinary Institute for NeuroScience, CNRS, UMR 5297, Centre Broca Nouvelle-Aquitaine, 33076, Bordeaux, France
| | | | - Vincent Seube
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Bastien Glasson
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Nathan Benac
- Interdisciplinary Institute for NeuroScience, CNRS, UMR 5297, Centre Broca Nouvelle-Aquitaine, 33076, Bordeaux, France
| | - Yan Chastagnier
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Fabrice Raynaud
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France.,PhyMedExp, Univ Montpellier, INSERM, CNRS, CHU de Montpellier, France
| | - Etienne Audinat
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Laurent Groc
- Interdisciplinary Institute for NeuroScience, CNRS, UMR 5297, Centre Broca Nouvelle-Aquitaine, 33076, Bordeaux, France
| | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Carlo Sala
- Cnr Neuroscience Institute, 3220129, Milan, Italy
| | | | - Julie Perroy
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France.
| |
Collapse
|
18
|
Hernandez SJ, Fote G, Reyes-Ortiz AM, Steffan JS, Thompson LM. Cooperation of cell adhesion and autophagy in the brain: Functional roles in development and neurodegenerative disease. Matrix Biol Plus 2021; 12:100089. [PMID: 34786551 PMCID: PMC8579148 DOI: 10.1016/j.mbplus.2021.100089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/11/2021] [Accepted: 10/18/2021] [Indexed: 12/19/2022] Open
Abstract
Cellular adhesive connections directed by the extracellular matrix (ECM) and maintenance of cellular homeostasis by autophagy are seemingly disparate functions that are molecularly intertwined, each regulating the other. This is an emerging field in the brain where the interplay between adhesion and autophagy functions at the intersection of neuroprotection and neurodegeneration. The ECM and adhesion proteins regulate autophagic responses to direct protein clearance and guide regenerative programs that go awry in brain disorders. Concomitantly, autophagic flux acts to regulate adhesion dynamics to mediate neurite outgrowth and synaptic plasticity with functional disruption contributed by neurodegenerative disease. This review highlights the cooperative exchange between cellular adhesion and autophagy in the brain during health and disease. As the mechanistic alliance between adhesion and autophagy has been leveraged therapeutically for metastatic disease, understanding overlapping molecular functions that direct the interplay between adhesion and autophagy might uncover therapeutic strategies to correct or compensate for neurodegeneration.
Collapse
Affiliation(s)
- Sarah J. Hernandez
- Neurobiology and Behavior, University of California Irvine, Irvine, CA 92697, USA
- Sue and Bill Gross Stem Cell Research Center, University of California Irvine, Irvine, CA 92697, USA
| | - Gianna Fote
- Department of Biological Chemistry, University of California Irvine, Irvine, CA 92697, USA
| | - Andrea M. Reyes-Ortiz
- Sue and Bill Gross Stem Cell Research Center, University of California Irvine, Irvine, CA 92697, USA
- Department of Biological Chemistry, University of California Irvine, Irvine, CA 92697, USA
| | - Joan S. Steffan
- Psychaitry and Human Behavior, University of California Irvine, Irvine, CA 92697, USA
- Institute of Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, CA 92617, USA
| | - Leslie M. Thompson
- Neurobiology and Behavior, University of California Irvine, Irvine, CA 92697, USA
- Sue and Bill Gross Stem Cell Research Center, University of California Irvine, Irvine, CA 92697, USA
- Department of Biological Chemistry, University of California Irvine, Irvine, CA 92697, USA
- Psychaitry and Human Behavior, University of California Irvine, Irvine, CA 92697, USA
- Institute of Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, CA 92617, USA
| |
Collapse
|
19
|
Conde-Dusman MJ, Dey PN, Elía-Zudaire Ó, Rabaneda LG, García-Lira C, Grand T, Briz V, Velasco ER, Andero R, Niñerola S, Barco A, Paoletti P, Wesseling JF, Gardoni F, Tavalin SJ, Perez-Otaño I. Control of protein synthesis and memory by GluN3A-NMDA receptors through inhibition of GIT1/mTORC1 assembly. eLife 2021; 10:e71575. [PMID: 34787081 PMCID: PMC8598234 DOI: 10.7554/elife.71575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/13/2021] [Indexed: 12/03/2022] Open
Abstract
De novo protein synthesis is required for synapse modifications underlying stable memory encoding. Yet neurons are highly compartmentalized cells and how protein synthesis can be regulated at the synapse level is unknown. Here, we characterize neuronal signaling complexes formed by the postsynaptic scaffold GIT1, the mechanistic target of rapamycin (mTOR) kinase, and Raptor that couple synaptic stimuli to mTOR-dependent protein synthesis; and identify NMDA receptors containing GluN3A subunits as key negative regulators of GIT1 binding to mTOR. Disruption of GIT1/mTOR complexes by enhancing GluN3A expression or silencing GIT1 inhibits synaptic mTOR activation and restricts the mTOR-dependent translation of specific activity-regulated mRNAs. Conversely, GluN3A removal enables complex formation, potentiates mTOR-dependent protein synthesis, and facilitates the consolidation of associative and spatial memories in mice. The memory enhancement becomes evident with light or spaced training, can be achieved by selectively deleting GluN3A from excitatory neurons during adulthood, and does not compromise other aspects of cognition such as memory flexibility or extinction. Our findings provide mechanistic insight into synaptic translational control and reveal a potentially selective target for cognitive enhancement.
Collapse
Affiliation(s)
- María J Conde-Dusman
- lnstituto de Neurociencias (UMH-CSIC)AlicanteSpain
- Centro de Investigación Médica Aplicada (CIMA), University of NavarraPamplonaSpain
- Centre for Developmental Neurobiology, Institute of Psychiatry, King’s College LondonLondonUnited Kingdom
| | - Partha N Dey
- Centro de Investigación Médica Aplicada (CIMA), University of NavarraPamplonaSpain
- National Eye Institute, National Institutes of HealthBethesdaUnited States
| | | | - Luis G Rabaneda
- lnstituto de Neurociencias (UMH-CSIC)AlicanteSpain
- Centro de Investigación Médica Aplicada (CIMA), University of NavarraPamplonaSpain
- Institute of Science and Technology AustriaKlosterneuburgAustria
| | | | - Teddy Grand
- Institut de Biologie de l’Ecole Normale Supérieure/CNRS/INSERMParisFrance
| | - Victor Briz
- Centro de Biología Molecular Severo Ochoa (UAM-CSIC)MadridSpain
| | - Eric R Velasco
- Institut de Neurociències, Universitat Autònoma de BarcelonaBellaterraSpain
| | - Raül Andero
- Institut de Neurociències, Departament de Psicobiologia i de Metodologia de les Ciències de la Salut, Unitat de Neurociència Traslacional, Parc Taulí Hospital Universitari, Institut d’Investigació i Innovació Parc Taulí (I3PT), Universitat Autònoma de BarcelonaBellaterraSpain
- Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Instituto de Salud Carlos IIIMadridSpain
- ICREABarcelonaSpain
| | | | - Angel Barco
- lnstituto de Neurociencias (UMH-CSIC)AlicanteSpain
| | - Pierre Paoletti
- Institut de Biologie de l’Ecole Normale Supérieure/CNRS/INSERMParisFrance
| | | | - Fabrizio Gardoni
- Department of Pharmacological and Biomolecular Sciences, University of MilanMilanItaly
| | - Steven J Tavalin
- Department of Pharmacology, Addiction Science, and Toxicology, University of Tennessee Health Science CenterMemphisUnited States
| | - Isabel Perez-Otaño
- lnstituto de Neurociencias (UMH-CSIC)AlicanteSpain
- Centro de Investigación Médica Aplicada (CIMA), University of NavarraPamplonaSpain
| |
Collapse
|
20
|
Garcia-Romeu A, Darcy S, Jackson H, White T, Rosenberg P. Psychedelics as Novel Therapeutics in Alzheimer's Disease: Rationale and Potential Mechanisms. Curr Top Behav Neurosci 2021; 56:287-317. [PMID: 34734390 DOI: 10.1007/7854_2021_267] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Serotonin 2A receptor (5-HT2AR) agonist "classic psychedelics" are drawing increasing interest as potential mental health treatments. Recent work suggests psychedelics can exert persisting anxiolytic and antidepressant effects lasting up to several months after a single administration. Data indicate acute subjective drug effects as important psychological factors involved in observed therapeutic benefits. Additionally, animal models have shown an important role for 5-HT2AR agonists in modulating learning and memory function with relevance for Alzheimer's Disease (AD) and related dementias. A number of biological mechanisms of action are under investigation to elucidate 5-HT2AR agonists' therapeutic potential, including enhanced neuroplasticity, anti-inflammatory effects, and alterations in brain functional connectivity. These diverse lines of research are reviewed here along with a discussion of AD pathophysiology and neuropsychiatric symptoms to highlight classic psychedelics as potential novel pharmacotherapies for patients with AD. Human clinical research suggests a possible role for high-dose psychedelic administration in symptomatic treatment of depressed mood and anxiety in early-stage AD. Preclinical data indicate a potential for low- or high-dose psychedelic treatment regimens to slow or reverse brain atrophy, enhance cognitive function, and slow progression of AD. In conclusion, rationale and potential approaches for preliminary research with psychedelics in patients with AD are presented, and ramifications of this line of investigation for development of novel AD treatments are discussed.
Collapse
Affiliation(s)
- Albert Garcia-Romeu
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- Center for Psychedelic and Consciousness Research, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Sean Darcy
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Center for Psychedelic and Consciousness Research, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hillary Jackson
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Center for Psychedelic and Consciousness Research, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Toni White
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Memory and Alzheimer's Treatment Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Paul Rosenberg
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Memory and Alzheimer's Treatment Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| |
Collapse
|
21
|
mTOR Knockdown in the Infralimbic Cortex Evokes A Depressive-like State in Mouse. Int J Mol Sci 2021; 22:ijms22168671. [PMID: 34445375 PMCID: PMC8395521 DOI: 10.3390/ijms22168671] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/08/2021] [Accepted: 08/09/2021] [Indexed: 12/21/2022] Open
Abstract
Fast and sustained antidepressant effects of ketamine identified the mammalian target of rapamycin (mTOR) signaling pathway as the main modulator of its antidepressive effects. Thus, mTOR signaling has become integral for the preclinical evaluation of novel compounds to treat depression. However, causality between mTOR and depression has yet to be determined. To address this, we knocked down mTOR expression in mice using an acute intracerebral infusion of small interfering RNAs (siRNA) in the infralimbic (IL) or prelimbic (PrL) cortices of the medial prefrontal cortex (mPFC), and evaluated depressive- and anxious-like behaviors. mTOR knockdown in IL, but not PrL, cortex produced a robust depressive-like phenotype in mice, as assessed in the forced swimming test (FST) and the tail suspension test (TST). This phenotype was associated with significant reductions of mTOR mRNA and protein levels 48 h post-infusion. In parallel, decreased brain-derived neurotrophic factor (BDNF) expression was found bilaterally in both IL and PrL cortices along with a dysregulation of serotonin (5-HT) and glutamate (Glu) release in the dorsal raphe nucleus (DRN). Overall, our results demonstrate causality between mTOR expression in the IL cortex and depressive-like behaviors, but not in anxiety.
Collapse
|
22
|
Khamsing D, Lebrun S, Fanget I, Larochette N, Tourain C, de Sars V, Brunstein M, Oheim M, Carrel D, Darchen F, Desnos C. A role for BDNF- and NMDAR-induced lysosomal recruitment of mTORC1 in the regulation of neuronal mTORC1 activity. Mol Brain 2021; 14:112. [PMID: 34247625 PMCID: PMC8273036 DOI: 10.1186/s13041-021-00820-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 06/30/2021] [Indexed: 12/15/2022] Open
Abstract
Memory and long term potentiation require de novo protein synthesis. A key regulator of this process is mTORC1, a complex comprising the mTOR kinase. Growth factors activate mTORC1 via a pathway involving PI3-kinase, Akt, the TSC complex and the GTPase Rheb. In non-neuronal cells, translocation of mTORC1 to late endocytic compartments (LEs), where Rheb is enriched, is triggered by amino acids. However, the regulation of mTORC1 in neurons remains unclear. In mouse hippocampal neurons, we observed that BDNF and treatments activating NMDA receptors trigger a robust increase in mTORC1 activity. NMDA receptors activation induced a significant recruitment of mTOR onto lysosomes even in the absence of external amino acids, whereas mTORC1 was evenly distributed in neurons under resting conditions. NMDA receptor-induced mTOR translocation to LEs was partly dependent on the BDNF receptor TrkB, suggesting that BDNF contributes to the effect of NMDA receptors on mTORC1 translocation. In addition, the combination of Rheb overexpression and artificial mTORC1 targeting to LEs by means of a modified component of mTORC1 fused with a LE-targeting motif strongly activated mTOR. To gain spatial and temporal control over mTOR localization, we designed an optogenetic module based on light-sensitive dimerizers able to recruit mTOR on LEs. In cells expressing this optogenetic tool, mTOR was translocated to LEs upon photoactivation. In the absence of growth factor, this was not sufficient to activate mTORC1. In contrast, mTORC1 was potently activated by a combination of BDNF and photoactivation. The data demonstrate that two important triggers of synaptic plasticity, BDNF and NMDA receptors, synergistically power the two arms of the mTORC1 activation mechanism, i.e., mTORC1 translocation to LEs and Rheb activation. Moreover, they unmask a functional link between NMDA receptors and mTORC1 that could underlie the changes in the synaptic proteome associated with long-lasting changes in synaptic strength.
Collapse
Affiliation(s)
- Dany Khamsing
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France
| | - Solène Lebrun
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France
| | - Isabelle Fanget
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France
| | - Nathanaël Larochette
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France.,Université de Paris, Centre National de la Recherche Scientifique, INSERM, B3OA, Paris, France, Ecole Nationale Vétérinaire d'Alfort, B3OA, Maisons-Alfort, France
| | - Christophe Tourain
- Wavefront-Engineering Microscopy Group, Sorbonne Université, INSERM S968, CNRS UMR7210, Institut de la Vision, Paris, France
| | - Vincent de Sars
- Wavefront-Engineering Microscopy Group, Sorbonne Université, INSERM S968, CNRS UMR7210, Institut de la Vision, Paris, France
| | - Maia Brunstein
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France
| | - Martin Oheim
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France
| | - Damien Carrel
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France.
| | - François Darchen
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France.,Service de Psychiatrie Infanto-Juvénile, Centre Hospitalier de Gonesse, 2 Boulevard du 19 mars 1962, 95500, Gonesse, France
| | - Claire Desnos
- Saints-Pères Paris Institute for the Neurosciences, Université de Paris, Centre National de la Recherche Scientifique UMR 8003, 45 rue des Saints Pères, 75006, Paris, France.
| |
Collapse
|
23
|
Querfurth H, Lee HK. Mammalian/mechanistic target of rapamycin (mTOR) complexes in neurodegeneration. Mol Neurodegener 2021; 16:44. [PMID: 34215308 PMCID: PMC8252260 DOI: 10.1186/s13024-021-00428-5] [Citation(s) in RCA: 106] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 02/01/2021] [Indexed: 12/12/2022] Open
Abstract
Novel targets to arrest neurodegeneration in several dementing conditions involving misfolded protein accumulations may be found in the diverse signaling pathways of the Mammalian/mechanistic target of rapamycin (mTOR). As a nutrient sensor, mTOR has important homeostatic functions to regulate energy metabolism and support neuronal growth and plasticity. However, in Alzheimer's disease (AD), mTOR alternately plays important pathogenic roles by inhibiting both insulin signaling and autophagic removal of β-amyloid (Aβ) and phospho-tau (ptau) aggregates. It also plays a role in the cerebrovascular dysfunction of AD. mTOR is a serine/threonine kinase residing at the core in either of two multiprotein complexes termed mTORC1 and mTORC2. Recent data suggest that their balanced actions also have implications for Parkinson's disease (PD) and Huntington's disease (HD), Frontotemporal dementia (FTD) and Amyotrophic Lateral Sclerosis (ALS). Beyond rapamycin; an mTOR inhibitor, there are rapalogs having greater tolerability and micro delivery modes, that hold promise in arresting these age dependent conditions.
Collapse
Affiliation(s)
- Henry Querfurth
- Department of Neurology, Tufts Medical Center, Boston, Massachusetts, USA.
| | - Han-Kyu Lee
- Department of Neurology, Tufts Medical Center, Boston, Massachusetts, USA
| |
Collapse
|
24
|
Reconsolidation of a post-ingestive nutrient memory requires mTOR in the central amygdala. Mol Psychiatry 2021; 26:2820-2836. [PMID: 32873898 DOI: 10.1038/s41380-020-00874-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 08/04/2020] [Accepted: 08/21/2020] [Indexed: 01/22/2023]
Abstract
The central control of feeding behavior and metabolic homeostasis has been proposed to involve a form of post-ingestive nutrient learning independent of the gustatory value of food. However, after such learning, it is unknown which brain regions or circuits are activated to retrieve the stored memory and whether this memory undergoes reconsolidation that depends on protein synthesis after its reactivation through retrieval. In the present study, using a conditioned-flavor-preference paradigm by associating flavors with intra-gastric infusion of glucose to minimize the evaluation of the taste of food, we show that retrieval of the post-ingestive nutrient-conditioned flavor memory stimulates multiple brain regions in mice, including the central nucleus of the amygdala (CeA). Moreover, memory retrieval activated the mammalian target of rapamycin complex 1 (mTORC1) in the CeA, while site-specific or systemic inhibition of mTORC1 immediately after retrieval prevented the subsequent expression of the post-ingestive nutrient-associated flavor memory, leading to a long-lasting suppression of reinstatement. Taken together, our findings suggest that the reconsolidation process of a post-ingestive nutrient memory modulates food preferences.
Collapse
|
25
|
Multiple signaling pathways are essential for synapse formation induced by synaptic adhesion molecules. Proc Natl Acad Sci U S A 2021; 118:2000173118. [PMID: 33431662 DOI: 10.1073/pnas.2000173118] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Little is known about the cellular signals that organize synapse formation. To explore what signaling pathways may be involved, we employed heterologous synapse formation assays in which a synaptic adhesion molecule expressed in a nonneuronal cell induces pre- or postsynaptic specializations in cocultured neurons. We found that interfering pharmacologically with microtubules or actin filaments impaired heterologous synapse formation, whereas blocking protein synthesis had no effect. Unexpectedly, pharmacological inhibition of c-jun N-terminal kinases (JNKs), protein kinase-A (PKA), or AKT kinases also suppressed heterologous synapse formation, while inhibition of other tested signaling pathways-such as MAP kinases or protein kinase C-did not alter heterologous synapse formation. JNK and PKA inhibitors suppressed formation of both pre- and postsynaptic specializations, whereas AKT inhibitors impaired formation of post- but not presynaptic specializations. To independently test whether heterologous synapse formation depends on AKT signaling, we targeted PTEN, an enzyme that hydrolyzes phosphatidylinositol 3-phosphate and thereby prevents AKT kinase activation, to postsynaptic sites by fusing PTEN to Homer1. Targeting PTEN to postsynaptic specializations impaired heterologous postsynaptic synapse formation induced by presynaptic adhesion molecules, such as neurexins and additionally decreased excitatory synapse function in cultured neurons. Taken together, our results suggest that heterologous synapse formation is driven via a multifaceted and multistage kinase network, with diverse signals organizing pre- and postsynaptic specializations.
Collapse
|
26
|
Dissociation of functional and structural plasticity of dendritic spines during NMDAR and mGluR-dependent long-term synaptic depression in wild-type and fragile X model mice. Mol Psychiatry 2021; 26:4652-4669. [PMID: 32606374 PMCID: PMC8095717 DOI: 10.1038/s41380-020-0821-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 06/03/2020] [Accepted: 06/12/2020] [Indexed: 12/14/2022]
Abstract
Many neurodevelopmental disorders are characterized by impaired functional synaptic plasticity and abnormal dendritic spine morphology, but little is known about how these are related. Previous work in the Fmr1-/y mouse model of fragile X (FX) suggests that increased constitutive dendritic protein synthesis yields exaggerated mGluR5-dependent long-term synaptic depression (LTD) in area CA1 of the hippocampus, but an effect on spine structural plasticity remains to be determined. In the current study, we used simultaneous electrophysiology and time-lapse two photon imaging to examine how spines change their structure during LTD induced by activation of mGluRs or NMDA receptors (NMDARs), and how this plasticity is altered in Fmr1-/y mice. We were surprised to find that mGluR activation causes LTD and AMPA receptor internalization, but no spine shrinkage in either wildtype or Fmr1-/y mice. In contrast, NMDAR activation caused spine shrinkage as well as LTD in both genotypes. Spine shrinkage was initiated by non-ionotropic (metabotropic) signaling through NMDARs, and in wild-type mice this structural plasticity required activation of mTORC1 and new protein synthesis. In striking contrast, NMDA-induced spine plasticity in Fmr1-/y mice was no longer dependent on acute activation of mTORC1 or de novo protein synthesis. These findings reveal that the structural consequences of mGluR and metabotropic NMDAR activation differ, and that a brake on spine structural plasticity, normally provided by mTORC1 regulation of protein synthesis, is absent in FX. Increased constitutive protein synthesis in FX appears to modify functional and structural plasticity induced through different glutamate receptors.
Collapse
|
27
|
Mukhtar I. Inflammatory and immune mechanisms underlying epileptogenesis and epilepsy: From pathogenesis to treatment target. Seizure 2020; 82:65-79. [PMID: 33011590 DOI: 10.1016/j.seizure.2020.09.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 09/15/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023] Open
Abstract
Epilepsy is a brain disease associated with epileptic seizures as well as with neurobehavioral outcomes of this condition. In the last century, inflammation emerged as a crucial factor in epilepsy etiology. Various brain insults through activation of neuronal and non-neuronal brain cells initiate a series of inflammatory events. Growing observations strongly suggest that abnormal activation of critical inflammatory processes contributes to epileptogenesis, a gradual process by which a normal brain transforms into the epileptic brain. Increased knowledge of inflammatory pathways in epileptogenesis has unveiled mechanistic targets for novel antiepileptic therapies. Molecules specifically targeting the pivotal inflammatory pathways may serve as promising candidates to halt the development of epilepsy. The present paper reviews the pieces of evidence conceptually supporting the potential role of inflammatory mechanisms and the relevant blood-brain barrier (BBB) disruption in epileptogenesis. Also, it discusses the mechanisms underlying inflammation-induced neuronal-glial network impairment and highlights innovative neuroregulatory actions of typical inflammatory molecules. Finally, it presents a brief analysis of observations supporting the therapeutic role of inflammation-targeting tiny molecules in epileptic seizures.
Collapse
Affiliation(s)
- Iqra Mukhtar
- H.E.J Research Institute of Chemistry, International Center For Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan; Department of Pharmacology, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan.
| |
Collapse
|
28
|
Huang C, Wen C, Yang M, Li A, Fan C, Gan D, Li Q, Zhao J, Zhu L, Lu D. Astaxanthin Improved the Cognitive Deficits in APP/PS1 Transgenic Mice Via Selective Activation of mTOR. J Neuroimmune Pharmacol 2020; 16:609-619. [PMID: 32944864 DOI: 10.1007/s11481-020-09953-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 08/26/2020] [Indexed: 01/20/2023]
Abstract
Astaxanthin (Ast) is an effective neuroprotective and antioxidant compound used to treat Alzheimer's disease (AD); however, the underlying in vivo molecular mechanisms remain unknown. In this study, we report that Ast can activate the mammalian target of rapamycin (mTOR) pathway in the 8-month-old APP/PS1 transgenic mouse model of AD. Our results suggest that Ast could ameliorate the cognitive defects in APP/PS1 mice by activating the mTOR pathway. Moreover, mTOR activation perturbed the mitochondrial dynamics, increased the synaptic plasticity after 21 days of treatment with Ast (10 mg/kg/day), and increased the expression of Aβ-degrading enzymes, mitochondrial fusion, and synapse-associated proteins and decreased the expression of mitochondrial fission proteins. Intraperitoneal injection of the mTOR inhibitor, rapamycin, abolished the effects of Ast. In conclusion, Ast activates the mTOR pathway, which is necessary for mitochondrial dynamics and synaptic plasticity, leading to improved learning and memory. Our results support the use of Ast for the treatment of cognitive deficits. Graphical abstract In summary, Ast ameliorates cognitive deficits via facilitating the mTOR-dependent mitochondrial dynamics and synaptic damage, and reducing Aβ accumulation. This model supports the use of Ast for the treatment of cognitive deficits.
Collapse
Affiliation(s)
- Cuiqin Huang
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Caiyan Wen
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Mei Yang
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - An Li
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Chongzhu Fan
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Danhui Gan
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Qin Li
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Jiayi Zhao
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Lihong Zhu
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China
| | - Daxiang Lu
- Department of Pathophysiology, Institute of Brain Science Research, Key Laboratory of State Administration of Traditional Chinese Medicine of the People's Republic of China, School of Medicine, Jinan University, 510632, Guangzhou, Guangdong, China.
| |
Collapse
|
29
|
Calabrese V, Di Maio A, Marino G, Cardinale A, Natale G, De Rosa A, Campanelli F, Mancini M, Napolitano F, Avallone L, Calabresi P, Usiello A, Ghiglieri V, Picconi B. Rapamycin, by Inhibiting mTORC1 Signaling, Prevents the Loss of Striatal Bidirectional Synaptic Plasticity in a Rat Model of L-DOPA-Induced Dyskinesia. Front Aging Neurosci 2020; 12:230. [PMID: 32848709 PMCID: PMC7431470 DOI: 10.3389/fnagi.2020.00230] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 06/30/2020] [Indexed: 12/16/2022] Open
Abstract
Levodopa (L-DOPA) treatment is the main gold-standard therapy for Parkinson disease (PD). Besides good antiparkinsonian effects, prolonged use of this drug is associated to the development of involuntary movements known as L-DOPA-induced dyskinesia (LID). L-DOPA-induced dyskinesia is linked to a sensitization of dopamine (DA) D1 receptors located on spiny projection neurons (SPNs) of the dorsal striatum. Several evidences have shown that the emergence of LID can be related to striatal D1/cAMP/PKA/DARPP-32 and extracellular signal-regulated kinases (ERK1/2) pathway overactivation associated to aberrant N-methyl-d-aspartate (NMDA) receptor function. In addition, within striatum, ERK1/2 is also able to modulate in a D1 receptor-dependent manner the activity of the mammalian target of rapamycin complex 1 (mTORC1) pathway under DA depletion and L-DOPA therapy. Consistently, increased mTORC1 signaling appears during chronic administration of L-DOPA and shows a high correlation with the severity of dyskinesia. Furthermore, the abnormal activation of the D1/PKA/DARPP-32 cascade is paralleled by increased phosphorylation of the GluA1 subunit of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor at the PKA Ser845 site. The GluA1 promotes excitatory AMPA receptor-mediated transmission and may be implicated in the alterations found at the corticostriatal synapses of dyskinetic animals. In our study, we investigated the role of mTORC1 pathway activation in modulating bidirectional striatal synaptic plasticity in L-DOPA-treated parkinsonian rats. Inhibition of mTORC1 by coadministration of rapamycin to L-DOPA was able to limit the magnitude of LID expression, accounting for a therapeutic effect of this drug. In particular, behavioral data showed that, in L-DOPA-treated rats, rapamycin administration induced a selective decrease of distinct components of abnormal involuntary movements (i.e., axial and orolingual dyskinesia). Furthermore, ex vivo patch clamp and intracellular recordings of SPNs revealed that pharmacological inhibition of mTORC1 also resulted associated with a physiological bidirectional plasticity, when compared to dyskinetic rats treated with L-DOPA alone. This study uncovers the important role of mTORC1 inhibition to prevent the loss of striatal bidirectional plasticity under chronic L-DOPA treatment in rodent models of PD.
Collapse
Affiliation(s)
- Valeria Calabrese
- Laboratory of Experimental Neurophysiology, IRCCS San Raffaele Pisana, Rome, Italy.,Department of Medicine, University of Perugia, Perugia, Italy
| | | | - Gioia Marino
- Department of Medicine, University of Perugia, Perugia, Italy.,Laboratory of Neurophysiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Antonella Cardinale
- Laboratory of Experimental Neurophysiology, IRCCS San Raffaele Pisana, Rome, Italy.,Department of Medicine, University of Perugia, Perugia, Italy
| | - Giuseppina Natale
- Department of Medicine, University of Perugia, Perugia, Italy.,Laboratory of Neurophysiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Arianna De Rosa
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Federica Campanelli
- Department of Medicine, University of Perugia, Perugia, Italy.,Laboratory of Neurophysiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Maria Mancini
- Laboratory of Neurophysiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Francesco Napolitano
- CEINGE Biotecnologie Avanzate, Naples, Italy.,Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, Naples, Italy
| | - Luigi Avallone
- Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, Naples, Italy
| | - Paolo Calabresi
- Neurologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy.,Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Alessandro Usiello
- CEINGE Biotecnologie Avanzate, Naples, Italy.,Department of Environmental, Biological and Pharmaceutical Sciences and Technologies (DISTABIF), University of Campania Luigi Vanvitelli, Caserta, Italy
| | - Veronica Ghiglieri
- Department of Medicine, University of Perugia, Perugia, Italy.,Laboratory of Neurophysiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Barbara Picconi
- Laboratory of Experimental Neurophysiology, IRCCS San Raffaele Pisana, Rome, Italy.,Università Telematica San Raffaele, Rome, Italy
| |
Collapse
|
30
|
Shen H, Zhu H, Panja D, Gu Q, Li Z. Autophagy controls the induction and developmental decline of NMDAR-LTD through endocytic recycling. Nat Commun 2020; 11:2979. [PMID: 32532981 PMCID: PMC7293213 DOI: 10.1038/s41467-020-16794-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 05/18/2020] [Indexed: 01/08/2023] Open
Abstract
NMDA receptor-dependent long-term depression (NMDAR-LTD) is a long-lasting form of synaptic plasticity. Its expression is mediated by the removal of AMPA receptors from postsynaptic membranes. Under basal conditions, endocytosed AMPA receptors are rapidly recycled back to the plasma membrane. In NMDAR-LTD, however, they are diverted to late endosomes for degradation. The mechanism for this switch is largely unclear. Additionally, the inducibility of NMDAR-LTD is greatly reduced in adulthood. The underlying mechanism and physiological significance of this phenomenon are elusive. Here, we report that autophagy inhibition is essential for the induction and developmental dampening of NMDAR-LTD. Autophagy is inhibited during NMDAR-LTD to decrease endocytic recycling. Autophagy inhibition is both necessary and sufficient for LTD induction. In adulthood, autophagy is up-regulated to make LTD induction harder, thereby preventing the adverse effect of excessive LTD on memory consolidation. These findings reveal the unrecognized functions of autophagy in synaptic plasticity, endocytic recycling, and memory. NMDA receptor-dependent long-term depression (NMDAR-LTD) is a form of synaptic plasticity mediated by reduced recycling of AMPA receptors to the plasma membrane. Here the authors show that autophagy is a regulator of this endocytic recycling and autophagy upregulation dampens NMDAR-LTD in adulthood.
Collapse
Affiliation(s)
- Hongmei Shen
- Section on Synapse Development and Plasticity, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA.,Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education & Co-innovation Center of Neuroregeneration, Nantong University, Nantong, 226001, China.,Nantong Brain Hospital & Mental Health Center Affiliated to Nantong University, Nantong University, Nantong, 226005, China
| | - Huiwen Zhu
- Section on Synapse Development and Plasticity, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Debabrata Panja
- Section on Synapse Development and Plasticity, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Qinhua Gu
- Section on Synapse Development and Plasticity, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Zheng Li
- Section on Synapse Development and Plasticity, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA.
| |
Collapse
|
31
|
Uddin MS, Rahman MA, Kabir MT, Behl T, Mathew B, Perveen A, Barreto GE, Bin-Jumah MN, Abdel-Daim MM, Ashraf GM. Multifarious roles of mTOR signaling in cognitive aging and cerebrovascular dysfunction of Alzheimer's disease. IUBMB Life 2020; 72:1843-1855. [PMID: 32472959 DOI: 10.1002/iub.2324] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/10/2020] [Accepted: 05/13/2020] [Indexed: 12/19/2022]
Abstract
Age-related cognitive failure is a main devastating incident affecting even healthy people. Alzheimer's disease (AD) is the utmost common form of dementia among the geriatric community. In the pathogenesis of AD, cerebrovascular dysfunction is revealed before the beginning of the cognitive decline. Mounting proof shows a precarious impact of cerebrovascular dysregulation in the development of AD pathology. Recent studies document that the mammalian target of rapamycin (mTOR) acts as a crucial effector of cerebrovascular dysregulation in AD. The mTOR contributes to brain vascular dysfunction and subsequence cerebral blood flow deficits as well as cognitive impairment. Furthermore, mTOR causes the blood-brain barrier (BBB) breakdown in AD models. Inhibition of mTOR hyperactivity protects the BBB integrity in AD. Furthermore, mTOR drives cognitive defect and cerebrovascular dysfunction, which are greatly prevalent in AD, but the central molecular mechanisms underlying these alterations are obscure. This review represents the crucial and current research findings regarding the role of mTOR signaling in cognitive aging and cerebrovascular dysfunction in the pathogenesis of AD.
Collapse
Affiliation(s)
- Md Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh.,Pharmakon Neuroscience Research Network, Dhaka, Bangladesh
| | - Md Ataur Rahman
- Center for Neuroscience, Brain Science Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | | | - Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Patiala, India
| | - Bijo Mathew
- Division of Drug Design and Medicinal Chemistry Research Lab, Department of Pharmaceutical Chemistry, Ahalia School of Pharmacy, Palakkad, India
| | - Asma Perveen
- Glocal School of Life Sciences, Glocal University, Saharanpur, India
| | - George E Barreto
- Department of Biological Sciences, University of Limerick, Limerick, Ireland.,Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Santiago, Chile
| | - May N Bin-Jumah
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Mohamed M Abdel-Daim
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia.,Pharmacology Department, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Ghulam Md Ashraf
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| |
Collapse
|
32
|
Rantamäki T, Kohtala S. Encoding, Consolidation, and Renormalization in Depression: Synaptic Homeostasis, Plasticity, and Sleep Integrate Rapid Antidepressant Effects. Pharmacol Rev 2020; 72:439-465. [DOI: 10.1124/pr.119.018697] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
33
|
Choe HK, Cho J. Comprehensive Genome-Wide Approaches to Activity-Dependent Translational Control in Neurons. Int J Mol Sci 2020; 21:ijms21051592. [PMID: 32111062 PMCID: PMC7084349 DOI: 10.3390/ijms21051592] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 02/21/2020] [Accepted: 02/25/2020] [Indexed: 02/06/2023] Open
Abstract
Activity-dependent regulation of gene expression is critical in experience-mediated changes in the brain. Although less appreciated than transcriptional control, translational control is a crucial regulatory step of activity-mediated gene expression in physiological and pathological conditions. In the first part of this review, we overview evidence demonstrating the importance of translational controls under the context of synaptic plasticity as well as learning and memory. Then, molecular mechanisms underlying the translational control, including post-translational modifications of translation factors, mTOR signaling pathway, and local translation, are explored. We also summarize how activity-dependent translational regulation is associated with neurodevelopmental and psychiatric disorders, such as autism spectrum disorder and depression. In the second part, we highlight how recent application of high-throughput sequencing techniques has added insight into genome-wide studies on translational regulation of neuronal genes. Sequencing-based strategies to identify molecular signatures of the active neuronal population responding to a specific stimulus are discussed. Overall, this review aims to highlight the implication of translational control for neuronal gene regulation and functions of the brain and to suggest prospects provided by the leading-edge techniques to study yet-unappreciated translational regulation in the nervous system.
Collapse
Affiliation(s)
- Han Kyoung Choe
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
- Correspondence: (H.K.C.); (J.C.)
| | - Jun Cho
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
- Correspondence: (H.K.C.); (J.C.)
| |
Collapse
|
34
|
Ju X, Ryu MJ, Cui J, Lee Y, Park S, Hong B, Yoo S, Lee WH, Shin YS, Yoon SH, Kweon GR, Kim YH, Ko Y, Heo JY, Chung W. The mTOR Inhibitor Rapamycin Prevents General Anesthesia-Induced Changes in Synaptic Transmission and Mitochondrial Respiration in Late Postnatal Mice. Front Cell Neurosci 2020; 14:4. [PMID: 32047423 PMCID: PMC6997293 DOI: 10.3389/fncel.2020.00004] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 01/09/2020] [Indexed: 12/20/2022] Open
Abstract
Preclinical animal studies have continuously reported the possibility of long-lasting neurotoxic effects after general anesthesia in young animals. Such studies also show that the neurological changes induced by anesthesia in young animals differ by their neurodevelopmental stage. Exposure to anesthetic agents increase dendritic spines and induce sex-dependent changes of excitatory/inhibitory synaptic transmission in late postnatal mice, a critical synaptogenic period. However, the mechanisms underlying these changes remain unclear. Abnormal activation of the mammalian target of rapamycin (mTOR) signaling pathway, an important regulator of neurodevelopment, has also been shown to induce similar changes during neurodevelopment. Interestingly, previous studies show that exposure to general anesthetics during neurodevelopment can activate the mTOR signaling pathway. This study, therefore, evaluated the role of mTOR signaling after exposing postnatal day (PND) 16/17 mice to sevoflurane, a widely used inhalation agent in pediatric patients. We first confirmed that a 2-h exposure of 2.5% sevoflurane could induce widespread mTOR phosphorylation in both male and female mice. Pretreatment with the mTOR inhibitor rapamycin not only prevented anesthesia-induced mTOR phosphorylation, but also the increase in mitochondrial respiration and male-dependent enhancement of excitatory synaptic transmission. However, the changes in inhibitory synaptic transmission that appear after anesthesia in female mice were not affected by rapamycin pretreatment. Our results suggest that mTOR inhibitors may act as potential therapeutic agents for anesthesia-induced changes in the developing brain.
Collapse
Affiliation(s)
- Xianshu Ju
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea.,Infection Control Convergence Research Center, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Min Jeong Ryu
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Jianchen Cui
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea.,Infection Control Convergence Research Center, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Yulim Lee
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea.,Infection Control Convergence Research Center, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Sangil Park
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea
| | - Boohwi Hong
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Sungho Yoo
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea
| | - Won Hyung Lee
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Yong Sup Shin
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Seok-Hwa Yoon
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Gi Ryang Kweon
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Yoon Hee Kim
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Youngkwon Ko
- Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Jun Young Heo
- Department of Biochemistry, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea.,Infection Control Convergence Research Center, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Woosuk Chung
- Department of Medical Science, Chungnam National University School of Medicine, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon, South Korea.,Department of Anesthesia and Pain Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| |
Collapse
|
35
|
Nakai H, Tsumagari R, Maruo K, Nakashima A, Kikkawa U, Ueda S, Yamanoue M, Saito N, Takei N, Shirai Y. mTORC1 is involved in DGKβ-induced neurite outgrowth and spinogenesis. Neurochem Int 2019; 134:104645. [PMID: 31891737 DOI: 10.1016/j.neuint.2019.104645] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 11/30/2019] [Accepted: 12/12/2019] [Indexed: 02/08/2023]
Abstract
Diacylglycerol kinase β (DGKβ) is an enzyme converting DG to phosphatidic acid (PA) and is specifically expressed in neurons, especially those in the cerebral cortex, hippocampus and striatum. We previously reported that DGKβ induces neurite outgrowth and spinogenesis, contributing to higher brain function including emotion and memory, and plasma membrane localization of DGKβ via the C1 domain and a cluster of basic amino acids at the C-terminus is necessary for its function. To clarify the mechanisms involved in neuronal development by DGKβ, we investigated whether DGKβ activity induces neurite outgrowth using human neuroblastoma SH-SY5Y cells. DGKβ induced neurite outgrowth by activation of mammalian target of rapamycin complex 1 (mTORC1) through a kinase-dependent pathway. In addition, in primary cultured cortical and hippocampal neurons, inhibition of mTORC1 abolished DGKβ induced-neurite outgrowth, branching and spinogenesis. These results indicated that DGKβ induces neurite outgrowth and spinogenesis by activating mTORC1 in a kinase-dependent pathway.
Collapse
Affiliation(s)
- Hiroko Nakai
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| | - Ryosuke Tsumagari
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| | - Kenta Maruo
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| | - Akio Nakashima
- Laboratory of Cell Signaling, Biosignal Research Center, Kobe University, Kobe, Japan.
| | - Ushio Kikkawa
- Laboratory of Cell Signaling, Biosignal Research Center, Kobe University, Kobe, Japan.
| | - Shuji Ueda
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| | - Minoru Yamanoue
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| | - Naoaki Saito
- Laboratory of Molecular Pharmacology, Biosignal Research Center, Kobe University, Kobe, Japan
| | - Nobuyuki Takei
- Department of Molecular Neurobiology, Brain Research Institute, Niigata University, Niigata, Japan.
| | - Yasuhito Shirai
- Department of Applied Chemistry in Bioscience, Graduate School of Agricultural Sciences & Faculty of Agriculture, Kobe University, Kobe, Japan.
| |
Collapse
|
36
|
Wang H, Huang B, Wang W, Li J, Chen Y, Flynn T, Zhao M, Zhou Z, Lin X, Zhang Y, Xu M, Li K, Tian K, Yuan D, Zhou P, Hu L, Zhong D, Zhu S, Li J, Chen D, Wang K, Liang J, He Q, Sun J, Shi J, Yan L, Sands JM, Xie Z, Lian X, Xu D, Ran J, Yang B. High urea induces depression and LTP impairment through mTOR signalling suppression caused by carbamylation. EBioMedicine 2019; 48:478-490. [PMID: 31628020 PMCID: PMC6838447 DOI: 10.1016/j.ebiom.2019.09.049] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 09/17/2019] [Accepted: 09/17/2019] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Urea, the end product of protein metabolism, has been considered to have negligible toxicity for a long time. Our previous study showed a depression phenotype in urea transporter (UT) B knockout mice, which suggests that abnormal urea metabolism may cause depression. The purpose of this study was to determine if urea accumulation in brain is a key factor causing depression using clinical data and animal models. METHODS A meta-analysis was used to identify the relationship between depression and chronic diseases. Functional Magnetic Resonance Imaging (fMRI) brain scans and common biochemical indexes were compared between the patients and healthy controls. We used behavioural tests, electrophysiology, and molecular profiling techniques to investigate the functional role and molecular basis in mouse models. FINDINGS After performing a meta-analysis, we targeted the relevance between chronic kidney disease (CKD) and depression. In a CKD mouse model and a patient cohort, depression was induced by impairing the medial prefrontal cortex. The enlarged cohort suggested that urea was responsible for depression. In mice, urea was sufficient to induce depression, interrupt long-term potentiation (LTP) and cause loss of synapses in several models. The mTORC1-S6K pathway inhibition was necessary for the effect of urea. Lastly, we identified that the hydrolysate of urea, cyanate, was also involved in this pathophysiology. INTERPRETATION These data indicate that urea accumulation in brain is an independent factor causing depression, bypassing the psychosocial stress. Urea or cyanate carbamylates mTOR to inhibit the mTORC1-S6K dependent dendritic protein synthesis, inducing impairment of synaptic plasticity in mPFC and depression-like behaviour. CKD patients may be able to attenuate depression only by strict management of blood urea.
Collapse
Affiliation(s)
- Hongkai Wang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China; Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Boyue Huang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Weiling Wang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Jinfang Li
- Department of Neurology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yi Chen
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Trevor Flynn
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Meng Zhao
- Department of Neurology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhiming Zhou
- Department of Radiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaojing Lin
- School of Public Health and Management, Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, Chongqing Medical University, Chongqing, China
| | - Yinan Zhang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China; National Institute on Drug Dependence, Peking University, Bejing, China
| | - Mengmeng Xu
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Keqiong Li
- Chongqing Cancer Research Institute, Chongqing, China
| | - Kuan Tian
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Dezhi Yuan
- Department of Neurology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Peng Zhou
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Ling Hu
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Dandan Zhong
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Shuai Zhu
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Jing Li
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Dilong Chen
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China; Chongqing Three Gorges Medical College, Chongqing, China
| | - Kejian Wang
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China
| | - Jianhui Liang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China; National Institute on Drug Dependence, Peking University, Bejing, China
| | - Qihua He
- Center of Medical and Health Analysis, Peking University, Beijing, China
| | - Jianbin Sun
- Clinical Laboratory, Peking University Third Hospital, Beijing, China
| | - Jie Shi
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China; National Institute on Drug Dependence, Peking University, Bejing, China
| | - Li Yan
- Ion Channel Explorer Bioscience INC., Beijing, China
| | - Jeff M Sands
- Renal Division, Department of Medicine and Department of Physiology, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Zhengwei Xie
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Xuemei Lian
- School of Public Health and Management, Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, Chongqing Medical University, Chongqing, China
| | - Duan Xu
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA
| | - Jianhua Ran
- Department of Anatomy, and Laboratory of Neuroscience and Tissue Engineering, Basic Medical College, Chongqing Medical University, Chongqing, China.
| | - Baoxue Yang
- Department of Pharmacology, School of Basic Medical Sciences, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China.
| |
Collapse
|
37
|
Rodríguez-Campuzano AG, Hernández-Kelly LC, Ortega A. Acute Exposure to SiO 2 Nanoparticles Affects Protein Synthesis in Bergmann Glia Cells. Neurotox Res 2019; 37:366-379. [PMID: 31292883 DOI: 10.1007/s12640-019-00084-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 06/04/2019] [Accepted: 06/26/2019] [Indexed: 10/26/2022]
Abstract
Attractive due to an alleged high biocompatibility, silica nanoparticles have been widely used in the field of nanomedicine; however, their proven capacity to induce the synthesis and release of pro-inflammatory cytokines in several cellular models has raised concern about their safety. Glutamate, the main excitatory amino acid transmitter triggers a wide variety of signal transduction cascades that regulate protein synthesis at transcriptional and translational levels. A stimulus-dependent dynamic change in the protein repertoire in neurons and glia cells is the molecular framework of higher brain functions. Within the cerebellum, Bergmann glia cells are the most abundant non-neuronal cells and span the entire molecular layer of the cerebellar cortex, wrapping the synapses in this structure. Taking into consideration the functional role of Bergmann glia in terms of the recycling of glutamate, lactate supply to neurons, and prevention of neurotoxic insults, we decided to investigate the possibility that silica nanoparticles affect Bergmann glia and by these means alter the major excitatory neurotransmitter system in the brain. To this end, we exposed cultured chick cerebellar Bergmann glia cells to silica nanoparticles and measured [35S]-methionine incorporation into newly synthesized polypeptides. Our results demonstrate that exposure of the cultured cells to silica nanoparticles exerts a time- and dose-dependent modulation of protein synthesis. Furthermore, altered patterns of eukaryotic initiation factor 2 alpha and eukaryotic elongation factor 2 phosphorylation were present upon nanoparticle exposure. These results demonstrate that glia cells respond to the presence of this nanomaterial modifying their proteome, presumably in an effort to overcome any plausible neurotoxic effect.
Collapse
Affiliation(s)
- Ada G Rodríguez-Campuzano
- Laboratorio de Neurotoxicología, Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Apartado Postal 14-740, 07000, Mexico City, Mexico
| | - Luisa C Hernández-Kelly
- Laboratorio de Neurotoxicología, Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Apartado Postal 14-740, 07000, Mexico City, Mexico
| | - Arturo Ortega
- Laboratorio de Neurotoxicología, Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, Apartado Postal 14-740, 07000, Mexico City, Mexico.
| |
Collapse
|
38
|
Jing D, Li D, Peng C, Chen Y, Behnisch T. Role of microtubules in late-associative plasticity of hippocampal Schaffer collateral-CA1 synapses in mice. Neurobiol Learn Mem 2019; 163:107038. [PMID: 31278986 DOI: 10.1016/j.nlm.2019.107038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 04/13/2019] [Accepted: 07/02/2019] [Indexed: 11/17/2022]
Abstract
The microtubule network represents a key scaffolding structure that forms part of the neuronal cytoskeleton and contributes to biomolecule exchange within neurons. However, researchers have not determined whether an intact microtubule network is required for late associative plasticity. Therefore, the late associative plasticity of field excitatory postsynaptic potentials from two synaptic inputs was analyzed. Synaptic potentiation was induced through alternating tetanization of hippocampal Schaffer-collateral CA1 synaptic populations in acute slices prepared from young-adult C57BL/6 mice. Vincristine was applied to depolymerize microtubules. Vincristine did not alter the phosphorylation levels of plasticity-related pre- or postsynaptic proteins but reduced the level of a protein marker of the ER-Golgi intermediate compartment (ERGIC-53/p58). Vincristine did not alter the magnitude or maintenance of the synaptic potentiation evoked by repeated tetanization (3 × 100 stimuli at 100 Hz) of one synaptic population. However, this synaptic potentiation was sensitive to the coapplication of a protein synthesis inhibitor, such as rapamycin, anisomycin or cycloheximide, indicating that protein synthesis has become essential in depolymerized microtubules during the first hour of the synaptic potentiation. The application of vincristine up to a 70 stimuli, 100 Hz tetanization of a second synaptic input prevented the transformation of short-term potentiation into long-term potentiation (LTP), further indicating that intact microtubules are required for the late associative properties of synaptic plasticity. Therefore, activity-dependent synaptic plasticity does not rely on microtubules within the first two hours after tetanization; however, the associative interaction of independent synaptic inputs relies on their proper function. In addition, either new protein synthesis or microtubule-based processes are sufficient to stabilize LTP within the first 3 h after tetanization, and a deficit in synaptic plasticity is only observable when both processes are blocked.
Collapse
Affiliation(s)
- Dongqing Jing
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
| | - Dongxue Li
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
| | - Cheng Peng
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
| | - Ying Chen
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
| | - Thomas Behnisch
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China.
| |
Collapse
|
39
|
Fahim A, Rehman Z, Bhatti MF, Virk N, Ali A, Rashid A, Paracha RZ. The Route to 'Chemobrain' - Computational probing of neuronal LTP pathway. Sci Rep 2019; 9:9630. [PMID: 31270411 PMCID: PMC6610097 DOI: 10.1038/s41598-019-45883-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 06/19/2019] [Indexed: 02/08/2023] Open
Abstract
Chemotherapy causes deleterious side effects during the course of cancer management. The toxic effects may be extended to CNS chronically resulting in altered cognitive function like learning and memory. The present study follows a computational assessment of 64 chemotherapeutic drugs for their off-target interactions against the major proteins involved in neuronal long term potentiation pathway. The cancer chemo-drugs were subjected to induced fit docking followed by scoring alignment and drug-targets interaction analysis. The results were further probed by electrostatic potential computation and ligand binding affinity prediction of the top complexes. The study identified novel off-target interactions by Dactinomycin, Temsirolimus, and Everolimus against NMDA, AMPA, PKA and ERK2, while Irinotecan, Bromocriptine and Dasatinib were top interacting drugs for CaMKII. This study presents with basic foundational knowledge regarding potential chemotherapeutic interference in LTP pathway which may modulate neurotransmission and synaptic plasticity in patient receiving these chemotherapies.
Collapse
Affiliation(s)
- Ammad Fahim
- Atta ur Rahman School of Applied Biosciences, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
| | - Zaira Rehman
- Atta ur Rahman School of Applied Biosciences, National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Muhammad Faraz Bhatti
- Atta ur Rahman School of Applied Biosciences, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
| | - Nasar Virk
- Atta ur Rahman School of Applied Biosciences, National University of Sciences and Technology (NUST), Islamabad, Pakistan
- EBS Universität für Wirtschaft und Recht, EBS Business School, Rheingaustrasse 1, Oestrich-Winkel, 65375, Germany
| | - Amjad Ali
- Atta ur Rahman School of Applied Biosciences, National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Amir Rashid
- Department of Biochemistry, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Rehan Zafar Paracha
- Research Centre for Modeling and Simulation, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
| |
Collapse
|
40
|
The effects of proteasome on baseline and methamphetamine-dependent dopamine transmission. Neurosci Biobehav Rev 2019; 102:308-317. [DOI: 10.1016/j.neubiorev.2019.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 04/29/2019] [Accepted: 05/09/2019] [Indexed: 12/16/2022]
|
41
|
Kou X, Chen D, Chen N. Physical Activity Alleviates Cognitive Dysfunction of Alzheimer's Disease through Regulating the mTOR Signaling Pathway. Int J Mol Sci 2019; 20:ijms20071591. [PMID: 30934958 PMCID: PMC6479697 DOI: 10.3390/ijms20071591] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/27/2019] [Accepted: 03/27/2019] [Indexed: 02/08/2023] Open
Abstract
Alzheimer's disease (AD) is one of the most common aging-related progressive neurodegenerative disorders, and can result in great suffering for a large portion of the aged population. Although the pathogenesis of AD is being elucidated, the exact mechanisms are still unclear, thereby impeding the development of effective drugs, supplements, and other interventional strategies for AD. In recent years, impaired autophagy associated with microRNA (miRNA) dysfunction has been reported to be involved in aging and aging-related neurodegenerative diseases. Therefore, miRNA-mediated regulation for the functional status of autophagy may become one of the potent interventional strategies for AD. Mounting evidence from in vivo AD models has demonstrated that physical activity can exert a neuroprotective role in AD. In addition, autophagy is strictly regulated by the mTOR signaling pathway. In this article, the regulation of the functional status of autophagy through the mTOR signaling pathway during physical activity is systematically discussed for the prevention and treatment of AD. This concept will be beneficial to developing novel and effective targets that can create a direct link between pharmacological intervention and AD in the future.
Collapse
Affiliation(s)
- Xianjuan Kou
- Tianjiu Research and Development Center for Exercise Nutrition and Foods, Hubei Key Laboratory of Exercise Training and Monitoring, College of Health Science, Wuhan Sports University, Wuhan 430079, China.
| | - Dandan Chen
- Graduate School, Wuhan Sports University, Wuhan 430079, China.
| | - Ning Chen
- Tianjiu Research and Development Center for Exercise Nutrition and Foods, Hubei Key Laboratory of Exercise Training and Monitoring, College of Health Science, Wuhan Sports University, Wuhan 430079, China.
| |
Collapse
|
42
|
Zhang J, Lin Y, Dai X, Fang W, Wu X, Chen X. Metformin treatment improves the spatial memory of aged mice in an APOE genotype-dependent manner. FASEB J 2019; 33:7748-7757. [PMID: 30894020 DOI: 10.1096/fj.201802718r] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Aging and apolipoprotein E4 (ApoE4) can increase the risk of cognitive impairment and neurodegenerative disorders, including Alzheimer's disease (AD), and patients with type 2 diabetes mellitus are highly susceptible to cognitive dysfunction. Recent research has indicated that metformin, a prescribed drug for type 2 diabetes, may affect cognitive function; however, findings regarding its efficacy are largely controversial. The current study reported that a 5-mo metformin administration (300 mg/kg/d) starting at 13 mo old improved the spatial memory of ApoE3-target replacement (TR) mice, not ApoE4-TR mice. It found that in aged ApoE3-TR mice, metformin treatment, at a molecular level, inhibited AMPK activity, increased insulin signaling, and activated mammalian target of rapamycin signaling, resulting in an enhanced expression of postsynaptic proteins; but the response of the neuronal AMPK activity and insulin signaling to metformin was blunt in aged ApoE4-TR mice. Meanwhile, metformin treatment also increased the phosphorylation of tau in both ApoE3-TR and ApoE4-TR mice, implying that metformin may have side effects in human. These findings suggest that metformin can improve the cognitive performance of aged mice in an APOE genotype-dependent manner, which provides empirical insights into the clinical value of metformin for ApoE4- and age-related AD prevention and treatment.-Zhang, J., Lin, Y., Dai, X., Fang, W., Wu, X., Chen, X. Metformin treatment improves the spatial memory of aged mice in an APOE genotype-dependent manner.
Collapse
Affiliation(s)
- Jing Zhang
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China.,Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Yingbin Lin
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoman Dai
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China.,Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Wenting Fang
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xilin Wu
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaochun Chen
- Department of Neurology and Geriatrics, Fujian Institute of Geriatrics, Fujian Medical University Union Hospital, Fuzhou, China.,Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| |
Collapse
|
43
|
Zhang T, Shi Z, Wang Y, Wang L, Zhang B, Chen G, Wan Q, Chen L. Akt3 deletion in mice impairs spatial cognition and hippocampal CA1 long long-term potentiation through downregulation of mTOR. Acta Physiol (Oxf) 2019; 225:e13167. [PMID: 30053339 DOI: 10.1111/apha.13167] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Revised: 07/20/2018] [Accepted: 07/24/2018] [Indexed: 11/30/2022]
Abstract
AIM Loss-of-function mutation of Akt3 in humans has been associated with microcephaly and cognitive defects. Two Akt isoforms, Akt1 and Akt3, are highly expressed in hippocampal pyramidal cells. We explored the roles of Akt1 and Akt3, respectively, in spatial cognition and underlying mechanisms. METHODS We used Akt1 knockout (Akt1-KO) and Akt3 knockout (Akt3-KO) mice to examine the influence of Akt1 and Akt3 deficiency on spatial memory, as well as induction and maintenance of hippocampal CA1 NMDA receptor-dependent and protein synthesis-dependent long-term potentiation (LTP). RESULTS Long-term spatial memory was impaired in Akt3-KO mice, but not in Akt1-KO mice, as assessed by the Morris water maze task. Akt3-KO and Akt1-KO mice displayed reductions in brain size without concurrent changes in the number of pyramidal cells or basal properties of synaptic transmission. One-train high-frequency stimulation (HFS × 1) induced NMDA receptor-dependent LTP in Akt3-KO mice and Akt1-KO mice. Four-train HFS (HFS × 4) induced rapamycin-sensitive long-LTP in Akt1-KO mice, but not Akt3-KO mice. Basal level of mTOR phosphorylation was reduced in Akt3-KO mice rather than Akt1-KO mice. HFS × 4 induced an elevation of mTOR and p70S6K phosphorylation in Akt1-KO mice, which led to enhanced 4EBP2 and eIF4E phosphorylation along with an increase in AMPA receptor protein. However, the same protocol of HFS × 4 failed to trigger the mTOR-p70S6K signalling cascade or increase 4EBP2 and eIF4E phosphorylation in Akt3-KO mice. CONCLUSION The Akt3 deficiency via inactivation of mTOR suppresses HFS × 4-induced mTOR-p70S6K signalling to reduce phosphorylation of 4EBP and eIF4E, which impairs protein synthesis-dependent long-LTP and long-term spatial cognitive function.
Collapse
Affiliation(s)
- Tingting Zhang
- State Key Lab of Reproductive Medicine; Nanjing Medical University; Nanjing China
- Department of Physiology; Nanjing Medical University; Nanjing China
| | - Zhaochun Shi
- Department of Neurology; First Affiliated Hospital of Nanjing Medical University; Nanjing China
| | - Ya Wang
- Department of Physiology; Nanjing Medical University; Nanjing China
| | - Ling Wang
- Department of Physiology; Nanjing Medical University; Nanjing China
| | - Baofeng Zhang
- Department of Physiology; Nanjing Medical University; Nanjing China
| | - Guiquan Chen
- State Key Laboratory of Pharmaceutical Biotechnology; MOE Key Laboratory of Model Animal for Disease Study; Model Animal Research Center; Nanjing University; Nanjing China
| | - Qi Wan
- Department of Neurology; First Affiliated Hospital of Nanjing Medical University; Nanjing China
| | - Ling Chen
- State Key Lab of Reproductive Medicine; Nanjing Medical University; Nanjing China
- Department of Physiology; Nanjing Medical University; Nanjing China
| |
Collapse
|
44
|
Liang H, Nie J, Van Skike CE, Valentine JM, Orr ME. Mammalian Target of Rapamycin at the Crossroad Between Alzheimer's Disease and Diabetes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1128:185-225. [PMID: 31062331 DOI: 10.1007/978-981-13-3540-2_10] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Accumulating evidence suggests that Alzheimer's disease may manifest as a metabolic disorder with pathology and/or dysfunction in numerous tissues. Adults with Alzheimer's disease suffer with significantly more comorbidities than demographically matched Medicare beneficiaries (Zhao et al, BMC Health Serv Res 8:108, 2008b). Reciprocally, comorbid health conditions increase the risk of developing Alzheimer's disease (Haaksma et al, PLoS One 12(5):e0177044, 2017). Type 2 diabetes mellitus is especially notable as the disease shares many overlapping pathologies observed in patients with Alzheimer's disease, including hyperglycemia, hyperinsulinemia, insulin resistance, glucose intolerance, dyslipidemia, inflammation, and cognitive dysfunction, as described in Chap. 8 of this book (Yoshitake et al, Neurology 45(6):1161-1168, 1995; Leibson et al, Am J Epidemiol 145(4):301-308, 1997; Ott et al, Neurology 53(9):1937-1942, 1999; Voisin et al, Rev Med Interne 24(Suppl 3):288s-291s, 2003; Janson et al. Diabetes 53(2):474-481, 2004; Ristow M, J Mol Med (Berl) 82(8):510-529, 2004; Whitmer et al, BMJ 330(7504):1360, 2005, Curr Alzheimer Res 4(2):103-109, 2007; Ohara et al, Neurology 77(12):1126-1134, 2011). Although nondiabetic older adults also experience age-related cognitive decline, diabetes is uniquely associated with a twofold increased risk of Alzheimer's disease, as described in Chap. 2 of this book (Yoshitake et al, Neurology 45(6):1161-1168, 1995; Leibson et al, Am J Epidemiol 145(4):301-308, 1997; Ott et al. Neurology 53(9):1937-1942, 1999; Ohara et al, Neurology 77(12):1126-1134, 2011). Good glycemic control has been shown to improve cognitive status (Cukierman-et al, Diabetes Care 32(2):221-226, 2009), and the use of insulin sensitizers is correlated with a lower rate of cognitive decline in older adults (Morris JK, Burns JM, Curr Neurol Neurosci Rep 12(5):520-527, 2012). At the molecular level, the mechanistic/mammalian target of rapamycin (mTOR) plays a key role in maintaining energy homeostasis. Nutrient availability and cellular stress information, both extracellular and intracellular, are integrated and transduced through mTOR signaling pathways. Aberrant regulation of mTOR occurs in the brains of patients with Alzheimer's disease and in numerous tissues of individuals with type 2 diabetes (Mannaa et al, J Mol Med (Berl) 91(10):1167-1175, 2013). Moreover, modulating mTOR activity with a pharmacological inhibitor, rapamycin, provides wide-ranging health benefits, including healthy life span extension in numerous model organisms (Vellai et al, Nature 426(6967):620, 2003; Jia et al, Development 131(16):3897-3906, 2004; Kapahi et al, Curr Biol 14(10):885-890, 2004; Kaeberlein et al, Science 310(5751):1193-1196, 2005; Powers et al, Genes Dev 20(2):174-184, 2006; Harrison et al, Nature 460(7253):392-395, 2009; Selman et al, Science 326(5949):140-144, 2009; Sharp ZD, Strong R, J Gerontol A Biol Sci Med Sci 65(6):580-589, 2010), which underscores its importance to overall organismal health and longevity. In this chapter, we discuss the physiological role of mTOR signaling and the consequences of mTOR dysregulation in the brain and peripheral tissues, with emphasis on its relevance to the development of Alzheimer's disease and link to type 2 diabetes.
Collapse
Affiliation(s)
- Hanyu Liang
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
- Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Jia Nie
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Candice E Van Skike
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Joseph M Valentine
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Miranda E Orr
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
- Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
- San Antonio Geriatric Research, Education and Clinical Center, South Texas Veterans Health Care System, San Antonio, TX, USA.
- Glenn Biggs Institute for Alzheimer's & Neurodegenerative Diseases, San Antonio, TX, USA.
| |
Collapse
|
45
|
Um SW, Kim MJ, Leem JW, Bai SJ, Lee BH. Pain-Relieving Effects of mTOR Inhibitor in the Anterior Cingulate Cortex of Neuropathic Rats. Mol Neurobiol 2018; 56:2482-2494. [PMID: 30032425 PMCID: PMC6459802 DOI: 10.1007/s12035-018-1245-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 07/15/2018] [Indexed: 01/22/2023]
Abstract
The anterior cingulate cortex (ACC) is a well-known brain area that is associated with pain perception. Previous studies reported that the ACC has a specific role in the emotional processing of pain. Chronic pain is characterized by long-term potentiation that is induced in pain pathways and contributes to hyperalgesia caused by peripheral nerve injury. The mammalian target of rapamycin (mTOR) signaling, which is involved in synaptic protein synthesis, could be a key factor controlling long-term potentiation in neuropathic pain conditions. Until now, there have been no reports that studied the role of mTOR signaling in the ACC involved in neuropathic pain. Therefore, this study was conducted to determine the relationship of mTOR signaling in the ACC and neuropathic pain. Male Sprague-Dawley rats were subjected to cannula implantation and nerve injury under pentobarbital anesthesia. Microinjection with rapamycin into the ACC was conducted under isoflurane anesthesia on postoperative day (POD) 7. A behavioral test was performed to evaluate mechanical allodynia, and optical imaging was conducted to observe the neuronal responses of the ACC to peripheral stimulation. Inhibition of mTOR by rapamycin reduced mechanical allodynia, down-regulated mTOR signaling in the ACC, and diminished the expressions of synaptic proteins which are involved in excitatory signaling, thereby reducing neuropathic pain-induced synaptic plasticity. These results suggest that inhibiting mTOR activity by rapamycin in the ACC could serve as a new strategy for treating or managing neuropathic pain before it develops into chronic pain.
Collapse
Affiliation(s)
- Sun Woo Um
- Department of Physiology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Min Jee Kim
- Department of Physiology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Joong Woo Leem
- Department of Physiology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Sun Joon Bai
- Department of Anesthesiology and Pain Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Bae Hwan Lee
- Department of Physiology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea.
| |
Collapse
|
46
|
Gui Y, Chen L, Duan S, Li G, Tang J, Li A. Methyl cinnamate alleviated CCI-induced upregualtion of spinal AMPA receptors and pain hypersensitivity by targeting AMPK. Eur J Pharmacol 2018; 833:183-189. [PMID: 29802834 DOI: 10.1016/j.ejphar.2018.05.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 05/20/2018] [Accepted: 05/22/2018] [Indexed: 12/22/2022]
Abstract
Various studies proved spinal AMPA receptors were involved in the formation of neuropathic pain. In this study, we investigated the effect of methyl cinnamate (MC), a flavoring agent widely used in food and commodity industry, on CCI-induced upregulation of spinal AMPARs and pain hypersensitive behaviors. Results indicated that MC treatment dosage-dependently inhibited CCI-induced mechanical and thermal hypersensitivity. To further investigate the effect of MC after the formation of neuropathic pain, MC at the dosage of 100 mg/kg was administrated on day 7-14 on CCI rats. Results showed that MC treatment for seven days alleviated CCI-induced pain hypersensitivity after the formation of neuropathic pain. MC treatment reversed CCI-induced upregulation of GluR2, GluR3 and phosphorylation of GluR1. Further, MC dosage-dependently alleviated CCI-induced activation of mTOR and the downstream p70s6k. MC dosage-dependently induced activation of AMPK. All the MC-induced effects in CCI rats were completely reversed by Compound C, a AMPK inhibitor. These results meant MC treatment mitigated CCI-induced upregualtion of spinal AMPA receptors and pain hypersensitive behaviors through actviation of AMPK.
Collapse
Affiliation(s)
- Yulong Gui
- Department of Anesthesiology, Hunan Provincial Maternal and Child Health Hospital, Changsha 410000, Hunan Province, China
| | - Liang Chen
- Department of Anesthesiology, Hunan Provincial Maternal and Child Health Hospital, Changsha 410000, Hunan Province, China
| | - Shunyuan Duan
- Department of Endocrinology, Yongzhou-affiliated Hospital of University of South China, Yongzhou 425000, Hunan Province, China
| | - Guan Li
- Department of Anesthesiology, Hunan Provincial Maternal and Child Health Hospital, Changsha 410000, Hunan Province, China
| | - Jing Tang
- Department of Anesthesiology, Hunan Provincial Maternal and Child Health Hospital, Changsha 410000, Hunan Province, China
| | - Aiyuan Li
- Department of Anesthesiology, Hunan Provincial Maternal and Child Health Hospital, Changsha 410000, Hunan Province, China.
| |
Collapse
|
47
|
Ahmadiantehrani S, Gores EO, London SE. A complex mTOR response in habituation paradigms for a social signal in adult songbirds. ACTA ACUST UNITED AC 2018; 25:273-282. [PMID: 29764973 PMCID: PMC5959225 DOI: 10.1101/lm.046417.117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 03/19/2018] [Indexed: 01/27/2023]
Abstract
Nonassociative learning is considered simple because it depends on presentation of a single stimulus, but it likely reflects complex molecular signaling. To advance understanding of the molecular mechanisms of one form of nonassociative learning, habituation, for ethologically relevant signals we examined song recognition learning in adult zebra finches. These colonial songbirds learn the unique song of individuals, which helps establish and maintain mate and other social bonds, and informs appropriate behavioral interactions with specific birds. We leveraged prior work demonstrating behavioral habituation for individual songs, and extended the molecular framework correlated with this behavior by investigating the mechanistic Target of Rapamycin (mTOR) signaling cascade. We hypothesized that mTOR may contribute to habituation because it integrates a variety of upstream signals and enhances associative learning, and it crosstalks with another cascade previously associated with habituation, ERK/ZENK. To begin probing for a possible role for mTOR in song recognition learning, we used a combination of song playback paradigms and bidirectional dysregulation of mTORC1 activation. We found that mTOR demonstrates the molecular signatures of a habituation mechanism, and that its manipulation reveals the complexity of processes that may be invoked during nonassociative learning. These results thus expand the molecular targets for habituation studies and raise new questions about neural processing of complex natural signals.
Collapse
Affiliation(s)
- Somayeh Ahmadiantehrani
- Department of Psychology, Institute for Mind and Biology, Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, University of Chicago, Chicago, Illinois 60637, USA
| | - Elisa O Gores
- Department of Psychology, Institute for Mind and Biology, Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, University of Chicago, Chicago, Illinois 60637, USA
| | - Sarah E London
- Department of Psychology, Institute for Mind and Biology, Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, University of Chicago, Chicago, Illinois 60637, USA
| |
Collapse
|
48
|
Tansley SN, Wong C, Uttam S, Mogil JS, Khoutorsky A. Translation regulation in the spinal dorsal horn - A key mechanism for development of chronic pain. NEUROBIOLOGY OF PAIN 2018; 4:20-26. [PMID: 30906901 PMCID: PMC6428080 DOI: 10.1016/j.ynpai.2018.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Spinal sensitization shares molecular mechanisms with hippocampal LTP and memory. Changes in mRNA translation are observed in many chronic pain conditions. Targeting translational control mechanisms is a promising strategy to inhibit pain. Targeting spinal reconsolidation can reverse established hypersensitivity.
Chronic pain is a pathological condition characterized by long-lasting pain after damaged tissue has healed. Chronic pain can be caused and maintained by changes in various components of the pain pathway, including sensory neurons, spinal cord and higher brain centers. Exaggerated sensitivity and responsiveness of spinal nociceptive circuits, representing maladaptive plasticity, play key roles in the amplification of peripheral signals in chronic pain conditions. This spinal amplification mechanism profoundly contributes to the development and maintenance of chronic pain hypersensitivity in response to peripheral injury, and in some cases occurs independently of the peripheral stimulus. Long-lasting changes in the activity of spinal neurons are caused by alterations in their cellular proteome, which relies on de novo gene expression. Recent evidence indicates that translational control of gene expression plays a major role in determining protein levels, and is intricately involved in different forms of intrinsic and synaptic plasticity. In this review, we summarize findings supporting a key role for translational control in spinal cord-dependent mechanisms of chronic pain, and present recent approaches to reverse persistent pain by targeting these mechanisms.
Collapse
Affiliation(s)
- Shannon N Tansley
- Department of Anesthesia, McGill University, Montréal, QC H3A 0G1, Canada.,Department of Psychology, McGill University, Montréal, QC H3A 1B1, Canada
| | - Calvin Wong
- Department of Anesthesia, McGill University, Montréal, QC H3A 0G1, Canada
| | - Sonali Uttam
- Department of Anesthesia, McGill University, Montréal, QC H3A 0G1, Canada
| | - Jeffrey S Mogil
- Department of Anesthesia, McGill University, Montréal, QC H3A 0G1, Canada.,Department of Psychology, McGill University, Montréal, QC H3A 1B1, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, QC H3A 0G1, Canada
| | - Arkady Khoutorsky
- Department of Anesthesia, McGill University, Montréal, QC H3A 0G1, Canada.,Alan Edwards Centre for Research on Pain, McGill University, Montréal, QC H3A 0G1, Canada
| |
Collapse
|
49
|
Talos DM, Jacobs LM, Gourmaud S, Coto CA, Sun H, Lim KC, Lucas TH, Davis KA, Martinez-Lage M, Jensen FE. Mechanistic target of rapamycin complex 1 and 2 in human temporal lobe epilepsy. Ann Neurol 2018; 83:311-327. [PMID: 29331082 DOI: 10.1002/ana.25149] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 01/09/2018] [Accepted: 01/10/2018] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Temporal lobe epilepsy (TLE) is a chronic epilepsy syndrome defined by seizures and progressive neurological disabilities, including cognitive impairments, anxiety, and depression. Here, human TLE specimens were investigated focusing on the mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) and complex 2 (mTORC2) activities in the brain, given that both pathways may represent unique targets for treatment. METHODS Surgically resected hippocampal and temporal lobe samples from therapy-resistant TLE patients were analyzed by western blotting to quantify the expression of established mTORC1 and mTORC2 activity markers and upstream or downstream signaling pathways involving the two complexes. Histological and immunohistochemical techniques were used to assess hippocampal and neocortical structural abnormalities and cell-specific expression of individual biomarkers. Samples from patients with focal cortical dysplasia (FCD) type II served as positive controls. RESULTS We found significantly increased expression of phospho-mTOR (Ser2448), phospho-S6 (Ser235/236), phospho-S6 (Ser240/244), and phospho-Akt (Ser473) in TLE samples compared to controls, consistent with activation of both mTORC1 and mTORC2. Our work identified the phosphoinositide 3-kinase and Ras/extracellular signal-regulated kinase signaling pathways as potential mTORC1 and mTORC2 upstream activators. In addition, we found that overactive mTORC2 signaling was accompanied by induction of two protein kinase B-dependent prosurvival pathways, as evidenced by increased inhibitory phosphorylation of forkhead box class O3a (Ser253) and glycogen synthase kinase 3 beta (Ser9). INTERPRETATION Our data demonstrate that mTOR signaling is significantly dysregulated in human TLE, offering new targets for pharmacological interventions. Specifically, clinically available drugs that suppress mTORC1 without compromising mTOR2 signaling, such as rapamycin and its analogs, may represent a new group of antiepileptogenic agents in TLE patients. Ann Neurol 2018;83:311-327.
Collapse
Affiliation(s)
- Delia M Talos
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Leah M Jacobs
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Sarah Gourmaud
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Carlos A Coto
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Hongyu Sun
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA.,Department of Neuroscience, Carleton University, Ottawa, ON, Canada
| | - Kuei-Cheng Lim
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Timothy H Lucas
- Department of Neurosurgery, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Kathryn A Davis
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Maria Martinez-Lage
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| | - Frances E Jensen
- Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
| |
Collapse
|
50
|
Sokolov AM, Seluzicki CM, Morton MC, Feliciano DM. Dendrite growth and the effect of ectopic Rheb expression on cortical neurons. Neurosci Lett 2018; 671:140-147. [PMID: 29447953 DOI: 10.1016/j.neulet.2018.02.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/07/2018] [Accepted: 02/09/2018] [Indexed: 11/26/2022]
Abstract
Ras homology enriched in brain (Rheb) is a GTPase that activates the protein kinase mammalian Target of Rapamycin (mTOR). Rheb mutations cause intellectual delay and megalencephaly. mTOR hyperactivation causes a constellation of neurodevelopmental disorders called "mTOR-opathies" that are frequently accompanied by hyperexcitable cortical malformations. Cortical malformations within the anterior cingulate cortex (ACC) and somatosensory cortex (SSC) frequently colocalize with hyperexcitability. Although Rheb and mTOR are implicated in the formation of cortical lesions, seizure activity, and defects in neuronal migration, the contribution of Rheb to changes in neuron size and dendrite morphology is not well established. Here, in utero electroporation of the developing embryonic brain was used to assess soma and dendrite growth in ACC and SCC layer II/III neurons. We found that between P0 and P21, neuronal soma size increased by 50 and 122 percent in the ACC and SSC, respectively. The increased size was accompanied by an increase in the number of basal dendrites and enhanced dendrite complexity. As an indicator of the involvement of the mTOR pathway in neuron maturation, phosphorylation of the mammalian target of rapamycin (mTOR) substrate S6 was identified in migrating cortical neuroblasts and maturing neurons. Notably, ectopic expression of Rheb caused cortical malformations comprised of ectopically positioned cytomegalic neurons with dendrite hypertrophy. This study provides a direct comparison of neuron maturation across two cortical regions during development, provides evidence for mTOR pathway activity during neuron maturation, and demonstrates that ectopic Rheb expression without mutation is sufficient to induce cortical malformations with cytomegaly and dendrite hypertrophy.
Collapse
Affiliation(s)
- Aidan M Sokolov
- Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314, USA.
| | - Caitlin M Seluzicki
- Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314, USA.
| | - Mary C Morton
- Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314, USA.
| | - David M Feliciano
- Department of Biological Sciences, Clemson University, Clemson, SC 29634-0314, USA.
| |
Collapse
|