Increased malondialdehyde vs. reduced sirtuin 1 in relation with adiposity, atherogenicity and hematological indices in metabolic syndrome patients with and without prediabetes

Background: Sirtuin 1 (SIRT 1) and malondialdehyde (MDA) were implicated in metabolic syndrome (MetS) and type 2 diabetes mellitus (T2DM) pathophysiology. Aims and methods: This cross-sectional study aimed to investigate both SIRT 1 and MDA in 30 lean healthy control, 31 normoglycemic MetS subjects and 30 MetS-Pre/T2DM drug naive. Correlation studies were established for both biomarkers with adiposity indices [conicity index (CI), waist circumference (WC), weight-to-height (WHtR) ratio, weight-to-hip (WHR) ratio, hip circumference (HC), and body adiposity index (BAD], hematological indices [red cell distribution width (RDW), mean platelet volume (MPV), platelet-to-lymphcyte ratio (PLR), neutrophil-to-lymphocyte ratio (NLR), monocyte-to-lymphocyte ratio (MLR)] and atherogenicity indices (atherogenicity index of plasma (AIP = log(10)TG/HDL-C ratio), TC/HDL-C and LDL-C/HDL-C ratios]. Results: SIRT1 levels (ng/mL) were markedly lower in both MetS groups (2.12 +/- 0.06 and 2.32 +/- 0.19, respectively, vs. controls 4.73 +/- 0.15; P < 0.05). Conversely, a gradual increase in MDA levels (mu M) was attained (MetS 72 +/- 3.3 and MetS pre-T2DM 81 +/- 6.1 vs. controls 62 +/- 3.5; P > 0.05). A significant inverse MDA-SIRT1 relationship was observed (P = 0.006). SIRT1 correlated inversely with all the studied adiposity (WC: P < 0.001, HC: P < 0.001, WHR: P < 0.001, C-index: P < 0.001, BAI: P < 0.001) and atherogenicity indices (AIP: P < 0.001, TC/HDL-C: P < 0.001, LDL-C/HDL-C: P < 0.001) as well as MPV (P < 0.01). Whereas MDA directly with WHtR, CI and BAI (WC: P < 0.01, HC: P < 0.05, BMI: P < 001, WHtR: P < 0.001, C-index: P < 0.005, BAI: P < 0.01). Conclusion: The substantial variations and correlations emphasize a potential molecular role of SIRT1 and MDA in the pathophysiology of MetS and pre/T2DM. (C) 2018 Diabetes India. Published by Elsevier Ltd. All rights reserved.