ISSN: 1899-1955
Human Movement
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4/2018
vol. 19
 
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abstract:
Original paper

VO2max is uncorrelated with the PRKAA2 gene methylation, but influences the glucose-insulin correlation

Anderson Vulczak, Marcos R. Queiroga, Emerson Carraro, Lin-Hui T. Wang, Paula H.O. Lima, Jéssica C. Dos Santos, Gabriela Pereira-Da-Silva, Mario H. Hirata, Marco A. Romano

Human Movement 2018 vol. 19 (4), 56-63
Online publish date: 2018/10/09
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Purpose
Cardiovascular fitness (maximal oxygen uptake [VO2max]) is linked with health indicators and the α2 subunit of the AMP-activated protein kinase (AMPKα2), encoded by the PRKAA2 gene, is an important metabolic sensor and can mediate part of exercise effect. It has been proposed that changes in the metabolic process bound with exercise might occur through epigenetic regulations. However, how VO2max can influence the epigenetic mechanism and consequently health is still unknown. The aim of this study was to investigate the PRKAA2 gene methylation profile and its relation to metabolic variables in normoglycemic monozygotic twins discordant for VO2max.

Methods
Nine pairs of monozygotic twins were studied, with the intra-pair VO2max difference >10 ml • kg–1 • min–1. An oral glucose tolerance test was used, and blood samples were collected for biochemical and DNA methylation analyses.

Results
No DNA methylation differences were observed between the groups. The low-cardiorespiratory-fitness group demonstrated a positive correlation between the methylation profile and low-density lipoprotein (CpG1, r = 0.714) and total cholesterol (CpG1, r = 0.723; CpG3, r = 0.678). Only the high-cardiorespiratory-fitness group showed correlations between glucose and insulin variables.

Conclusions
Our data suggest a link between high cardiorespiratory fitness and glucose-insulin correlation. The results provide important insights for future studies about the mechanisms through which VO2max can influence glucose metabolism.

keywords:

exercise, glucose, methylation, PRKAA2, twins, VO2max

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