Xavier, Danilo J.
Evangelista, Adriane F.
Foss-Freitas, Maria C.
Foss, Milton C.
Donadi, Eduardo A.
Passos, Geraldo A.
Sakamoto-Hojo, Elza T.
Total Authors: 8
 Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Genet, BR-14049900 Ribeirao Preto, SP - Brazil
 Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Internal Med, BR-14048900 Ribeirao Preto, SP - Brazil
 Univ Sao Paulo, Fac Dent Ribeirao Preto, Dept Morphol, Disciplines Genet & Mol Biol, BR-14040904 Ribeirao Preto, SP - Brazil
 Univ Sao Paulo, Fac Philosophy Sci & Letters Ribeirao Preto, Dept Biol, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 4
MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS;
Web of Science Citations:
The development of type 2 diabetes mellitus (T2D) is associated with a number of genetic and environmental factors. Hyperglycemia, a T2D hallmark, is related to several metabolic complications, comorbidities and increased DNA damage. However, the molecular alterations of a proper glucose control are still unclarified. In this study, we aimed to evaluate DNA damage (comet assay), as well as to compare the transcriptional expression (mRNA and miRNA analyzed by the microarray technique) displayed by peripheral blood mononuclear cells (PBMCs) from three distinct groups: hyperglycemic T2D patients (T2D-H, n = 14), non-hyperglycemic T2D patients (T2D-N, n = 15), and healthy non-diabetic individuals (n = 16). The comet assay revealed significantly (p < 0.05) higher levels of DNA damage in T2D-H group compared to both T2D-N and control groups, while a significant difference was not observed between the control and T2D-N groups. After bioinformatics analysis, the differentially expressed mRNAs were subjected to functional enrichment analysis (DAVID) and inflammatory response was among the enriched terms found when comparing T2D-N with controls and T2D-H with T2D-N. Concerning the gene set enrichment and gene set analyses, among the differentially expressed gene sets, three were of interest: regulation of DNA repair (T2D-H versus T2D-N), superoxide response (T2D-H versus control group), and response to endoplasmic reticulum stress (T2D-H versus control group). We also identified miRNAs related with T2D and hyperglycemia not yet associated with these conditions in the literature. Some of the differentially expressed mRNAs were among the predicted targets of the differentially expressed miRNAs. Our results showed the association of hyperglycemia with increased DNA damage and aberrant expression of miRNAs and genes related to several biological processes, such as inflammation, DNA repair, ROS production and antioxidant defense, highlighting the importance of proper glycemic control. Moreover, the transcriptional expression of miRNAs provided novel information for understanding the regulatory mechanisms involved in the T2D progression. (C) 2015 Elsevier B.V. All rights reserved. (AU)