1
|
Hazell AS. Stem Cell Therapy and Thiamine Deficiency-Induced Brain Damage. Neurochem Res 2024; 49:1450-1467. [PMID: 38720090 DOI: 10.1007/s11064-024-04137-5] [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: 02/24/2023] [Revised: 01/18/2024] [Accepted: 03/15/2024] [Indexed: 05/21/2024]
Abstract
Wernicke's encephalopathy (WE) is a major central nervous system disorder resulting from thiamine deficiency (TD) in which a number of brain regions can develop serious damage including the thalamus and inferior colliculus. Despite decades of research into the pathophysiology of TD and potential therapeutic interventions, little progress has been made regarding effective treatment following the development of brain lesions and its associated cognitive issues. Recent developments in our understanding of stem cells suggest they are capable of repairing damage and improving function in different maladys. This article puts forward the case for the potential use of stem cell treatment as a therapeutic strategy in WE by first examining the effects of TD on brain functional integrity and its consequences. The second half of the paper will address the future benefits of treating TD with these cells by focusing on their nature and their potential to effectively treat neurodegenerative diseases that share some overlapping pathophysiological features with TD. At the same time, some of the obstacles these cells will have to overcome in order to become a viable therapeutic strategy for treating this potentially life-threatening illness in humans will be highlighted.
Collapse
Affiliation(s)
- Alan S Hazell
- Department of Medicine, University of Montreal, 2335 Bennett Avenue, Montreal, QC, H1V 2T6, Canada.
| |
Collapse
|
2
|
Abstract
Thiamine (vitamin B1) is a water-soluble vitamin essential for human health. Thiamine deficiency is causal and/or contributory in a number of debilitating diseases including beri-beri, the Wernicke-Korsakoff syndrome, optic neuropathy, and others. While thiamine deficiency is relatively rare in developed nations as a result of dietary supplementation, thiamine deficiency is more common in nutritionally compromised populations. Thiamine pyrophosphate, a thiamine derivative, is essential to the citric acid cycle and thiamine deficiency can result in impaired aerobic respiration and cellular energy production. Thiamine also plays an important role in the pentose phosphate pathway and other key metabolic processes. Although thiamine deficiency is a known cause of lactic acidosis, it has been recently evaluated as a potential contributor to refractory lactic acidosis and organ injury in septic shock and other shock states. In this article, we review the epidemiology of thiamine deficiency in septic shock and the existing evidence base supporting thiamine supplementation. We conclude that specific sepsis phenotypes may stand to benefit the most from thiamine supplementation, and efforts might be made to identify and supplement these patients early in their hospital course.
Collapse
Affiliation(s)
- Ari Moskowitz
- Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Center for Resuscitation Science, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Michael W Donnino
- Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Center for Resuscitation Science, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
| |
Collapse
|
3
|
Medeiros RDCN, Moraes JO, Rodrigues SDC, Pereira LM, Aguiar HQDS, de Cordova CAS, Yim Júnior A, de Cordova FM. Thiamine Deficiency Modulates p38 MAPK and Heme Oxygenase-1 in Mouse Brain: Association with Early Tissue and Behavioral Changes. Neurochem Res 2020; 45:940-955. [PMID: 31989470 DOI: 10.1007/s11064-020-02975-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/11/2020] [Accepted: 01/22/2020] [Indexed: 12/18/2022]
Abstract
Thiamine deficiency (TD) produces severe neurodegenerative lesions. Studies have suggested that primary neurodegenerative events are associated with both oxidative stress and inflammation. Very little is known about the downstream effects on intracellular signaling pathways involved in neuronal death. The primary aim of this work was to evaluate the modulation of p38MAPK and the expression of heme oxygenase 1 (HO-1) in the central nervous system (CNS). Behavioral, metabolic, and morphological parameters were assessed. Mice were separated into six groups: control (Cont), TD with pyrithiamine (Ptd), TD with pyrithiamine and Trolox (Ptd + Tr), TD with pyrithiamine and dimethyl sulfoxide (Ptd + Dmso), Trolox (Tr) and DMSO (Dmso) control groups and treated for 9 days. Control groups received standard feed (AIN-93M), while TD groups received thiamine deficient feed (AIN-93DT). All the groups were subjected to behavioral tests, and CNS samples were collected for cell viability, histopathology and western blot analyses. The Ptd group showed a reduction in weight gain and feed intake, as well as a reduction in locomotor, grooming, and motor coordination activities. Also, Ptd group showed a robust increase in p38MAPK phosphorylation and mild HO-1 expression in the cerebral cortex and thalamus. The Ptd group showed a decreased cell viability, hemorrhage, spongiosis, and astrocytic swelling in the thalamus. Groups treated with Trolox and DMSO displayed diminished p38MAPK phosphorylation in both the structures, as well as attenuated thalamic lesions and behavioral activities. These data suggest that p38MAPK and HO-1 are involved in the TD-induced neurodegeneration in vivo, possibly modulated by oxidative stress and neuroinflammation.
Collapse
Affiliation(s)
- Rita de Cássia Noronha Medeiros
- Programa de Pós-Graduação em Sanidade Animal e Saúde Pública nos Trópicos, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil
| | - Juliana Oliveira Moraes
- Programa de Pós-Graduação em Sanidade Animal e Saúde Pública nos Trópicos, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil
| | | | - Leidiano Martins Pereira
- Curso de Medicina Veterinária, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil
| | - Helen Quézia da Silva Aguiar
- Curso de Medicina Veterinária, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil
| | | | - Alberto Yim Júnior
- Curso de Medicina Veterinária, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil
| | - Fabiano Mendes de Cordova
- Programa de Pós-Graduação em Sanidade Animal e Saúde Pública nos Trópicos, Universidade Federal do Tocantins, BR-153, km 112, Araguaína, TO, 77804-970, Brazil.
| |
Collapse
|
4
|
Thiamine as a Renal Protective Agent in Septic Shock. A Secondary Analysis of a Randomized, Double-Blind, Placebo-controlled Trial. Ann Am Thorac Soc 2018; 14:737-741. [PMID: 28207287 DOI: 10.1513/annalsats.201608-656bc] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
RATIONALE Acute kidney injury (AKI) is common in patients with sepsis and has been associated with high mortality rates. The provision of thiamine to patients with sepsis may reduce the incidence and severity of sepsis-related AKI and thereby prevent renal failure requiring renal replacement therapy (RRT). OBJECTIVES To test the hypothesis that thiamine supplementation mitigates kidney injury in septic shock. METHODS This was a secondary analysis of a single-center, randomized, double-blind trial comparing thiamine to placebo in patients with septic shock. Renal function, need for RRT, timing of hemodialysis catheter placement, and timing of RRT initiation were abstracted. The baseline creatinine and worst creatinine values between 3 and 24 hours, 24 and 48 hours, and 48 and 72 hours were likewise abstracted. RESULTS There were 70 patients eligible for analysis after excluding 10 patients in whom hemodialysis was initiated before study drug administration. Baseline serum creatinine in the thiamine group was 1.2 mg/dl (interquartile range, 0.8-2.5) as compared with 1.8 mg/dl (interquartile range, 1.3-2.7) in the placebo group (P = 0.3). After initiation of the study drug, more patients in the placebo group than in the thiamine group were started on RRT (eight [21%] vs. one [3%]; P = 0.04). In the repeated measures analysis adjusting for the baseline creatinine level, the worst creatinine levels were higher in the placebo group than in the thiamine group (P = 0.05). CONCLUSIONS In this post hoc analysis of a randomized controlled trial, patients with septic shock randomized to receive thiamine had lower serum creatinine levels and a lower rate of progression to RRT than patients randomized to placebo. These findings should be considered hypothesis generating and can be used as a foundation for further, prospective investigation in this area.
Collapse
|
5
|
de Andrade JAA, Gayer CRM, Nogueira NPDA, Paes MC, Bastos VLFC, Neto JDCB, Alves SC, Coelho RM, da Cunha MGAT, Gomes RN, Águila MB, Mandarim-de-Lacerda CA, Bozza PT, da Cunha S. The effect of thiamine deficiency on inflammation, oxidative stress and cellular migration in an experimental model of sepsis. JOURNAL OF INFLAMMATION-LONDON 2014; 11:11. [PMID: 24826081 PMCID: PMC4018973 DOI: 10.1186/1476-9255-11-11] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Accepted: 04/14/2014] [Indexed: 01/06/2023]
Abstract
Background Sepsis is a prevalent condition in critically ill patients and may be associated with thiamine deficiency (TD). The aim of this study was to evaluate the effect of TD on inflammation, oxidative stress and cellular recruitment in a sepsis model. Methods The experimental sepsis model, cecal ligation and puncture (CLP), was utilized on mice in comparison with a sham procedure. The following four groups were compared against each other: SHAM with AIN93G complete chow, SHAM with thiamine deficient (TD) chow, CLP with AIN93G complete chow, and CLP with TD chow. Thiamine pyrophosphate (TPP) blood concentrations were determined, and blood and peritoneal fluid were evaluated for differences in TNF-alpha, IL-1, IL-6, KC and MCP-1/CCL2 levels. In addition, the levels of 4-HNE adducts in liver proteins were evaluated by Western Blot. Results The mean TPP blood concentration from the mice fed with the complete chow was 303.3 ± 42.6 nmol/L, and TD occurred within 10 days. TNF-α and MCP-1 concentrations in the peritoneal fluid were significantly greater in the CLP with TD chow group when compared with the other groups. The blood IL-1β level, however, was lower in the CLP with TD chow group. Liver 4-HNE levels were highest in the TD chow groups. Blood mononuclear cell numbers, as well as peritoneal total leukocyte, mononuclear cell and neutrophil numbers were greater in the CLP with TD chow group. Peritoneal bacterial colony forming units (CFU) were significantly lower in the CLP with TD chow group. Conclusion TD was associated with greater bacterial clearance, oxidative stress and inflammatory response changes.
Collapse
Affiliation(s)
- José Antenor Araújo de Andrade
- Intensive Care Unit, Pedro Ernesto University Hospital, State University of Rio de Janeiro, Av. 28 de Setembro 87, Rio de Janeiro, RJ CEP 20551-030, Brazil
| | - Carlos Roberto Machado Gayer
- Biochemistry Department, Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Márcia Cristina Paes
- Biochemistry Department, Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vera Lúcia Freire Cunha Bastos
- Biochemistry Department, Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jayme da Cunha Bastos Neto
- Biochemistry Department, Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | | | - Rachel Novaes Gomes
- Immunopharmacology Laboratory, Oswaldo Cruz Institute, Rio de Janeiro, Brazil
| | - Márcia Barbosa Águila
- Morphometry, Metabolism & Cardiovascular Laboratory; Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Carlos Alberto Mandarim-de-Lacerda
- Morphometry, Metabolism & Cardiovascular Laboratory; Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Sérgio da Cunha
- Intensive Care Unit, Pedro Ernesto University Hospital, State University of Rio de Janeiro, Av. 28 de Setembro 87, Rio de Janeiro, RJ CEP 20551-030, Brazil
| |
Collapse
|
6
|
Abstract
Thiamine (vitamin B 1) was the first B vitamin to have been identified. It serves as a cofactor for several enzymes involved in energy metabolism. The thiamine-dependent enzymes are important for the biosynthesis of neurotransmitters and for the production of reducing substances used in oxidant stress defenses, as well as for the synthesis of pentoses used as nucleic acid precursors. Thiamine plays a central role in cerebral metabolism. Its deficiency results in dry beriberi, a peripheral neuropathy, wet beriberi, a cardiomyopathy with edema and lactic acidosis, and Wernicke—Korsakoff syndrome, whose manifestations consist of nystagmus, ophthalmoplegia, and ataxia evolving into confusion, retrograde amnesia, cognitive impairment, and confabulation. Patients on a strict thiamine-deficient diet display a state of severe depletion within 18 days. The most common cause of thiamine deficiency in affluent countries is either alcoholism or malnutrition in nonalcoholic patients. Treatment by thiamine supplementation is beneficial for diagnostic and therapeutic purposes.
Collapse
|
7
|
Zhang Q, Yang G, Li W, Fan Z, Sun A, Luo J, Ke ZJ. Thiamine deficiency increases β-secretase activity and accumulation of β-amyloid peptides. Neurobiol Aging 2011; 32:42-53. [DOI: 10.1016/j.neurobiolaging.2009.01.005] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Revised: 12/28/2008] [Accepted: 01/07/2009] [Indexed: 11/30/2022]
|
8
|
Lee S, Yang G, Yong Y, Liu Y, Zhao L, Xu J, Zhang X, Wan Y, Feng C, Fan Z, Liu Y, Luo J, Ke ZJ. ADAR2-dependent RNA editing of GluR2 is involved in thiamine deficiency-induced alteration of calcium dynamics. Mol Neurodegener 2010; 5:54. [PMID: 21110885 PMCID: PMC3006372 DOI: 10.1186/1750-1326-5-54] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 11/27/2010] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Thiamine (vitamin B1) deficiency (TD) causes mild impairment of oxidative metabolism and region-selective neuronal loss in the central nervous system (CNS). TD in animals has been used to model aging-associated neurodegeneration in the brain. The mechanisms of TD-induced neuron death are complex, and it is likely multiple mechanisms interplay and contribute to the action of TD. In this study, we demonstrated that TD significantly increased intracellular calcium concentrations [Ca2+]i in cultured cortical neurons. RESULTS TD drastically potentiated AMPA-triggered calcium influx and inhibited pre-mRNA editing of GluR2, a Ca2+-permeable subtype of AMPA receptors. The Ca2+ permeability of GluR2 is regulated by RNA editing at the Q/R site. Edited GluR2 (R) subunits form Ca2+-impermeable channels, whereas unedited GluR2 (Q) channels are permeable to Ca2+ flow. TD inhibited Q/R editing of GluR2 and increased the ratio of unedited GluR2. The Q/R editing of GluR2 is mediated by adenosine deaminase acting on RNA 2 (ADAR2). TD selectively decreased ADAR2 expression and its self-editing ability without affecting ADAR1 in cultured neurons and in the brain tissue. Over-expression of ADAR2 reduced AMPA-mediated rise of [Ca2+]i and protected cortical neurons against TD-induced cytotoxicity, whereas down-regulation of ADAR2 increased AMPA-elicited Ca2+ influx and exacerbated TD-induced death of cortical neurons. CONCLUSIONS Our findings suggest that TD-induced neuronal damage may be mediated by the modulation of ADAR2-dependent RNA Editing of GluR2.
Collapse
Affiliation(s)
- Shuchen Lee
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Guang Yang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yue Yong
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Ying Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Liyun Zhao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jing Xu
- Department of Anesthesiology, Gongli Hospital, Pudong, Shanghai, China
| | - Xiaomin Zhang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yanjie Wan
- Department of Anesthesiology, Gongli Hospital, Pudong, Shanghai, China
| | - Chun Feng
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Zhiqin Fan
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yong Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jia Luo
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
- Department of Internal Medicine, University of Kentucky College of Medicine, 130 Bosomworth Health Science Research Building, 1095 Veterans Drive, Lexington, Kentucky 40536, USA
| | - Zun-Ji Ke
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| |
Collapse
|
9
|
Wang D, Hazell AS. Microglial activation is a major contributor to neurologic dysfunction in thiamine deficiency. Biochem Biophys Res Commun 2010; 402:123-8. [PMID: 20932820 DOI: 10.1016/j.bbrc.2010.09.128] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Accepted: 09/29/2010] [Indexed: 10/19/2022]
Abstract
In Wernicke's encephalopathy and thiamine deficiency (TD), the cause of this brain disorder, development of inflammation is an important aspect of the disease process. How this pathological mechanism relates to the neurologic impairment associated with TD, however, remains unclear. A key feature of the inflammatory process is the activation of microglia. In the present study, we evaluated the role of microglial activation in the pathophysiology of TD by examining the relationship between levels of CD11b/c and CD68, two proteins associated with microglial activation, and neurological dysfunction under conditions of TD. Rats with TD showed large increases in expression of both CD11b/c and CD68 in the vulnerable thalamus and inferior colliculus, with no change in mRNA levels in the relatively non-vulnerable frontal cortex. These alterations in CD11b/c and CD68 expression were reflected in dramatic upregulation of both proteins by immunoblotting and immunohistochemical methods. Co-treatment of rats with TD and the anti-inflammatory drug minocycline prevented microglial activation, and onset of neurological changes, including loss of righting reflex, was delayed by approximately 39h, compared to animals with TD alone. In addition, co-treatment of rats with TD and N-acetylcysteine prevented the increase in CD11b/c and CD68, but did not alter the onset of neurological impairment. These results suggest that microglial activation plays a role in the development of neurological impairment in TD and possibly Wernicke's encephalopathy, and that while development of oxidative stress may be involved in microglial activation, the basis of this neurologic dysfunction is likely to be multifactorial in nature.
Collapse
Affiliation(s)
- Dongmei Wang
- Department of Medicine, University of Montreal, Montreal, Quebec, Canada
| | | |
Collapse
|
10
|
Metabolic and structural role of thiamine in nervous tissues. Cell Mol Neurobiol 2008; 28:923-31. [PMID: 18642074 DOI: 10.1007/s10571-008-9297-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Accepted: 06/30/2008] [Indexed: 02/03/2023]
Abstract
In the literature, previous descriptions of the role of thiamine (B1 vitamin) focused mostly on its biochemical functions as a coenzyme precursor of some key enzymes of the carbohydrate metabolism. This report reviews recent developments on the metabolic and structural role of thiamine, e.g., the coenzyme and noncoenzyme functions of the vitamin. Taking into account analysis of our experimental data relating to the effects of thiamine deficiency on developing central nervous system (CNS) and data available in literature, we seek to establish a clear difference between the metabolic and structural role of thiamine. Our experimental data indicate that the specific and nonspecific effects express two diametrically diverse functions of thiamine in development: the nonspecific effects show up the metabolic consequences of thiamine deficiency resulting in apoptosis and severe cellular deficit; inversely, the specific effects announced the structural consequences of thiamine deficiency, described as cellular membrane damage, irregular and ectopic cells. The review highlights the existence of noncoenzyme functions of this vitamin through its interactions with biological membranes.
Collapse
|
11
|
Thiamine deficiency induces oxidative stress and exacerbates the plaque pathology in Alzheimer's mouse model. Neurobiol Aging 2008; 30:1587-600. [PMID: 18406011 DOI: 10.1016/j.neurobiolaging.2007.12.013] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Revised: 12/11/2007] [Accepted: 12/14/2007] [Indexed: 01/28/2023]
Abstract
Mitochondrial dysfunction, oxidative stress and reductions in thiamine-dependent enzymes have been implicated in multiple neurological disorders including Alzheimer's disease (AD). Experimental thiamine deficiency (TD) is an established model for reducing the activities of thiamine-dependent enzymes in brain. TD diminishes thiamine-dependent enzymes throughout the brain, but produces a time-dependent selective neuronal loss, glial activation, inflammation, abnormalities in oxidative metabolism and clusters of degenerating neurites in only specific thalamic regions. The present studies tested how TD alters brain pathology in Tg19959 transgenic mice over expressing a double mutant form of the amyloid precursor protein (APP). TD exacerbated amyloid plaque pathology in transgenic mice and enlarged the area occupied by plaques in cortex, hippocampus and thalamus by 50%, 200% and 200%, respectively. TD increased Abeta(1-42) levels by about three fold, beta-CTF (C99) levels by 33% and beta-secretase (BACE1) protein levels by 43%. TD-induced inflammation in areas of plaque formation. Thus, the induction of mild impairment of oxidative metabolism, oxidative stress and inflammation induced by TD alters metabolism of APP and/or Abeta and promotes accumulation of plaques independent of neuron loss or neuritic clusters.
Collapse
|
12
|
Abstract
Thiamine or vitamin B(1), an essential nutrient absorbed from the diet, is involved in vital brain metabolic and cellular functions, including carbohydrate metabolism and neurotransmitter production. Diencephalic regions and, in particular, the cerebellum demonstrate lesions in cases of prolonged thiamine deficiency, such as that observed in alcohol-dependent individuals or in patients with cancer or AIDS. The purpose of this review is to demonstrate recent evidence of cerebellar dysfunction resulting from thiamine deficiency and to assemble theories as to why the cerebellum may be sensitive to this type of insult. A brief outline on cerebellar structure and function, as well as a short discussion on thiamine and thiamine deficiency are provided before detailing the conditions and mechanisms underlying thiamine deficiency-induced cerebellar dysfunction. Although much is known regarding cell loss from a lack of thiamine, further work is still required to identify the sequelae of events leading to the susceptibility of the cerebellum to injury stemming from a thiamine deficient diet or impaired thiamine utilization.
Collapse
Affiliation(s)
- Patrick J Mulholland
- Medical University of South Carolina, Center for Drug and Alcohol Programs, Charleston, 29425, USA.
| |
Collapse
|
13
|
Ke ZJ, Gibson GE. Selective response of various brain cell types during neurodegeneration induced by mild impairment of oxidative metabolism. Neurochem Int 2004; 45:361-9. [PMID: 15145550 DOI: 10.1016/j.neuint.2003.09.008] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2003] [Revised: 06/26/2003] [Accepted: 09/07/2003] [Indexed: 11/25/2022]
Abstract
Age-related neurodegenerative diseases are characterized by selective neuron loss, glial activation, inflammation and abnormalities in oxidative metabolism. Thiamine deficiency (TD) is a model of neurodegeneration induced by impairment of oxidative metabolism. TD produces a time-dependent, selective neuronal death in specific brain regions, while other cell types are either activated or unaffected. TD-induced neurodegeneration occurs first in a small, well-defined brain region, the submedial thalamic nucleus (SmTN). This discrete localization permits careful analysis of the relationship between neuronal loss and the response of other cell types. The temporal analysis of the changes in the region in combination with the use of transgenic mice permits testing of proposed mechanisms of how the interaction of neurons with other cell types produces neurodegeneration. Loss of neurons and elevation in markers of neurodegeneration are accompanied by changes in microglia including increased redox active iron, the induction of nitric oxide synthase (NOS) and hemeoxygenase-1, a marker of oxidative stress. Endothelial cells also show changes in early stages of TD including induction of intracellular adhesion molecule-1 (ICAM-1) and endothelial NOS. The number of degranulating mast cells also increases in early stages of TD. Alterations in astrocytes and neutrophils occur at later stages of TD. Studies with transgenic knockouts indicate that the endothelial cell changes are particularly important. We hypothesize that TD-induced abnormalities in oxidative metabolism promote release of neuronal inflammatory signals that activate microglia, astrocytes and endothelial cells. Although at early stages the responses of non-neuronal cells may be neuroprotective, at late phases they lead to entry of peripheral inflammatory cells into the brain and promote neurodegeneration.
Collapse
Affiliation(s)
- Zun-Ji Ke
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University at Burke Medical Research Institute, 785 Mamaroneck Avenue, White Plains, NY 10605, USA.
| | | |
Collapse
|