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Lin W, Zhou Y, Liu Y, Liu C, Lin M, Tang Y, Chen A, Wu B, Lin C. Dorsoventral hippocampus distinctly modulates visceral sensitivity and anxiety behaviors in male IBS-like rats. J Neurosci Res 2024; 102. [PMID: 38284854 DOI: 10.1002/jnr.25289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 12/03/2023] [Accepted: 12/12/2023] [Indexed: 01/30/2024]
Abstract
Accumulating evidences suggest dysfunctions in the hippocampus are associated with chronic pain. Nevertheless, the role of hippocampal circuitry in pain memories and emotional responses is not yet fully understood. In this study, we utilized a comprehensive approach that combined electromyography (EMG), photochemical genetic techniques, and anxiety-related behavioral paradigms to investigate the involvement of dorsal hippocampus (DH) and ventral hippocampus (VH) in visceral sensitivity and anxiety behaviors in male rats. Our results demonstrated that IBS-like rats exhibited comorbid visceral hypersensitivity and anxiety, along with the number of activated neurons in the VH was higher than that in the DH. Manipulation of glutamatergic neurons in the hippocampus was identified as a crucial mechanism underlying the mediation of both visceral sensitivity and anxiety behaviors. Specifically, optogenetic activation of the DH induced both visceral hypersensitivity and anxiety, while activation of the VH induced anxiety but did not affect visceral sensitivity. Conversely, chemogenetic inhibition of the DH reduced both visceral hypersensitivity and anxiety, whereas inhibition of the VH alleviated anxiety but did not alleviate visceral hypersensitivity in IBS-like rats. Our study highlights the important role of early life stress in inducing visceral hypersensitivity and anxiety, and further elucidates the distinct functional contributions of the DH and VH to these behavioral changes. These findings provide a theoretical basis for the diagnosis and treatment of IBS, and suggest that targeting specific hippocampal neuron subtypes may represent a promising therapeutic approach.
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Affiliation(s)
- Wei Lin
- Department of Pediatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Yifei Zhou
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Yuan Liu
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
- Cancer Research Center Nantong, Affiliated Tumor Hospital of Nantong University, Nantong, China
| | - Congxu Liu
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Mengying Lin
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Ying Tang
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Aiqin Chen
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Bin Wu
- Department of Pediatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Chun Lin
- Department of Pediatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
- Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China
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Zhou Q, Lin L, Li H, Li Y, Liu N, Wang H, Jiang S, Li Q, Chen Z, Lin Y, Jin H, Deng Y. Intrahippocampal injection of IL-1β upregulates Siah1-mediated degradation of synaptophysin by activation of the ERK signaling in male rat. J Neurosci Res 2023; 101:930-951. [PMID: 36720002 DOI: 10.1002/jnr.25170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 12/21/2022] [Accepted: 01/13/2023] [Indexed: 02/02/2023]
Abstract
Interleukin-1β (IL-1β) has been described to exert important effect on synapses in the brain. Here, we explored if the synapses in the hippocampus would be adversely affected following intracerebral IL-1β injection and, if so, to clarify the underlying molecular mechanisms. Adult male Sprague-Dawley rats were divided into control, IL-1β, IL-1β + PD98059, and IL-1β + MG132 groups and then sacrificed for detection of synaptophysin (syn) protein level, synaptosome glutamate release, and synapse ultrastructure by western blotting, glutamate kit and electron microscopy, respectively. These rats were tested by Morris water maze for learning and memory ability. It was determined by western blotting whether IL-1β exerted the effect of on syn and siah1 expression in primary neurons via extracellular regulated protein kinases (ERK) signaling pathway. Intrahippocampal injection of IL-1β in male rats and sacrificed at 8d resulted in a significant decrease in syn protein, damage of synapse structure, and abnormal release of neurotransmitters glutamate. ERK inhibitor and proteosome inhibitor treatment reversed the above changes induced by IL-1β both in vivo and in vitro. In primary cultured neurons incubated with IL-1β, the expression level of synaptophysin was significantly downregulated coupled with abnormal glutamate release. Furthermore, use of PD98059 had confirmed that ERK signaling pathway was implicated in synaptic disorders caused by IL-1β treatment. The present results suggest that exogenous IL-1β can suppress syn protein level and glutamate release. A possible mechanism for this is that IL-1β induces syn degradation that is regulated by the E3 ligase siah1 via the ERK signaling pathway.
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Affiliation(s)
- Qiuping Zhou
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Lanfen Lin
- Guangdong Second Provincial General Hospital, Guangzhou, China
| | - Haiyan Li
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Yichen Li
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Nan Liu
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Huifang Wang
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Shuqi Jiang
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Qian Li
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China.,Southern Medical University, Guangzhou, China
| | - Zhuo Chen
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Yiyan Lin
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China.,Southern Medical University, Guangzhou, China
| | - Hui Jin
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Yiyu Deng
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
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3
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Bhardwaj A, Bhardwaj R, Sharma S, Sharma SK, Dhawan DK, Kaur T. AMPA induced cognitive impairment in rats: Establishing the role of endoplasmic reticulum stress inhibitor, 4-PBA. J Neurosci Res 2021; 99:2573-2591. [PMID: 34197000 DOI: 10.1002/jnr.24859] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 02/05/2020] [Accepted: 05/03/2021] [Indexed: 11/09/2022]
Abstract
Glutamate excitotoxicity and endoplasmic reticulum (ER) recently have been found to be instrumental in the pathogenesis of various neurodegenerative diseases. However, the paucity of literature deciphering the inter-linkage among glutamate receptors, behavioral alterations, and ER demands thorough exploration. Reckoning the aforesaid concerns, a prospective study was outlined to delineate the influence of ER stress inhibition via 4-phenylbutyric acid (PBA) on α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) excitotoxicity-induced behavioral aspects and possible ER stress-glutamate linkage. Male SD rats were randomly divided into four groups namely sham (surgical control+vehicle, group 1), AMPA-induced excitotoxic group 2 receive a single intra-hippocampal injection of 10 mM AMPA, group 3 received AMPA along with PBA (i.p, 100 mg/kg body weight) for 15 days, and group 4 received PBA alone. Behavioral analyses were performed prior to the sacrifice of animals and hippocampus was extracted thereafter for further analysis. AMPA-induced excitotoxicity exhibited significant impairment of locomotion as well as cognitive functions. The levels of neurotransmitters such as dopamine, homo vanillic acid (HVA), norepinephrine, and serotonin were reduced accompanied by reduced expression of GLUR1 and GLUR4 (glutamate receptor) as well as loss of neurons in different layers of hippocampus. ER stress markers were upregulated upon AMPA excitotoxicity. However, chemical chaperone PBA supplementation remarkably mitigated the behavioral alterations along with expression of glutamate and ER stress intermediates/markers in AMPA excitotoxic animals. Therefore, the present exploration convincingly emphasizes the significance of ER stress and its inhibition via PBA in combating cognitive impairment as well as improving locomotion in excitotoxic animals.
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Affiliation(s)
- Ankita Bhardwaj
- Department of Biophysics, Panjab University, Chandigarh, India
| | - Rishi Bhardwaj
- Department of Biophysics, Panjab University, Chandigarh, India
| | - Shweta Sharma
- Institute of Forensic Science and Criminology, Panjab University, Chandigarh, India
| | | | | | - Tanzeer Kaur
- Department of Biophysics, Panjab University, Chandigarh, India
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Kirk LM, Ti SW, Bishop HI, Orozco-Llamas M, Pham M, Trimmer JS, Díaz E. Distribution of the SynDIG4/proline-rich transmembrane protein 1 in rat brain. J Comp Neurol 2015; 524:2266-80. [PMID: 26660156 DOI: 10.1002/cne.23945] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 11/17/2015] [Accepted: 12/01/2015] [Indexed: 12/22/2022]
Abstract
The modulation of AMPA receptor (AMPAR) content at synapses is thought to be an underlying molecular mechanism of memory and learning. AMPAR content at synapses is highly plastic and is regulated by numerous AMPAR accessory transmembrane proteins such as TARPs, cornichons, and CKAMPs. SynDIG (synapse differentiation-induced gene) defines a family of four genes (SynDIG1-4) expressed in distinct and overlapping patterns in the brain. SynDIG1 was previously identified as a novel transmembrane AMPAR-associated protein that regulates synaptic strength. The related protein SynDIG4 [also known as Prrt1 (proline-rich transmembrane protein 1)] has recently been identified as a component of AMPAR complexes. In this study, we show that SynDIG1 and SynDIG4 have distinct yet overlapping patterns of expression in the central nervous system, with SynDIG4 having especially prominent expression in the hippocampus and particularly within CA1. In contrast to SynDIG1 and other traditional AMPAR auxiliary subunits, SynDIG4 is de-enriched at the postsynaptic density and colocalizes with extrasynaptic GluA1 puncta in primary dissociated neuron culture. These results indicate that, although SynDIG4 shares sequence similarity with SynDIG1, it might act through a unique mechanism as an auxiliary factor for extrasynaptic GluA1-containing AMPARs. J. Comp. Neurol. 524:2266-2280, 2016. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Lyndsey M Kirk
- Department of Pharmacology, University of California Davis School of Medicine, Davis, California, 95616
| | - Shu W Ti
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, California, 95616
| | - Hannah I Bishop
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, California, 95616
| | - Mayra Orozco-Llamas
- Department of Pharmacology, University of California Davis School of Medicine, Davis, California, 95616
| | - Michelle Pham
- Department of Pharmacology, University of California Davis School of Medicine, Davis, California, 95616
| | - James S Trimmer
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, California, 95616.,Department of Physiology and Membrane Biology, University of California Davis School of Medicine, Davis, California, 95616
| | - Elva Díaz
- Department of Pharmacology, University of California Davis School of Medicine, Davis, California, 95616
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5
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Cheng CF, Wang WC, Huang CY, Du PH, Yang JH, Tsaur ML. Coexpression of auxiliary subunits KChIP and DPPL in potassium channel Kv4-positive nociceptors and pain-modulating spinal interneurons. J Comp Neurol 2015; 524:846-73. [PMID: 26239200 DOI: 10.1002/cne.23876] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 07/30/2015] [Accepted: 07/31/2015] [Indexed: 12/21/2022]
Abstract
Subthreshold A-type K(+) currents (ISA s) have been recorded from the somata of nociceptors and spinal lamina II excitatory interneurons, which sense and modulate pain, respectively. Kv4 channels are responsible for the somatodendritic ISA s. Accumulative evidence suggests that neuronal Kv4 channels are ternary complexes including pore-forming Kv4 subunits and two types of auxiliary subunits: K(+) channel-interacting proteins (KChIPs) and dipeptidyl peptidase-like proteins (DPPLs). Previous reports have shown Kv4.3 in a subset of nonpeptidergic nociceptors and Kv4.2/Kv4.3 in certain spinal lamina II excitatory interneurons. However, whether and which KChIP and DPPL are coexpressed with Kv4 in these ISA -expressing pain-related neurons is unknown. In this study we mapped the protein distribution of KChIP1, KChIP2, KChIP3, DPP6, and DPP10 in adult rat dorsal root ganglion (DRG) and spinal cord by immunohistochemistry. In the DRG, we found colocalization of KChIP1, KChIP2, and DPP10 in the somatic surface and cytoplasm of Kv4.3(+) nociceptors. KChIP3 appears in most Aβ and Aδ sensory neurons as well as a small population of peptidergic nociceptors, whereas DPP6 is absent in sensory neurons. In the spinal cord, KChIP1 is coexpressed with Kv4.3 in the cell bodies of a subset of lamina II excitatory interneurons, while KChIP1, KChIP2, and DPP6 are colocalized with Kv4.2 and Kv4.3 in their dendrites. Within the dorsal horn, besides KChIP3 in the inner lamina II and lamina III, we detected DPP10 in most projection neurons, which transmit pain signal to brain. The results suggest the existence of Kv4/KChIP/DPPL ternary complexes in ISA -expressing nociceptors and pain-modulating spinal interneurons.
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Affiliation(s)
- Chau-Fu Cheng
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Wan-Chen Wang
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Chia-Yi Huang
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Po-Hau Du
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Jung-Hui Yang
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Meei-Ling Tsaur
- Institute of Neuroscience, Brain Research Center, National Yang-Ming University, Taipei, Taiwan
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Park J, Trinh VN, Sears-Kraxberger I, Li KW, Steward O, Luo ZD. Synaptic ultrastructure changes in trigeminocervical complex posttrigeminal nerve injury. J Comp Neurol 2015; 524:309-22. [PMID: 26132987 DOI: 10.1002/cne.23844] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 06/23/2015] [Accepted: 06/25/2015] [Indexed: 12/20/2022]
Abstract
Trigeminal nerves collecting sensory information from the orofacial area synapse on second-order neurons in the dorsal horn of subnucleus caudalis and cervical C1/C2 spinal cord (Vc/C2, or trigeminocervical complex), which is critical for sensory information processing. Injury to the trigeminal nerves may cause maladaptive changes in synaptic connectivity that plays an important role in chronic pain development. Here we examined whether injury to the infraorbital nerve, a branch of the trigeminal nerves, led to synaptic ultrastructural changes when the injured animals have developed neuropathic pain states. Transmission electron microscopy was used to examine synaptic profiles in Vc/C2 at 3 weeks postinjury, corresponding to the time of peak behavioral hypersensitivity following chronic constriction injury to the infraorbital nerve (CCI-ION). Using established criteria, synaptic profiles were classified as associated with excitatory (R-), inhibitory (F-), and primary afferent (C-) terminals. Each type was counted within the superficial dorsal horn of the Vc/C2 and the means from each rat were compared between sham and injured animals; synaptic contact length was also measured. The overall analysis indicates that rats with orofacial pain states had increased numbers and decreased mean synaptic length of R-profiles within the Vc/C2 superficial dorsal horn (lamina I) 3 weeks post-CCI-ION. Increases in the number of excitatory synapses in the superficial dorsal horn of Vc/C2 could lead to enhanced activation of nociceptive pathways, contributing to the development of orofacial pain states.
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Affiliation(s)
- John Park
- Department of Pharmacology, University of California Irvine, School of Medicine, Irvine, California, 92697
| | - Van Nancy Trinh
- Department of Anesthesiology & Perioperative Care, University of California Irvine, School of Medicine, Irvine, California, 92697
| | - Ilse Sears-Kraxberger
- Reeve-Irvine Research Center, University of California Irvine, School of Medicine, Irvine, California, 92697
| | - Kang-Wu Li
- Department of Anesthesiology & Perioperative Care, University of California Irvine, School of Medicine, Irvine, California, 92697
| | - Oswald Steward
- Reeve-Irvine Research Center, University of California Irvine, School of Medicine, Irvine, California, 92697
| | - Z David Luo
- Department of Pharmacology, University of California Irvine, School of Medicine, Irvine, California, 92697.,Department of Anesthesiology & Perioperative Care, University of California Irvine, School of Medicine, Irvine, California, 92697.,Reeve-Irvine Research Center, University of California Irvine, School of Medicine, Irvine, California, 92697
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