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Ramos-Rosales DF, Vazquez-Alaniz F, Urtiz-Estrada N, Ramirez-Valles EG, Mendez-Hernádez EM, Salas-Leal AC, Barraza-Salas M. Epigenetic marks in suicide: a review. Psychiatr Genet 2021; 31:145-161. [PMID: 34412082 DOI: 10.1097/ypg.0000000000000297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Suicide is a complex phenomenon and a global public health problem that involves several biological factors that could contribute to the pathophysiology of suicide. There is evidence that epigenetic factors influence some psychiatric disorders, suggesting a predisposition to suicide or suicidal behavior. Here, we review studies of molecular mechanisms of suicide in an epigenetic perspective in the postmortem brain of suicide completers and peripheral blood cells of suicide attempters. Besides, we include studies of gene-specific DNA methylation, epigenome-wide association, histone modification, and interfering RNAs as epigenetic factors. This review provides an overview of the epigenetic mechanisms described in different biological systems related to suicide, contributing to an understanding of the genetic regulation in suicide. We conclude that epigenetic marks are potential biomarkers in suicide, and they could become attractive therapeutic targets due to their reversibility and importance in regulating gene expression.
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Affiliation(s)
| | - Fernando Vazquez-Alaniz
- Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango
- Hospital General 450. Servicios de Salud de Durango
| | | | | | - Edna M Mendez-Hernádez
- Instituto de Investigación Científica, Universidad Juárez del Estado de Durango, Durango, México
| | - Alma C Salas-Leal
- Instituto de Investigación Científica, Universidad Juárez del Estado de Durango, Durango, México
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王 虎, 高 震, 陈 梦, 吴 海, 张 桂, 展 淑, 卜 宁, 刘 璟, 翟 跃. [Effects of recombinant human erythropoietin on brain-derived neurotrophic factor expression in different brain regions of aging rats]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2016; 37:551-554. [PMID: 28446413 PMCID: PMC6744085 DOI: 10.3969/j.issn.1673-4254.2017.04.23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To explore the effect of recombinant human erythropoietin (rhEPO) on expression of brain-derived neurotrophic factor (BDNF) in different brain regions of aging rats. METHODS Forty male SD rats were randomized equally into negative control group, D-galactose group, EPO treatment group, and positive control group. Rat models of subacute aging were established by continuous subcutaneous injection of 5% D-galactose. Immunohistochemical staining was used to analyze the variation of BDNF expressions in different brain regions of the aging rats with different treatments. RESULTS Significant brain region-specific differences in BDNF expression were found among the rats in different groups. Compared with those in the negative control group, the numbers of BDNF-positive cells in the hippocampal CA1 region, CA3 region, dentate gyrus (DG) and frontal cortex were all decreased obviously in D-galactose group (P<0.05) but increased in both EPO group and the positive control group (P<0.05) without significant differences between the latter two groups. In the rats in the same group, the number of BDNF-positive cells varied markedly in different brain regions (P<0.05), and the expression level of BDNF was the highest in the frontal cortex followed by the hippocampal CA3 region and the dentate gyrus, and was the lowest in the hippocampal CA1 region. CONCLUSION Treatment with rhEPO enhances the expression of BDNF in rat neural cells, suggesting that rhEPO may protect the nervous system from aging by regulating the BDNF pathway.
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Affiliation(s)
- 虎清 王
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 震 高
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 梦燚 陈
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 海琴 吴
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 桂莲 张
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 淑琴 展
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 宁 卜
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 璟洁 刘
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - 跃芬 翟
- />西安交通大学医学院第二附属医院神经内科，陕西 西安 710004Department of Neurology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
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Eisen RB, Perera S, Banfield L, Anglin R, Minuzzi L, Samaan Z. Association between BDNF levels and suicidal behaviour: a systematic review and meta-analysis. Syst Rev 2015; 4:187. [PMID: 26718989 PMCID: PMC4697315 DOI: 10.1186/s13643-015-0179-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 12/21/2015] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Suicidal behaviour is a complex phenomenon with a multitude of risk factors. Brain-derived neurotrophic factor (BDNF), a protein crucial to nervous system function, may be involved in suicide risk. The objective of this systematic review is to evaluate and summarize the literature examining the relationship between BDNF levels and suicidal behaviour. METHODS A predefined search strategy was used to search MEDLINE, EMBASE, PsychINFO, and CINAHL from inception to December 2015. Studies were included if they investigated the association between BDNF levels and suicidal behaviours (including completed suicide, attempted suicide, or suicidal ideation) by comparing BDNF levels in groups with and without suicidal behaviour. Only the following observational studies were included: case-control and cohort studies. Both clinical- and community-based samples were included. Screening, data extraction, and risk of bias assessment were conducted in duplicate. RESULTS Six-hundred thirty-one articles were screened, and 14 were included in the review. Three studies that assessed serum BDNF levels in individuals with suicide attempts and controls were combined in a meta-analysis that showed no significant association between serum BDNF and suicide attempts. The remaining 11 studies were not eligible for the meta-analysis and provided inconsistent findings regarding associations between BDNF and suicidal behaviour. CONCLUSIONS The findings of the meta-analysis indicate that there is no significant association between serum BDNF and attempted suicide. The qualitative review of the literature did not provide consistent support for an association between BDNF levels and suicidal behaviour. The evidence has significant methodological limitations. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42015015871.
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Affiliation(s)
- Rebecca B Eisen
- MiNDS Neuroscience Graduate Program, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada.
| | - Stefan Perera
- Health Research Methodology Graduate Program, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada. .,Department of Clinical Epidemiology and Biostatistics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada.
| | - Laura Banfield
- Health Sciences Library, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada.
| | - Rebecca Anglin
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, 1280 Main St. West, Hamilton, ON, L8S 4L8, Canada. .,Department of Medicine, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada.
| | - Luciano Minuzzi
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, 1280 Main St. West, Hamilton, ON, L8S 4L8, Canada. .,Women's Health Concerns Clinic, St. Joseph's Healthcare Hamilton, 50 Charlton Avenue East, Hamilton, ON, L8N 4A6, Canada.
| | - Zainab Samaan
- Department of Clinical Epidemiology and Biostatistics, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada. .,Department of Psychiatry and Behavioural Neurosciences, McMaster University, 1280 Main St. West, Hamilton, ON, L8S 4L8, Canada. .,Population Genomics Program, Chanchlani Research Centre, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, Canada. .,Peter Boris Centre for Addiction Research, St. Joseph's Healthcare Hamilton, 100 West 5th Street, Hamilton, ON, L8P 3R2, Canada.
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