Obesity is associated with a decrease in expression but not with the hypermethylation of thermogenesis-related genes in adipose tissues

Journal of Translational Medicine

Monika Puzianowska-Kuznicka³  Andrzej Chmura²  Zbigniew Wierzbicki²  Zofia Agnieszka Wicik¹  Maurycy Jonas²  Wojciech Lisik²  Marta Jonas¹  Alina Kurylowicz¹ 

[1] Department of Human Epigenetics, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego Street, Warsaw, 02-106, Poland;Department of General and Transplantation Surgery, Medical University of Warsaw, 59 Nowogrodzka Street, Warsaw, 02-005, Poland;Department of Geriatrics and Gerontology, Medical Centre of Postgraduate Education, 99 Marymoncka Street, Warsaw, 01-813, Poland

关键词: Methylation;    Uncoupling proteins;    5’-iodothyronine deiodinases;    Thyroid hormone receptors;    Adrenergic receptors;    Obesity;   

Others  :  1137698
DOI  :  10.1186/s12967-015-0395-2

 received in 2014-09-22, accepted in 2015-01-14,  发布年份 2015

【 摘 要 】

Background

Impaired thermogenesis can promote obesity. Therefore, the aim of this study was to investigate whether the expression of thermogenesis-related genes is altered in adipose tissues of obese individuals and whether excessive methylation of their promoters is involved in this phenomenon.

Methods

The expression of genes encoding β adrenergic receptors (ADRBs), thyroid hormone receptors (THRs), 5’-iodothyronine deiodinases (DIOs), and uncoupling proteins (UCPs) was measured by real-time PCR in visceral and in subcutaneous adipose tissues of 58 obese (BMI >40 kg/m²) and 50 slim (BMI 20-24.9 kg/m²) individuals. The methylation status of these genes was studied by the methylation-sensitive digestion/real-time PCR method.

Results

The expression of ADRB2, ADRB3, THRA, THRB, DIO2, UCP2 was significantly lower in the adipose tissues of obese patients than in tissues of normal-weight individuals (P < 0.00001). In the obese, the expression of ADRB2, ADRB3, DIO2 was lower in visceral adipose tissue than in subcutaneous adipose tissue (P = 0.008, P = 0.002, P = 0.001, respectively). However, the mean methylation of CpG islands of these genes was similar in tissues with their high and low expression, and there was no correlation between the level of expression and the level of methylation.

Conclusions

Decreased expression of thermogenesis-related genes in adipose tissues of obese patients might result in the reduced reactivity to both hormonal and adrenergic stimuli and therefore in a lower potential to activate thermogenesis.

【 授权许可】

   
2015 Kurylowicz et al.; licensee BioMed Central.

【 图 表 】

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