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Stress-induced changes in the molecular processes underlying fear memories: implications for PTSD and relevant animal models
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-31 DOI: 10.1038/s41380-025-02910-8
Raül Andero

Most of the fear literature on humans and animals tests healthy individuals. However, fear memories can differ between healthy individuals and those previously exposed to traumatic stress, such as a car accident, sexual abuse, military combat and personal assault. Traumatic stress can lead to post-traumatic stress disorder (PTSD) which presents alterations in fear memories, such as an impairment of fear extinction and extinction recall. PTSD-like animal models are exposed to a single highly stressful experience in the laboratory, such as stress immobilization or single-prolonged stress. Some days later, animals exposed to a PTSD-like model can be tested in fear procedures that help uncover molecular mechanisms of fear memories. In this review, there are discussed the molecular mechanisms in stress-induced fear memories of patients with PTSD and PTSD-like animal models. The focus is on the effects of estradiol and cortisol/corticosterone hormones and of different genes, such as FKBP prolyl isomerase 5 gene (FKBP5) - FK506 binding protein 51 (FKBP51), pituitary adenylate cyclase-activating peptide (PACAP) - pituitary adenylate cyclase-activating polypeptide type I receptor (PAC1R), endocannabinoid (eCB) system and the tropomyosin receptor kinase B (TrkB) - brain-derived neurotrophic factor (BDNF). The conclusion is that greater emphasis should be placed on investigating the molecular mechanisms of fear memories in PTSD, through direct testing of patients with PTSD or the use of relevant PTSD-like models.

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引用次数: 0
Dopaminergic deficits along the spectrum of Alzheimer’s disease
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-31 DOI: 10.1038/s41380-025-02913-5
Andrea Pilotto, Alice Galli, Arianna Sala, Silvia Paola Caminiti, Luca Presotto, Claudio Liguori, Nicola Biagio Mercuri, Enrico Premi, Valentina Garibotto, Giovanni Frisoni, Agostino Chiaravalloti, Orazio Schillaci, Marcello D’Amelio, Barbara Paghera, Silvia Lucchini, Francesco Bertagna, Daniela Perani, Alessandro Padovani

Both post-mortem and in vivo data argue for dopamine dysfunction in patients with Alzheimer’s Disease (AD). However, the timing and regional progression of dopaminergic systems alterations in AD are still debated. The aim of the study was to investigate in vivo the pattern of dopaminergic changes and connectivity using DAT-SPECT imaging in patients across the AD spectrum. Fifty-nine AD patients (n = 21 AD-MCI; n = 38 AD-DEM) and a control group (CG) of n = 45 age- and sex-matched individuals entered the study and underwent 123I-FP-CIT dopaminergic imaging. The occipital binding was used as reference region to obtain single-subject binding in different brain regions. Between-group differences in 123I-FP-CIT binding in both mesolimbic and nigrostriatal dopaminergic pathways were assessed using an ANCOVA test, adjusting for the effect of center of imaging acquisition, age, and sex. Regions resulting from the voxel-wise direct comparison between AD-MCI and AD-DEM were considered as a seed of interest for a voxel-wise interregional correlation analysis. Both AD-MCI and AD-DEM patients showed dopaminergic depletion within the basal ganglia, whereas cortico-limbic regions (namely hippocampus, amygdala, anterior and middle cingulate, frontal cortex and thalamus) resulted impaired only in the dementia phase. The brain voxel-wise interregional correlation analysis showed a progressive pattern of disruption of caudate/thalamus dopaminergic connectivity to hippocampus and amygdala from AD-MCI to AD-DEM stages. This study indicates basal ganglia dopaminergic alterations and connectivity disruption in the nigrostriatal and mesolimbic systems already in early stage AD, extending to several cortico-limbic regions in dementia phases.

{"title":"Dopaminergic deficits along the spectrum of Alzheimer’s disease","authors":"Andrea Pilotto, Alice Galli, Arianna Sala, Silvia Paola Caminiti, Luca Presotto, Claudio Liguori, Nicola Biagio Mercuri, Enrico Premi, Valentina Garibotto, Giovanni Frisoni, Agostino Chiaravalloti, Orazio Schillaci, Marcello D’Amelio, Barbara Paghera, Silvia Lucchini, Francesco Bertagna, Daniela Perani, Alessandro Padovani","doi":"10.1038/s41380-025-02913-5","DOIUrl":"https://doi.org/10.1038/s41380-025-02913-5","url":null,"abstract":"<p>Both post-mortem and in vivo data argue for dopamine dysfunction in patients with Alzheimer’s Disease (AD). However, the timing and regional progression of dopaminergic systems alterations in AD are still debated. The aim of the study was to investigate in vivo the pattern of dopaminergic changes and connectivity using DAT-SPECT imaging in patients across the AD spectrum. Fifty-nine AD patients (n = 21 AD-MCI; n = 38 AD-DEM) and a control group (CG) of n = 45 age- and sex-matched individuals entered the study and underwent <sup>123</sup>I-FP-CIT dopaminergic imaging. The occipital binding was used as reference region to obtain single-subject binding in different brain regions. Between-group differences in <sup>123</sup>I-FP-CIT binding in both mesolimbic and nigrostriatal dopaminergic pathways were assessed using an ANCOVA test, adjusting for the effect of center of imaging acquisition, age, and sex. Regions resulting from the voxel-wise direct comparison between AD-MCI and AD-DEM were considered as a seed of interest for a voxel-wise interregional correlation analysis. Both AD-MCI and AD-DEM patients showed dopaminergic depletion within the basal ganglia, whereas cortico-limbic regions (namely hippocampus, amygdala, anterior and middle cingulate, frontal cortex and thalamus) resulted impaired only in the dementia phase. The brain voxel-wise interregional correlation analysis showed a progressive pattern of disruption of caudate/thalamus dopaminergic connectivity to hippocampus and amygdala from AD-MCI to AD-DEM stages. This study indicates basal ganglia dopaminergic alterations and connectivity disruption in the nigrostriatal and mesolimbic systems already in early stage AD, extending to several cortico-limbic regions in dementia phases.</p>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"27 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synaptic vulnerability to amyloid-β and tau pathologies differentially disrupts emotional and memory neural circuits
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-30 DOI: 10.1038/s41380-025-02901-9
Maria Dolores Capilla-López, Angel Deprada, Yuniesky Andrade-Talavera, Irene Martínez-Gallego, Heriberto Coatl-Cuaya, Paula Sotillo, José Rodríguez-Alvarez, Antonio Rodríguez-Moreno, Arnaldo Parra-Damas, Carlos A. Saura

Alzheimer’s disease (AD) is characterized by memory loss and neuropsychiatric symptoms associated with cerebral amyloid-β (Aβ) and tau pathologies, but whether and how these factors differentially disrupt neural circuits remains unclear. Here, we investigated the vulnerability of memory and emotional circuits to Aβ and tau pathologies in mice expressing mutant human amyloid precursor protein (APP), Tau or both APP/Tau in excitatory neurons. APP/Tau mice develop age- and sex-dependent Aβ and phosphorylated tau pathologies, the latter exacerbated at early stages, in vulnerable brain regions. Early memory deficits were associated with hippocampal tau pathology in Tau and APP/Tau mice, whereas anxiety and fear appeared linked to intracellular Aβ in the basolateral amygdala (BLA) of APP and APP/Tau mice. Transcriptome hippocampal profiling revealed gene changes affecting myelination and RNA processing in Tau mice, and inflammation and synaptic-related pathways in APP/Tau mice at 6 months. At 9 months, we detected common and region-specific changes in astrocytic, microglia and 63 AD-associated genes in the hippocampus and BLA of APP/Tau mice. Spatial learning deficits were associated with synaptic tau accumulation and synapse disruption in the hippocampus of Tau and APP/Tau mice, whereas emotional disturbances were linked to Aβ pathology but not synaptic tau in the BLA. Interestingly, Aβ and tau exhibited synergistic detrimental effects in long-term potentiation (LTP) in the hippocampus but they counteract with each other to mitigate LTP impairments in the amygdala. These findings indicate that Aβ and tau pathologies cause region-specific effects and synergize to induce synaptic dysfunction and immune responses, contributing to the differing vulnerability of memory and emotional neural circuits in AD.

{"title":"Synaptic vulnerability to amyloid-β and tau pathologies differentially disrupts emotional and memory neural circuits","authors":"Maria Dolores Capilla-López, Angel Deprada, Yuniesky Andrade-Talavera, Irene Martínez-Gallego, Heriberto Coatl-Cuaya, Paula Sotillo, José Rodríguez-Alvarez, Antonio Rodríguez-Moreno, Arnaldo Parra-Damas, Carlos A. Saura","doi":"10.1038/s41380-025-02901-9","DOIUrl":"https://doi.org/10.1038/s41380-025-02901-9","url":null,"abstract":"<p>Alzheimer’s disease (AD) is characterized by memory loss and neuropsychiatric symptoms associated with cerebral amyloid-β (Aβ) and tau pathologies, but whether and how these factors differentially disrupt neural circuits remains unclear. Here, we investigated the vulnerability of memory and emotional circuits to Aβ and tau pathologies in mice expressing mutant human amyloid precursor protein (APP), Tau or both APP/Tau in excitatory neurons. APP/Tau mice develop age- and sex-dependent Aβ and phosphorylated tau pathologies, the latter exacerbated at early stages, in vulnerable brain regions. Early memory deficits were associated with hippocampal tau pathology in Tau and APP/Tau mice, whereas anxiety and fear appeared linked to intracellular Aβ in the basolateral amygdala (BLA) of APP and APP/Tau mice. Transcriptome hippocampal profiling revealed gene changes affecting myelination and RNA processing in Tau mice, and inflammation and synaptic-related pathways in APP/Tau mice at 6 months. At 9 months, we detected common and region-specific changes in astrocytic, microglia and 63 AD-associated genes in the hippocampus and BLA of APP/Tau mice. Spatial learning deficits were associated with synaptic tau accumulation and synapse disruption in the hippocampus of Tau and APP/Tau mice, whereas emotional disturbances were linked to Aβ pathology but not synaptic tau in the BLA. Interestingly, Aβ and tau exhibited synergistic detrimental effects in long-term potentiation (LTP) in the hippocampus but they counteract with each other to mitigate LTP impairments in the amygdala. These findings indicate that Aβ and tau pathologies cause region-specific effects and synergize to induce synaptic dysfunction and immune responses, contributing to the differing vulnerability of memory and emotional neural circuits in AD.</p><figure></figure>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"53 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Genetic associations between orexin genes and phenotypes related to behavioral regulation in humans, including substance use
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-29 DOI: 10.1038/s41380-025-02895-4
Fazil Aliev, David De Sa Nogueira, Gary Aston-Jones, Danielle M. Dick

The hypothalamic neuropeptide system of orexin (hypocretin) neurons provides projections throughout the neuraxis and has been linked to sleep regulation, feeding and motivation for salient rewards including drugs of abuse. However, relatively little has been done to examine genes associated with orexin signaling and specific behavioral phenotypes in humans. Here, we tested for association of twenty-seven genes involved in orexin signaling with behavioral phenotypes in humans. We tested the full gene set, functional subsets, and individual genes involved in orexin signaling. Our primary phenotype of interest was Externalizing, a composite factor comprised of behaviors and disorders associated with reward-seeking, motivation, and behavioral regulation. We also tested for association with additional phenotypes that have been related to orexin regulation in model organism studies, including alcohol consumption, problematic alcohol use, daytime sleepiness, insomnia, cigarettes per day, smoking initiation, and body mass index. The composite set of 27 genes corresponding to orexin function was highly associated with Externalizing, as well as with alcohol consumption, insomnia, cigarettes per day, smoking initiation and BMI. In addition, all gene subsets (except the OXR2/HCRTR2 subset) were associated with Externalizing. BMI was significantly associated with all gene subsets. The “validated factors for PPOX/HCRT” and “PPOX/HCRT upregulation” gene subsets also were associated with alcohol consumption. Individually, 8 genes showed a strong association with Externalizing, 12 with BMI, 7 with smoking initiation, 3 with alcohol consumption, and 2 with problematic alcohol use, after correction for multiple testing. This study indicates that orexin genes are associated with multiple behaviors and disorders related to self-regulation in humans. This is consistent with prior work in animals that implicated orexin signaling in motivational activation induced by salient stimuli, and supports the hypothesis that orexin signaling is an important potential therapeutic target for numerous behavioral disorders.

{"title":"Genetic associations between orexin genes and phenotypes related to behavioral regulation in humans, including substance use","authors":"Fazil Aliev, David De Sa Nogueira, Gary Aston-Jones, Danielle M. Dick","doi":"10.1038/s41380-025-02895-4","DOIUrl":"https://doi.org/10.1038/s41380-025-02895-4","url":null,"abstract":"<p>The hypothalamic neuropeptide system of orexin (hypocretin) neurons provides projections throughout the neuraxis and has been linked to sleep regulation, feeding and motivation for salient rewards including drugs of abuse. However, relatively little has been done to examine genes associated with orexin signaling and specific behavioral phenotypes in humans. Here, we tested for association of twenty-seven genes involved in orexin signaling with behavioral phenotypes in humans. We tested the full gene set, functional subsets, and individual genes involved in orexin signaling. Our primary phenotype of interest was Externalizing, a composite factor comprised of behaviors and disorders associated with reward-seeking, motivation, and behavioral regulation. We also tested for association with additional phenotypes that have been related to orexin regulation in model organism studies, including alcohol consumption, problematic alcohol use, daytime sleepiness, insomnia, cigarettes per day, smoking initiation, and body mass index. The composite set of 27 genes corresponding to orexin function was highly associated with Externalizing, as well as with alcohol consumption, insomnia, cigarettes per day, smoking initiation and BMI. In addition, all gene subsets (except the <i>OXR2/HCRTR2</i> subset) were associated with Externalizing. BMI was significantly associated with all gene subsets. The “validated factors for <i>PPOX</i>/<i>HCRT</i>” and “<i>PPOX</i>/<i>HCRT</i> upregulation” gene subsets also were associated with alcohol consumption. Individually, 8 genes showed a strong association with Externalizing, 12 with BMI, 7 with smoking initiation, 3 with alcohol consumption, and 2 with problematic alcohol use, after correction for multiple testing. This study indicates that orexin genes are associated with multiple behaviors and disorders related to self-regulation in humans. This is consistent with prior work in animals that implicated orexin signaling in motivational activation induced by salient stimuli, and supports the hypothesis that orexin signaling is an important potential therapeutic target for numerous behavioral disorders.</p>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"321 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Neural signatures of risk-taking adaptions across health, bipolar disorder, and lithium treatment
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-29 DOI: 10.1038/s41380-025-02900-w
Jacqueline Scholl, Priyanka Panchal, Natalie Nelissen, Lauren Z. Atkinson, Nils Kolling, Kate EA Saunders, John Geddes, Matthew FS Rushworth, Anna C. Nobre, Paul J. Harrison, Catherine J. Harmer

Cognitive and neural mechanisms underlying bipolar disorder (BD) and its treatment are still poorly understood. Here we examined the role of adaptations in risk-taking using a reward-guided decision-making task. We recruited volunteers with high (n = 40) scores on the Mood Disorder Questionnaire, MDQ, suspected of high risk for bipolar disorder and those with low-risk scores (n = 37). We also recruited patients diagnosed with BD who were assigned (randomized, double-blind) to six weeks of lithium (n = 19) or placebo (n = 16) after a two-week baseline period (n = 22 for FMRI). Participants completed mood ratings daily over 50 (MDQ study) or 42 (BD study) days, as well as a risky decision-making task and functional magnetic resonance imaging. The task measured adaptation of risk taking to past outcomes (increased risk aversion after a previous win vs. loss, ‘outcome history’). While the low MDQ group was risk averse after a win, this was less evident in the high MDQ group and least so in the patients with BD. During fMRI, ‘outcome history’ was linked to medial frontal pole activation at the time of the decision and this activation was reduced in the high risk MDQ vs. the low risk MDQ group. While lithium did not reverse the pattern of BD in the task, nor changed clinical symptoms of mania or depression, it changed reward processing in the dorsolateral prefrontal cortex. Participants’ modulation of risk-taking in response to reward outcomes was reduced as a function of risk for BD and diagnosed BD. These results provide a model for how reward may prime escalation of risk-related behaviours in bipolar disorder and how mood stabilising treatments may work.

{"title":"Neural signatures of risk-taking adaptions across health, bipolar disorder, and lithium treatment","authors":"Jacqueline Scholl, Priyanka Panchal, Natalie Nelissen, Lauren Z. Atkinson, Nils Kolling, Kate EA Saunders, John Geddes, Matthew FS Rushworth, Anna C. Nobre, Paul J. Harrison, Catherine J. Harmer","doi":"10.1038/s41380-025-02900-w","DOIUrl":"https://doi.org/10.1038/s41380-025-02900-w","url":null,"abstract":"<p>Cognitive and neural mechanisms underlying bipolar disorder (BD) and its treatment are still poorly understood. Here we examined the role of adaptations in risk-taking using a reward-guided decision-making task. We recruited volunteers with high (<i>n</i> = 40) scores on the Mood Disorder Questionnaire, MDQ, suspected of high risk for bipolar disorder and those with low-risk scores (<i>n</i> = 37). We also recruited patients diagnosed with BD who were assigned (randomized, double-blind) to six weeks of lithium (<i>n</i> = 19) or placebo (<i>n</i> = 16) after a two-week baseline period (<i>n</i> = 22 for FMRI). Participants completed mood ratings daily over 50 (MDQ study) or 42 (BD study) days, as well as a risky decision-making task and functional magnetic resonance imaging. The task measured adaptation of risk taking to past outcomes (increased risk aversion after a previous win vs. loss, ‘outcome history’). While the low MDQ group was risk averse after a win, this was less evident in the high MDQ group and least so in the patients with BD. During fMRI, ‘outcome history’ was linked to medial frontal pole activation at the time of the decision and this activation was reduced in the high risk MDQ vs. the low risk MDQ group. While lithium did not reverse the pattern of BD in the task, nor changed clinical symptoms of mania or depression, it changed reward processing in the dorsolateral prefrontal cortex. Participants’ modulation of risk-taking in response to reward outcomes was reduced as a function of risk for BD and diagnosed BD. These results provide a model for how reward may prime escalation of risk-related behaviours in bipolar disorder and how mood stabilising treatments may work.</p>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"9 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The genetics of neurodegenerative diseases is the genetics of age-related damage clearance failure
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-29 DOI: 10.1038/s41380-025-02911-7
John Hardy, Valentina Escott-Price

In this perspective we draw together the data from the genome wide association studies for Alzheimer’s disease, Parkinson’s disease and the tauopathies and reach the conclusion that in each case, most of the risk loci are involved in the clearance of the deposited proteins: in Alzheimer’s disease, the microglial removal of Aβ, in the synucleinopathies, the lysosomal clearance of synuclein and in the tauopathies, the removal of tau protein by the ubiquitin proteasome. We make the point that most loci identified through genome wide association studies are not strictly pathogenic but rather relate to failures to remove age related damage. We discuss these issues in the context of copathologies in elderly individuals and the prediction of disease through polygenic risk score analysis at different ages. Finally, we discuss what analytic approaches are needed now that we have adequately sized case control analyses in white populations.

{"title":"The genetics of neurodegenerative diseases is the genetics of age-related damage clearance failure","authors":"John Hardy, Valentina Escott-Price","doi":"10.1038/s41380-025-02911-7","DOIUrl":"https://doi.org/10.1038/s41380-025-02911-7","url":null,"abstract":"<p>In this perspective we draw together the data from the genome wide association studies for Alzheimer’s disease, Parkinson’s disease and the tauopathies and reach the conclusion that in each case, most of the risk loci are involved in the clearance of the deposited proteins: in Alzheimer’s disease, the microglial removal of Aβ, in the synucleinopathies, the lysosomal clearance of synuclein and in the tauopathies, the removal of tau protein by the ubiquitin proteasome. We make the point that most loci identified through genome wide association studies are not strictly pathogenic but rather relate to failures to remove age related damage. We discuss these issues in the context of copathologies in elderly individuals and the prediction of disease through polygenic risk score analysis at different ages. Finally, we discuss what analytic approaches are needed now that we have adequately sized case control analyses in white populations.</p>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"29 2 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aging disrupts the coordination between mRNA and protein expression in mouse and human midbrain
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-29 DOI: 10.1038/s41380-025-02909-1
Silas A. Buck, Samuel J. Mabry, Jill R. Glausier, Tabitha Banks-Tibbs, Caroline Ward, Jenesis Kozel, Chen Fu, Kenneth N. Fish, David A. Lewis, Ryan W. Logan, Zachary Freyberg

Age-related dopamine (DA) neuron loss is a primary feature of Parkinson’s disease. However, whether similar biological processes occur during healthy aging, but to a lesser degree, remains unclear. We therefore determined whether midbrain DA neurons degenerate during aging in mice and humans. In mice, we identified no difference in midbrain neuron numbers throughout aging. Despite this, we found age-related decreases in midbrain mRNA expression of tyrosine hydroxylase (Th), the rate limiting enzyme of DA synthesis. Among midbrain glutamatergic cells, we similarly identified age-related declines in vesicular glutamate transporter 2 (Vglut2) mRNA expression. In co-transmitting Th+/Vglut2+ neurons, Th and Vglut2 transcripts decreased with aging. However, Th and Vglut2 protein levels in striatal synaptic release sites (e.g., terminals and axonal projections) did not differ throughout aging. Similar to the mouse, an initial study of human brain showed no effect of aging on midbrain neuron number with a concomitant decrease in TH and VGLUT2 mRNA expression. Unlike in mice, the density of striatal TH+ dopaminergic terminals was lower in aged human subjects. However, TH and VGLUT2 protein levels were unaffected in the remaining striatal boutons. Finally, in contrast to Th and Vglut2 mRNA, expression of most ribosomal genes in Th+ neurons was either maintained or even upregulated during aging. This suggests a homeostatic mechanism where age-related declines in transcriptional efficiency are overcome by ongoing ribosomal translation. Overall, we demonstrate species-conserved transcriptional effects of aging in midbrain dopaminergic and glutamatergic neurons that are not accompanied by marked cell death or lower striatal protein expression. This opens the door to novel therapeutic approaches to maintain neurotransmission and bolster neuronal resilience.

{"title":"Aging disrupts the coordination between mRNA and protein expression in mouse and human midbrain","authors":"Silas A. Buck, Samuel J. Mabry, Jill R. Glausier, Tabitha Banks-Tibbs, Caroline Ward, Jenesis Kozel, Chen Fu, Kenneth N. Fish, David A. Lewis, Ryan W. Logan, Zachary Freyberg","doi":"10.1038/s41380-025-02909-1","DOIUrl":"https://doi.org/10.1038/s41380-025-02909-1","url":null,"abstract":"<p>Age-related dopamine (DA) neuron loss is a primary feature of Parkinson’s disease. However, whether similar biological processes occur during healthy aging, but to a lesser degree, remains unclear. We therefore determined whether midbrain DA neurons degenerate during aging in mice and humans. In mice, we identified no difference in midbrain neuron numbers throughout aging. Despite this, we found age-related decreases in midbrain mRNA expression of tyrosine hydroxylase (<i>Th</i>), the rate limiting enzyme of DA synthesis. Among midbrain glutamatergic cells, we similarly identified age-related declines in vesicular glutamate transporter 2 (<i>Vglut2</i>) mRNA expression. In co-transmitting <i>Th</i><sup>+</sup>/<i>Vglut2</i><sup>+</sup> neurons, <i>Th</i> and <i>Vglut2</i> transcripts decreased with aging. However, Th and Vglut2 protein levels in striatal synaptic release sites (<i>e.g</i>., terminals and axonal projections) did not differ throughout aging. Similar to the mouse, an initial study of human brain showed no effect of aging on midbrain neuron number with a concomitant decrease in <i>TH</i> and <i>VGLUT2</i> mRNA expression. Unlike in mice, the density of striatal TH<sup>+</sup> dopaminergic terminals was lower in aged human subjects. However, TH and VGLUT2 protein levels were unaffected in the remaining striatal boutons. Finally, in contrast to <i>Th</i> and <i>Vglut2</i> mRNA, expression of most ribosomal genes in <i>Th</i><sup>+</sup> neurons was either maintained or even upregulated during aging. This suggests a homeostatic mechanism where age-related declines in transcriptional efficiency are overcome by ongoing ribosomal translation. Overall, we demonstrate species-conserved transcriptional effects of aging in midbrain dopaminergic and glutamatergic neurons that are not accompanied by marked cell death or lower striatal protein expression. This opens the door to novel therapeutic approaches to maintain neurotransmission and bolster neuronal resilience.</p>","PeriodicalId":19008,"journal":{"name":"Molecular Psychiatry","volume":"9 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction: Assessment and ascertainment in psychiatric molecular genetics: challenges and opportunities for cross-disorder research.
IF 9.6 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-28 DOI: 10.1038/s41380-025-02914-4
Na Cai, Brad Verhulst, Ole A Andreassen, Jan Buitelaar, Howard J Edenberg, John M Hettema, Michael Gandal, Andrew Grotzinger, Katherine Jonas, Phil Lee, Travis T Mallard, Manuel Mattheisen, Michael C Neale, John I Nurnberger, Wouter J Peyrot, Elliot M Tucker-Drob, Jordan W Smoller, Kenneth S Kendler
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引用次数: 0
D1 dopamine receptor antagonists as a new therapeutic strategy to treat autistic-like behaviours in lysosomal storage disorders 将 D1 多巴胺受体拮抗剂作为治疗溶酶体储积症中自闭症样行为的新疗法
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-26 DOI: 10.1038/s41380-025-02904-6
Maria De Risi, Lorenzo Cusimano, Xabier Bujanda Cundin, Mariateresa Pizzo, Ylenia Gigante, Mariagrazia Monaco, Chiara Di Eugenio, Elvira De Leonibus

Lysosomal storage disorders characterized by defective heparan sulfate (HS) degradation, such as Mucopolysaccharidosis type IIIA-D (MPS-IIIA-D), result in neurodegeneration and dementia in children. However, dementia is preceded by severe autistic-like behaviours (ALBs), presenting as hyperactivity, stereotypies, social interaction deficits, and sleep disturbances. The absence of experimental studies on ALBs’ mechanisms in MPS-III has led clinicians to adopt symptomatic treatments, such as antipsychotics, which are used for non-genetic neuropsychiatric disorders. However, they have limited efficacy in MPS-III and lead to higher extrapyramidal effects, leaving ALBs in MPS-IIIA as an unmet medical need with a significant burden on patients and their families. Using mouse and cellular models of MPS-IIIA, we have previously shown that ALBs result from increased proliferation of mesencephalic dopamine neurons during embryogenesis. In adulthood, MPS-IIIA mice exhibit an imbalance of dopaminergic receptor subtypes, resulting in striatal overstimulation of the D1 dopamine receptor (D1R)-direct pathway, contrasting with a downregulation of the D2 dopamine receptor (D2R)-indirect pathway. In this study, we aimed to provide an evidence-based pharmacological approach for managing ALBs in MPS-IIIA. We hypothesized that rebalancing dopaminergic receptor signalling with a D1R antagonist, rather than a D2 antagonist, would lead to safe and effective treatment. Neither risperidone nor methylphenidate improves ALBs in the MPS-IIIA mouse model, with the former showing increased cataleptic (extrapyramidal-like) side effects compared to littermate wild-type animals. Methylphenidate, however, showed some beneficial effects on neuroinflammation and later manifesting dementia-like behaviours. In contrast, ecopipam, a D1 antagonist already used in the clinic for other neuropsychiatric disorders, rescues ALBs, cognition, D1 hyperactivity, and does not worsen neurodegenerative signs. These results align with recent evidence highlighting the clinical relevance of D1 antagonists for neuropsychiatric disorders and pave the way for their use in managing psychotic symptoms in neurodegenerative disorders such as dementia with Lewy bodies.

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引用次数: 0
Longitudinal evolution of the transdiagnostic prodrome to severe mental disorders: a dynamic temporal network analysis informed by natural language processing and electronic health records 严重精神障碍的跨诊断前驱症状的纵向演变:由自然语言处理和电子健康记录提供信息的动态时间网络分析
IF 11 1区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-01-22 DOI: 10.1038/s41380-025-02896-3
Maite Arribas, Joseph M. Barnby, Rashmi Patel, Robert A. McCutcheon, Daisy Kornblum, Hitesh Shetty, Kamil Krakowski, Daniel Stahl, Nikolaos Koutsouleris, Philip McGuire, Paolo Fusar-Poli, Dominic Oliver

Modelling the prodrome to severe mental disorders (SMD), including unipolar mood disorders (UMD), bipolar mood disorders (BMD) and psychotic disorders (PSY), should consider both the evolution and interactions of symptoms and substance use (prodromal features) over time. Temporal network analysis can detect causal dependence between and within prodromal features by representing prodromal features as nodes, with their connections (edges) indicating the likelihood of one feature preceding the other. In SMD, node centrality could reveal insights into important prodromal features and potential intervention targets. Community analysis can identify commonly occurring feature groups to define SMD at-risk states. This retrospective (2-year) cohort study aimed to develop a global transdiagnostic SMD network of the temporal relationships between prodromal features and to examine within-group differences with sub-networks specific to UMD, BMD and PSY. Electronic health records (EHRs) from South London and Maudsley (SLaM) NHS Foundation Trust were included from 6462 individuals with SMD diagnoses (UMD:2066; BMD:740; PSY:3656). Validated natural language processing algorithms extracted the occurrence of 61 prodromal features every three months from two years to six months before SMD onset. Temporal networks of prodromal features were constructed using generalised vector autoregression panel analysis, adjusting for covariates. Edge weights (partial directed correlation coefficients, z) were reported in autocorrelative, unidirectional and bidirectional relationships. Centrality was calculated as the sum of (non-autoregressive) connections leaving (out-centrality, cout) or entering (in-centrality, cin) a node. The three sub-networks (UMD, BMD, PSY) were compared using permutation analysis, and community analysis was performed using Spinglass. The SMD network revealed strong autocorrelations (0.04 ≤ z ≤ 0.10), predominantly positive connections, and identified aggression (cout = 0.103) and tearfulness (cin = 0.134) as the most central features. Sub-networks for UMD, BMD, and PSY showed minimal differences, with 3.5% of edges differing between UMD and PSY, 0.8% between UMD and BMD, and 0.4% between BMD and PSY. Community analysis identified one positive psychotic community (delusional thinking-hallucinations-paranoia) and two behavioural communities (aggression-cannabis use-cocaine use-hostility, aggression-agitation-hostility) as the most common. This study represents the most extensive temporal network analysis conducted on the longitudinal interplay of SMD prodromal features. The findings provide further evidence to support transdiagnostic early detection services across SMD, refine assessments to detect individuals at risk and identify central features as potential intervention targets.

对包括单极情绪障碍(UMD)、双相情绪障碍(BMD)和精神障碍(PSY)在内的严重精神障碍(SMD)的前驱期进行建模,应考虑症状和物质使用(前驱期特征)随时间的演变和相互作用。时间网络分析可以通过将前驱特征表示为节点来检测前驱特征之间和内部的因果依赖性,它们的连接(边)表明一个特征先于另一个特征的可能性。在SMD中,节点中心性可以揭示重要的前驱特征和潜在的干预目标。社区分析可以识别常见的特征组,以定义SMD处于危险状态。这项回顾性(2年)队列研究旨在建立一个全球跨诊断的SMD网络,了解前驱特征之间的时间关系,并研究UMD、BMD和PSY特异性子网络的组内差异。来自南伦敦和莫兹利NHS基金会信托基金的电子健康记录(EHRs)来自6462名SMD诊断患者(UMD:2066;弹道导弹防御:740;小组:3656)。经过验证的自然语言处理算法在SMD发病前2 - 6个月每3个月提取61个前驱特征。前驱特征的时间网络使用广义向量自回归面板分析构建,调整协变量。边权(偏有向相关系数,z)具有自相关、单向和双向关系。中心性被计算为离开(外中心性,cout)或进入(中心性,cin)节点的(非自回归)连接的总和。采用排列分析比较3个子网络(UMD、BMD、PSY),并采用Spinglass进行群落分析。SMD网络表现出较强的自相关性(0.04≤z≤0.10),以正向连接为主,攻击性(cout = 0.103)和泪流满面(cin = 0.134)是最主要的特征。UMD、BMD和PSY的子网络差异很小,UMD和PSY之间的边缘差异为3.5%,UMD和BMD之间的边缘差异为0.8%,BMD和PSY之间的边缘差异为0.4%。社区分析确定了一个积极的精神病社区(妄想思维-幻觉-偏执)和两个行为社区(攻击-大麻使用-可卡因使用-敌意,攻击-激动-敌意)是最常见的。这项研究代表了对SMD前驱特征的纵向相互作用进行的最广泛的时间网络分析。研究结果为支持跨SMD的跨诊断早期检测服务提供了进一步的证据,改进了检测高危个体的评估,并确定了作为潜在干预目标的核心特征。
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引用次数: 0
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Molecular Psychiatry
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