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Rantala MJ, Luoto S, Borráz-León JI, Krams I. Schizophrenia: the new etiological synthesis. Neurosci Biobehav Rev 2022; 142:104894. [PMID: 36181926 DOI: 10.1016/j.neubiorev.2022.104894] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 08/25/2022] [Accepted: 09/25/2022] [Indexed: 10/31/2022]
Abstract
Schizophrenia has been an evolutionary paradox: it has high heritability, but it is associated with decreased reproductive success. The causal genetic variants underlying schizophrenia are thought to be under weak negative selection. To unravel this paradox, many evolutionary explanations have been suggested for schizophrenia. We critically discuss the constellation of evolutionary hypotheses for schizophrenia, highlighting the lack of empirical support for most existing evolutionary hypotheses-with the exception of the relatively well supported evolutionary mismatch hypothesis. It posits that evolutionarily novel features of contemporary environments, such as chronic stress, low-grade systemic inflammation, and gut dysbiosis, increase susceptibility to schizophrenia. Environmental factors such as microbial infections (e.g., Toxoplasma gondii) can better predict the onset of schizophrenia than polygenic risk scores. However, researchers have not been able to explain why only a small minority of infected people develop schizophrenia. The new etiological synthesis of schizophrenia indicates that an interaction between host genotype, microbe infection, and chronic stress causes schizophrenia, with neuroinflammation and gut dysbiosis mediating this etiological pathway. Instead of just alleviating symptoms with drugs, the parasite x genotype x stress model emphasizes that schizophrenia treatment should focus on detecting and treating possible underlying microbial infection(s), neuroinflammation, gut dysbiosis, and chronic stress.
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Affiliation(s)
- Markus J Rantala
- Department of Biology, University of Turku, FIN-20014 Turku, Finland.
| | - Severi Luoto
- School of Population Health, University of Auckland, 1023 Auckland, New Zealand
| | | | - Indrikis Krams
- Institute of Ecology and Earth Sciences, University of Tartu, 51014 Tartu, Estonia; Department of Zoology and Animal Ecology, Faculty of Biology, University of Latvia, 1004, Rīga, Latvia
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Nonmedical Interventions for Schizophrenia: A Review of Diet, Exercise, and Social Roles. Holist Nurs Pract 2020; 34:73-82. [PMID: 32049694 DOI: 10.1097/hnp.0000000000000369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Schizophrenia is a major mental illness with a disease course that is influenced by lifestyle. The risk-benefit ratio for alternative interventions is more favorable than for antipsychotics in long-term treatment. Dietary interventions may target autoimmune features, vitamin or mineral deficiencies, abnormal lipid metabolism, gluten sensitivity, or others. Examples of interventions involving diet, physical activity, or physical processes or social interventions including talk therapy exist in the literature. Notwithstanding, the general utility of these types of interventions remains inconclusive, awaiting long-term randomized trials. A perspective that separates the cause of the disease from its symptoms may be helpful in treatment planning and is warranted to distinguish between short-term and long-term recovery goals.
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Genes dysregulated in the blood of people with Williams syndrome are enriched in protein-coding genes positively selected in humans. Eur J Med Genet 2020; 63:103828. [DOI: 10.1016/j.ejmg.2019.103828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/09/2019] [Accepted: 12/21/2019] [Indexed: 12/29/2022]
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TOKER OS. Porphyridum Cruentum as a natural colorant in chewing gum. FOOD SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1590/fst.41817] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Verde A, Sierra M, Alarcón L, Pedroni V, Appignanesi G, Morini M. Experimental and computational studies of the effects of free DHA on a model phosphatidylcholine membrane. Chem Phys Lipids 2018; 217:12-18. [DOI: 10.1016/j.chemphyslip.2018.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/01/2018] [Accepted: 10/15/2018] [Indexed: 02/09/2023]
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6
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Tyurina YY, Shrivastava I, Tyurin VA, Mao G, Dar HH, Watkins S, Epperly M, Bahar I, Shvedova AA, Pitt B, Wenzel SE, Mallampalli RK, Sadovsky Y, Gabrilovich D, Greenberger JS, Bayır H, Kagan VE. "Only a Life Lived for Others Is Worth Living": Redox Signaling by Oxygenated Phospholipids in Cell Fate Decisions. Antioxid Redox Signal 2018; 29:1333-1358. [PMID: 28835115 PMCID: PMC6157439 DOI: 10.1089/ars.2017.7124] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 08/10/2017] [Accepted: 08/18/2017] [Indexed: 12/19/2022]
Abstract
SIGNIFICANCE Oxygenated polyunsaturated lipids are known to play multi-functional roles as essential signals coordinating metabolism and physiology. Among them are well-studied eicosanoids and docosanoids that are generated via phospholipase A2 hydrolysis of membrane phospholipids and subsequent oxygenation of free polyunsaturated fatty acids (PUFA) by cyclooxygenases and lipoxygenases. Recent Advances: There is an emerging understanding that oxygenated PUFA-phospholipids also represent a rich signaling language with yet-to-be-deciphered details of the execution machinery-oxygenating enzymes, regulators, and receptors. Both free and esterified oxygenated PUFA signals are generated in cells, and their cross-talk and inter-conversion through the de-acylation/re-acylation reactions is not sufficiently explored. CRITICAL ISSUES Here, we review recent data related to oxygenated phospholipids as important damage signals that trigger programmed cell death pathways to eliminate irreparably injured cells and preserve the health of multicellular environments. We discuss the mechanisms underlying the trans-membrane redistribution and generation of oxygenated cardiolipins in mitochondria by cytochrome c as pro-apoptotic signals. We also consider the role of oxygenated phosphatidylethanolamines as proximate pro-ferroptotic signals. FUTURE DIRECTIONS We highlight the importance of sequential processes of phospholipid oxygenation and signaling in disease contexts as opportunities to use their regulatory mechanisms for the identification of new therapeutic targets.
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Affiliation(s)
- Yulia Y. Tyurina
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Indira Shrivastava
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Vladimir A. Tyurin
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Gaowei Mao
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Haider H. Dar
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Simon Watkins
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Michael Epperly
- Radiation Oncology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ivet Bahar
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Anna A. Shvedova
- Exposure Assessment Branch/NIOSH/CDC, West Virginia University, Morgantown, West Virginia
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia
| | - Bruce Pitt
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Sally E. Wenzel
- Department of Medicine, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Asthma Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rama K. Mallampalli
- Department of Medicine, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Yoel Sadovsky
- Magee Women's Research Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | | | - Hülya Bayır
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Valerian E. Kagan
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
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7
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Flynn KR, Martin LL, Ackland ML, Torriero AAJ. Real-Time Quartz Crystal Microbalance Monitoring of Free Docosahexaenoic Acid Interactions with Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11717-11727. [PMID: 27728769 DOI: 10.1021/acs.langmuir.6b01984] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Docosahexaenoic acid (DHA) is the most abundant polyunsaturated omega-3 fatty acid found in mammalian neuronal cell membranes. Although DHA is known to be important for neuronal cell survival, little is know about how DHA interacts with phospholipid bilayers. This study presents a detailed quartz crystal microbalance with dissipation monitoring (QCM-D) analysis of free DHA interactions with individual and mixed phospholipid supported lipid bilayers (SLB). DHA incorporation and subsequent changes to the SLBs viscoelastic properties were observed to be concentration-dependent, influenced by the phospholipid species, the headgroup charge, and the presence or absence of calcium ions. It was observed that 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) SLBs incorporated the greatest amount of DHA concentration, whereas the presence of phospholipids, phosphatidylserine (PS), and phosphatidylinositol (PI) in a POPC SLB significantly reduced DHA incorporation and changed the SLBs physicochemical properties. These observations are hypothesized to be due to a substitution event occurring between DHA and phospholipid species. PS domain formation in POPC/PS 8:2 SLBs was observed in the presence of calcium ions, which favored DHA incorporation to a similar level as for a POPC only SLB. The changes in SLB thickness observed with different DHA concentrations are also presented. This work contributes to an understanding of the physical changes induced in a lipid bilayer as a consequence of its exposure to different DHA concentrations (from 50 to 200 μM). The capacity of DHA to influence the physical properties of SLBs indicates the potential for dietary DHA supplementation to cause changes in cellular membranes in vivo, with subsequent physiological consequences for cell function.
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Affiliation(s)
- Kiera R Flynn
- Centre for Cellular and Molecular Biology, School of Life and Environmental Sciences, Deakin University , Melbourne, Australia
| | - Lisandra L Martin
- School of Chemistry, Monash University , Clayton 3800, Victoria, Australia
| | - M Leigh Ackland
- Centre for Cellular and Molecular Biology, School of Life and Environmental Sciences, Deakin University , Melbourne, Australia
| | - Angel A J Torriero
- Centre for Chemistry and Biotechnology, School of Life and Environmental Sciences, Deakin University , Burwood, Victoria 3125, Australia
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8
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Gomez A, Rothman JM, Petrzelkova K, Yeoman CJ, Vlckova K, Umaña JD, Carr M, Modry D, Todd A, Torralba M, Nelson KE, Stumpf RM, Wilson BA, Blekhman R, White BA, Leigh SR. Temporal variation selects for diet-microbe co-metabolic traits in the gut of Gorilla spp. THE ISME JOURNAL 2016; 10:514-26. [PMID: 26315972 PMCID: PMC4737941 DOI: 10.1038/ismej.2015.146] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 07/07/2015] [Accepted: 07/14/2015] [Indexed: 11/09/2022]
Abstract
Although the critical role that our gastrointestinal microbes play in host physiology is now well established, we know little about the factors that influenced the evolution of primate gut microbiomes. To further understand current gut microbiome configurations and diet-microbe co-metabolic fingerprints in primates, from an evolutionary perspective, we characterized fecal bacterial communities and metabolomic profiles in 228 fecal samples of lowland and mountain gorillas (G. g. gorilla and G. b. beringei, respectively), our closest evolutionary relatives after chimpanzees. Our results demonstrate that the gut microbiomes and metabolomes of these two species exhibit significantly different patterns. This is supported by increased abundance of metabolites and bacterial taxa associated with fiber metabolism in mountain gorillas, and enrichment of markers associated with simple sugar, lipid and sterol turnover in the lowland species. However, longitudinal sampling shows that both species' microbiomes and metabolomes converge when hosts face similar dietary constraints, associated with low fruit availability in their habitats. By showing differences and convergence of diet-microbe co-metabolic fingerprints in two geographically isolated primate species, under specific dietary stimuli, we suggest that dietary constraints triggered during their adaptive radiation were potential factors behind the species-specific microbiome patterns observed in primates today.
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Affiliation(s)
- Andres Gomez
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Animal Sciences, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - Jessica M Rothman
- Department of Anthropology, Hunter College of CUNY, New York, NY, USA
- New York Consortium in Evolutionary Primatology (NYCEP), New York, NY, USA
| | - Klara Petrzelkova
- Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Brno, Czech Republic
- Biology Centre, Institute of Parasitology, Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic
- Liberec Zoo, Liberec, Czech Republic
| | - Carl J Yeoman
- Department of Animal and Range Sciences, Montana State University, Bozeman, MT, USA
| | - Klara Vlckova
- Department of Pathology and Parasitology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
| | - Juan D Umaña
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - Monica Carr
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - David Modry
- Biology Centre, Institute of Parasitology, Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic
- Department of Pathology and Parasitology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic
- CEITEC, Central European Institute for Technology, Brno, Czech Republic
| | - Angelique Todd
- World Wildlife Fund, Dzanga-Sangha Protected Areas, Bayanga, Central African Republic
| | | | | | - Rebecca M Stumpf
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Anthropology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - Brenda A Wilson
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Microbiology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - Ran Blekhman
- Department of Genetics, Cell Biology and Development, University of Minnesota Twin Cities, St Paul, MN, USA
- Department of Ecology, Evolution and Behavior, University of Minnesota Twin Cities, St Paul, MN, USA
| | - Bryan A White
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Animal Sciences, University of Illinois at Urbana–Champaign, Champaign, IL, USA
| | - Steven R Leigh
- Department of Animal Sciences, Institute for Genomic Biology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Anthropology, University of Illinois at Urbana–Champaign, Champaign, IL, USA
- Department of Anthropology, University of Colorado, Boulder, CO, USA
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9
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Gomez A, Petrzelkova K, Yeoman CJ, Vlckova K, Mrázek J, Koppova I, Carbonero F, Ulanov A, Modry D, Todd A, Torralba M, Nelson KE, Gaskins HR, Wilson B, Stumpf RM, White BA, Leigh SR. Gut microbiome composition and metabolomic profiles of wild western lowland gorillas (Gorilla gorilla gorilla) reflect host ecology. Mol Ecol 2015; 24:2551-65. [DOI: 10.1111/mec.13181] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 03/23/2015] [Indexed: 01/04/2023]
Affiliation(s)
- Andres Gomez
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Animal Sciences; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
| | - Klara Petrzelkova
- Institute of Vertebrate Biology; Academy of Sciences of the Czech Republic; Brno Czech Republic
- Department of Pathology and Parasitology; Faculty of Veterinary Medicine; University of Veterinary and Pharmaceutical Sciences; Brno Czech Republic
- Institute of Parasitology; Biology Center of the Academy of Sciences of the Czech Republic; České Budějovice Czech Republic
- Liberec Zoo; Liberec Czech Republic
| | - Carl J. Yeoman
- Department of Animal and Range Sciences; Montana State University; Bozeman MT 59717 USA
| | - Klara Vlckova
- Department of Pathology and Parasitology; Faculty of Veterinary Medicine; University of Veterinary and Pharmaceutical Sciences; Brno Czech Republic
| | - Jakub Mrázek
- Institute of Animal Physiology and Genetics; Academy of Sciences of the Czech Republic; Prague Czech Republic
| | - Ingrid Koppova
- Institute of Animal Physiology and Genetics; Academy of Sciences of the Czech Republic; Prague Czech Republic
| | - Franck Carbonero
- Department of Food Science; University of Arkansas; Fayetteville AR 72704 USA
| | - Alexander Ulanov
- Metabolomics Center; Roy J. Carver Biotechnology Center; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
| | - David Modry
- Institute of Parasitology; Biology Center of the Academy of Sciences of the Czech Republic; České Budějovice Czech Republic
- CEITEC; Central European Institute for Technology; Brno Czech Republic
| | - Angelique Todd
- World Wildlife Fund; Dzanga-Sangha Protected Areas; Bayanga Central African Republic
| | | | | | - H. Rex Gaskins
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Animal Sciences; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
| | - Brenda Wilson
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Microbiology; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
| | - Rebecca M. Stumpf
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Anthropology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
| | - Bryan A. White
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Animal Sciences; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
| | - Steven R. Leigh
- Institute for Genomic Biology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Anthropology; University of Illinois at Urbana Champaign; Urbana IL 61801 USA
- Department of Anthropology; University of Colorado; Boulder CO 80309 USA
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Aripiprazole increases NAD(P)H–quinone oxidoreductase-1 and heme oxygenase-1 in PC12 cells. J Neural Transm (Vienna) 2014; 122:757-72. [DOI: 10.1007/s00702-014-1350-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 12/04/2014] [Indexed: 12/30/2022]
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Matsumoto J, Kunii Y, Wada A, Mashiko H, Yabe H, Niwa SI. Mental disorders that exacerbated due to the Fukushima disaster, a complex radioactive contamination disaster. Psychiatry Clin Neurosci 2014; 68:182-7. [PMID: 24895734 DOI: 10.1111/pcn.12112] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
AIM The Fukushima disaster was caused by an earthquake that occurred on 11 March 2011. Following the serious damage caused by the earthquake and the subsequent tsunami, radioactive contamination occurred because of the meltdown accident at the Fukushima nuclear power plant. We investigated what mental disorders were likely to become exacerbated under these conditions. METHODS We surveyed psychiatric outpatients at Fukushima Medical University Hospital for 1 month (31 days) from the day of the earthquake (March–April 2011). RESULTS The survey revealed that bipolar I disorder was most likely to become exacerbated under the conditions and that the exacerbation exhibited was more likely to involve manic switches than depression. CONCLUSION On the basis of the results of our study, particular care must be taken to follow up bipolar I disorder patients after a natural disaster. Our results also suggested the possible origin of bipolar I disorder.
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Affiliation(s)
- Junya Matsumoto
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
| | - Yasuto Kunii
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
| | - Akira Wada
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
| | - Hirobumi Mashiko
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
| | - Hirooki Yabe
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
| | - Shin-ichi Niwa
- Department of Neuropsychiatry; School of Medicine; Fukushima Medical University; Fukushima Japan
- Department of Psychiatry; Aizu Medical Center; Fukushima Medical University; Fukushima Japan
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12
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van Dongen J, Boomsma DI. The evolutionary paradox and the missing heritability of schizophrenia. Am J Med Genet B Neuropsychiatr Genet 2013; 162B:122-36. [PMID: 23355297 DOI: 10.1002/ajmg.b.32135] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 01/04/2013] [Indexed: 12/11/2022]
Abstract
Schizophrenia is one of the most detrimental common psychiatric disorders, occurring at a prevalence of approximately 1%, and characterized by increased mortality and reduced reproduction, especially in men. The heritability has been estimated around 70% and the genome-wide association meta-analyses conducted by the Psychiatric Genomics Consortium have been successful at identifying an increasing number of risk loci. Various theories have been proposed to explain why genetic variants that predispose to schizophrenia persist in the population, despite the fitness reduction in affected individuals, a question known as the evolutionary paradox. In this review, we consider evolutionary perspectives of schizophrenia and of the empirical evidence that may support these perspectives. Proposed evolutionary explanations include balancing selection, fitness trade-offs, fluctuating environments, sexual selection, mutation-selection balance and genomic conflicts. We address the expectations about the genetic architecture of schizophrenia that are predicted by different evolutionary scenarios and discuss the implications for genetic studies. Several potential sources of "missing" heritability, including gene-environment interactions, epigenetic variation, and rare genetic variation are examined from an evolutionary perspective. A better understanding of evolutionary history may provide valuable clues to the genetic architecture of schizophrenia and other psychiatric disorders, which is highly relevant to genetic studies that aim to detect genetic risk variants.
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Affiliation(s)
- Jenny van Dongen
- Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands.
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13
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Miljević Č, Nikolić-Kokić A, Nikolić M, Niketić V, Spasić MB, Lečić-Toševski D, Blagojević D. Effect of atypical antipsychotics on antioxidant enzyme activities in human erythrocytes (in vitro study). Hum Psychopharmacol 2013; 28:1-6. [PMID: 23124725 DOI: 10.1002/hup.2272] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 09/19/2012] [Accepted: 09/30/2012] [Indexed: 11/10/2022]
Abstract
OBJECTIVE This study was set out to examine the impact of atypical antipsychotic drugs: aripiprazole, clozapine, ziprasidone, olanzapine, quetiapine, sertindole and amisulpride on the activity of antioxidant defence enzymes in human erythrocytes in vitro. METHODS Cu,Zn-superoxide dismutase (SOD1), catalase (CAT), selenium-dependent glutathione peroxidase and glutathione reductase activities were determined after drugs incubation with blood of 15 apparently healthy non-smoking male volunteers (ages 23-39) for 1 h at 37 °C. RESULTS A statistically significant increase in SOD1 activity was found in samples incubated with aripiprazole (p < 0.01) and quetiapine (p < 0.05) compared with incubated control. SOD1 activity profile following native polyacrylamide gel electrophoresis indicates that aripiprazole and quetiapine protect enzyme activity from inhibition with hydrogen peroxide. Our results showed that sertindole decreases activity of CAT comparing with control non-treated erythrocytes. Moreover, in sertindole treated erythrocytes, negative correlation between SOD1 and glutathione peroxidase activities was found. Increased amount of hydrogen peroxide in such situation may leave erythrocytes and transform their role in circulation from anti-oxidative to pro-oxidative. CONCLUSIONS Our results indicate that mechanism through sertindole could express its in vivo toxic effects and point toward possible (neuro)protective effects of aripiprazole and quetiapine.
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Affiliation(s)
- Čedo Miljević
- Institute of Mental Health, School of Medicine, University of Belgrade, Belgrade, Serbia
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14
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Moser AB, Steinberg SJ, Watkins PA, Moser HW, Ramaswamy K, Siegmund KD, Lee DR, Ely JJ, Ryder OA, Hacia JG. Human and great ape red blood cells differ in plasmalogen levels and composition. Lipids Health Dis 2011; 10:101. [PMID: 21679470 PMCID: PMC3129581 DOI: 10.1186/1476-511x-10-101] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 06/17/2011] [Indexed: 02/06/2023] Open
Abstract
Background Plasmalogens are ether phospholipids required for normal mammalian developmental, physiological, and cognitive functions. They have been proposed to act as membrane antioxidants and reservoirs of polyunsaturated fatty acids as well as influence intracellular signaling and membrane dynamics. Plasmalogens are particularly enriched in cells and tissues of the human nervous, immune, and cardiovascular systems. Humans with severely reduced plasmalogen levels have reduced life spans, abnormal neurological development, skeletal dysplasia, impaired respiration, and cataracts. Plasmalogen deficiency is also found in the brain tissue of individuals with Alzheimer disease. Results In a human and great ape cohort, we measured the red blood cell (RBC) levels of the most abundant types of plasmalogens. Total RBC plasmalogen levels were lower in humans than bonobos, chimpanzees, and gorillas, but higher than orangutans. There were especially pronounced cross-species differences in the levels of plasmalogens with a C16:0 moiety at the sn-1 position. Humans on Western or vegan diets had comparable total RBC plasmalogen levels, but the latter group showed moderately higher levels of plasmalogens with a C18:1 moiety at the sn-1 position. We did not find robust sex-specific differences in human or chimpanzee RBC plasmalogen levels or composition. Furthermore, human and great ape skin fibroblasts showed only modest differences in peroxisomal plasmalogen biosynthetic activity. Human and chimpanzee microarray data indicated that genes involved in plasmalogen biosynthesis show cross-species differential expression in multiple tissues. Conclusion We propose that the observed differences in human and great ape RBC plasmalogens are primarily caused by their rates of biosynthesis and/or turnover. Gene expression data raise the possibility that other human and great ape cells and tissues differ in plasmalogen levels. Based on the phenotypes of humans and rodents with plasmalogen disorders, we propose that cross-species differences in tissue plasmalogen levels could influence organ functions and processes ranging from cognition to reproduction to aging.
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Affiliation(s)
- Ann B Moser
- Hugo W. Moser Research Institute at Kennedy Krieger, and Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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15
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Watkins PA, Moser AB, Toomer CB, Steinberg SJ, Moser HW, Karaman MW, Ramaswamy K, Siegmund KD, Lee DR, Ely JJ, Ryder OA, Hacia JG. Identification of differences in human and great ape phytanic acid metabolism that could influence gene expression profiles and physiological functions. BMC PHYSIOLOGY 2010; 10:19. [PMID: 20932325 PMCID: PMC2964658 DOI: 10.1186/1472-6793-10-19] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Accepted: 10/08/2010] [Indexed: 02/11/2023]
Abstract
Background It has been proposed that anatomical differences in human and great ape guts arose in response to species-specific diets and energy demands. To investigate functional genomic consequences of these differences, we compared their physiological levels of phytanic acid, a branched chain fatty acid that can be derived from the microbial degradation of chlorophyll in ruminant guts. Humans who accumulate large stores of phytanic acid commonly develop cerebellar ataxia, peripheral polyneuropathy, and retinitis pigmentosa in addition to other medical conditions. Furthermore, phytanic acid is an activator of the PPAR-alpha transcription factor that influences the expression of genes relevant to lipid metabolism. Results Despite their trace dietary phytanic acid intake, all great ape species had elevated red blood cell (RBC) phytanic acid levels relative to humans on diverse diets. Unlike humans, chimpanzees showed sexual dimorphism in RBC phytanic acid levels, which were higher in males relative to females. Cultured skin fibroblasts from all species had a robust capacity to degrade phytanic acid. We provide indirect evidence that great apes, in contrast to humans, derive significant amounts of phytanic acid from the hindgut fermentation of plant materials. This would represent a novel reduction of metabolic activity in humans relative to the great apes. Conclusion We identified differences in the physiological levels of phytanic acid in humans and great apes and propose this is causally related to their gut anatomies and microbiomes. Phytanic acid levels could contribute to cross-species and sex-specific differences in human and great ape transcriptomes, especially those related to lipid metabolism. Based on the medical conditions caused by phytanic acid accumulation, we suggest that differences in phytanic acid metabolism could influence the functions of human and great ape nervous, cardiovascular, and skeletal systems.
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Affiliation(s)
- Paul A Watkins
- Department ofNeurology, Johns Hopkins University School of Medicine, Hugo W Moser Research Institute at Kennedy Krieger, Baltimore, MD 21205, USA
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16
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Venkatasubramanian G, Arasappa R, Rao NP, Behere RV, Kalmady S, Gangadhar BN. Inverse relationship between serum high density lipoprotein and negative syndrome in antipsychotic-naive schizophrenia. Clin Chem Lab Med 2010; 48:95-8. [PMID: 19929755 DOI: 10.1515/cclm.2010.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Recent literature suggests a role for apolipoprotein L (apoL) aberrations in the pathogenesis of schizophrenia. ApoL is almost exclusively associated with apolipoprotein A-I in high-density lipoproteins (HDLs). The objective of this study was to examine the correlation between symptom scores and serum HDL in antipsychotic-naive schizophrenia patients. METHODS In this cross-sectional study, 60 antipsychotic-naive schizophrenia patients were systematically examined for their symptom scores, with good inter-rater reliability. Concurrently, an overnight fasting serum lipid profile from these patients was assessed. RESULTS Serum HDL had a significant inverse correlation with a total negative syndrome score (rho=-0.43; p=0.001). CONCLUSIONS The study observation supports the potential role for HDL abnormalities in the genesis of negative symptoms in schizophrenia.
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Affiliation(s)
- Ganesan Venkatasubramanian
- The Metabolic Clinic in Psychiatry, Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India.
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18
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Erren TC, Cullen P, Erren M. Neanderthal, chimp and human genomes: hypotheses wanted for research into brain evolution. Med Hypotheses 2007; 70:4-7. [PMID: 17651909 DOI: 10.1016/j.mehy.2007.05.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Accepted: 05/23/2007] [Indexed: 11/20/2022]
Abstract
The recent sequencing of Neanderthal DNA and the release of drafts of human and chimp genomes in 2001 and 2005, respectively, provide an opportunity to better understand why our brain is different from those of extinct and living relatives. However, it is not clear that hypothesis-free analysis of genetic differences alone will shed light on the complex "big bang" evolution of human brains that is thought to have taken place about 100,000 years ago. Rather than pursuing black box genomics, we suggest that genetic analyses should be guided by hypotheses. One plausible candidate in this regard is the"fat-utilization" hypothesis proposed by the late David Horrobin.
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Affiliation(s)
- Stanley J. Ulijaszek
- Institute of Social and Cultural Anthropology, University of Oxford, Oxford OX2 6PF, United Kingdom; ,
| | - Hayley Lofink
- Institute of Social and Cultural Anthropology, University of Oxford, Oxford OX2 6PF, United Kingdom; ,
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20
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O'Connell MJ, McInerney JO. Adaptive evolution of the human fatty acid synthase gene: support for the cancer selection and fat utilization hypotheses? Gene 2005; 360:151-9. [PMID: 16154299 DOI: 10.1016/j.gene.2005.06.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Revised: 02/15/2005] [Accepted: 06/02/2005] [Indexed: 11/21/2022]
Abstract
Cancer may act as the etiological agent for natural selection in some genes. This selective pressure would act to reduce the success of neoplastic lineages over normal cell lineages in individuals of reproductive age. In addition, human's relatively larger brain and longer lifespan may have also acted as a selective force requiring new genotypes. One of the most important proteins in both processes is the fatty acid synthase (FAS) gene involved in fatty acid biosynthesis. A variety of other proteins, including PTEN, MAPK1, SREBP1, SREBP2 and PI are also involved in the regulation of fatty acid biosynthesis. We have specifically analysed variability in selective pressure across all these genes in human, mouse and other vertebrates. We have found that the FAS gene alone has signatures indicative of adaptive evolution. We did not find any signatures of adaptive evolution in any of the other proteins. In the FAS gene, we have detected an excess of non-synonymous over synonymous substitutions in approximately 6% of sites in the human lineage. Contrastingly, the substitution process at these sites in other available vertebrates and mammals indicates strong purifying selection. This is likely to reflect a functional shift in human FAS and correlates well with previously observed changes in FAS biochemical activities. We speculate that the role played by FAS either in cancer development or in human brain development has created this selective pressure, although we cannot rule out the various other functions of FAS.
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Affiliation(s)
- Mary J O'Connell
- Bioinformatics and Molecular Evolution Laboratory, School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland
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21
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Wilson DR. Schizophrenia as one extreme of a sexually selected fitness indicator. Schizophr Res 2004; 70:111-4. [PMID: 15246470 DOI: 10.1016/j.schres.2003.10.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2003] [Revised: 09/28/2003] [Accepted: 10/28/2003] [Indexed: 10/26/2022]
Affiliation(s)
- Daniel R Wilson
- Department of Psychiatry, Creighton University Medical Center, 3528 Dodge Street, Omaha, NE 68131, USA.
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22
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Erren TC, Erren M. Can fat explain the human brain's big bang evolution?-Horrobin's leads for comparative and functional genomics. Prostaglandins Leukot Essent Fatty Acids 2004; 70:345-7. [PMID: 15041025 DOI: 10.1016/j.plefa.2003.12.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
When David Horrobin suggested that phospholipid and fatty acid metabolism played a major role in human evolution, his 'fat utilization hypothesis' unified intriguing work from paleoanthropology, evolutionary biology, genetic and nervous system research in a novel and coherent lipid-related context. Interestingly, unlike most other evolutionary concepts, the hypothesis allows specific predictions which can be empirically tested in the near future. This paper summarizes some of Horrobin's intriguing propositions and suggests as to how approaches of comparative genomics published in Cell, Nature, Science and elsewhere since 1997 may be used to examine his evolutionary hypothesis. Indeed, systematic investigations of the genomic clock in the species' mitochondrial DNA, the Y and autosomal chromosomes as evidence of evolutionary relationships and distinctions can help to scrutinize associated predictions for their validity, namely that key mutations which differentiate us from Neanderthals and from great apes are in the genes coding for proteins which regulate fat metabolism, and particularly the phospholipid metabolism of the synapses of the brain. It is concluded that beyond clues to humans' relationships with living primates and to the Neanderthals' cognitive performance and their disappearance, the suggested molecular clock analyses may provide crucial insights into the biochemical evolution-and means of possible manipulation-of our brain.
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Affiliation(s)
- T C Erren
- Institute and Polyclinic for Occupational and Social Medicine, School of Medicine and Dentistry, University of Cologne, Joseph-Stelzmann-Str. 9, 50924 Köln (Lindenthal), Germany.
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Abstract
The term 'schizophrenia' refers to a group of disorders that have been described in every human culture. Two apparently well established findings have corroborated the need for an evolutionary explanation of these disorders: (1) cross-culturally stable incidence rates and (2) decreased fecundity of the affected individuals. The rationale behind this relates to the evolutionary paradox that susceptibility genes for schizophrenia are obviously preserved in the human genepool, despite fundamental reproductive disadvantages associated with the disorders. Some researchers have therefore proposed that a compensatory advantage must exist in people who are carriers of these genes or in their first-degree relatives. Such advantages were hypothesised to be outside the brain (e.g. greater resistance against toxins or infectious diseases), or within the social domain (e.g. schizotypal shamans, creativity). More specifically, T.J. Crow has suggested an evolutionary theory of schizophrenia that relates the disorders to an extreme of variation of hemispheric specialisation and the evolution of language due to a single gene mutation located on homologous regions of the sex chromosomes. None of the evolutionary scenarios does, however, fully account for the diversity of the symptomatology, nor does any one hypothesis acknowledge the objection that the mere prevalence of a disorder must not be confused with adaptation. In the present article, I therefore discuss the evolutionary hypotheses of schizophrenia, arguing that a symptom-based approach to psychotic disorders in evolutionary perspective may improve upon the existing models of schizophrenia.
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Affiliation(s)
- Martin Brüne
- Centre for Psychiatry and Psychotherapy, University of Bochum, Alexandrinenstr, Bochum, Germany.
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Sayanova OV, Napier JA. Eicosapentaenoic acid: biosynthetic routes and the potential for synthesis in transgenic plants. PHYTOCHEMISTRY 2004; 65:147-58. [PMID: 14732274 DOI: 10.1016/j.phytochem.2003.10.017] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Long chain polyunsaturated fatty acids are now known to play important roles in human health. In particular, eicosapentaenoic acid (20:5Delta(5,8,11,14,17); n-3: EPA) is implicated as a protective agent in a range of pathologies such as cardiovascular disease and Metabolic Syndrome (Syndrome X). Eicosapentaenoic acid is currently sourced from fish oils, the presence of this fatty acid being due to the dietary piscine consumption of EPA-synthesising micro-algae. The biosynthetic pathway of EPA has been elucidated, and contains several alternative metabolic routes. Progress in using "reverse engineering" to transgenically mobilize the trait(s) for EPA are considered. In particular, the prospect of producing this important polyunsaturated fatty acid in transgenic oilseeds is highlighted, as is the urgent need for a sustainable replacement for diminishing fish stocks.
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Erren T. From David Horrobin’s legacies – the freedom to think and to use the head as a primary laboratory. Med Hypotheses 2003. [DOI: 10.1016/s0306-9877(03)00188-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Zhao LR, Duan WM, Reyes M, Verfaillie CM, Low WC. Immunohistochemical identification of multipotent adult progenitor cells from human bone marrow after transplantation into the rat brain. BRAIN RESEARCH. BRAIN RESEARCH PROTOCOLS 2003; 11:38-45. [PMID: 12697261 DOI: 10.1016/s1385-299x(03)00014-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the immunohistochemical analysis of the brain, tissue preparation and fixation are critical steps. During our studies of transplanting human bone marrow multipotent adult progenitor cells (hMAPCs) into the rat brain, we noticed that various methods of brain tissue preparation and fixation differentially influenced antigenic preservation in the transplants and in the host brain. Here, we report a simple, effective and reproducible method of tissue preparation and fixation that results in the immunohistochemical labeling of transplanted and host cells.
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Affiliation(s)
- Li-Ru Zhao
- Department of Neurosurgery, University of Minnesota Medical School, Lions Research Building, Room 421, 2001 Sixth Street S.E., Minneapolis 55455, USA
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Polimeni J, Reiss JP. Evolutionary perspectives on schizophrenia. CANADIAN JOURNAL OF PSYCHIATRY. REVUE CANADIENNE DE PSYCHIATRIE 2003; 48:34-9. [PMID: 12635562 DOI: 10.1177/070674370304800107] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The theory of evolution may be relevant to psychiatric disorders. Evolution reflects changes in genes throughout time. Thus, evolutionary forces can shape any phenotype that is genetically rooted and that possesses a long history. Schizophrenia is likely an ancient condition with a substantial genetic component. Since the 1960s, several researchers have applied evolutionary principles to the study of schizophrenia. In general, schizophrenia is either viewed as an evolutionary advantageous condition or as a disadvantageous byproduct of normal brain evolution. This paper reviews major evolutionary explanations--historical and current--that speculate on the possible origins of schizophrenia.
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Affiliation(s)
- Joseph Polimeni
- Department of Psychiatry, University of Manitoba, Winnipeg, MB R3E 3N4.
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Tachikawa H, Harada S, Kawanishi Y, Okubo T, Suzuki T. Linked polymorphisms (-333G>T and -286A>G) in the promoter region of the CCK-A receptor gene may be associated with schizophrenia. Psychiatry Res 2001; 103:147-55. [PMID: 11549403 DOI: 10.1016/s0165-1781(01)00276-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Cholecystokinin A receptors (CCKAR) modulate CCK-stimulated dopamine release, and mutations in the CCKAR gene may predispose affected individuals to schizophrenia. Our previous study suggested that -286A>G polymorphism (previously named 201A>G) in the CCKAR gene promoter is associated with schizophrenia. In the present study, we carried out a further investigation of the promoter and intron 1 of the CCKAR gene. In addition to polymorphisms reported previously (-333G>T, -286A>G, -241G>A, 773A>T, and 779T>C), two novel polymorphisms (-388(GT)(8)>(GT)(9) and -85C>G) were identified. These polymorphisms were in a linkage disequilibrium. Association analyses between schizophrenic patients and controls revealed that the frequencies of the A allele and AA genotype at the -286 loci, as well as the frequency of the GG genotype at the -333 loci, were significantly higher in patients than in controls. Furthermore, patients with paranoid type schizophrenia, auditory hallucinations, or a positive family history had a significantly higher frequency of the -286A allele than the control group. The results supported our previous data, and suggest the possible involvement of the -333G>T and the -286A>G polymorphisms in the promoter region of the CCKAR gene in the predisposition to schizophrenia.
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Affiliation(s)
- H Tachikawa
- Department of Psychiatry, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, 305-8575, Ibaraki, Japan.
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