-
Mutation Research. Reviews in Mutation... 2021Chronic diseases such as cardiovascular diseases, type 2 diabetes or cancer are the global leading cause of mortality. Lifestyle interventions are most effective in...
Impact of dietary and lifestyle interventions in elderly or people diagnosed with diabetes, metabolic disorders, cardiovascular disease, cancer and micronutrient deficiency on micronuclei frequency - A systematic review and meta-analysis.
Chronic diseases such as cardiovascular diseases, type 2 diabetes or cancer are the global leading cause of mortality. Lifestyle interventions are most effective in reducing metabolic risk factors, disease progression or even side effects of a disease. They are also contributing to decelerate the aging process. Genome instability is very often associated with aging or the above-mentioned diseases, and triggered by inflammation and oxidative stress. An established method to measure chromosomal damage is the cytokinesis block micronucleus (CBMN) cytome assay. The aim of this review and meta-analysis is to collect and analyse the current literature regarding the effects of a lifestyle based (dietary) intervention on changes of micronuclei (MNi), nucleoplasmic bridges (NPBs) and nuclear buds (NBUDs) in elderly subjects or people diagnosed with diabetes, metabolic disorders, cardiovascular disease, cancer or micronutrient deficiency. Although the main important diseases were considered as well as the large topic of aging, the number and methodological quality in terms of samples size, duration and rationale of the intervention or an inclusion of a control group of available intervention studies with these backgrounds was low. Most of the studies used antioxidant vitamins or folate, few investigated the whole diet. Only one study showed a physical activity intervention approach. The interventions did not lead to decreased genomic marker despite a few cancer related studies, where particularly MN frequency in mucosa lesions and leukoplakia was reduced by green tea and antioxidants. The performed meta-analysis of the available RCTs did not show a significant reduction of MNi, NBUDs or NPBs of most of the interventions performed, except for green tea. Data show in general a lack of an appropriate number of sound lifestyle based intervention studies linking cytogenetic damage and chronic diseases.
Topics: Cardiovascular Diseases; DNA Damage; Diabetes Mellitus; Humans; Metabolic Diseases; Micronucleus Tests; Neoplasms
PubMed: 34083034
DOI: 10.1016/j.mrrev.2021.108367 -
Mutation Research. Reviews in Mutation... 2016Pesticides are widely used around the world, and hundreds of millions of people are exposed annually in occupational and environmental settings. Numerous studies have... (Review)
Review
Pesticides are widely used around the world, and hundreds of millions of people are exposed annually in occupational and environmental settings. Numerous studies have demonstrated relationships between pesticide exposure and increased risk of cancers, neurodegenerative and neurodevelopmental disorders, respiratory diseases and diabetes. Assessment of genotoxicity of pesticides and biomonitoring their effect in exposed populations is critical for a better regulation and protection, but it can be complicated because pesticides are often used as complex mixtures. The cytokinesis-block micronucleus assay in human lymphocytes (L-CBMN) is a validated method of assessment of DNA damage induced by clastogenic and aneuploidogenic mechanisms. The goal of this review is to provide an updated summary of publications on biomonitoring studies using this assay in people exposed to pesticides in different settings, and to identify gaps in knowledge, and future directions. A literature search was conducted through MedLine/PubMed and TOXLINE electronic databases up to December 2015. A total of 55 full-text articles, related to 49 studies, excluding reviews, were selected for in depth analysis, divided by the settings where exposures occurred, such as chemical plant workers, pesticide sprayers, floriculturists, agricultural workers and non-occupationally exposed groups. Majority of studies (36 out of 49) reported positive findings with L-CBMN assay. However, most of the studies of professional applicators that used single pesticide or few compounds in the framework of specific programs did not show significant increases in MN frequency. A decreased level of pesticide-induced genotoxicity was associated with the proper use of personal protection. In contrast, subjects working in greenhouses or during intensive spraying season and having acute exposure, showed consistent increases in MN frequency. Overall, this analysis confirmed that L-CBMN is an excellent tool for pesticide biomonitoring, and can validate the effects of educational and intervention programs on reducing exposure and genetic damage.
Topics: Cytokinesis; Environmental Exposure; Female; Humans; Lymphocytes; Male; Micronucleus Tests; Occupational Exposure; Pesticides
PubMed: 27894686
DOI: 10.1016/j.mrrev.2016.04.006 -
Mutation Research. Genetic Toxicology... 2022The evaluation of genotoxicity in workers exposed to different toxic agents is very important, especially considering the association between these exposures in a...
The evaluation of genotoxicity in workers exposed to different toxic agents is very important, especially considering the association between these exposures in a chronic context and DNA damage. Assessing biomarkers of exposure and, when possible, early biomarkers of effect, contributes to elucidating the potential toxic mechanisms involved in genotoxicity and its contribution to chronic non-communicable diseases. In Brazil, the biggest country in South America, workers are exposed to hazardous physical and chemical agents. Considering that these exposures occur, in most cases, throughout the worker's whole life, this is an important public health concern in Brazil. Therefore, this systematic review aims to analyze occupational exposure to chemical and physical agents and the association with DNA damage in studies carried out in Brazil from 1980 to 2021. A systematic and comprehensive literature search was performed in different databases based on occupational exposure to chemical and physical agents and DNA damage. Only full articles on studies that investigated experimental evidence on occupational exposure in Brazil and assessed DNA damage were included, amounting to 89 articles. Five main occupational exposure groups were identified: pesticides (36%), organic solvents (20%), dust and particles (16%), metals (11%), and ionizing radiation (6%). Another group called "others" included studies (11%) that did not fall into these main groups. It was found that comet assay and micronucleus tests are the most adopted methods to detect DNA damage. Occupational exposures were most associated with DNA damage. However, further improvements in study design would be needed to better characterize the association between biomonitoring and DNA damage, particularly to account for confounding factors.
Topics: Biomarkers; Brazil; Comet Assay; DNA Damage; Humans; Micronucleus Tests; Occupational Exposure
PubMed: 35914865
DOI: 10.1016/j.mrgentox.2022.503519 -
Journal of Clinical Anesthesia Dec 2016Anesthetic gases have been used for a long time. Adverse effects of anesthetic gases to occupationally exposed people have been well documented in the literature. Due to... (Review)
Review
BACKGROUND AND OBJECTIVE
Anesthetic gases have been used for a long time. Adverse effects of anesthetic gases to occupationally exposed people have been well documented in the literature. Due to low solubility, these gases are rapidly eliminated from the human body. Nevertheless, neurotoxic, immunosuppressive, hepatotoxic and reproductive toxicological effects have been shown in many of the scientific works. However, there is no detailed systematic bio-monitoring review about genotoxicity risk among occupationally exposed people. We herein performed systematic review based on relevant studies.
METHODS
This work reviews the published literature about the genotoxic effects of anesthetic gases among operating room personnel published between 1989 and September 2015. We performed a computerized search of articles on Pubmed, Scopus, Web of Science, and Google Scholar.
RESULTS
Analyzed works have shown us that chromosomal aberration, sister chromatid exchanges, micronucleus and comet assays were the most frequently used genotoxicity end-points. In almost all data, occupational exposure to anesthetic gases has been associated with statistically significant increase in genotoxic damage among operating room personnel.
CONCLUSION
Health care workers are exposed to wide variety of agents including biological, physical and chemical factors. Among them anesthetic gases seems to be deserve special attentions since their genotoxic, mutagenic activities. In addition, chronic exposure to all anesthetic gases instead of alone induces cumulative genotoxic effects.
Topics: Anesthetics, Inhalation; Chromosome Aberrations; Comet Assay; DNA Damage; Environmental Monitoring; Health Personnel; Humans; Micronuclei, Chromosome-Defective; Occupational Exposure; Operating Rooms; Risk; Sister Chromatid Exchange
PubMed: 27871551
DOI: 10.1016/j.jclinane.2016.08.029 -
Human & Experimental Toxicology 2023This systematic review, conducted according to the PRISMA guidelines, focuses on genotoxicity of oxidative hair dye precursors. The search for original papers published...
This systematic review, conducted according to the PRISMA guidelines, focuses on genotoxicity of oxidative hair dye precursors. The search for original papers published from 2000 to 2021 was performed in Medline, Web of Science, Cochrane registry, Scientific Committee on Consumer Safety of the European Commission and German MAK Commission opinions. Nine publications on genotoxicity of -phenylenediamine (PPD) and toluene-2,5-diamine (-toluylenediamine; PTD) were included, reporting results of 17 assays covering main genotoxicity endpoints. PPD and PTD were positive in bacterial mutation assay, and PPD tested positive also for somatic cell mutations in the Rodent assay . Clastogenicity of PPD and PTD was revealed by chromosomal aberration assay. The alkaline comet assay showed DNA damage after PPD exposure, which was not confirmed where PTD exhibited positive results. PPD induced micronucleus formation , and increased micronucleus frequencies in mice erythrocytes following high dose oral exposure . Based on the results of a limited number of data from the classical genotoxicity assay battery, this systematic review indicates genotoxic potential of hair dye precursors PPD and PTD, which may present an important health concern for consumers and in particular for professional hairdressers.
Topics: Animals; Mice; Hair Dyes; DNA Damage; Comet Assay; Mutation; Oxidative Stress
PubMed: 36879522
DOI: 10.1177/09603271231159803 -
Toxicology Letters Jul 2020The in vivo comet assay is an established genotoxicity test, with an OECD test guideline, but in its standard form it measures only DNA strand breaks. Including in the...
The in vivo comet assay is an established genotoxicity test, with an OECD test guideline, but in its standard form it measures only DNA strand breaks. Including in the assay an additional step, in which the DNA is incubated with a lesion-specific enzyme, can provide important information about the nature of the DNA damage. Formamidopyrimidine DNA glycosylase, 8-oxoguanine DNA glycosylase or endonuclease III are commonly used in the in vitro genotoxicity test and in human biomonitoring to detect oxidised bases, but in vivo applications are rarer. A systematic literature search has identified a total of 60 papers that report such in vivo experiments, testing a variety of agents. In many cases, strand breaks were not seen, but significant levels of enzyme-sensitive sites were induced - indicating a mechanism of action involving oxidative stress. Compounds such as methyl methanesulfonate (MMS) or ethyl methanesulfonate (EMS) could be used as positive controls in both the standard and the enzyme-modified in vivo comet assays.
Topics: Animals; Biological Monitoring; Comet Assay; DNA; DNA Damage; Humans; Mutagenicity Tests; Oxidative Stress
PubMed: 32247831
DOI: 10.1016/j.toxlet.2020.03.016 -
Expert Opinion on Drug Safety Jul 2008Preliminary research results indicate that exposure to anesthetics affects health. (Review)
Review
BACKGROUND
Preliminary research results indicate that exposure to anesthetics affects health.
OBJECTIVE
To provide, with evidence-based knowledge, the answer to the question: What are the genotoxic effects threatening people exposed to anesthetics?
METHOD
A systematic review of scientific literature. A systematic search of The Cochrane Library, MedLine, and CINAHL resulted in a screening of 212 abstracts of which 54 articles were assessed for quality. The 54 articles assessed covered areas on general health effects (neurobehavioral effects, immunology) and, in particular, genotoxic effects.
RESULTS/CONCLUSION
In the scientific literature reviewed, there is evidence of exposure to anesthetics, especially nitrous oxide and halogenated gases, being associated with general health and genotoxic risks, but conflicting results have been obtained. The result of this review further stresses the need for scientific knowledge in this area and enhances the studies, above all, on people exposed for long periods.
Topics: Anesthetics, Inhalation; Animals; Clinical Trials as Topic; Humans; Hydrocarbons, Halogenated; Mutagenicity Tests; Mutagens; Nitrous Oxide; Occupational Exposure; Time Factors
PubMed: 18613808
DOI: 10.1517/14740338.7.4.447 -
Mutation Research 2010Micronucleus (MN) assay in buccal exfoliated cells is a minimally invasive method for monitoring genetic damage in human populations. Statistical and epidemiological... (Review)
Review
OBJECTIVES
Micronucleus (MN) assay in buccal exfoliated cells is a minimally invasive method for monitoring genetic damage in human populations. Statistical and epidemiological issues related to the design and analysis of studies based on this biomarker are addressed.
METHODS
A systematic review of recent literature on the buccal MN assay has been carried out to provide a state-of-the-art evaluation of how critical topics such as control for confounding, sample size and statistical power, number of cells scored, endpoint selection, and statistical modelling, are considered. In addition, a meta-analysis has been performed to estimate the impact of most common confounders on MN frequency, and to provide a baseline value of MN frequency in the control population.
RESULTS
A total number of 63 eligible studies were included in the analysis. Age (98.4%), gender (85.7%), and smoking habit (90.5%) were the most commonly studied confounders. Univariate statistics were estimated in most studies while multivariate analysis was applied only in the 47.6%. Baseline MN frequency in controls was 1.10/1000 cells (95% confidence interval 0.70-1.72), and the relative increment in subjects exposed to genotoxic agents or affected by disease correlated with similar observations in lymphocytes (R(2)=0.74). A minimum number of 4000 cells is recommended to reduce the variability of the MN mean estimates, in contrast with the current practice of scoring only 2000 cells (81% of studies). Poisson or Negative Binomial are the preferred statistical models when more than 2000 cells are scored. Studies scoring smaller numbers of cells should consider the use of statistical models taking into account the excess of zeros, e.g., the Zero Inflated Poisson (ZIP) models.
CONCLUSIONS
The quality of papers published on the buccal MN assay can be substantially improved, with better consideration of basic issues such as power analysis, control for confounding, choice of the statistical model, and the number of cells to be scored.
Topics: Age Factors; Confounding Factors, Epidemiologic; DNA Damage; Female; Humans; Male; Meta-Analysis as Topic; Micronucleus Tests; Models, Statistical; Mouth Mucosa; Population Surveillance; Sample Size
PubMed: 19932192
DOI: 10.1016/j.mrrev.2009.11.001 -
Reproductive Biomedicine Online Jun 2019Sperm DNA fragmentation (sDF) has emerged as a valuable tool for evaluating male fertility, yet the relationship between DNA fragmentation in the male gamete and... (Meta-Analysis)
Meta-Analysis
Sperm DNA fragmentation (sDF) has emerged as a valuable tool for evaluating male fertility, yet the relationship between DNA fragmentation in the male gamete and idiopathic recurrent pregnancy loss (RPL) remains a topic of ongoing debate. Hence, a meta-analysis was conducted of 12 prospective and 2 retrospective studies involving 530 men with a history of RPL who underwent sDF testing compared with 639 fertile control participants. The main outcome measures were sDF measured by comet assay, TdT (terminal deoxynucleotidyl transferase)-mediated dUDP nick-end labelling (TUNEL), sperm chromatin dispersion (SCD) or sperm chromatin structure assay. Overall, couples with a history of idiopathic RPL demonstrated higher levels of sDF than fertile couples (average mean difference 11.98, P < 0.001). Subgroup analysis demonstrated a similar average mean difference between the RPL and control groups using SCD compared with TUNEL, while mean paternal age and mean sperm motility in the RPL groups tested by meta-regression demonstrated no significant effect on the mean differences in sDF (P > 0.10). These results support the diagnostic value of sDF over standard semen analysis, as well as a possible paternally derived genetic origin of unexplained RPL. Further prospective studies are required to further assess the predictive utility of sDF for assessing couples with unexplained RPL.
Topics: Abortion, Habitual; Adult; Chromatin; Comet Assay; DNA Fragmentation; Female; Fertility; Humans; In Situ Nick-End Labeling; Male; Paternal Age; Pregnancy; Pregnancy Outcome; Regression Analysis; Semen Analysis; Sperm Motility; Spermatozoa
PubMed: 30979611
DOI: 10.1016/j.rbmo.2018.12.029 -
Environmental Science and Pollution... Dec 2021The aim of this review was to evaluate if micronucleus assay in oral exfoliated cells is a suitable tool for biomonitoring children exposed to environmental pollutants.... (Review)
Review
The aim of this review was to evaluate if micronucleus assay in oral exfoliated cells is a suitable tool for biomonitoring children exposed to environmental pollutants. Through the electronic databases PubMed/Medline, Scopus, and Web of Science, all published studies until April 2021 that examined the relationship between exposure to environmental pollutants and micronucleus frequency in oral cells were searched. All relevant articles using a combination of the following keywords-"children," "micronucleus," "oral cells," and "environmental pollution"-were considered. A total of 20 papers met the criteria for inclusion in the systematic review. The results regarding the cytogenetic damage induced by environmental pollutants are conflicting. Some authors have demonstrated that environmental pollution induces mutagenesis in oral cells while others did not. Following the parameters of the Project for Effective Public Health Practices (EPHPP) and after extensive reading of all the articles included, a total of 12 articles had moderate and strong scores and 8 had a classification considered weak. Taken together, this review was able to demonstrate the association between micronucleus frequency and exposure to environmental pollutants in oral exfoliated cells of children.
Topics: Biological Monitoring; Cell Nucleus; DNA Damage; Environmental Pollutants; Humans; Micronucleus Tests; Mouth Mucosa
PubMed: 34623589
DOI: 10.1007/s11356-021-16810-1