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Chan LS, Malakhov MM, Pan W. A novel multivariable Mendelian randomization framework to disentangle highly correlated exposures with application to metabolomics. Am J Hum Genet 2024:S0002-9297(24)00251-9. [PMID: 39106865 DOI: 10.1016/j.ajhg.2024.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 07/09/2024] [Accepted: 07/09/2024] [Indexed: 08/09/2024] Open
Abstract
Mendelian randomization (MR) utilizes genome-wide association study (GWAS) summary data to infer causal relationships between exposures and outcomes, offering a valuable tool for identifying disease risk factors. Multivariable MR (MVMR) estimates the direct effects of multiple exposures on an outcome. This study tackles the issue of highly correlated exposures commonly observed in metabolomic data, a situation where existing MVMR methods often face reduced statistical power due to multicollinearity. We propose a robust extension of the MVMR framework that leverages constrained maximum likelihood (cML) and employs a Bayesian approach for identifying independent clusters of exposure signals. Applying our method to the UK Biobank metabolomic data for the largest Alzheimer disease (AD) cohort through a two-sample MR approach, we identified two independent signal clusters for AD: glutamine and lipids, with posterior inclusion probabilities (PIPs) of 95.0% and 81.5%, respectively. Our findings corroborate the hypothesized roles of glutamate and lipids in AD, providing quantitative support for their potential involvement.
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Affiliation(s)
- Lap Sum Chan
- Division of Biostatistics and Health Data Science, School of Public Health, University of Minnesota, Minneapolis, MN 55414, USA
| | - Mykhaylo M Malakhov
- Division of Biostatistics and Health Data Science, School of Public Health, University of Minnesota, Minneapolis, MN 55414, USA
| | - Wei Pan
- Division of Biostatistics and Health Data Science, School of Public Health, University of Minnesota, Minneapolis, MN 55414, USA.
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2
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Gruenbaum BF, Schonwald A, Boyko M, Zlotnik A. The Role of Glutamate and Blood-Brain Barrier Disruption as a Mechanistic Link between Epilepsy and Depression. Cells 2024; 13:1228. [PMID: 39056809 PMCID: PMC11275034 DOI: 10.3390/cells13141228] [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: 06/18/2024] [Revised: 07/10/2024] [Accepted: 07/19/2024] [Indexed: 07/28/2024] Open
Abstract
Epilepsy is associated with substantial neuropsychiatric impairments that persist long after the onset of the condition, significantly impacting quality of life. The goal of this review was to uncover how the pathological consequences of epilepsy, such as excessive glutamate release and a disrupted blood-brain barrier (BBB), contribute to the emergence of neuropsychiatric disorders. We hypothesize that epilepsy induces a dysfunctional BBB through hyperexcitation, which then further amplifies post-ictal glutamate levels and, thus, triggers neurodegenerative and neuropsychiatric processes. This review identifies the determinants of glutamate concentration levels in the brain and explores potential therapeutic interventions that restore BBB integrity. Our focus on therapeutic BBB restoration is guided by the premise that it may improve glutamate regulation, consequently mitigating the neurotoxicity that contributes to the onset of neuropsychiatric symptoms.
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Affiliation(s)
- Benjamin F. Gruenbaum
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, FL 32224, USA
| | | | - Matthew Boyko
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel; (M.B.); (A.Z.)
| | - Alexander Zlotnik
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel; (M.B.); (A.Z.)
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3
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Weber CM, Moiz B, Clyne AM. Brain microvascular endothelial cell metabolism and its ties to barrier function. VITAMINS AND HORMONES 2024; 126:25-75. [PMID: 39029976 DOI: 10.1016/bs.vh.2024.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2024]
Abstract
Brain microvascular endothelial cells, which lie at the interface between blood and brain, are critical to brain energetics. These cells must precisely balance metabolizing nutrients for their own demands with transporting nutrients into the brain to sustain parenchymal cells. It is essential to understand this integrated metabolism and transport so that we can develop better diagnostics and therapeutics for neurodegenerative diseases such as Alzheimer's disease, multiple sclerosis, and traumatic brain injury. In this chapter, we first describe brain microvascular endothelial cell metabolism and how these cells regulate both blood flow and nutrient transport. We then explain the impact of brain microvascular endothelial cell metabolism on the integrity of the blood-brain barrier, as well as how metabolites produced by the endothelial cells impact other brain cells. We detail some ways that cell metabolism is typically measured experimentally and modeled computationally. Finally, we describe changes in brain microvascular endothelial cell metabolism in aging and neurodegenerative diseases. At the end of the chapter, we highlight areas for future research in brain microvascular endothelial cell metabolism. The goal of this chapter is to underscore the importance of nutrient metabolism and transport at the brain endothelium for cerebral health and neurovascular disease treatment.
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Affiliation(s)
- Callie M Weber
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
| | - Bilal Moiz
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
| | - Alisa Morss Clyne
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States.
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4
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Lu HJ, Guo D, Wei QQ. Potential of Neuroinflammation-Modulating Strategies in Tuberculous Meningitis: Targeting Microglia. Aging Dis 2024; 15:1255-1276. [PMID: 37196131 PMCID: PMC11081169 DOI: 10.14336/ad.2023.0311] [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: 12/09/2022] [Accepted: 03/11/2023] [Indexed: 05/19/2023] Open
Abstract
Tuberculous meningitis (TBM) is the most severe complication of tuberculosis (TB) and is associated with high rates of disability and mortality. Mycobacterium tuberculosis (M. tb), the infectious agent of TB, disseminates from the respiratory epithelium, breaks through the blood-brain barrier, and establishes a primary infection in the meninges. Microglia are the core of the immune network in the central nervous system (CNS) and interact with glial cells and neurons to fight against harmful pathogens and maintain homeostasis in the brain through pleiotropic functions. However, M. tb directly infects microglia and resides in them as the primary host for bacillus infections. Largely, microglial activation slows disease progression. The non-productive inflammatory response that initiates the secretion of pro-inflammatory cytokines and chemokines may be neurotoxic and aggravate tissue injuries based on damages caused by M. tb. Host-directed therapy (HDT) is an emerging strategy for modulating host immune responses against diverse diseases. Recent studies have shown that HDT can control neuroinflammation in TBM and act as an adjunct therapy to antibiotic treatment. In this review, we discuss the diverse roles of microglia in TBM and potential host-directed TB therapies that target microglia to treat TBM. We also discuss the limitations of applying each HDT and suggest a course of action for the near future.
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Affiliation(s)
- Huan-Jun Lu
- Institute of Special Environmental Medicine, Nantong University, Jiangsu, China
| | - Daji Guo
- Department of Neurology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qian-Qi Wei
- Department of Infectious Diseases, General Hospital of Tibet Military Command, Xizang, China
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5
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Yu T, Cui J, Chen S. Electrochemical detection of the neurotransmitter glutamate and the effect of the psychotropic drug riluzole on its oxidation response. Anal Bioanal Chem 2024; 416:1707-1716. [PMID: 38363306 DOI: 10.1007/s00216-024-05175-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/23/2024] [Accepted: 01/25/2024] [Indexed: 02/17/2024]
Abstract
Glutamate is the main excitatory neurotransmitter in the brain and plays a leading role in degenerative diseases, such as motor neuron diseases. Riluzole is a glutamate regulator and a therapeutic drug for motor neuron diseases. In this work, the interaction between glutamate and riluzole was studied using cyclic voltammetry and square-wave voltammetry at a glassy carbon electrode (GCE). It was shown that glutamate underwent a two-electron transfer reaction on the GCE surface, and the electrochemical detection limits of glutamate and riluzole were 483 μmol/L and 11.47 μmol/L, respectively. The results confirm that riluzole can promote the redox reaction of glutamate. This work highlights the significance of electrochemical technology in the sensing detection of the interaction between glutamate and related psychotropic drugs.
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Affiliation(s)
- Tao Yu
- School of Automation, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Jingjie Cui
- School of Automation, Hangzhou Dianzi University, Hangzhou, 310018, China.
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
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6
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Baek JH, Park H, Kang H, Kim R, Kang JS, Kim HJ. The Role of Glutamine Homeostasis in Emotional and Cognitive Functions. Int J Mol Sci 2024; 25:1302. [PMID: 38279303 PMCID: PMC10816396 DOI: 10.3390/ijms25021302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024] Open
Abstract
Glutamine (Gln), a non-essential amino acid, is synthesized de novo by glutamine synthetase (GS) in various organs. In the brain, GS is exclusively expressed in astrocytes under normal physiological conditions, producing Gln that takes part in glutamatergic neurotransmission through the glutamate (Glu)-Gln cycle. Because the Glu-Gln cycle and glutamatergic neurotransmission play a pivotal role in normal brain activity, maintaining Gln homeostasis in the brain is crucial. Recent findings indicated that a neuronal Gln deficiency in the medial prefrontal cortex in rodents led to depressive behaviors and mild cognitive impairment along with lower glutamatergic neurotransmission. In addition, exogenous Gln supplementation has been tested for its ability to overcome neuronal Gln deficiency and reverse abnormal behaviors induced by chronic immobilization stress (CIS). Although evidence is accumulating as to how Gln supplementation contributes to normalizing glutamatergic neurotransmission and the Glu-Gln cycle, there are few reviews on this. In this review, we summarize recent evidence demonstrating that Gln supplementation ameliorates CIS-induced deleterious changes, including an imbalance of the Glu-Gln cycle, suggesting that Gln homeostasis is important for emotional and cognitive functions. This is the first review of detailed mechanistic studies on the effects of Gln supplementation on emotional and cognitive functions.
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Affiliation(s)
| | | | | | | | | | - Hyun Joon Kim
- Department of Anatomy and Convergence Medical Sciences, College of Medicine, Institute of Medical Science, Tyrosine Peptide Multiuse Research Group, Anti-Aging Bio Cell Factory Regional Leading Research Center, Gyeongsang National University, 15 Jinju-daero 816 Beongil, Jinju 52727, Gyeongnam, Republic of Korea; (J.H.B.); (H.P.); (H.K.); (R.K.); (J.S.K.)
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7
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El-Ansary A, Al-Ayadhi L. Effects of Walnut and Pumpkin on Selective Neurophenotypes of Autism Spectrum Disorders: A Case Study. Nutrients 2023; 15:4564. [PMID: 37960217 PMCID: PMC10647375 DOI: 10.3390/nu15214564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/23/2023] [Accepted: 10/25/2023] [Indexed: 11/15/2023] Open
Abstract
Special diets or nutritional supplements are regularly given to treat children with autism spectrum disorder (ASD). The increased consumption of particular foods has been demonstrated in numerous trials to lessen autism-related symptoms and comorbidities. A case study on a boy with moderate autism who significantly improved after three years of following a healthy diet consisting of pumpkin and walnuts was examined in this review in connection to a few different neurophenotypes of ASD. We are able to suggest that a diet high in pumpkin and walnuts was useful in improving the clinical presentation of the ASD case evaluated by reducing oxidative stress, neuroinflammation, glutamate excitotoxicity, mitochondrial dysfunction, and altered gut microbiota, all of which are etiological variables. Using illustrated figures, a full description of the ways by which a diet high in pumpkin and nuts could assist the included case is offered.
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Affiliation(s)
- Afaf El-Ansary
- Autism Center, Lotus Holistic Alternative Medical Center, Abu Dhabi P.O. Box 110281, United Arab Emirates
- Autism Research and Treatment Center, P.O. Box 2925, Riyadh 11461, Saudi Arabia;
| | - Laila Al-Ayadhi
- Autism Research and Treatment Center, P.O. Box 2925, Riyadh 11461, Saudi Arabia;
- Department of Physiology, Faculty of Medicine, King Saud University, P.O. Box 2925, Riyadh 11461, Saudi Arabia
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8
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Al-Dmour RH, Al-Tawarah NM, Mwafi N, Alkhataybeh BM, Khleifat KM, Tarawneh A, Satari AO, Alkharabsheh SM, Albustanji L. Enhancement of hippocampal-dependent spatial memory by Ashwagandha ( Withania somnifera) characterized by activation of NMDA receptors against monosodium glutamate-induced neurotoxicity in rats. Int J Neurosci 2023:1-9. [PMID: 37659008 DOI: 10.1080/00207454.2023.2255372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/17/2023] [Accepted: 08/30/2023] [Indexed: 09/05/2023]
Abstract
BACKGROUND AND AIM Monosodium glutamate (MSG) is used in food-additives, and the Food and Drug Administration has placed it under intense scrutiny following several reports that it causes glutamate neurotoxicity. Ashwagandha (ASH) roots are traditionally used for memory enhancement. This study aimed to evaluate the nootropic activity of ASH as well as its therapeutic anti-amnesic activity against MSG-induced hippocampal-dependent spatial memory impairment and hippocampal-NMDAR modulation. METHOD A total of 36 rats were divided equally into six groups (n = 6 in each group); the rats in the normal and negative groups were administered daily doses of normal saline and MSG (300 mg/kg), respectively, for 21 days. Two nootropic groups were administered ASH at 300 and 500 mg/kg o.p., respectively, for 21 days. Two other treatment groups were administered daily doses of MSG 300 mg/kg o.p. as well as 300 mg/kg and 500 mg/kg o.p. of ASH for 21 days. The rats' spatial memory was assessed for five days using the MWM. Additionally, NMDAR were measured quantitatively by immunohistochemistry. RESULTS We found that the rats in the nootropic groups showed significantly enhanced nootropic activity characterized by improved hippocampal-dependent spatial memory, as well as increases in the level of NMDAR in the Cornu Ammonis 1 region of their hippocampus. Moreover, we elucidated the therapeutic potential of ASH to protect against the depression of spatial memory caused by MSG-induced neurotoxicity. CONCLUSION Further, we elucidated a strong correlation between NMDAR-positive cells in the hippocampus and enhancement of spatial learning induced by long-term administration of ASH as well as a strong correlation between NMDAR positive cells in the hippocampus and depression of spatial learning induced by long-term administration of ASH and MSG.
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Affiliation(s)
- Rawand H Al-Dmour
- Department of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Mutah University, Al-Karak, Jordan
| | - Nafe M Al-Tawarah
- Department of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Mutah University, Al-Karak, Jordan
| | - Nesrin Mwafi
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Mutah University, Al-Karak
| | - Banan M Alkhataybeh
- Department of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Mutah University, Al-Karak, Jordan
| | - Khaled M Khleifat
- Department of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Mutah University, Al-Karak, Jordan
| | - Amjad Tarawneh
- Pediatric Department, Faculty of Medicine, Mutah University, Al-Karak, Jordan
| | - Anas O Satari
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Mutah University, Al-Karak
| | - Sahem M Alkharabsheh
- Department of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Mutah University, Al-Karak, Jordan
| | - Layla Albustanji
- Departement of Biology, Faculty of Sciences, Mutah University, Al-Karak, Jordan
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9
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Bornstein R, Mulholland MT, Sedensky M, Morgan P, Johnson SC. Glutamine metabolism in diseases associated with mitochondrial dysfunction. Mol Cell Neurosci 2023; 126:103887. [PMID: 37586651 PMCID: PMC10773532 DOI: 10.1016/j.mcn.2023.103887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 08/10/2023] [Accepted: 08/13/2023] [Indexed: 08/18/2023] Open
Abstract
Mitochondrial dysfunction can arise from genetic defects or environmental exposures and impact a wide range of biological processes. Among these are metabolic pathways involved in glutamine catabolism, anabolism, and glutamine-glutamate cycling. In recent years, altered glutamine metabolism has been found to play important roles in the pathologic consequences of mitochondrial dysfunction. Glutamine is a pleiotropic molecule, not only providing an alternate carbon source to glucose in certain conditions, but also playing unique roles in cellular communication in neurons and astrocytes. Glutamine consumption and catabolic flux can be significantly altered in settings of genetic mitochondrial defects or exposure to mitochondrial toxins, and alterations to glutamine metabolism appears to play a particularly significant role in neurodegenerative diseases. These include primary mitochondrial diseases like Leigh syndrome (subacute necrotizing encephalopathy) and MELAS (mitochondrial myopathy with encephalopathy, lactic acidosis, and stroke-like episodes), as well as complex age-related neurodegenerative disorders such as Alzheimer's and Parkinson's diseases. Pharmacologic interventions targeting glutamine metabolizing and catabolizing pathways appear to provide some benefits in cell and animal models of these diseases, indicating glutamine metabolism may be a clinically relevant target. In this review, we discuss glutamine metabolism, mitochondrial disease, the impact of mitochondrial dysfunction on glutamine metabolic processes, glutamine in neurodegeneration, and candidate targets for therapeutic intervention.
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Affiliation(s)
- Rebecca Bornstein
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, USA
| | - Michael T Mulholland
- Department of Applied Sciences, Translational Bioscience, Northumbria University, Newcastle, UK
| | - Margaret Sedensky
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, USA; Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, USA
| | - Phil Morgan
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, USA; Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, USA
| | - Simon C Johnson
- Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, USA; Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, USA; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, USA; Department of Neurology, University of Washington, Seattle, USA; Department of Applied Sciences, Translational Bioscience, Northumbria University, Newcastle, UK.
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10
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Huang Y, Wang Z, Huang ZX, Liu Z. Biomarkers and the outcomes of ischemic stroke. Front Mol Neurosci 2023; 16:1171101. [PMID: 37342100 PMCID: PMC10277488 DOI: 10.3389/fnmol.2023.1171101] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 05/16/2023] [Indexed: 06/22/2023] Open
Abstract
Biomarkers are measurable substances that could be used as objective indicators for disease diagnosis, responses to treatments, and outcomes predictions. In this review, we summarized the data on a number of important biomarkers including glutamate, S100B, glial fibrillary acidic protein, receptor for advanced glycation end-products, intercellular adhesion molecule-1, von willebrand factor, matrix metalloproteinase-9, interleukin-6, tumor necrosis factor-a, activated protein C, copeptin, neuron-specific enolase, tau protein, gamma aminobutyric acid, blood glucose, endothelial progenitor cells, and circulating CD34-positive cells that could be potentially used to indicate the disease burden and/or predict clinical outcome of ischemic stroke. We examined the relationship between specific biomarkers and disease burden and outcomes and discussed the potential mechanisms underlying the relationship. The clinical significance and implications of these biomarkers were also discussed.
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Affiliation(s)
- Ying Huang
- Department of Neurology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China
| | - Zhenzhen Wang
- Department of Neurology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China
| | - Zhi-Xin Huang
- Department of Neurology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China
| | - Zhenguo Liu
- Center for Precision Medicine and Division of Cardiovascular Medicine, Department of Medicine, University of Missouri School of Medicine, Columbia, MO, United States
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11
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Kalecký K, Bottiglieri T. Targeted metabolomic analysis in Parkinson's disease brain frontal cortex and putamen with relation to cognitive impairment. NPJ Parkinsons Dis 2023; 9:84. [PMID: 37270646 PMCID: PMC10239505 DOI: 10.1038/s41531-023-00531-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 05/22/2023] [Indexed: 06/05/2023] Open
Abstract
We performed liquid chromatography tandem mass spectrometry analysis with the targeted metabolomic kit Biocrates MxP Quant 500, in human brain cortex (Brodmann area 9) and putamen, to reveal metabolic changes characteristic of Parkinson's disease (PD) and PD-related cognitive decline. This case-control study involved 101 subjects (33 PD without dementia, 32 PD with dementia (cortex only), 36 controls). We found changes associated with PD, cognitive status, levodopa levels, and disease progression. The affected pathways include neurotransmitters, bile acids, homocysteine metabolism, amino acids, TCA cycle, polyamines, β-alanine metabolism, fatty acids, acylcarnitines, ceramides, phosphatidylcholines, and several microbiome-derived metabolites. Previously reported levodopa-related homocysteine accumulation in cortex still best explains the dementia status in PD, which can be modified by dietary supplementation. Further investigation is needed to reveal the exact mechanisms behind this pathological change.
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Affiliation(s)
- Karel Kalecký
- Institute of Biomedical Studies, Baylor University, Waco, TX, 76712, USA.
- Center of Metabolomics, Institute of Metabolic Disease, Baylor Scott & White Research Institute, Dallas, TX, 75204, USA.
| | - Teodoro Bottiglieri
- Center of Metabolomics, Institute of Metabolic Disease, Baylor Scott & White Research Institute, Dallas, TX, 75204, USA
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12
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Cember ATJ, Nanga RPR, Reddy R. Glutamate-weighted CEST (gluCEST) imaging for mapping neurometabolism: An update on the state of the art and emerging findings from in vivo applications. NMR IN BIOMEDICINE 2023; 36:e4780. [PMID: 35642353 DOI: 10.1002/nbm.4780] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 05/27/2022] [Accepted: 05/30/2022] [Indexed: 05/23/2023]
Abstract
Glutamate is the primary excitatory neurotransmitter in the mammalian central nervous system. As such, its proper regulation is essential to the healthy function of the human brain, and dysregulation of glutamate metabolism and compartmentalization underlies numerous neurological and neuropsychiatric pathologies. Glutamate-weighted chemical exchange saturation transfer (gluCEST) MRI is one of the only ways to non-invasively observe the relative concentration and spatial distribution of glutamate in the human brain. In the past 10 years, gluCEST has developed from a proof-of-concept experiment carried out in imaging phantoms and model systems to an increasingly sophisticated technique applied to reveal deviations from baseline neural metabolism in human beings, most notably in patients experiencing seizures of various origins or those on the psychosis spectrum. This article traces that progress, including in-depth discussion of the technical specifics of gluCEST and potential challenges to performing these experiments rigorously. We discuss the neurobiological context of glutamate, including the widely accepted hypotheses and models in the literature regarding its involvement in neurodegenerative diseases and other pathology. We then review the state of the art of in vivo glutamate detection by magnetic resonance imaging and the limitations on this front of in vivo MR spectroscopy. The gluCEST experiment is introduced and its advantages, challenges and limitations are thoroughly explored, beginning with the phantom experiment results demonstrated in the initial publication, through the latest approaches to correcting human brain images for B1 inhomogeneity. We then give a comprehensive overview of preclinical applications demonstrated to date, including Alzheimer's disease, Parkinson's disease, Huntington's disease, Traumatic brain injury and cancer, followed by a similar discussion of human studies. Finally, we highlight emerging applications, and discuss technical improvements on the horizon that hold promise for improving the robustness and versatility of gluCEST and its increasing presence in the arena of translational and precision medicine.
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Affiliation(s)
- Abigail T J Cember
- Center for Advanced Metabolic Imaging in Precision Medicine (CAMIPM), Department of Radiology, University of Pennsylvania
| | - Ravi Prakash Reddy Nanga
- Center for Advanced Metabolic Imaging in Precision Medicine (CAMIPM), Department of Radiology, University of Pennsylvania
| | - Ravinder Reddy
- Center for Advanced Metabolic Imaging in Precision Medicine (CAMIPM), Department of Radiology, University of Pennsylvania
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13
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Boyko M, Gruenbaum BF, Frank D, Natanel D, Negev S, Azab AN, Barsky G, Knyazer B, Kofman O, Zlotnik A. The Integrity of the Blood-Brain Barrier as a Critical Factor for Regulating Glutamate Levels in Traumatic Brain Injury. Int J Mol Sci 2023; 24:ijms24065897. [PMID: 36982969 PMCID: PMC10056818 DOI: 10.3390/ijms24065897] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/16/2023] [Accepted: 03/17/2023] [Indexed: 03/30/2023] Open
Abstract
A healthy blood-brain barrier (BBB) shields the brain from high concentrations of blood glutamate, which can cause neurotoxicity and neurodegeneration. It is believed that traumatic brain injury (TBI) causes long-term BBB disruption, subsequently increasing brain glutamate in the blood, in addition to increased glutamate resulting from the neuronal injury. Here, we investigate the relationship between blood and brain glutamate levels in the context of BBB permeability. Rats exposed to BBB disruption through an osmotic model or TBI and treated with intravenous glutamate or saline were compared to control rats with an intact BBB treated with intravenous glutamate or saline. After BBB disruption and glutamate administration, the concentrations of glutamate in the cerebrospinal fluid and blood and brain tissue were analyzed. The results showed a strong correlation between the brain and blood glutamate concentrations in the groups with BBB disruption. We conclude that a healthy BBB protects the brain from high levels of blood glutamate, and the permeability of the BBB is a vital component in regulating levels of glutamate in the brain. These findings bring a new approach to treating the consequences of TBI and other diseases where long-term disruption of the BBB is the central mechanism of their development.
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Affiliation(s)
- Matthew Boyko
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Benjamin F Gruenbaum
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Dmitry Frank
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Dmitry Natanel
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Shahar Negev
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Abed N Azab
- Department of Nursing, Recanati School for Community Health Professions, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Guy Barsky
- Department of Surgery B, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Boris Knyazer
- Department of Ophthalmology, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Ora Kofman
- Department of Psychology, Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
| | - Alexander Zlotnik
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva 84101, Israel
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Fontana IC, Souza DG, Souza DO, Gee A, Zimmer ER, Bongarzone S. A Medicinal Chemistry Perspective on Excitatory Amino Acid Transporter 2 Dysfunction in Neurodegenerative Diseases. J Med Chem 2023; 66:2330-2346. [PMID: 36787643 PMCID: PMC9969404 DOI: 10.1021/acs.jmedchem.2c01572] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The excitatory amino acid transporter 2 (EAAT2) plays a key role in the clearance and recycling of glutamate - the major excitatory neurotransmitter in the mammalian brain. EAAT2 loss/dysfunction triggers a cascade of neurodegenerative events, comprising glutamatergic excitotoxicity and neuronal death. Nevertheless, our current knowledge regarding EAAT2 in neurodegenerative diseases, such as amyotrophic lateral sclerosis (ALS) and Alzheimer's disease (AD), is restricted to post-mortem analysis of brain tissue and experimental models. Thus, detecting EAAT2 in the living human brain might be crucial to improve diagnosis/therapy for ALS and AD. This perspective article describes the role of EAAT2 in physio/pathological processes and provides a structure-activity relationship of EAAT2-binders, bringing two perspectives: therapy (activators) and diagnosis (molecular imaging tools).
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Affiliation(s)
- Igor C Fontana
- School of Biomedical Engineering and Imaging Sciences, St Thomas' Hospital, King's College London, London SE1 7EH, United Kingdom.,Graduate Program in Biological Sciences: Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, 90035-003 Porto Alegre, Brazil.,Division of Clinical Geriatrics, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Blickagången 16 - Neo floor seventh, 141 83 Stockholm, Sweden
| | - Débora G Souza
- Graduate Program in Biological Sciences: Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, 90035-003 Porto Alegre, Brazil.,Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681 Porto Alegre, Brazil
| | - Diogo O Souza
- Graduate Program in Biological Sciences: Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, 90035-003 Porto Alegre, Brazil.,Department of Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, 90035-003 Porto Alegre, Brazil
| | - Antony Gee
- School of Biomedical Engineering and Imaging Sciences, St Thomas' Hospital, King's College London, London SE1 7EH, United Kingdom
| | - Eduardo R Zimmer
- Department of Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, 90035-003 Porto Alegre, Brazil.,Department of Pharmacology, Universidade Federal do Rio Grande do Sul, Av. Sarmento Leite 500, sala, 90035-003 Porto Alegre, Brazil.,Graduate Program in Biological Sciences: Biochemistry (PPGBioq), and Pharmacology and Therapeutics (PPGFT), Universidade Federal do Rio Grande do Sul, Av. Sarmento Leite 500, sala, 305 Porto Alegre, Brazil.,Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681 Porto Alegre, Brazil.,McGill University Research Centre for Studies in Aging, McGill University, Montreal, Quebec H4H 1R3, Canada
| | - Salvatore Bongarzone
- School of Biomedical Engineering and Imaging Sciences, St Thomas' Hospital, King's College London, London SE1 7EH, United Kingdom
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15
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Sarlo GL, Kao A, Holton KF. Investigation of the low glutamate diet as an adjunct treatment for pediatric epilepsy: A pilot randomized controlled trial. Seizure 2023; 106:138-147. [PMID: 36867910 DOI: 10.1016/j.seizure.2023.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/13/2023] [Accepted: 02/15/2023] [Indexed: 02/22/2023] Open
Abstract
INTRODUCTION Current dietary therapies for epilepsy have side effects and are low in nutrients, which would make an alternative dietary treatment, which addresses these issues, advantageous. One potential option is the low glutamate diet (LGD). Glutamate is implicated in seizure activity. Blood brain barrier permeability in epilepsy could enable dietary glutamate to reach the brain and contribute to ictogenesis. OBJECTIVE to assess the LGD as an adjunct treatment for pediatric epilepsy. METHODS This study was a nonblinded, parallel, randomized clinical trial. The study was conducted virtually due to COVID-19 and registered on clinicaltrials.gov (NCT04545346). Participants were eligible if they were between the ages of 2 and 21 with ≥4 seizures per month. Baseline seizures were assessed for 1-month, then participants were allocated via block randomization to the intervention month (N=18), or a wait-listed control month followed by the intervention month (N=15). Outcome measures included seizure frequency, caregiver global impression of change (CGIC), non-seizure improvements, nutrient intake, and adverse events. RESULTS Nutrient intake significantly increased during the intervention. No significant differences in seizure frequency were observed between intervention and control groups. However, efficacy was assessed at 1-month compared to the standard 3-months in diet research. Additionally, 21% of participants were observed to be clinical responders to the diet. Overall health (CGIC) significantly improved in 31%, 63% experienced ≥1 non-seizure improvements, and 53% experienced adverse events. Clinical response likelihood decreased with increasing age (0.71 [0.50-0.99], p=0.04), as did the likelihood of overall health improvement (0.71 [0.54-0.92], p=0.01). DISCUSSION This study provides preliminary support for the LGD as an adjunct treatment before epilepsy becomes drug resistant, which is in contrast to the role of current dietary therapies in drug resistant epilepsy.
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Affiliation(s)
- Gabrielle L Sarlo
- Department of Neuroscience, Behavior, Cognition and Neuroscience Program, American University, Washington DC, United States; Children's National Research Institute, Center for Neuroscience, Washington, DC, United States
| | - Amy Kao
- Division of Neurophysiology, Epilepsy, and Critical Care, Center for Neuroscience and Behavioral Medicine, Children's National Medical Center, Washington, DC, United States; Division of Neurology 2, Office of Neuroscience, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, United States
| | - Kathleen F Holton
- Department of Health Studies, American University, Washington DC, United States; Department of Neuroscience, American University, Washington DC, United States; Center for Neuroscience and Behavior, American University, Washington DC, United States.
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16
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Frank D, Gruenbaum BF, Shelef I, Zvenigorodsky V, Severynovska O, Fleidervish I, Knyazer B, Frenkel A, Zlotnik A, Kofman O, Boyko M. Blood glutamate scavenging as a novel glutamate-based therapeutic approach for post-traumatic brain injury anxiety and social impairment. Transl Psychiatry 2023; 13:41. [PMID: 36739271 PMCID: PMC9899234 DOI: 10.1038/s41398-023-02329-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 01/18/2023] [Accepted: 01/20/2023] [Indexed: 02/06/2023] Open
Abstract
Traumatic brain injury (TBI) is a serious condition that is associated with an increased risk of severe, long-term psychiatric consequences. Drugs that target the glutamatergic system have proven successful in treating both TBI and many of its psychiatric sequelae. Blood glutamate scavengers (BGS) cause a decrease in blood glutamate levels, leading to a reduction in glutamate's concentration gradient from the brain to the blood and decreased levels of brain glutamate. This study evaluated the BGS pyruvate as a treatment for TBI-related neuropsychiatric conditions in a rat model. 213 rats were divided into four groups in a 2 × 2 design: Sham or TBI rats treated with pyruvate or control treatment. Magnetic resonance imaging, neurological status, brain glutamate and blood glutamate levels were assessed following the injury. Four weeks after the start of treatment, all rats underwent behavioral tests to assess anxious behavior and social impairment (aggressive and hierarchical behavior). Rats responded positively to pyruvate in several tasks, lowering brain glutamate levels and reducing anxiety and depression, as well as modulating TBI-related changes in social behavior. Glutamate scavenging with pyruvate may be an effective therapeutic option for post-TBI behavioral changes by reducing associated elevations in brain glutamate levels.
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Affiliation(s)
- Dmitry Frank
- grid.412686.f0000 0004 0470 8989Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel
| | - Benjamin F. Gruenbaum
- grid.417467.70000 0004 0443 9942Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, FL USA
| | - Ilan Shelef
- grid.412686.f0000 0004 0470 8989Department of Radiology, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel
| | - Vladislav Zvenigorodsky
- grid.412686.f0000 0004 0470 8989Department of Radiology, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel
| | - Olena Severynovska
- Department of Biochemistry and Physiology of the Faculty of Biology and Ecology, Oles Gonchar of the Dnipro National University, Dnipro, Ukraine
| | - Ilya Fleidervish
- grid.7489.20000 0004 1937 0511Department of Physiology and Cell Biology, Faculty of Health Sciences and Zlotowski Center for Neuroscience, Ben–Gurion University of the Negev, Beer-Sheva, 84105 Israel
| | - Boris Knyazer
- grid.7489.20000 0004 1937 0511Department of Ophthalmology, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Amit Frenkel
- grid.412686.f0000 0004 0470 8989Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel
| | - Alexander Zlotnik
- grid.412686.f0000 0004 0470 8989Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel
| | - Ora Kofman
- grid.7489.20000 0004 1937 0511Psychology Department, Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, POB 653, Beer-Sheva, 84105 Israel
| | - Matthew Boyko
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva, Israel.
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17
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Galineau L, Arlicot N, Dupont AC, Briend F, Houy-Durand E, Tauber C, Gomot M, Gissot V, Barantin L, Lefevre A, Vercouillie J, Roussel C, Roux S, Nadal L, Mavel S, Laumonnier F, Belzung C, Chalon S, Emond P, Santiago-Ribeiro MJ, Bonnet-Brilhault F. Glutamatergic synapse in autism: a complex story for a complex disorder. Mol Psychiatry 2023; 28:801-809. [PMID: 36434055 DOI: 10.1038/s41380-022-01860-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/12/2022] [Accepted: 10/28/2022] [Indexed: 11/27/2022]
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder whose pathophysiological mechanisms are still unclear. Hypotheses suggest a role for glutamate dysfunctions in ASD development, but clinical studies investigating brain and peripheral glutamate levels showed heterogenous results leading to hypo- and hyper-glutamatergic hypotheses of ASD. Recently, studies proposed the implication of elevated mGluR5 densities in brain areas in the pathophysiology of ASD. Thus, our objective was to characterize glutamate dysfunctions in adult subjects with ASD by quantifying (1) glutamate levels in the cingulate cortex and periphery using proton magnetic resonance spectroscopy and metabolomics, and (2) mGluR5 brain density in this population and in a validated animal model of ASD (prenatal exposure to valproate) at developmental stages corresponding to childhood and adolescence in humans using positron emission tomography. No modifications in cingulate Glu levels were observed between individuals with ASD and controls further supporting the difficulty to evaluate modifications in excitatory transmission using spectroscopy in this population, and the complexity of its glutamate-related changes. Our imaging results showed an overall increased density in mGluR5 in adults with ASD, that was only observed mostly subcortically in adolescent male rats prenatally exposed to valproic acid, and not detected in the stage corresponding to childhood in the same animals. This suggest that clinical changes in mGluR5 density could reflect the adaptation of the glutamatergic dysfunctions occurring earlier rather than being key to the pathophysiology of ASD.
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Affiliation(s)
| | - Nicolas Arlicot
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Unité de Radiopharmacie, CHRU de Tours, Tours, France
| | - Anne-Claire Dupont
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Unité de Radiopharmacie, CHRU de Tours, Tours, France.,Service de Médecine Nucléaire, CHRU de Tours, Tours, France
| | - Frederic Briend
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Excellence Center for Autism and Neurodevelopmental Disorders, CHRU de Tours, Tours, France
| | - Emmanuelle Houy-Durand
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Excellence Center for Autism and Neurodevelopmental Disorders, CHRU de Tours, Tours, France
| | - Clovis Tauber
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Marie Gomot
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Excellence Center for Autism and Neurodevelopmental Disorders, CHRU de Tours, Tours, France
| | | | | | - Antoine Lefevre
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | | | - Sylvie Roux
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Excellence Center for Autism and Neurodevelopmental Disorders, CHRU de Tours, Tours, France
| | - Lydie Nadal
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Sylvie Mavel
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | | | - Sylvie Chalon
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Patrick Emond
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Maria-Joao Santiago-Ribeiro
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Service de Médecine Nucléaire, CHRU de Tours, Tours, France
| | - Frédérique Bonnet-Brilhault
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France. .,Excellence Center for Autism and Neurodevelopmental Disorders, CHRU de Tours, Tours, France.
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18
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Cuellar-Santoyo AO, Ruiz-Rodríguez VM, Mares-Barbosa TB, Patrón-Soberano A, Howe AG, Portales-Pérez DP, Miquelajáuregui Graf A, Estrada-Sánchez AM. Revealing the contribution of astrocytes to glutamatergic neuronal transmission. Front Cell Neurosci 2023; 16:1037641. [PMID: 36744061 PMCID: PMC9893894 DOI: 10.3389/fncel.2022.1037641] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 12/20/2022] [Indexed: 01/20/2023] Open
Abstract
Research on glutamatergic neurotransmission has focused mainly on the function of presynaptic and postsynaptic neurons, leaving astrocytes with a secondary role only to ensure successful neurotransmission. However, recent evidence indicates that astrocytes contribute actively and even regulate neuronal transmission at different levels. This review establishes a framework by comparing glutamatergic components between neurons and astrocytes to examine how astrocytes modulate or otherwise influence neuronal transmission. We have included the most recent findings about the role of astrocytes in neurotransmission, allowing us to understand the complex network of neuron-astrocyte interactions. However, despite the knowledge of synaptic modulation by astrocytes, their contribution to specific physiological and pathological conditions remains to be elucidated. A full understanding of the astrocyte's role in neuronal processing could open fruitful new frontiers in the development of therapeutic applications.
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Affiliation(s)
- Ares Orlando Cuellar-Santoyo
- División de Biología Molecular, Laboratorio de Neurobiología, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico
| | - Victor Manuel Ruiz-Rodríguez
- División de Biología Molecular, Laboratorio de Neurobiología, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico
| | - Teresa Belem Mares-Barbosa
- División de Biología Molecular, Laboratorio de Neurobiología, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico,Translational and Molecular Medicine Laboratory, Research Center for Health Sciences and Biomedicine, Autonomous University of San Luis Potosí, San Luis Potosí, Mexico
| | - Araceli Patrón-Soberano
- División de Biología Molecular, Laboratorio de Neurobiología, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico
| | - Andrew G. Howe
- Intelligent Systems Laboratory, HRL Laboratories, LLC, Malibu, CA, United States
| | - Diana Patricia Portales-Pérez
- Translational and Molecular Medicine Laboratory, Research Center for Health Sciences and Biomedicine, Autonomous University of San Luis Potosí, San Luis Potosí, Mexico
| | | | - Ana María Estrada-Sánchez
- División de Biología Molecular, Laboratorio de Neurobiología, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico,*Correspondence: Ana María Estrada-Sánchez
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19
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Staruschenko A, Ma R, Palygin O, Dryer SE. Ion channels and channelopathies in glomeruli. Physiol Rev 2023; 103:787-854. [PMID: 36007181 PMCID: PMC9662803 DOI: 10.1152/physrev.00013.2022] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 08/15/2022] [Accepted: 08/21/2022] [Indexed: 11/22/2022] Open
Abstract
An essential step in renal function entails the formation of an ultrafiltrate that is delivered to the renal tubules for subsequent processing. This process, known as glomerular filtration, is controlled by intrinsic regulatory systems and by paracrine, neuronal, and endocrine signals that converge onto glomerular cells. In addition, the characteristics of glomerular fluid flow, such as the glomerular filtration rate and the glomerular filtration fraction, play an important role in determining blood flow to the rest of the kidney. Consequently, disease processes that initially affect glomeruli are the most likely to lead to end-stage kidney failure. The cells that comprise the glomerular filter, especially podocytes and mesangial cells, express many different types of ion channels that regulate intrinsic aspects of cell function and cellular responses to the local environment, such as changes in glomerular capillary pressure. Dysregulation of glomerular ion channels, such as changes in TRPC6, can lead to devastating glomerular diseases, and a number of channels, including TRPC6, TRPC5, and various ionotropic receptors, are promising targets for drug development. This review discusses glomerular structure and glomerular disease processes. It also describes the types of plasma membrane ion channels that have been identified in glomerular cells, the physiological and pathophysiological contexts in which they operate, and the pathways by which they are regulated and dysregulated. The contributions of these channels to glomerular disease processes, such as focal segmental glomerulosclerosis (FSGS) and diabetic nephropathy, as well as the development of drugs that target these channels are also discussed.
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Affiliation(s)
- Alexander Staruschenko
- Department of Molecular Pharmacology and Physiology, University of South Florida, Tampa, Florida
- Hypertension and Kidney Research Center, University of South Florida, Tampa, Florida
- James A. Haley Veterans Hospital, Tampa, Florida
| | - Rong Ma
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas
| | - Oleg Palygin
- Division of Nephrology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Stuart E Dryer
- Department of Biology and Biochemistry, University of Houston, Houston, Texas
- Department of Biomedical Sciences, Tilman J. Fertitta Family College of Medicine, University of Houston, Houston, Texas
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20
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Lai Y, Dhingra R, Zhang Z, Ball LM, Zylka MJ, Lu K. Toward Elucidating the Human Gut Microbiota-Brain Axis: Molecules, Biochemistry, and Implications for Health and Diseases. Biochemistry 2022; 61:2806-2821. [PMID: 34910469 PMCID: PMC10857864 DOI: 10.1021/acs.biochem.1c00656] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In recent years, a substantial amount of data have supported an active role of gut microbiota in mediating mammalian brain function and health. Mining gut microbiota and their metabolites for neuroprotection is enticing but requires that the fundamental biochemical details underlying such microbiota-brain crosstalk be deciphered. While a neuronal gut-brain axis (through the vagus nerve) is not disputable, accumulating studies also point to a humoral route (via blood/lymphatic circulation) by which innumerable microbial molecular cues translocate from local gut epithelia to circulation with potentials to further cross the blood-brain barrier and reach the brain. In this Perspective, we review a realm of gut microbial molecules to evaluate their fate, function, and neuroactivities in vivo as mediated by microbiota. We turn to seminal studies of neurophysiology and neurologic disease models for the elucidation of biochemical pathways that link microbiota to gut-brain signaling. In addition, we discuss opportunities and challenges for advancing the microbiota-brain axis field while calling for high-throughput discovery of microbial molecules and studies for resolving the interspecies, interorgan, and interclass interaction among these neuroactive microbial molecules.
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Affiliation(s)
- Yunjia Lai
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Campus Box 7431, Chapel Hill, North Carolina 27599, United States
| | - Radhika Dhingra
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Campus Box 7431, Chapel Hill, North Carolina 27599, United States
- Institute of Environmental Health Solutions, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Zhenfa Zhang
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Campus Box 7431, Chapel Hill, North Carolina 27599, United States
| | - Louise M Ball
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Campus Box 7431, Chapel Hill, North Carolina 27599, United States
| | - Mark J Zylka
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Carrboro, North Carolina 27510, United States
- Department of Cell and Molecular Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Kun Lu
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Campus Box 7431, Chapel Hill, North Carolina 27599, United States
- Curriculum in Toxicology and Environmental Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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21
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Zhang Y, Ngo D, Yu B, Shah NA, Chen H, Ramos AR, Zee PC, Tracy R, Durda P, Kaplan R, Daviglus ML, Rich SS, Rotter JI, Cai J, Clish C, Gerszten R, Kristal BS, Gharib SA, Redline S, Sofer T. Development and validation of a metabolite index for obstructive sleep apnea across race/ethnicities. Sci Rep 2022; 12:21805. [PMID: 36526671 PMCID: PMC9758170 DOI: 10.1038/s41598-022-26321-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
Obstructive sleep apnea (OSA) is a common disorder characterized by recurrent episodes of upper airway obstruction during sleep resulting in oxygen desaturation and sleep fragmentation, and associated with increased risk of adverse health outcomes. Metabolites are being increasingly used for biomarker discovery and evaluation of disease processes and progression. Studying metabolomic associations with OSA in a diverse community-based cohort may provide insights into the pathophysiology of OSA. We aimed to develop and replicate a metabolite index for OSA and identify individual metabolites associated with OSA. We studied 219 metabolites and their associations with the apnea hypopnea index (AHI) and with moderate-severe OSA (AHI ≥ 15) in the Hispanic Community Health Study/Study of Latinos (HCHS/SOL) (n = 3507) using two methods: (1) association analysis of individual metabolites, and (2) least absolute shrinkage and selection operator (LASSO) regression to identify a subset of metabolites jointly associated with OSA, which was used to develop a metabolite index for OSA. Results were validated in the Multi-Ethnic Study of Atherosclerosis (MESA) (n = 475). When assessing the associations with individual metabolites, we identified seven metabolites significantly positively associated with OSA in HCHS/SOL (FDR p < 0.05), of which four associations-glutamate, oleoyl-linoleoyl-glycerol (18:1/18:2), linoleoyl-linoleoyl-glycerol (18:2/18:2) and phenylalanine, were replicated in MESA (one sided-p < 0.05). The OSA metabolite index, composed of 14 metabolites, was associated with a 50% increased risk for moderate-severe OSA (OR = 1.50 [95% CI 1.21-1.85] per 1 SD of OSA metabolite index, p < 0.001) in HCHS/SOL and 55% increased risk (OR = 1.55 [95% CI 1.10-2.20] per 1 SD of OSA metabolite index, p = 0.013) in MESA, both adjusted for demographics, lifestyle, and comorbidities. Similar albeit less significant associations were observed for AHI. Replication of the metabolite index in an independent multi-ethnic dataset demonstrates the robustness of metabolomic-based OSA index to population heterogeneity. Replicated metabolite associations may provide insights into OSA-related molecular and metabolic mechanisms.
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Affiliation(s)
- Ying Zhang
- Division of Sleep Medicine and Circadian Disorders, Department of Medicine, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Debby Ngo
- Division of Pulmonary, Critical Care and Sleep Medicine, Beth Israel Deaconess Medical Center, Cardiovascular Institute, Boston, MA, 02215, USA
| | - Bing Yu
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, Human Genetics Center, The University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| | - Neomi A Shah
- Department of Medicine, Albert Einstein College of Medicine, New York, NY, 10029, USA
| | - Han Chen
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, Human Genetics Center, The University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| | - Alberto R Ramos
- Sleep Medicine Program, Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Phyllis C Zee
- Division of Sleep Medicine, Department of Neurology, Northwestern University, Chicago, IL, 60611, USA
| | - Russell Tracy
- Department of Pathology Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT, 05405, USA
| | - Peter Durda
- Department of Pathology Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT, 05405, USA
| | - Robert Kaplan
- Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Martha L Daviglus
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, 60612, USA
| | - Stephen S Rich
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA, 22908, USA
| | - Jerome I Rotter
- Department of Pediatrics, The Institute for Translational Genomics and Population Sciences, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA, 90502, USA
| | - Jianwen Cai
- Department of Biostatistics, Collaborative Studies Coordinating Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Clary Clish
- Metabolite Profiling Platform, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Robert Gerszten
- Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Bruce S Kristal
- Department of Medicine, Sleep and Circadian Disorders, Harvard Medical School, Boston, MA, 02115, USA
- Department of Medicine, Division of Sleep Medicine and Circadian Disorders, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Sina A Gharib
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, WA, 98195, USA
| | - Susan Redline
- Department of Medicine, Division of Sleep Medicine and Circadian Disorders, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Tamar Sofer
- Department of Medicine, Sleep and Circadian Disorders, Harvard Medical School, Boston, MA, 02115, USA.
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA.
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22
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Depciuch J, Jakubczyk P, Paja W, Sarzyński J, Pancerz K, Açıkel Elmas M, Keskinöz E, Bingöl Özakpınar Ö, Arbak S, Özgün G, Altuntaş S, Guleken Z. Apocynin reduces cytotoxic effects of monosodium glutamate in the brain: A spectroscopic, oxidative load, and machine learning study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 279:121495. [PMID: 35700610 DOI: 10.1016/j.saa.2022.121495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 06/02/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
Herein, we examined the modulatory effects ofApocynum (APO) on Monosodium Glutamate (MSG)-induced oxidative damage on the brain tissue of rats after long-term consumption of blood serum components by biochemical assays, Fourier transform infrared spectroscopy(FTIR), and machine learning methods. Sprague-Dawley male rats were randomly divided into the Control, Control + APO, MSG, and MSG + APO groups (n = 8 per group). All administrations were made by oral gavage saline, MSG, or APO and they were repeated for 28 days of the experiments. Brain tissue and blood serum samples were collected and analyzed for measurement levels ofmalondialdehyde (MDA),glutathione (GSH),myeloperoxidase (MPO), superoxide dismutase (SOD) activity, and Spectroscopic analysis. After 29 days, the results were evaluated using machine learning (ML). The levels of MDA and MPO showed changes in the MSG and MSG + APO groups, respectively. Changes in the proteins and lipids were observed in the FTIR spectra of the MSG groups. Additionally, APO in these animals improved the FTIR spectra to be similar to those in the Control group. The accuracy of the FTIR results calculated by ML was 100%. The findings of this study demonstrate that Apocynin treatment protectsagainst MSG-induced oxidative damage by inhibitingreactive oxygen speciesand upregulatingantioxidant capacity, indicating its potential in alleviatingthe toxic effects of MSG.
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Affiliation(s)
- Joanna Depciuch
- Institute of Nuclear Physics Polish Academy of Science, 31-342 Krakow, Poland.
| | | | - Wiesław Paja
- Institute of Computer Science, University of Rzeszów, Poland
| | | | - Krzysztof Pancerz
- Institute of Technology and Computer Science, Academy of Zamosc, Poland
| | - Merve Açıkel Elmas
- Department of Histology and Embryology, Acibadem Mehmet Ali Aydinlar University, School of Medicine, Istanbul, Turkey
| | - Elif Keskinöz
- Department of Anatomy, Acibadem Mehmet Ali Aydinlar University, School of Medicine, Istanbul, Turkey
| | | | - Serap Arbak
- Department of Histology and Embryology, Acibadem Mehmet Ali Aydinlar University, School of Medicine, Istanbul, Turkey
| | - Gökçe Özgün
- Department of Medical Biotechnology, Health Sciences Institute, Acibadem Mehmet Ali Aydinlar University, School of Medicine, Istanbul, Turkey
| | - Sevde Altuntaş
- Tissue Engineering Department, University of Health Sciences Turkey, Istanbul 34662, Turkey; Experimental Medicine Research and Application Center, Validebag Research Park, University of Health Sciences, Istanbul 34662, Turkey
| | - Zozan Guleken
- Department of Physiology, Uskudar University, Faculty of Medicine, Istanbul, Turkey.
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23
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Miyata S. Glial functions in the blood-brain communication at the circumventricular organs. Front Neurosci 2022; 16:991779. [PMID: 36278020 PMCID: PMC9583022 DOI: 10.3389/fnins.2022.991779] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 09/20/2022] [Indexed: 11/13/2022] Open
Abstract
The circumventricular organs (CVOs) are located around the brain ventricles, lack a blood-brain barrier (BBB) and sense blood-derived molecules. This review discusses recent advances in the importance of CVO functions, especially glial cells transferring periphery inflammation signals to the brain. The CVOs show size-limited vascular permeability, allowing the passage of molecules with molecular weight <10,000. This indicates that the lack of an endothelial cell barrier does not mean the free movement of blood-derived molecules into the CVO parenchyma. Astrocytes and tanycytes constitute a dense barrier at the distal CVO subdivision, preventing the free diffusion of blood-derived molecules into neighboring brain regions. Tanycytes in the CVOs mediate communication between cerebrospinal fluid and brain parenchyma via transcytosis. Microglia and macrophages of the CVOs are essential for transmitting peripheral information to other brain regions via toll-like receptor 2 (TLR2). Inhibition of TLR2 signaling or depletion of microglia and macrophages in the brain eliminates TLR2-dependent inflammatory responses. In contrast to TLR2, astrocytes and tanycytes in the CVOs of the brain are crucial for initiating lipopolysaccharide (LPS)-induced inflammatory responses via TLR4. Depletion of microglia and macrophages augments LPS-induced fever and chronic sickness responses. Microglia and macrophages in the CVOs are continuously activated, even under normal physiological conditions, as they exhibit activated morphology and express the M1/M2 marker proteins. Moreover, the microglial proliferation occurs in various regions, such as the hypothalamus, medulla oblongata, and telencephalon, with a marked increase in the CVOs, due to low-dose LPS administration, and after high-dose LPS administration, proliferation is seen in most brain regions, except for the cerebral cortex and hippocampus. A transient increase in the microglial population is beneficial during LPS-induced inflammation for attenuating sickness response. Transient receptor potential receptor vanilloid 1 expressed in astrocytes and tanycytes of the CVOs is responsible for thermoregulation upon exposure to a warm environment less than 37°C. Alternatively, Nax expressed in astrocytes and tanycytes of the CVOs is crucial for maintaining body fluid homeostasis. Thus, recent findings indicate that glial cells in the brain CVOs are essential for initiating neuroinflammatory responses and maintaining body fluid and thermal homeostasis.
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24
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Monsour M, Garbuzova-Davis S, Borlongan CV. Patching Up the Permeability: The Role of Stem Cells in Lessening Neurovascular Damage in Amyotrophic Lateral Sclerosis. Stem Cells Transl Med 2022; 11:1196-1209. [PMID: 36181767 PMCID: PMC9801306 DOI: 10.1093/stcltm/szac072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 08/29/2022] [Indexed: 01/19/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a debilitating disease with poor prognosis. The pathophysiology of ALS is commonly debated, with theories involving inflammation, glutamate excitotoxity, oxidative stress, mitochondria malfunction, neurofilament accumulation, inadequate nutrients or growth factors, and changes in glial support predominating. These underlying pathological mechanisms, however, act together to weaken the blood brain barrier and blood spinal cord barrier, collectively considered as the blood central nervous system barrier (BCNSB). Altering the impermeability of the BCNSB impairs the neurovascular unit, or interdependent relationship between the brain and advances the concept that ALS is has a significant neurovascular component contributing to its degenerative presentation. This unique categorization of ALS opens a variety of treatment options targeting the reestablishment of BCNSB integrity. This review will critically assess the evidence implicating the significant neurovascular components of ALS pathophysiology, while also offering an in-depth discussion regarding the use of stem cells to repair these pathological changes within the neurovascular unit.
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Affiliation(s)
- Molly Monsour
- Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Svitlana Garbuzova-Davis
- Center of Excellence for Aging and Brain Repair, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Cesario V Borlongan
- Corresponding author: Cesar V. Borlongan, Center of Excellence for Aging and Brain Repair, University of South Florida Morsani College of Medicine, 12901 Bruce B Downs Boulevard, Tampa, FL 33612, USA.
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25
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Sethi B, Kumar V, Mahato K, Coulter DW, Mahato RI. Recent advances in drug delivery and targeting to the brain. J Control Release 2022; 350:668-687. [PMID: 36057395 PMCID: PMC9884093 DOI: 10.1016/j.jconrel.2022.08.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/19/2022] [Accepted: 08/26/2022] [Indexed: 02/01/2023]
Abstract
Our body keeps separating the toxic chemicals in the blood from the brain. A significant number of drugs do not enter the central nervous system (CNS) due to the blood-brain barrier (BBB). Certain diseases, such as tumor growth and stroke, are known to increase the permeability of the BBB. However, the heterogeneity of this permeation makes it difficult and unpredictable to transport drugs to the brain. In recent years, research has been directed toward increasing drug penetration inside the brain, and nanomedicine has emerged as a promising approach. Active targeting requires one or more specific ligands on the surface of nanoparticles (NPs), which brain endothelial cells (ECs) recognize, allowing controlled drug delivery compared to conventional targeting strategies. This review highlights the mechanistic insights about different cell types contributing to the development and maintenance of the BBB and summarizes the recent advancement in brain-specific NPs for different pathological conditions. Furthermore, fundamental properties of brain-targeted NPs will be discussed, and the standard lesion features classified by neurological pathology are summarized.
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Affiliation(s)
- Bharti Sethi
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha NE 68198, USA
| | - Virender Kumar
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha NE 68198, USA
| | - Kalika Mahato
- College of Medicine, University of Nebraska Medical Center, Omaha NE 68198, USA
| | - Donald W Coulter
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Ram I Mahato
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha NE 68198, USA.
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26
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Gruenbaum BF, Zlotnik A, Fleidervish I, Frenkel A, Boyko M. Glutamate Neurotoxicity and Destruction of the Blood–Brain Barrier: Key Pathways for the Development of Neuropsychiatric Consequences of TBI and Their Potential Treatment Strategies. Int J Mol Sci 2022; 23:ijms23179628. [PMID: 36077024 PMCID: PMC9456007 DOI: 10.3390/ijms23179628] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/17/2022] [Accepted: 08/22/2022] [Indexed: 11/18/2022] Open
Abstract
Traumatic brain injury (TBI) is associated with significant cognitive and psychiatric conditions. Neuropsychiatric symptoms can persist for years following brain injury, causing major disruptions in patients’ lives. In this review, we examine the role of glutamate as an aftereffect of TBI that contributes to the development of neuropsychiatric conditions. We hypothesize that TBI causes long-term blood–brain barrier (BBB) dysfunction lasting many years and even decades. We propose that dysfunction in the BBB is the central factor that modulates increased glutamate after TBI and ultimately leads to neurodegenerative processes and subsequent manifestation of neuropsychiatric conditions. Here, we have identified factors that determine the upper and lower levels of glutamate concentration in the brain after TBI. Furthermore, we consider treatments of disruptions to BBB integrity, including repairing the BBB and controlling excess glutamate, as potential therapeutic modalities for the treatment of acute and chronic neuropsychiatric conditions and symptoms. By specifically focusing on the BBB, we hypothesize that restoring BBB integrity will alleviate neurotoxicity and related neurological sequelae.
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Affiliation(s)
- Benjamin F. Gruenbaum
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Alexander Zlotnik
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva 84105, Israel
| | - Ilya Fleidervish
- Department of Physiology and Cell Biology, Faculty of Health Sciences and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Amit Frenkel
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva 84105, Israel
| | - Matthew Boyko
- Department of Anesthesiology and Critical Care, Soroka University Medical Center, Ben-Gurion of the Negev, Beer-Sheva 84105, Israel
- Correspondence:
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27
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Yin K, Wang D, Zhao H, Wang Y, Zhang Y, Liu Y, Li B, Xing M. Polystyrene microplastics up-regulates liver glutamine and glutamate synthesis and promotes autophagy-dependent ferroptosis and apoptosis in the cerebellum through the liver-brain axis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 307:119449. [PMID: 35550135 DOI: 10.1016/j.envpol.2022.119449] [Citation(s) in RCA: 70] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 05/06/2022] [Accepted: 05/07/2022] [Indexed: 05/20/2023]
Abstract
Microplastics (MPs), which are emerging environmental pollutants, remain uncertainties in their toxic mechanism. MPs have been linked to severe liver metabolic disorders and neurotoxicity, but it is still unknown whether the abnormal metabolites induced by MPs can affect brain tissue through the liver-brain axis. Exposed to MPs of chickens results in liver metabolic disorders and increased glutamine and glutamate synthesis. The relative expression of glutamine in the C group was -0.862, the L-PS group was 0.271, and the H-PS group was 0.592. The expression of tight junction proteins in the blood-brain barrier (BBB) was reduced by PS-MPs. Occludin protein expression decreased by 35.8%-41.2%. Claudin 3 decreased by 19.6%-42.3%, and ZO-1 decreased by 28.3%-44.6%. Excessive glutamine and glutamate cooperated with PS-MPs to inhibit the Nrf2-Keap1-HO-1/NQO1 signaling pathway and triggered autophagy-dependent ferroptosis and apoptosis. GPX protein expression decreased by 30.9%-38%. LC3II/LC3I increased by 54%, and Caspase 3 increased by 45%. Eventually, the number of Purkinje cells was reduced, causing neurological dysfunction. In conclusion, this study provides new insights for revealing the mechanism of nervous system damaged caused by PS-MPs exposed in chickens.
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Affiliation(s)
- Kai Yin
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Dongxu Wang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Hongjing Zhao
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Yu Wang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Yue Zhang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Yachen Liu
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Baoying Li
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China
| | - Mingwei Xing
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, 150040, Heilongjiang, PR China.
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28
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Robinson EJ, Lyne TC, Blaise BJ. Safety of general anaesthetics on the developing brain: are we there yet? BJA OPEN 2022; 2:100012. [PMID: 37588272 PMCID: PMC10430845 DOI: 10.1016/j.bjao.2022.100012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 04/11/2022] [Indexed: 08/18/2023]
Abstract
Thirty years ago, neurotoxicity induced by general anaesthetics in the developing brain of rodents was observed. In both laboratory-based and clinical studies, many conflicting results have been published over the years, with initial data confirming both histopathological and neurodevelopmental deleterious effects after exposure to general anaesthetics. In more recent years, animal studies using non-human primates and new human cohorts have identified some specific deleterious effects on neurocognition. A clearer pattern of neurotoxicity seems connected to exposure to repeated general anaesthesia. The biochemistry involved in this neurotoxicity has been explored, showing differential effects of anaesthetic drugs between the developing and developed brains. In this narrative review, we start with a comprehensive description of the initial concerning results that led to recommend that any non-essential surgery should be postponed after the age of 3 yr and that research into this subject should be stepped up. We then focus on the neurophysiology of the developing brain under general anaesthesia, explore the biochemistry of the observed neurotoxicity, before summarising the main scientific and clinical reports investigating this issue. We finally discuss the GAS trial, the importance of its results, and some potential limitations that should not undermine their clinical relevance. We finally suggest some key points that could be shared with parents, and a potential research path to investigate the biochemical effects of general anaesthesia, opening up perspectives to understand the neurocognitive effects of repetitive exposures, especially in at-risk children.
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Affiliation(s)
- Emily J. Robinson
- School of Population Health and Environmental Sciences, King's College London, London, UK
| | - Tom C. Lyne
- Center for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas' Hospital, London, UK
| | - Benjamin J. Blaise
- Center for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, St. Thomas' Hospital, London, UK
- Department of Paediatric Anaesthetics, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
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29
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Koush Y, Rothman DL, Behar KL, de Graaf RA, Hyder F. Human brain functional MRS reveals interplay of metabolites implicated in neurotransmission and neuroenergetics. J Cereb Blood Flow Metab 2022; 42:911-934. [PMID: 35078383 PMCID: PMC9125492 DOI: 10.1177/0271678x221076570] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 12/26/2021] [Accepted: 01/05/2022] [Indexed: 01/28/2023]
Abstract
While functional MRI (fMRI) localizes brain activation and deactivation, functional MRS (fMRS) provides insights into the underlying metabolic conditions. There is much interest in measuring task-induced and resting levels of metabolites implicated in neuroenergetics (e.g., lactate, glucose, or β-hydroxybutyrate (BHB)) and neurotransmission (e.g., γ-aminobutyric acid (GABA) or pooled glutamate and glutamine (Glx)). Ultra-high magnetic field (e.g., 7T) has boosted the fMRS quantification precision, reliability, and stability of spectroscopic observations using short echo-time (TE) 1H-MRS techniques. While short TE 1H-MRS lacks sensitivity and specificity for fMRS at lower magnetic fields (e.g., 3T or 4T), most of these metabolites can also be detected by J-difference editing (JDE) 1H-MRS with longer TE to filter overlapping resonances. The 1H-MRS studies show that JDE can detect GABA, Glx, lactate, and BHB at 3T, 4T and 7T. Most recently, it has also been demonstrated that JDE 1H-MRS is capable of reliable detection of metabolic changes in different brain areas at various magnetic fields. Combining fMRS measurements with fMRI is important for understanding normal brain function, but also clinically relevant for mechanisms and/or biomarkers of neurological and neuropsychiatric disorders. We provide an up-to-date overview of fMRS research in the last three decades, both in terms of applications and technological advances. Overall the emerging fMRS techniques can be expected to contribute substantially to our understanding of metabolism for brain function and dysfunction.
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Affiliation(s)
- Yury Koush
- Magnetic Resonance Research Center, Department of Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
| | - Douglas L Rothman
- Magnetic Resonance Research Center, Department of Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Kevin L Behar
- Magnetic Resonance Research Center, Department of Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
- Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Robin A de Graaf
- Magnetic Resonance Research Center, Department of Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Fahmeed Hyder
- Magnetic Resonance Research Center, Department of Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
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30
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Glutamate Efflux across the Blood–Brain Barrier: New Perspectives on the Relationship between Depression and the Glutamatergic System. Metabolites 2022; 12:metabo12050459. [PMID: 35629963 PMCID: PMC9143347 DOI: 10.3390/metabo12050459] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/11/2022] [Accepted: 05/17/2022] [Indexed: 02/04/2023] Open
Abstract
Depression is a significant cause of disability and affects millions worldwide; however, antidepressant therapies often fail or are inadequate. Current medications for treating major depressive disorder can take weeks or months to reach efficacy, have troubling side effects, and are limited in their long-term capabilities. Recent studies have identified a new set of glutamate-based approaches, such as blood glutamate scavengers, which have the potential to provide alternatives to traditional antidepressants. In this review, we hypothesize as to the involvement of the glutamate system in the development of depression. We identify the mechanisms underlying glutamate dysregulation, offering new perspectives on the therapeutic modalities of depression with a focus on its relationship to blood–brain barrier (BBB) permeability. Ultimately, we conclude that in diseases with impaired BBB permeability, such as depression following stroke or traumatic brain injury, or in neurogenerative diseases, the glutamate system should be considered as a pathway to treatment. We propose that drugs such as blood glutamate scavengers should be further studied for treatment of these conditions.
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31
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Pardridge WM. Blood-brain barrier delivery for lysosomal storage disorders with IgG-lysosomal enzyme fusion proteins. Adv Drug Deliv Rev 2022; 184:114234. [PMID: 35307484 DOI: 10.1016/j.addr.2022.114234] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 02/25/2022] [Accepted: 03/14/2022] [Indexed: 12/12/2022]
Abstract
The majority of lysosomal storage diseases affect the brain. Treatment of the brain with intravenous enzyme replacement therapy is not successful, because the recombinant lysosomal enzymes do not cross the blood-brain barrier (BBB). Biologic drugs, including lysosomal enzymes, can be re-engineered for BBB delivery as IgG-enzyme fusion proteins. The IgG domain of the fusion protein is a monoclonal antibody directed against an endogenous receptor-mediated transporter at the BBB, such as the insulin receptor or the transferrin receptor. This receptor transports the IgG across the BBB, in parallel with the endogenous receptor ligand, and the IgG acts as a molecular Trojan horse to ferry into brain the lysosomal enzyme genetically fused to the IgG. The IgG-enzyme fusion protein is bi-functional and retains both high affinity binding for the BBB receptor, and high lysosomal enzyme activity. IgG-lysosomal enzymes are presently in clinical trials for treatment of the brain in Mucopolysaccharidosis.
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32
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Kaplan-Arabaci O, Acari A, Ciftci P, Gozuacik D. Glutamate Scavenging as a Neuroreparative Strategy in Ischemic Stroke. Front Pharmacol 2022; 13:866738. [PMID: 35401202 PMCID: PMC8984161 DOI: 10.3389/fphar.2022.866738] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/08/2022] [Indexed: 12/17/2022] Open
Abstract
Stroke is the second highest reason of death in the world and the leading cause of disability. The ischemic stroke makes up the majority of stroke cases that occur due to the blockage of blood vessels. Therapeutic applications for ischemic stroke include thrombolytic treatments that are in limited usage and only applicable to less than 10% of the total stroke patients, but there are promising new approaches. The main cause of ischemic neuronal death is glutamate excitotoxicity. There have been multiple studies focusing on neuroprotection via reduction of glutamate both in ischemic stroke and other neurodegenerative diseases that ultimately failed due to the obstacles in delivery. At that point, systemic glutamate grabbing, or scavenging is an ingenious way of decreasing glutamate levels upon ischemic stroke. The main advantage of this new therapeutic method is the scavengers working in the circulating blood so that there is no interference with the natural brain neurophysiology. In this review, we explain the molecular mechanisms of ischemic stroke, provide brief information about existing drugs and approaches, and present novel systemic glutamate scavenging methods. This review hopefully will elucidate the potential usage of the introduced therapeutic approaches in stroke patients.
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Affiliation(s)
- Oykum Kaplan-Arabaci
- Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey.,Sabancı University Nanotechnology Research and Application Center (SUNUM), Istanbul, Turkey
| | - Alperen Acari
- Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey
| | - Pinar Ciftci
- Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey
| | - Devrim Gozuacik
- Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey.,Sabancı University Nanotechnology Research and Application Center (SUNUM), Istanbul, Turkey.,School of Medicine, Koç University, Istanbul, Turkey
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33
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Montanari M, Martella G, Bonsi P, Meringolo M. Autism Spectrum Disorder: Focus on Glutamatergic Neurotransmission. Int J Mol Sci 2022; 23:ijms23073861. [PMID: 35409220 PMCID: PMC8998955 DOI: 10.3390/ijms23073861] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 12/16/2022] Open
Abstract
Disturbances in the glutamatergic system have been increasingly documented in several neuropsychiatric disorders, including autism spectrum disorder (ASD). Glutamate-centered theories of ASD are based on evidence from patient samples and postmortem studies, as well as from studies documenting abnormalities in glutamatergic gene expression and metabolic pathways, including changes in the gut microbiota glutamate metabolism in patients with ASD. In addition, preclinical studies on animal models have demonstrated glutamatergic neurotransmission deficits and altered expression of glutamate synaptic proteins. At present, there are no approved glutamatergic drugs for ASD, but several ongoing clinical trials are currently focusing on evaluating in autistic patients glutamatergic pharmaceuticals already approved for other conditions. In this review, we provide an overview of the literature concerning the role of glutamatergic neurotransmission in the pathophysiology of ASD and as a potential target for novel treatments.
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Affiliation(s)
- Martina Montanari
- Laboratory of Neurophysiology and Plasticity, IRCCS Fondazione Santa Lucia, 00179 Rome, Italy; (M.M.); (G.M.)
- Department of Systems Neuroscience, University Tor Vergata, 00133 Rome, Italy
| | - Giuseppina Martella
- Laboratory of Neurophysiology and Plasticity, IRCCS Fondazione Santa Lucia, 00179 Rome, Italy; (M.M.); (G.M.)
| | - Paola Bonsi
- Laboratory of Neurophysiology and Plasticity, IRCCS Fondazione Santa Lucia, 00179 Rome, Italy; (M.M.); (G.M.)
- Correspondence: (P.B.); (M.M.)
| | - Maria Meringolo
- Laboratory of Neurophysiology and Plasticity, IRCCS Fondazione Santa Lucia, 00179 Rome, Italy; (M.M.); (G.M.)
- Correspondence: (P.B.); (M.M.)
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34
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Yu Y, Zhang B, Ji P, Zuo Z, Huang Y, Wang N, Liu C, Liu SJ, Zhao F. Changes to gut amino acid transporters and microbiome associated with increased E/I ratio in Chd8 +/- mouse model of ASD-like behavior. Nat Commun 2022; 13:1151. [PMID: 35241668 PMCID: PMC8894489 DOI: 10.1038/s41467-022-28746-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 02/08/2022] [Indexed: 12/12/2022] Open
Abstract
Autism spectrum disorder (ASD), a group of neurodevelopmental disorders characterized by social communication deficits and stereotyped behaviors, may be associated with changes to the gut microbiota. However, how gut commensal bacteria modulate brain function in ASD remains unclear. Here, we used chromodomain helicase DNA-binding protein 8 (CHD8) haploinsufficient mice as a model of ASD to elucidate the pathways through which the host and gut microbiota interact with each other. We found that increased levels of amino acid transporters in the intestines of the mouse model of ASD contribute to the high level of serum glutamine and the increased excitation/inhibition (E/I) ratio in the brain. In addition, elevated α-defensin levels in the haploinsufficient mice resulted in dysregulation of the gut microbiota characterized by a reduced abundance of Bacteroides. Furthermore, supplementation with Bacteroides uniformis improved the ASD-like behaviors and restored the E/I ratio in the brain by decreasing intestinal amino acid transport and the serum glutamine levels. Our study demonstrates associations between changes in the gut microbiota and amino acid transporters, and ASD-like behavioral and electrophysiology phenotypes, in a mouse model.
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Affiliation(s)
- You Yu
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Bing Zhang
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Peifeng Ji
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Zhenqiang Zuo
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Yongxi Huang
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Ning Wang
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Chang Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Shuang-Jiang Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Fangqing Zhao
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China.
- University of Chinese Academy of Sciences, Beijing, China.
- Key Laboratory of Systems Biology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China.
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China.
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35
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McGrath T, Baskerville R, Rogero M, Castell L. Emerging Evidence for the Widespread Role of Glutamatergic Dysfunction in Neuropsychiatric Diseases. Nutrients 2022; 14:nu14050917. [PMID: 35267893 PMCID: PMC8912368 DOI: 10.3390/nu14050917] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/06/2022] [Accepted: 02/15/2022] [Indexed: 02/04/2023] Open
Abstract
The monoamine model of depression has long formed the basis of drug development but fails to explain treatment resistance or associations with stress or inflammation. Recent animal research, clinical trials of ketamine (a glutamate receptor antagonist), neuroimaging research, and microbiome studies provide increasing evidence of glutamatergic dysfunction in depression and other disorders. Glutamatergic involvement across diverse neuropathologies including psychoses, neurodevelopmental, neurodegenerative conditions, and brain injury forms the rationale for this review. Glutamate is the brain's principal excitatory neurotransmitter (NT), a metabolic and synthesis substrate, and an immune mediator. These overlapping roles and multiple glutamate NT receptor types complicate research into glutamate neurotransmission. The glutamate microcircuit comprises excitatory glutamatergic neurons, astrocytes controlling synaptic space levels, through glutamate reuptake, and inhibitory GABA interneurons. Astroglia generate and respond to inflammatory mediators. Glutamatergic microcircuits also act at the brain/body interface via the microbiome, kynurenine pathway, and hypothalamus-pituitary-adrenal axis. Disruption of excitatory/inhibitory homeostasis causing neuro-excitotoxicity, with neuronal impairment, causes depression and cognition symptoms via limbic and prefrontal regions, respectively. Persistent dysfunction reduces neuronal plasticity and growth causing neuronal death and tissue atrophy in neurodegenerative diseases. A conceptual overview of brain glutamatergic activity and peripheral interfacing is presented, including the common mechanisms that diverse diseases share when glutamate homeostasis is disrupted.
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Affiliation(s)
- Thomas McGrath
- Green Templeton College, University of Oxford, Oxford OX2 6HG, UK; (T.M.); (L.C.)
| | - Richard Baskerville
- Faculty of Health and Life Sciences, Oxford Brookes University, Oxford OX3 0BP, UK
- Correspondence:
| | - Marcelo Rogero
- School of Public Health, University of Sao Paulo, Sao Paulo 01246-904, Brazil;
| | - Linda Castell
- Green Templeton College, University of Oxford, Oxford OX2 6HG, UK; (T.M.); (L.C.)
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36
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Banks WA, Noonan C, Rhea EM, M. Rhea E. Evidence for an alternative insulin transporter at the blood-brain barrier. AGING PATHOBIOLOGY AND THERAPEUTICS 2022; 4:100-108. [PMID: 36644126 PMCID: PMC9837797 DOI: 10.31491/apt.2022.12.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Accumulating evidence suggests there is an alternative insulin transporter besides the insulin receptor at the blood-brain barrier (BBB), responsible for shuttling insulin from the circulation into the brain. In this review, we summarize key features of the BBB and what makes it unique compared to other capillary beds; summarize what we know about insulin BBB transport; provide an extensive list of diseases, physiological states, and serum factors tested in modifying insulin BBB transport; and lastly, highlight potential alternative transport systems that may be involved in or have already been tested in mediating insulin BBB transport. Identifying the transport system for insulin at the BBB would aide in controlling central nervous system (CNS) insulin levels in multiple diseases and conditions including Alzheimer's disease (AD) and obesity, where availability of insulin to the CNS is limited.
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Affiliation(s)
- William A. Banks
- Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA 98195, USA.,Geriatric Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, WA 98108, USA
| | - Cassidy Noonan
- Research and Development, Veterans Affairs Puget Sound Health Care System, Seattle, WA 98108, USA.,University of Washington, Seattle, WA 98195, USA
| | - Elizabeth M. Rhea
- Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA 98195, USA.,Geriatric Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, WA 98108, USA.,Corresponding author: Elizabeth M. Rhea, Mailing address: 1660 S. Columbian Way, Seattle, WA 98108, USA.
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37
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Puetz LC, Delmont TO, Aizpurua O, Guo C, Zhang G, Katajamaa R, Jensen P, Gilbert MTP. Gut Microbiota Linked with Reduced Fear of Humans in Red Junglefowl Has Implications for Early Domestication. ADVANCED GENETICS (HOBOKEN, N.J.) 2021; 2:2100018. [PMID: 36619855 PMCID: PMC9744516 DOI: 10.1002/ggn2.202100018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 10/04/2021] [Indexed: 01/11/2023]
Abstract
Domestication of animals can lead to profound phenotypic modifications within short evolutionary time periods, and for many species behavioral selection is likely at the forefront of this process. Animal studies have strongly implicated that the gut microbiome plays a major role in host behavior and cognition through the microbiome-gut-brain axis. Consequently, herein, it is hypothesized that host gut microbiota may be one of the earliest phenotypes to change as wild animals were domesticated. Here, the gut microbiome community in two selected lines of red junglefowl that are selected for either high or low fear of humans up to eight generations is examined. Microbiota profiles reveal taxonomic differences in gut bacteria known to produce neuroactive compounds between the two selection lines. Gut-brain module analysis by means of genome-resolved metagenomics identifies enrichment in the microbial synthesis and degradation potential of metabolites associated with fear extinction and reduces anxiety-like behaviors in low fear fowls. In contrast, high fear fowls are enriched in gut-brain modules from the butyrate and glutamate pathways, metabolites associated with fear conditioning. Overall, the results identify differences in the composition and functional potential of the gut microbiota across selection lines that may provide insights into the mechanistic explanations of the domestication process.
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Affiliation(s)
- Lara C. Puetz
- Center for Evolutionary HologenomicsGLOBE InstituteUniversity of CopenhagenCopenhagen1353Denmark
| | - Tom O. Delmont
- Génomique MétaboliqueGenoscopeInstitut François JacobCEACNRSUniv EvryUniversité Paris‐SaclayEvry91057France
| | - Ostaizka Aizpurua
- Center for Evolutionary HologenomicsGLOBE InstituteUniversity of CopenhagenCopenhagen1353Denmark
| | - Chunxue Guo
- China National GeneBankBGI‐ShenzhenShenzhen518083China
| | - Guojie Zhang
- China National GeneBankBGI‐ShenzhenShenzhen518083China,Villum Center for Biodiversity Genomics, Section for Ecology and Evolution, Department of BiologyUniversity of CopenhagenCopenhagen2100Denmark,State Key Laboratory of Genetic Resources and EvolutionKunming Institute of ZoologyChinese Academy of SciencesKunming650223China,Center for Excellence in Animal Evolution and GeneticsChinese Academy of SciencesKunming650223China
| | - Rebecca Katajamaa
- IFM Biology, AVIAN Behaviour Genomics and Physiology GroupLinköping UniversityLinköping58330Sweden
| | - Per Jensen
- IFM Biology, AVIAN Behaviour Genomics and Physiology GroupLinköping UniversityLinköping58330Sweden
| | - M. Thomas P. Gilbert
- Center for Evolutionary HologenomicsGLOBE InstituteUniversity of CopenhagenCopenhagen1353Denmark,Department of Natural History, NTNU University MuseumNorwegian University of Science and Technology (NTNU)Trondheim7491Norway
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38
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Kumar M, Kumar A, Sindhu RK, Kushwah AS. Arbutin attenuates monosodium L-glutamate induced neurotoxicity and cognitive dysfunction in rats. Neurochem Int 2021; 151:105217. [PMID: 34710534 DOI: 10.1016/j.neuint.2021.105217] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 10/16/2021] [Accepted: 10/24/2021] [Indexed: 01/06/2023]
Abstract
Excitotoxicity, oxidative stress, and neuro-inflammation underlie the pathogenesis of neurodegenerative brain disorders. Although L-glutamate is the prime excitatory neurotransmitter involved in diverse brain functions, however, overabundance at synapse can activate cell death mechanisms. Previous studies indicate that arbutin affords relief in metabolic, cardiovascular, and gastrointestinal disorders. Recently, arbutin showed benefits in animal models of epilepsy, Parkinson's disease, and Alzheimer's disease that further expanded its therapeutic potential against brain disorders. In the present study, we aimed to evaluate the potential of arbutin against monosodium L-glutamate (MSG) neurotoxicity in rats. Wistar rats (male, 180-200 g) were administered MSG (4 mg/kg) and arbutin (50 and 100 mg/kg) intraperitoneally for 21 days. Cognitive functions were assessed using elevated plus maze and novel object recognition task. Biochemical parameters of oxidative stress, tumour necrosis factor-α (TNF-α), γ-amino butyric acid (GABA), acetylcholinesterase (AChE) activity, lactate dehydrogenase (LDH), and intracellular cation-levels (Na+, Ca2+, K+) were determined using whole brain. Administration of MSG augmented cation-levels, oxidative stress, inflammation, AChE, and LDH activities, and decreased GABA levels in the brain. Arbutin (50 and 100 mg/kg, i.p.) significantly decreased these biochemical disturbances in the brain of MSG administered rats. Behavioural results showed that MSG triggered cognitive deficits in rats that were significantly attenuated by arbutin. Histopathological findings in hippocampus and cortex revealed neuroprotective outcome of arbutin treatments against MSG. MK-801 and N(G)-nitro-L-arginine methyl ester (L-NAME) enhanced memory and neuroprotective effects in rats treated with arbutin and MSG. Arbutin may afford therapeutic advantages in neurodegenerative brain disorders by suppressing the excitotoxic pathways.
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Affiliation(s)
- Manish Kumar
- Chitkara College of Pharmacy, Chitkara University, Punjab, India; Department of Pharmacology, Swift School of Pharmacy, Ghaggar Sarai, Rajpura, Patiala, Punjab, India.
| | - Anil Kumar
- Department of Pharmacology, Swift School of Pharmacy, Ghaggar Sarai, Rajpura, Patiala, Punjab, India
| | - Rakesh K Sindhu
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Ajay Singh Kushwah
- Amar Shaheed Baba Ajit Singh Jujhar Singh Memorial College of Pharmacy, Bela, Ropar, Punjab, India
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39
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Meeder E, Matzaraki V, Vadaq N, van de Wijer L, van der Ven A, Schellekens A. Unbiased Metabolomics Links Fatty Acid Pathways to Psychiatric Symptoms in People Living with HIV. J Clin Med 2021; 10:jcm10235466. [PMID: 34884168 PMCID: PMC8658345 DOI: 10.3390/jcm10235466] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/18/2021] [Accepted: 11/19/2021] [Indexed: 12/14/2022] Open
Abstract
Psychiatric symptoms are prevalent in people living with HIV (PLWH), especially depression, anxiety, impulsivity, and substance use. Various biological mechanisms might play a role in the occurrence of psychiatric symptoms in this population. A hypothesis free, data-driven metabolomics approach can further our understanding of these mechanisms. In this study, we identified metabolic pathways associated with impulsivity, depression and substance use in 157 PLWH. First, Spearman’s rank correlations between metabolite feature intensities and psychiatric symptom levels were calculated, while controlling for age, gender and body mass index. Subsequently, a mummichog pathway analysis was performed. Finally, we analyzed which individual metabolites drove the observed effects. In our cohort of PLWH, fatty acid-related pathways were associated with both depressive as well as impulsive symptomatology. Substance use showed most extensive metabolic associations, and was positively associated with short chain fatty acids (SCFA’s), and negatively associated with glutamate levels. These findings suggest that PUFA metabolism might be associated with both internalising and externalising symptomatology in PLWH. Furthermore, glutamate and SCFA’s—microbiome derivatives with known neuroactive properties—might be involved in substance use in these patients. Future studies should explore potential causal mechanisms involved and whether these findings are HIV-specific.
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Affiliation(s)
- Elise Meeder
- Department of Psychiatry, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands;
- Nijmegen Institute for Scientist-Practitioners in Addiction (NISPA), Radboud University, 6500 HE Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behavior, Radboud University, 6525 AJ Nijmegen, The Netherlands
- Correspondence: ; Tel.: +31-648-021-927
| | - Vasiliki Matzaraki
- Department of General Internal Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands; (V.M.); (N.V.); (L.v.d.W.); (A.v.d.V.)
| | - Nadira Vadaq
- Department of General Internal Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands; (V.M.); (N.V.); (L.v.d.W.); (A.v.d.V.)
- Center for Tropical and Infectious Diseases (CENTRID), Faculty of Medicine, Diponegoro University, Dr. Kariadi Hospital, Semarang 1269, Indonesia
| | - Lisa van de Wijer
- Department of General Internal Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands; (V.M.); (N.V.); (L.v.d.W.); (A.v.d.V.)
| | - André van der Ven
- Department of General Internal Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands; (V.M.); (N.V.); (L.v.d.W.); (A.v.d.V.)
| | - Arnt Schellekens
- Department of Psychiatry, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands;
- Nijmegen Institute for Scientist-Practitioners in Addiction (NISPA), Radboud University, 6500 HE Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behavior, Radboud University, 6525 AJ Nijmegen, The Netherlands
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40
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Sorrentino S, Polini A, Arima V, Romano A, Quattrini A, Gigli G, Mozetic P, Moroni L. Neurovascular signals in amyotrophic lateral sclerosis. Curr Opin Biotechnol 2021; 74:75-83. [PMID: 34800850 DOI: 10.1016/j.copbio.2021.10.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/24/2021] [Accepted: 10/22/2021] [Indexed: 12/21/2022]
Abstract
The neurovascular system (NVS) is a complex anatomic-functional unit that synergically works to maintain organs/tissues homeostasis of the entire body. NVS alterations have recently emerged as a common distinct feature in the pathogenesis of several neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS). Despite their undeniable involvement, neurovascular signalling pathways remain still far unknown in ALS. This review underlines the importance of endothelial, mural, and fibroblast cells as novel targets for ALS investigation and identifies in the interplay between neuronal and vascular systems the way to disclose novel molecular mechanisms behind the pathogenesis of ALS.
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Affiliation(s)
- Stefano Sorrentino
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy
| | - Alessandro Polini
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy
| | - Valentina Arima
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy
| | - Alessandro Romano
- San Raffaele Hospital, Division of Neuroscience, Institute of Experimental Neurology, San Rafaele Scientifc Institute, Via Olgettina, 60, 20132, Milan, Italy
| | - Angelo Quattrini
- San Raffaele Hospital, Division of Neuroscience, Institute of Experimental Neurology, San Rafaele Scientifc Institute, Via Olgettina, 60, 20132, Milan, Italy
| | - Giuseppe Gigli
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy; Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, via Arnesano, 73100, Lecce, Italy
| | - Pamela Mozetic
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy; San Raffaele Hospital, Division of Neuroscience, Institute of Experimental Neurology, San Rafaele Scientifc Institute, Via Olgettina, 60, 20132, Milan, Italy
| | - Lorenzo Moroni
- CNR Nanotec - Institute of Nanotechnology, Campus Ecotekne, via Monteroni, Lecce, 73100, Italy; Maastricht University, MERLN Institute for Technology-Inspired Regenerative Medicine, Complex Tissue Regeneration Department, Universiteitssingel 40, 6229ER, Maastricht, The Netherlands.
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41
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Wu C, Barkova D, Komarova N, Offenhäusser A, Andrianova M, Hu Z, Kuznetsov A, Mayer D. Highly selective and sensitive detection of glutamate by an electrochemical aptasensor. Anal Bioanal Chem 2021; 414:1609-1622. [PMID: 34783880 DOI: 10.1007/s00216-021-03783-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/21/2021] [Accepted: 11/09/2021] [Indexed: 01/03/2023]
Abstract
An electrochemical aptamer-based sensor was developed for glutamate, the major excitatory neurotransmitter in the central nervous system. Determining glutamic acid release and glutamic acid levels is crucial for studying signal transmission and for diagnosing pathological conditions in the brain. Glutamic acid-selective oligonucleotides were isolated from an ssDNA library using the Capture-SELEX protocol in complex medium. The selection permitted the isolation of an aptamer 1d04 with a dissociation constant of 12 µM. The aptamer sequence was further used in the development of an electrochemical aptamer sensor. For this purpose, a truncated aptamer sequence named glu1 was labelled with a ferrocene redox tag at the 3'-end and immobilized on a gold electrode surface via Au-thiol bonds. Using 6-mercapto-1-hexanol as the backfill, the sensor performance was characterized by alternating current voltammetry. The glu1 aptasensor showed a limit of detection of 0.0013 pM, a wide detection range between 0.01 pM and 1 nM, and good selectivity for glutamate in tenfold diluted human serum. With this enzyme-free aptasensor, the highly selective and sensitive detection of glutamate was demonstrated, which possesses great potential for implementation in microelectrodes and for in vitro as well as in vivo monitoring of neurotransmitter release.
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Affiliation(s)
- Changtong Wu
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.,Faculty I, RWTH Aachen University, 52062, Aachen, Germany
| | - Daria Barkova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Natalia Komarova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Andreas Offenhäusser
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.,Faculty I, RWTH Aachen University, 52062, Aachen, Germany
| | - Mariia Andrianova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Ziheng Hu
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - Alexander Kuznetsov
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia.
| | - Dirk Mayer
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.
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42
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Salliss ME, Farland LV, Mahnert ND, Herbst-Kralovetz MM. The role of gut and genital microbiota and the estrobolome in endometriosis, infertility and chronic pelvic pain. Hum Reprod Update 2021; 28:92-131. [PMID: 34718567 DOI: 10.1093/humupd/dmab035] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 08/25/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Endometriosis is a chronic, burdensome condition that is historically understudied. Consequently, there is a lack of understanding of the etiology of the disease and its associated symptoms, including infertility and chronic pelvic pain (CPP). Endometriosis development is influenced by estrogen metabolism and inflammation, which are modulated by several factors including the microbiome and the estrobolome (the collection of genes encoding estrogen-metabolizing enzymes in the gut microbiome). Therefore, there is increasing interest in understanding the role of microbiota in endometriosis etiology. OBJECTIVE AND RATIONALE To date, there is no cure for endometriosis and treatment options often are ineffective. This manuscript will review the potential relationship between the microbiome and endometriosis, infertility and CPP and highlight the available data on the microbiome in relation to endometriosis and its related symptoms. The overarching goal of this manuscript is to inform future microbiome research that will lead to a deeper understanding of the etiology of the disease and possible diagnostic modalities and treatments. The potential impact of the microbiome on estrogen regulation modulated by the estrobolome, as well as inflammation and other endometriosis-promoting mechanisms within the genital tract, will be reviewed. The methodological limitations of microbiome-related studies will be critically assessed to provide improved guidelines for future microbiome and clinical studies. SEARCH METHODS PubMed databases were searched using the following keywords: endometriosis AND microbiome, infertility AND microbiome, pelvic pain AND microbiome, IVF (in-vitro fertilization) AND microbiome, endometriosis AND infertility. Clinical and preclinical animal trials that were eligible for review, and related to microbiome and endometriosis, infertility or CPP were included. All available manuscripts were published in 2002-2021. OUTCOMES In total, 28 clinical and 6 animal studies were included in the review. In both human and animal studies, bacteria were enriched in endometriosis groups, although there was no clear consensus on specific microbiota compositions that were associated with endometriosis, and no studies included infertility or CPP with endometriosis. However, bacterial vaginosis-associated bacteria and Lactobacillus depletion in the cervicovaginal microbiome were associated with endometriosis and infertility in the majority (23/28) of studies. Interpretation of endometrial studies is limited owing to a variety of methodological factors, discussed in this review. In addition, metadata outlining antibiotic usage, age, race/ethnicity, menopausal status and timing of sample collection in relation to diagnosis of endometriosis was not consistently reported. Animal studies (6/6) support a bidirectional relationship between the gut microbiota and endometriosis onset and progression. WIDER IMPLICATIONS There is evidence that a dysbiotic gut or genital microbiota is associated with multiple gynecologic conditions, with mounting data supporting an association between the microbiome and endometriosis and infertility. These microbiomes likely play a role in the gut-brain axis, which further supports a putative association with the spectrum of symptoms associated with endometriosis, including infertility and CPP. Collectively, this review highlights the demand for more rigorous and transparent methodology and controls, consistency across the field, and inclusion of key demographic and clinical characteristics of disease and comparison participants. Rigorous study designs will allow for a better understanding of the potential role of the microbiome in endometriosis etiology and the relationship to other disorders of the female reproductive tract.
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Affiliation(s)
- Mary E Salliss
- Department of Obstetrics and Gynecology, University of Arizona-College of Medicine, Phoenix, AZ, USA.,Department of Biology and Biochemistry, Bath University, Bath, UK
| | - Leslie V Farland
- Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA.,Department of Obstetrics and Gynecology, University of Arizona-College of Medicine Tucson, Tucson, AZ, USA
| | - Nichole D Mahnert
- Department of Obstetrics and Gynecology, University of Arizona-College of Medicine, Phoenix, AZ, USA.,Department of Obstetrics and Gynecology, Banner-University Medical Center Phoenix, Phoenix, AZ, USA
| | - Melissa M Herbst-Kralovetz
- Department of Obstetrics and Gynecology, University of Arizona-College of Medicine, Phoenix, AZ, USA.,Department of Basic Medical Sciences, University of Arizona-College of Medicine, Phoenix, AZ, USA
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43
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Sowers JL, Sowers ML, Shavkunov AS, Hawkins BE, Wu P, DeWitt DS, Prough DS, Zhang K. Traumatic brain injury induces region-specific glutamate metabolism changes as measured by multiple mass spectrometry methods. iScience 2021; 24:103108. [PMID: 34622161 PMCID: PMC8479783 DOI: 10.1016/j.isci.2021.103108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 06/14/2021] [Accepted: 09/08/2021] [Indexed: 11/02/2022] Open
Abstract
The release of excess glutamate following traumatic brain injury (TBI) results in glutamate excitotoxicity and metabolic energy failure. Endogenous mechanisms for reducing glutamate concentration in the brain parenchyma following TBI are poorly understood. Using multiple mass spectrometry approaches, we examined TBI-induced changes to glutamate metabolism. We present evidence that glutamate concentration can be reduced by glutamate oxidation via a "truncated" tricarboxylic acid cycle coupled to the urea cycle. This process reduces glutamate levels, generates carbon for energy metabolism, leads to citrulline accumulation, and produces nitric oxide. Several key metabolites are identified by metabolomics in support of this mechanism and the locations of these metabolites in the injured hemisphere are demonstrated by MALDI-MS imaging. The results of this study establish the advantages of multiple mass spectrometry approaches and provide insights into glutamate metabolism following TBI that could lead to improved treatment approaches.
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Affiliation(s)
- James L Sowers
- MD-PhD Combined Degree Program, University of Texas Medical Branch, Galveston, TX 77555, USA.,Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Mark L Sowers
- MD-PhD Combined Degree Program, University of Texas Medical Branch, Galveston, TX 77555, USA.,Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Alexander S Shavkunov
- Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Bridget E Hawkins
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA.,Research Innovation and Scientific Excellence (RISE) Center, School of Nursing, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Ping Wu
- Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Douglas S DeWitt
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Donald S Prough
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Kangling Zhang
- Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555, USA.,The Moody Project for Translational Traumatic Brain Injury Research, University of Texas Medical Branch, Galveston, TX 77555, USA
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44
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Glutamate triggers the expression of functional ionotropic and metabotropic glutamate receptors in mast cells. Cell Mol Immunol 2021; 18:2383-2392. [PMID: 32313211 PMCID: PMC8484602 DOI: 10.1038/s41423-020-0421-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 03/16/2020] [Indexed: 02/07/2023] Open
Abstract
Mast cells are emerging as players in the communication between peripheral nerve endings and cells of the immune system. However, it is not clear the mechanism by which mast cells communicate with peripheral nerves. We previously found that mast cells located within healing tendons can express glutamate receptors, raising the possibility that mast cells may be sensitive to glutamate signaling. To evaluate this hypothesis, we stimulated primary mast cells with glutamate and showed that glutamate induced the profound upregulation of a panel of glutamate receptors of both the ionotropic type (NMDAR1, NMDAR2A, and NMDAR2B) and the metabotropic type (mGluR2 and mGluR7) at both the mRNA and protein levels. The binding of glutamate to glutamate receptors on the mast cell surface was confirmed. Further, glutamate had extensive effects on gene expression in the mast cells, including the upregulation of pro-inflammatory components such as IL-6 and CCL2. Glutamate also induced the upregulation of transcription factors, including Egr2, Egr3 and, in particular, FosB. The extensive induction of FosB was confirmed by immunofluorescence assessment. Glutamate receptor antagonists abrogated the responses of the mast cells to glutamate, supporting the supposition of a functional glutamate-glutamate receptor axis in mast cells. Finally, we provide in vivo evidence supporting a functional glutamate-glutamate receptor axis in the mast cells of injured tendons. Together, these findings establish glutamate as an effector of mast cell function, thereby introducing a novel principle for how cells in the immune system can communicate with nerve cells.
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45
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Ali HM, Hammad SF, El-Malla SF. Green spectrophotometric methods for determination of a monosodium glutamate in different matrices. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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46
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Yeon S, Kim SH, Sim J, Kim S, Lee Y, Kim H, Cha YS. Major component causing neurological toxicity in acute glufosinate ammonium poisoning: determination of glufosinate, 1-methoxy-2-propanol, and ammonia in serum and cerebrospinal fluid. Clin Toxicol (Phila) 2021; 60:286-292. [PMID: 34269144 DOI: 10.1080/15563650.2021.1952215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To determine the primary contributor to neurotoxicity in patients with glufosinate ammonium (GLA) poisoning, by quantifying glufosinate, 1-methoxy-2-propanol, and ammonia in serum and the cerebrospinal fluid (CSF). MATERIALS AND METHODS We collected and analysed data from confirmed cases of GLA poisoning between May 2018 and August 2020. Based on the occurrence of neurological complications (mental change, seizure, and central apnoea), patients were assigned to one of two groups: those with complications (NCx) and without (non-NCx) complications. Concentrations of glufosinate, 1-methoxy-2-propanol (1M2P), and ammonia were measured in the serum upon admission and during hospital stay. The concentrations of all these substances were again measured in the CSF following a decline in the mental status or seizure (NCx group) or on the day after hospitalisation (non-NCx group). RESULTS Of the 20 patients included, ammonia levels in the serum and CSF at onset of altered sensorium in the NCx group (n = 16) were significantly higher than those at one day after hospitalisation in the non-NCx group (n = 4) (p = 0.011 in serum, p = 0.047 in CSF), with its concentration in the CSF being higher than that in the serum in 15/16 cases. The concentration of 1M2P was similar in the serum and CSF (8/16), but the concentrations of glufosinate (7/16) was lower in the CSF than in the serum. In the non-NCx group (n = 4), only ammonia was detectable. CONCLUSIONS Among patients with GLA poisoning, increased CSF ammonia was significantly correlated with neurological complications.
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Affiliation(s)
- Seonghoon Yeon
- Forensic Toxicology Division, National Forensic Service, Wonju, Republic of Korea
| | - Sung Hwa Kim
- Department of Biostatistics and Center of Biomedical Data Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Juhyun Sim
- Forensic Toxicology Division, National Forensic Service, Wonju, Republic of Korea
| | - Sunchun Kim
- Forensic Toxicology Division, Daejeon institute, National Forensic Service, Daejeon, Republic of Korea
| | - Yoonsuk Lee
- Department of Emergency Medicine and Research Institute of Hyperbaric Medicine and Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Hyun Kim
- Department of Emergency Medicine and Research Institute of Hyperbaric Medicine and Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Yong Sung Cha
- Department of Emergency Medicine and Research Institute of Hyperbaric Medicine and Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
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47
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Moldovan OL, Rusu A, Tanase C, Vari CE. Glutamate - A multifaceted molecule: Endogenous neurotransmitter, controversial food additive, design compound for anti-cancer drugs. A critical appraisal. Food Chem Toxicol 2021; 153:112290. [PMID: 34023459 DOI: 10.1016/j.fct.2021.112290] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/10/2021] [Accepted: 05/14/2021] [Indexed: 12/18/2022]
Abstract
One of the most widely used flavour enhancers in the food industry is monosodium glutamate (MSG). MSG consumption has been on an upward trend, worrying in terms of potential toxic effects. This review is focused on the long-term toxicity of MSG and the experimental evidence that supports it. The article's primary purpose was to survey recently published data regarding the consumption of MSG within safe limits. The administered doses in animal models are very varied and have given rise to controversy. Also, the paper comprises pathways to lower MSG toxicity and highlight other underexploited biological effects, as anti-cancer potential. The administration of MSG, combined with various compounds, has been shown benefit against toxic effects. Several recent studies have identified a possible mechanism that recommends MSG and some derivatives as potential anti-cancer agents. New anti-cancer compounds based on the glutamic acid structure must be studied and further exploited. International regulations require harmonization of safe doses of MSG based on current scientific studies. Replacing MSG with other umami flavour enhancers may be a safer alternative for human health in the future. The biological consequences of MSG consumption or therapeutical administration have not been fully deciphered yet.
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Affiliation(s)
- Octavia-Laura Moldovan
- Medicine and Pharmacy Doctoral School, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Târgu Mureș, 540142, Târgu Mureș, Romania.
| | - Aura Rusu
- Pharmaceutical and Therapeutic Chemistry Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Târgu Mureș, 540142, Târgu Mureș, Romania.
| | - Corneliu Tanase
- Pharmaceutical Botany Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Târgu Mureș, 540142, Târgu Mureș, Romania.
| | - Camil-Eugen Vari
- Pharmacy and Clinical Pharmacy Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Târgu Mureș, 540142, Târgu Mureș, Romania.
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48
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Alcoreza OB, Patel DC, Tewari BP, Sontheimer H. Dysregulation of Ambient Glutamate and Glutamate Receptors in Epilepsy: An Astrocytic Perspective. Front Neurol 2021; 12:652159. [PMID: 33828523 PMCID: PMC8019783 DOI: 10.3389/fneur.2021.652159] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/24/2021] [Indexed: 12/16/2022] Open
Abstract
Given the important functions that glutamate serves in excitatory neurotransmission, understanding the regulation of glutamate in physiological and pathological states is critical to devising novel therapies to treat epilepsy. Exclusive expression of pyruvate carboxylase and glutamine synthetase in astrocytes positions astrocytes as essential regulators of glutamate in the central nervous system (CNS). Additionally, astrocytes can significantly alter the volume of the extracellular space (ECS) in the CNS due to their expression of the bi-directional water channel, aquaporin-4, which are enriched at perivascular endfeet. Rapid ECS shrinkage has been observed following epileptiform activity and can inherently concentrate ions and neurotransmitters including glutamate. This review highlights our emerging knowledge on the various potential contributions of astrocytes to epilepsy, particularly supporting the notion that astrocytes may be involved in seizure initiation via failure of homeostatic responses that lead to increased ambient glutamate. We also review the mechanisms whereby ambient glutamate can influence neuronal excitability, including via generation of the glutamate receptor subunit GluN2B-mediated slow inward currents, as well as indirectly affect neuronal excitability via actions on metabotropic glutamate receptors that can potentiate GluN2B currents and influence neuronal glutamate release probabilities. Additionally, we discuss evidence for upregulation of System x c - , a cystine/glutamate antiporter expressed on astrocytes, in epileptic tissue and changes in expression patterns of glutamate receptors.
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Affiliation(s)
- Oscar B Alcoreza
- Glial Biology in Health, Disease, and Cancer Center, Fralin Biomedical Research Institute, Virginia Tech Carilion, Roanoke, VA, United States.,School of Medicine, Virginia Tech Carilion, Roanoke, VA, United States.,Translational Biology, Medicine and Health, Virginia Tech, Blacksburg, VA, United States
| | - Dipan C Patel
- Glial Biology in Health, Disease, and Cancer Center, Fralin Biomedical Research Institute, Virginia Tech Carilion, Roanoke, VA, United States
| | - Bhanu P Tewari
- Glial Biology in Health, Disease, and Cancer Center, Fralin Biomedical Research Institute, Virginia Tech Carilion, Roanoke, VA, United States
| | - Harald Sontheimer
- Glial Biology in Health, Disease, and Cancer Center, Fralin Biomedical Research Institute, Virginia Tech Carilion, Roanoke, VA, United States
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49
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Delbridge ARD, Huh D, Brickelmaier M, Burns JC, Roberts C, Challa R, Raymond N, Cullen P, Carlile TM, Ennis KA, Liu M, Sun C, Allaire NE, Foos M, Tsai HH, Franchimont N, Ransohoff RM, Butts C, Mingueneau M. Organotypic Brain Slice Culture Microglia Exhibit Molecular Similarity to Acutely-Isolated Adult Microglia and Provide a Platform to Study Neuroinflammation. Front Cell Neurosci 2020; 14:592005. [PMID: 33473245 PMCID: PMC7812919 DOI: 10.3389/fncel.2020.592005] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 11/24/2020] [Indexed: 12/14/2022] Open
Abstract
Microglia are central nervous system (CNS) resident immune cells that have been implicated in neuroinflammatory pathogenesis of a variety of neurological conditions. Their manifold context-dependent contributions to neuroinflammation are only beginning to be elucidated, which can be attributed in part to the challenges of studying microglia in vivo and the lack of tractable in vitro systems to study microglia function. Organotypic brain slice cultures offer a tissue-relevant context that enables the study of CNS resident cells and the analysis of brain slice microglial phenotypes has provided important insights, in particular into neuroprotective functions. Here we use RNA sequencing, direct digital quantification of gene expression with nCounter® technology and targeted analysis of individual microglial signature genes, to characterize brain slice microglia relative to acutely-isolated counterparts and 2-dimensional (2D) primary microglia cultures, a widely used in vitro surrogate. Analysis using single cell and population-based methods found brain slice microglia exhibited better preservation of canonical microglia markers and overall gene expression with stronger fidelity to acutely-isolated adult microglia, relative to in vitro cells. We characterized the dynamic phenotypic changes of brain slice microglia over time, after plating in culture. Mechanical damage associated with slice preparation prompted an initial period of inflammation, which resolved over time. Based on flow cytometry and gene expression profiling we identified the 2-week timepoint as optimal for investigation of microglia responses to exogenously-applied stimuli as exemplified by treatment-induced neuroinflammatory changes observed in microglia following LPS, TNF and GM-CSF addition to the culture medium. Altogether these findings indicate that brain slice cultures provide an experimental system superior to in vitro culture of microglia as a surrogate to investigate microglia functions, and the impact of soluble factors and cellular context on their physiology.
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Affiliation(s)
- Alex R D Delbridge
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States.,Biogen Postdoctoral Scientist Program, Biogen, Cambridge, MA, United States
| | - Dann Huh
- Translational Biology, Biogen, Cambridge, MA, United States
| | - Margot Brickelmaier
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
| | - Jeremy C Burns
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
| | - Chris Roberts
- Translational Biology, Biogen, Cambridge, MA, United States
| | - Ravi Challa
- Translational Biology, Biogen, Cambridge, MA, United States
| | - Naideline Raymond
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
| | - Patrick Cullen
- Translational Biology, Biogen, Cambridge, MA, United States
| | | | - Katelin A Ennis
- Genetic and Neurodevelopmental Disorders, Biogen, Cambridge, MA, United States
| | - Mei Liu
- Biogen Postdoctoral Scientist Program, Biogen, Cambridge, MA, United States
| | - Chao Sun
- Biogen Postdoctoral Scientist Program, Biogen, Cambridge, MA, United States
| | - Normand E Allaire
- Biogen Postdoctoral Scientist Program, Biogen, Cambridge, MA, United States
| | - Marianna Foos
- Biogen Postdoctoral Scientist Program, Biogen, Cambridge, MA, United States
| | - Hui-Hsin Tsai
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
| | | | - Richard M Ransohoff
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
| | - Cherie Butts
- Digital & Quantitative Medicine, Biogen, Cambridge, MA, United States
| | - Michael Mingueneau
- Multiple Sclerosis and Neuroimmunology Research Unit, Biogen, Cambridge, MA, United States
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50
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Fuchsberger T, Yuste R, Martinez-Bellver S, Blanco-Gandia MC, Torres-Cuevas I, Blasco-Serra A, Arango R, Miñarro J, Rodríguez-Arias M, Teruel-Marti V, Lloret A, Viña J. Oral Monosodium Glutamate Administration Causes Early Onset of Alzheimer's Disease-Like Pathophysiology in APP/PS1 Mice. J Alzheimers Dis 2020; 72:957-975. [PMID: 31658055 DOI: 10.3233/jad-190274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Glutamate excitotoxicity has long been related to Alzheimer's disease (AD) pathophysiology, and it has been shown to affect the major AD-related hallmarks, amyloid-β peptide (Aβ) accumulation and tau phosphorylation (p-tau). We investigated whether oral administration of monosodium glutamate (MSG) has effects in a murine model of AD, the double transgenic mice APP/PS1. We found that AD pathogenic factors appear earlier in APP/PS1 when supplemented with MSG, while wildtype mice were essentially not affected. Aβ and p-tau levels were increased in the hippocampus in young APP/PS1 animals upon MSG administration. This was correlated with increased Cdk5-p25 levels. Furthermore, in these mice, we observed a decrease in the AMPA receptor subunit GluA1 and they had impaired long-term potentiation. The Hebb-Williams Maze revealed that they had memory deficits. We show here for the first time that oral MSG supplementation can accelerate AD-like pathophysiology in a mouse model of AD.
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Affiliation(s)
- Tanja Fuchsberger
- Department of Physiology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | - Raquel Yuste
- Department of Physiology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | - Sergio Martinez-Bellver
- Department of Anatomy and Human Embriology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | | | | | - Arantxa Blasco-Serra
- Department of Anatomy and Human Embriology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | - Román Arango
- Department of Anatomy and Human Embriology, Faculty of Medicine, Universitat de València, Valencia, Spain.,Department of Computer Science, School of Engineering ETSE, Universitat de València, Burjassot, Spain
| | - Jose Miñarro
- Department of Psychobiology, Faculty of Psycology, Universitat de València, Valencia, Spain
| | - Marta Rodríguez-Arias
- Department of Psychobiology, Faculty of Psycology, Universitat de València, Valencia, Spain
| | - Vicent Teruel-Marti
- Department of Anatomy and Human Embriology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | - Ana Lloret
- Department of Physiology, Faculty of Medicine, Universitat de València, Valencia, Spain
| | - Jose Viña
- Department of Physiology, Faculty of Medicine, Universitat de València, Valencia, Spain
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