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Torii K, Ohi K, Fujikane D, Takai K, Kuramitsu A, Muto Y, Sugiyama S, Shioiri T. Tissue-specific gene expression of genome-wide significant loci associated with major depressive disorder subtypes. Prog Neuropsychopharmacol Biol Psychiatry 2024; 133:111019. [PMID: 38663672 DOI: 10.1016/j.pnpbp.2024.111019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 04/16/2024] [Accepted: 04/23/2024] [Indexed: 04/29/2024]
Abstract
Major depressive disorder (MDD) is a clinically and genetically heterogeneous disorder. To reduce heterogeneity, large-scale genome-wide association studies have recently identified genome-wide significant loci associated with seven MDD subtypes. However, it was unclear in which tissues the genes near those loci are specifically expressed. We investigated whether genes related to specific MDD subtypes would be preferably expressed in a specific tissue. At 14 novel subtype-specific loci related to seven MDD subtypes-(1) non-atypical-like features MDD, (2) early-onset MDD, (3) recurrent MDD, (4) MDD with suicidal thoughts, (5) MDD without suicidal thoughts, (6) MDD with moderate impairment, and (7) postpartum depression, we investigated whether 22 genome-wide significant genetic variant-mapped genes were tissue-specifically expressed in brain, female reproductive, male specific, cardiovascular, gastrointestinal, or urinary tissues in the Genotype-Tissue Expression (GTEx) subjects (n ≤ 948). To confirm the tissue-specific expression in the GTEx, we used independent Human Protein Atlas (HPA) RNA-seq subjects (n ≤ 95). Of 22 genes, nine and five genes were tissue-specifically expressed in brain and female reproductive tissues, respectively (p < 2.27 × 10-3). RTN1, ERBB4, and AMIGO1 related to early-onset MDD, recurrent MDD, or MDD with suicidal thoughts were highly expressed in brain tissues (d = 1.19-2.71), while OAS1, LRRC9, DHRS7, PSMA5, SYPL2, and GULP1 related to non-atypical-like features MDD, early-onset MDD, MDD with suicidal thoughts, or postpartum depression were expressed at low levels in brain tissues (d = -0.17--1.48). DFNA5, CTBP2, PCNX4, SDCCAG8, and GULP1, which are related to early-onset MDD, MDD with moderate impairment, or postpartum depression, were highly expressed in female reproductive tissues (d = 0.80-2.08). Brain and female reproductive tissue-specific expression was confirmed in the HPA RNA-seq subjects. Our findings suggest that brain and female reproductive tissue-specific expression might contribute to the pathogenesis of MDD subtypes.
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Affiliation(s)
- Kaai Torii
- School of Medicine, Gifu University, Gifu, Japan
| | - Kazutaka Ohi
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan; Department of General Internal Medicine, Kanazawa Medical University, Ishikawa, Japan.
| | - Daisuke Fujikane
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Kentaro Takai
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Ayumi Kuramitsu
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yukimasa Muto
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Shunsuke Sugiyama
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Toshiki Shioiri
- Department of Psychiatry, Gifu University Graduate School of Medicine, Gifu, Japan
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2
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Lee BH, Cevizci M, Lieblich SE, Ibrahim M, Wen Y, Eid RS, Lamers Y, Duarte-Guterman P, Galea LAM. Exploring the parity paradox: Differential effects on neuroplasticity and inflammation by APOEe4 genotype at middle age. Brain Behav Immun 2024; 120:54-70. [PMID: 38772427 DOI: 10.1016/j.bbi.2024.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 04/20/2024] [Accepted: 05/18/2024] [Indexed: 05/23/2024] Open
Abstract
Female sex and Apolipoprotein E (APOE) ε4 genotype are top non-modifiable risk factors for Alzheimer's disease (AD). Although female-unique experiences like parity (pregnancy and motherhood) have positive effects on neuroplasticity at middle age, previous pregnancy may also contribute to AD risk. To explore these seemingly paradoxical long-term effects of parity, we investigated the impact of parity with APOEε4 genotype by examining behavioural and neural biomarkers of brain health in middle-aged female rats. Our findings show that primiparous (parous one time) hAPOEε4 rats display increased use of a non-spatial cognitive strategy and exhibit decreased number and recruitment of new-born neurons in the ventral dentate gyrus of the hippocampus in response to spatial working memory retrieval. Furthermore, primiparity and hAPOEε4 genotype synergistically modulate inflammatory markers in the ventral hippocampus. Collectively, these findings demonstrate that previous parity in hAPOEε4 rats confers an added risk to present with reduced activity and engagement of the hippocampus as well as elevated pro-inflammatory signaling, and underscore the importance of considering female-specific factors and genotype in health research.
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Affiliation(s)
- Bonnie H Lee
- Graduate Program in Neuroscience, University of British Columbia, Vancouver, BC, Canada; Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Melike Cevizci
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada
| | - Stephanie E Lieblich
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada
| | - Muna Ibrahim
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada
| | - Yanhua Wen
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada
| | - Rand S Eid
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Yvonne Lamers
- Food Nutrition and Health Program, Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, Canada
| | - Paula Duarte-Guterman
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada
| | - Liisa A M Galea
- Graduate Program in Neuroscience, University of British Columbia, Vancouver, BC, Canada; Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada; Department of Psychology, University of British Columbia, Vancouver, BC, Canada; Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada; Department of Psychiatry, University of Toronto, ON, Canada.
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3
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Machado GDB, Schnitzler AL, Fleischer AW, Beamish SB, Frick KM. G protein-coupled estrogen receptor (GPER) in the dorsal hippocampus regulates memory consolidation in gonadectomized male mice, likely via different signaling mechanisms than in female mice. Horm Behav 2024; 161:105516. [PMID: 38428223 PMCID: PMC11065565 DOI: 10.1016/j.yhbeh.2024.105516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 02/12/2024] [Accepted: 02/20/2024] [Indexed: 03/03/2024]
Abstract
Studies in ovariectomized (OVX) female rodents suggest that G protein-coupled estrogen receptor (GPER) is a key regulator of memory, yet little is known about its importance to memory in males or the cellular mechanisms underlying its mnemonic effects in either sex. In OVX mice, bilateral infusion of the GPER agonist G-1 into the dorsal hippocampus (DH) enhances object recognition and spatial memory consolidation in a manner dependent on rapid activation of c-Jun N-terminal kinase (JNK) signaling, cofilin phosphorylation, and actin polymerization in the DH. However, the effects of GPER on memory consolidation and DH cell signaling in males are unknown. Thus, the present study first assessed effects of DH infusion of G-1 or the GPER antagonist G-15 on object recognition and spatial memory consolidation in gonadectomized (GDX) male mice. As in OVX mice, immediate post-training bilateral DH infusion of G-1 enhanced, whereas G-15 impaired, memory consolidation in the object recognition and object placement tasks. However, G-1 did not increase levels of phosphorylated JNK (p46, p54) or cofilin in the DH 5, 15, or 30 min after infusion, nor did it affect phosphorylation of ERK (p42, p44), PI3K, or Akt. Levels of phospho-cAMP-responsive element binding protein (CREB) were elevated in the DH 30 min following G-1 infusion, indicating that GPER in males activates a yet unknown signaling mechanism that triggers CREB-mediated gene transcription. Our findings show for the first time that GPER in the DH regulates memory consolidation in males and suggests sex differences in underlying signaling mechanisms.
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Affiliation(s)
- Gustavo D B Machado
- University of Wisconsin-Milwaukee, Department of Psychology, Milwaukee, WI 53211, United States of America
| | - Alexis L Schnitzler
- University of Wisconsin-Milwaukee, Department of Psychology, Milwaukee, WI 53211, United States of America
| | - Aaron W Fleischer
- University of Wisconsin-Milwaukee, Department of Psychology, Milwaukee, WI 53211, United States of America
| | - Sarah B Beamish
- University of Wisconsin-Milwaukee, Department of Psychology, Milwaukee, WI 53211, United States of America
| | - Karyn M Frick
- University of Wisconsin-Milwaukee, Department of Psychology, Milwaukee, WI 53211, United States of America.
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Keane SP, Chadman KK, Gomez AR, Hu W. Pros and cons of narrow- versus wide-compartment rotarod apparatus: An experimental study in mice. Behav Brain Res 2024; 463:114901. [PMID: 38341101 DOI: 10.1016/j.bbr.2024.114901] [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: 11/02/2023] [Revised: 01/23/2024] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
The rotarod test, a sensorimotor assessment that allows for quantitative evaluation of motor coordination in rodents, has extensive application in many research fields. The test results exhibit extreme between-study variability, sometimes making it challenging to conclude the validity of certain disease models and related therapeutic effects. Although the variation in test paradigms may account for this disparity, some features of rotarod apparatus including rod diameter make differences. However, it is unknown whether the width of animal compartment has a role in rotarod performance. Here we comprehensively evaluated the active rotarod performance and adverse incidents in multiple strains of mice on an 11-cm- or a 5-cm-wide compartment apparatus. We found that mouse behaviors on these apparatuses were surprisingly different. It took a markedly longer time to train mice on the narrow- than wide-compartment rotarod. Further, non-transgenic B6129S and tau knockout mice aged 11 months and beyond showed different levels of improvement based on the compartment width. These mice had no overt improvements on accelerating rotarod over 4-5 training sessions on the narrow compartment, contrary to marked progress on the wide counterpart. The incidents of mice passively somersaulting round and fragmented running occurred significantly more on the wide than narrow compartment during accelerating rotarod sessions. Mice fell off rod more frequently on narrow than wide compartments upon attempt to turn around and when moving backward on rod. The pros and cons of narrow versus wide compartments are informative as to how to choose a rotarod apparatus that best fits the animal models used.
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Affiliation(s)
- Sachiko P Keane
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Kathryn K Chadman
- Department of Developmental Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Andres R Gomez
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Wen Hu
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA.
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5
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Le AA, Palmer LC, Chavez J, Gall CM, Lynch G. Sex differences in the context dependency of episodic memory. Front Behav Neurosci 2024; 18:1349053. [PMID: 38516050 PMCID: PMC10956361 DOI: 10.3389/fnbeh.2024.1349053] [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: 12/04/2023] [Accepted: 02/20/2024] [Indexed: 03/23/2024] Open
Abstract
Context contributes to multiple aspects of human episodic memory including segmentation and retrieval. The present studies tested if, in adult male and female mice, context influences the encoding of odors encountered in a single unsupervised sampling session of the type used for the routine acquisition of episodic memories. The three paradigms used differed in complexity (single vs. multiple odor cues) and period from sampling to testing. Results show that males consistently encode odors in a context-dependent manner: the mice discriminated novel from previously sampled cues when tested in the chamber of initial cue sampling but not in a distinct yet familiar chamber. This was independent of the interval between cue encounters or the latency from initial sampling to testing. In contrast, female mice acquired both single cues and the elements of multi-cue episodes, but recall of that information was dependent upon the surrounding context only when the cues were presented serially. These results extend the list of episodic memory features expressed by rodents and also introduce a striking and unexpected sex difference in context effects.
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Affiliation(s)
- Aliza A. Le
- Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, United States
| | - Linda C. Palmer
- Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, United States
| | - Jasmine Chavez
- Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, United States
| | - Christine M. Gall
- Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, United States
- Department of Neurobiology and Behavior, University of California, Irvine, Irvine, CA, United States
| | - Gary Lynch
- Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, United States
- Department of Psychiatry and Human Behavior, University of California, Irvine, Irvine, CA, United States
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Pradhyumnan H, Perez GG, Patel SH, Blaya MO, Bramlett HM, Raval AP. A Perspective on Hormonal Contraception Usage in Central Nervous System Injury. J Neurotrauma 2024; 41:541-551. [PMID: 37975282 DOI: 10.1089/neu.2023.0219] [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] [Indexed: 11/19/2023] Open
Abstract
Naturally occurring life stages in women are associated with changes in the milieu of endogenous ovarian hormones. Women of childbearing age may be exposed to exogenous ovarian hormone(s) because of their use of varying combinations of estrogen and progesterone hormones-containing oral contraceptives (OC; also known as "the pill"). If women have central nervous system (CNS) injury such as spinal cord injury (SCI) and traumatic brain injury (TBI) during their childbearing age, they are likely to retain their reproductive capabilities and may use OC. Many deleterious side effects of long-term OC use have been reported, such as aberrant blood clotting and endothelial dysfunction that consequently increase the risk of myocardial infarction, venous thromboembolism, and ischemic brain injury. Although controversial, studies have suggested that OC use is associated with neuropsychiatric ramifications, including uncontrollable mood swings and poorer cognitive performance. Our understanding about how the combination of endogenous hormones and OC-conferred exogenous hormones affect outcomes after CNS injuries remains limited. Therefore, understanding the impact of OC use on CNS injury outcomes needs further investigation to reveal underlying mechanisms, promote reporting in clinical or epidemiological studies, and raise awareness of possible compounded consequences. The goal of the current review is to discuss the impacts of CNS injury on endogenous ovarian hormones and vice-versa, as well as the putative consequences of exogenous ovarian hormones (OC) on the CNS to identify potential gaps in our knowledge to consider for future laboratory, epidemiological, and clinical studies.
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Affiliation(s)
- Hari Pradhyumnan
- Peritz Scheinberg Cerebral Vascular Disease Research Laboratory (CVDRL), Department of Neurology, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Gina G Perez
- Peritz Scheinberg Cerebral Vascular Disease Research Laboratory (CVDRL), Department of Neurology, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Shahil H Patel
- Peritz Scheinberg Cerebral Vascular Disease Research Laboratory (CVDRL), Department of Neurology, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Meghan O Blaya
- Department of Neurological Surgery, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
- The Miami Project to Cure Paralysis, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Helen M Bramlett
- Department of Neurological Surgery, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
- The Miami Project to Cure Paralysis, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
- Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, Florida, USA
| | - Ami P Raval
- Peritz Scheinberg Cerebral Vascular Disease Research Laboratory (CVDRL), Department of Neurology, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida, USA
- Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, Florida, USA
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7
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Kundakovic M, Tickerhoof M. Epigenetic mechanisms underlying sex differences in the brain and behavior. Trends Neurosci 2024; 47:18-35. [PMID: 37968206 PMCID: PMC10841872 DOI: 10.1016/j.tins.2023.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/21/2023] [Accepted: 09/26/2023] [Indexed: 11/17/2023]
Abstract
Sex differences are found across brain regions, behaviors, and brain diseases. Sexual differentiation of the brain is initiated prenatally but it continues throughout life, as a result of the interaction of three major factors: gonadal hormones, sex chromosomes, and the environment. These factors are thought to act, in part, via epigenetic mechanisms which control chromatin and transcriptional states in brain cells. In this review, we discuss evidence that epigenetic mechanisms underlie sex-specific neurobehavioral changes during critical organizational periods, across the estrous cycle, and in response to diverse environments throughout life. We further identify future directions for the field that will provide novel mechanistic insights into brain sex differences, inform brain disease treatments and women's brain health in particular, and apply to people across genders.
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Affiliation(s)
- Marija Kundakovic
- Department of Biological Sciences, Fordham University, Bronx, NY 10458, USA.
| | - Maria Tickerhoof
- Department of Biological Sciences, Fordham University, Bronx, NY 10458, USA
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Zhu TT, Wang H, Liu PM, Gu HW, Pan WT, Zhao MM, Hashimoto K, Yang JJ. Clemastine-induced enhancement of hippocampal myelination alleviates memory impairment in mice with chronic pain. Neurobiol Dis 2024; 190:106375. [PMID: 38092269 DOI: 10.1016/j.nbd.2023.106375] [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: 11/24/2023] [Revised: 12/06/2023] [Accepted: 12/09/2023] [Indexed: 12/17/2023] Open
Abstract
Patients with chronic pain often experience memory impairment, but the underlying mechanisms remain elusive. The myelin sheath is crucial for rapid and accurate action potential conduction, playing a pivotal role in the development of cognitive abilities in the central nervous system. The study reveals that myelin degradation occurs in the hippocampus of chronic constriction injury (CCI) mice, which display both chronic pain and memory impairment. Using fiber photometry, we observed diminished task-related neuronal activity in the hippocampus of CCI mice. Interestingly, the repeated administration with clemastine, which promotes myelination, counteracts the CCI-induced myelin loss and reduced neuronal activity. Notably, clemastine specifically ameliorates the impaired memory without affecting chronic pain in CCI mice. Overall, our findings highlight the significant role of myelin abnormalities in CCI-induced memory impairment, suggesting a potential therapeutic approach for treating memory impairments associated with neuropathic pain.
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Affiliation(s)
- Ting-Ting Zhu
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Neuroscience Research Institute, Academy of Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - He Wang
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Pan-Miao Liu
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Neuroscience Research Institute, Academy of Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - Han-Wen Gu
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Wei-Tong Pan
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Neuroscience Research Institute, Academy of Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - Ming-Ming Zhao
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Kenji Hashimoto
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba 260-8670, Japan.
| | - Jian-Jun Yang
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Neuroscience Research Institute, Academy of Medical Sciences, Zhengzhou University, Zhengzhou 450052, China.
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9
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Zhvania M, Japaridze N, Tizabi Y, Lomidze N, Pochkhidze N, Rzayev F, Gasimov E. Differential effects of aging on hippocampal ultrastructure in male vs. female rats. Biogerontology 2023; 24:925-935. [PMID: 37515624 DOI: 10.1007/s10522-023-10052-z] [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: 04/28/2023] [Accepted: 07/09/2023] [Indexed: 07/31/2023]
Abstract
Age-related decline in physical and cognitive functions are facts of life that do not affect everyone to the same extent. We had reported earlier that such cognitive decline is both sex- and context-dependent. Moreover, age-associated ultrastructural changes were observed in the hippocampus of male rats. In this study, we sought to determine potential differences in ultrastructural changes between male and female rats at various stages of life. We performed quantitative electron microscopic evaluation of hippocampal CA1 region, an area intimately involved in cognitive behavior, in both male and female adolescent, adult and old Wistar rats. Specifically, we measured the number of docking synaptic vesicles in axo-dendritic synapses, the length of active zone as well as the total number of synaptic vesicles. Distinct age- and sex-dependent effects were observed in several parameters. Thus, adult female rats had the lowest synaptic active zone compared to both adolescent and old female rats. Moreover, the same parameter was significantly lower in adult and old female rats compared to their male counterparts. On the other hand, old male rats had significantly lower number of total synaptic vesicles compared to both adolescent and adult male rats as well as compared to their female counterparts. Taken together, it may be suggested that age- and sex-dependent ultrastructural changes in the hippocampus may underlie at least some of the differences in cognitive functions among these groups.
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Affiliation(s)
- Mzia Zhvania
- School of Natural Sciences and Medicine, Ilia State University, 3/5 K. Cholokashvili Avenue, 0162, Tbilisi, Georgia.
- Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia.
| | - Nadezhda Japaridze
- Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
- New Vision University, Tbilisi, Georgia
| | - Yousef Tizabi
- Department of Pharmacology, Howard University College of Medicine, Washington, DC, USA
| | - Nino Lomidze
- School of Natural Sciences and Medicine, Ilia State University, 3/5 K. Cholokashvili Avenue, 0162, Tbilisi, Georgia
- Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Nino Pochkhidze
- School of Natural Sciences and Medicine, Ilia State University, 3/5 K. Cholokashvili Avenue, 0162, Tbilisi, Georgia
- Department of Brain Ultrastructure and Nanoarchitecture, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia
| | - Fuad Rzayev
- Department of Histology, Embryology and Cytology, Azerbaijan Medical University, Baku, Azerbaijan
| | - Eldar Gasimov
- Department of Histology, Embryology and Cytology, Azerbaijan Medical University, Baku, Azerbaijan
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Pronier É, Morici JF, Girardeau G. The role of the hippocampus in the consolidation of emotional memories during sleep. Trends Neurosci 2023; 46:912-925. [PMID: 37714808 DOI: 10.1016/j.tins.2023.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 07/23/2023] [Accepted: 08/09/2023] [Indexed: 09/17/2023]
Abstract
Episodic memory relies on the hippocampus, a heterogeneous brain region with distinct functions. Spatial representations in the dorsal hippocampus (dHPC) are crucial for contextual memory, while the ventral hippocampus (vHPC) is more involved in emotional processing. Here, we review the literature in rodents highlighting the anatomical and functional properties of the hippocampus along its dorsoventral axis that underlie its role in contextual and emotional memory encoding, consolidation, and retrieval. We propose that the coordination between the dorsal and vHPC through theta oscillations during rapid eye movement (REM) sleep, and through sharp-wave ripples during non-REM (NREM) sleep, might facilitate the transfer of contextual information for integration with valence-related processing in other structures of the network. Further investigation into the physiology of the vHPC and its connections with other brain areas is needed to deepen the current understanding of emotional memory consolidation during sleep.
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Affiliation(s)
- Éléonore Pronier
- Institut du Fer à Moulin, Inserm U1270, Sorbonne Université, Paris, France
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11
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Zhou SF, Li SJ, Zhao TS, Liu Y, Li CQ, Cui YH, Li F. Female rats prefer to forage food from males, an effect that is not influenced by stress. Behav Brain Res 2023; 452:114597. [PMID: 37487838 DOI: 10.1016/j.bbr.2023.114597] [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: 04/27/2023] [Revised: 07/10/2023] [Accepted: 07/21/2023] [Indexed: 07/26/2023]
Abstract
As social beings, animals and humans alike make real life decisions that are often influenced by other members. Most current research has focused on the influence of same-sex peers on individual decision-making, with potential opposite sex effect scarcely explored. Here, we developed a behavioral model to observe food foraging decision-making in female rats under various social situations. We found that female rats preferred to forage food from male over female rats or from the no-rat storage side. Female rats were more likely to forage food from familiar males than from unfamiliar. This opposite-sex preference was not altered by the lure of sweet food, or with estrous cycle, nor under stress conditions. These results suggest that the opposite sex influences food foraging decision-making in female rats. The behavioral model established could facilitate future investigation into the underlying neurobiological mechanisms.
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Affiliation(s)
- Shi-Fen Zhou
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, China
| | - Song-Ji Li
- The International-Joint Lab for Non-invasive Neural Modulation/Key Laboratory for the Brain Research of Henan Province, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Tian-Shu Zhao
- Department of Psychiatry, National Clinical Research Center for Mental Disorders, and National Center for Mental Disorders, The Second Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Yu Liu
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, China
| | - Chang-Qi Li
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, China
| | - Yan-Hui Cui
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, China.
| | - Fang Li
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, China.
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Melcangi RC. Editorial. J Neuroendocrinol 2023; 35:e13244. [PMID: 36881597 DOI: 10.1111/jne.13244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 02/09/2023] [Indexed: 02/16/2023]
Affiliation(s)
- Roberto Cosimo Melcangi
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università degli Studi di Milano, Milan, Italy
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