Backgraund. Tick-borne encephalitis (TBE), one of the large-scale public health problems of the Siberian region, can cause significant cytogenetic damage in humans by stimulating oxidative stress. Active functioning of the detoxification system including enzymes of glutathione-S-transferase is intended to protect the genetic structure of cells in the body, while at the same time, there are studies showing the defective functioning of this system in individuals with obesity. Aims. Aim of this work is to study the longevity of term of TBE-induced cytogenetic damage in patients with different alleles of genes of glutathione-S-transferase, suffering from alimentary-constitutional obesity compared with the control. Materials and methods. We were examined 133 female residents of the northern areas of Tomsk region from 35 to 44 years old who were hospitalized for infection TBE at local medical clinics. All individials were divided into two subgroups. Patients of the 1st subgroup (control) had a body mass index (BMI) within 2126, the 2nd subgroup had BMI showing severe obesity (BMI 3545). Buccal cells for cytogenetic and molecular analysis were taken several times: 12 days after hospitalization, 1 week, 1 month, 3 months, and 6 months after beginning of the disease. Methods of immunoassay and polymerase chain reaction (PCR) was used to confirm the diagnosis of TBE. As an untreated control were examined 126 healthy female residents of the same age groups. All individuals signed informed consent. In the analysis of deletions in the genes GSTM1 and GSTT1 was used multiplex PCR. We studied at least 1000 epithelial buccal cells from each individual. Results. In patients with high BMI rates revealed a significant increase in the frequency of the buccal cells with cytogenetic damage, compared to the control group. TBE disease was significantly increased the frequency of the cytogenetically damaged cells in this group of patients. The cytogenetic aberrations persisted in their body for six months after hospitalization. In patients with normal BMI rates TBE induced significantly less changes. The recovery of normal cytogenetic status was observed in this group 3 months after hospitalization. Analysis of the glutathione-S-transferase gene variants showed that in TBE patients with normal BMI and non-active alleles of these genesthe frequency of micronucleated epithelial cellswere significantly increased compared to the patients with the activeGSTM1 (+) / GSTT1 (+)genes. In the patients with alimentary obesity such patterns were not observed. Conclusions. Thus,infection with TBE in patients with obesity induced significant increase in both the frequency of cytogenetically damaged cells and the longevity of their persistency in the body compared to these in control group. Polymorphisms in genes of glutathione-S-transferase had no significant effect on the indices.
BACKGROUND: Tick-borne encephalitis (TBE) is an acute viral disease with activation of oxidative stress and increasing in cytogenetic instability. Clinical symptoms of infectious diseases usually more severe in patients with type 2 diabetes mellitus (DM2), especially in the case of burden in the genotype of mutant variants of glutathione-S-transferase genes GSTM1 and GSTT1. AIMS: The aim of this study was to study the dynamics of the frequency of micronucleated cells in patients with acute TBE with concomitant DM2, depending on the burden of active and inactive variants of glutathione-S-transferase genes (GSTM1 and GSTT1) in the patients genotype. MATERIALS AND METHODS: Totally, samples to make micronucleus assay were obtained from 138 patients with febrile illness of acute TBE, 64 of whom were diagnosed with concomitant DM2 (groups 3 and 4). As control groups, 57 healthy individuals (control 1) and 61 patients with DM2 (control 2) were examined. The samples of buccal cells for the micronucleus assay were repeatedly obtained from the individuals on the first day of admission, and also after 1 week, 1, 3 and 6 months. Polymerase chain reaction was used to analyze the variants of the GSTM1 and GSTT1 genes. RESULTS: On the first days of the disease, significant increases in the frequency of micronucleated buccal cells were determined in all TBE patients as compared to controls 1 and 2 (P0.001). Significant increases in the frequency of micronucleated buccal cells was revealed in groups 3 and 4 of the TBE patients who were carriers of inactive variants of the GSTM1(0) and GSTT1(0) genes, as compared to the subgroup of TBE patients with active variants of these genes (P0.001). In all subgroups of TBE patients with concomitant DM2, the frequencies of micronucleated cells were significantly higher than in the subgroups of TBE patients without DM2 (P0.001). Study of the dynamics of the frequency of micronucleated buccal cells, as compared to the control, demonstrated that the highest and long-lasting (within 6 months) cytogenetical effects were maintained in the group of TBE patients with genotype GSTM1(0)/GSTT1 (0) and concomitant DM2. CONCLUSION: The most prolonged and highest increases in the frequencies of cytogenetically instable cells were determined in the group of acute TBE patients with concomitant DM2 who were carriers of the genotype with inactive variants of both GSTM1(0) and GSTT1(0) glutathione-S-transferase genes.
The aim of the study was to evaluate the association between the frequency of cytogenetically damaged lymphocytes, glutathione- S-transferase (GST) gene polymorphisms, and mercury concentrations in the peripheral blood of mercury industry workers as well as an non-exposed local population (control group) of Aktash village, the Republic of Altay. The venous blood samples were obtained from 184 workers and 156 controls for chromosome assay, mercury blood concentration analysis, and the GSTM1 and GSTT1 gene polymorphism assessment by a polymerase chain reaction approach. Statistical analyses were carried out using Student's t-test, one-way ANOVA, or linear multiple regression. We demonstrated a significant increase in the frequency of lymphocytes with aneuploidy and polyploidy in the workers as compared with the controls (p < 0.001). The highest levels of aneuploidal and polyploidal lymphocytes were determined in the subgroup of workers with double null GSTM1(0)/GSTT1(0) genotype (p
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.