Adipose tissue distribution and quantification of PPARbeta/delta and PPARgamma1-3 mRNAs: discordant gene expression in subcutaneous, retroperitoneal and visceral adipose tissue of morbidly obese patients.
BACKGROUND
Adipose tissue (AT) metabolism is altered in obese subjects, and the reestablishment of energy homeostasis requires the identification and regulation of genes with altered patterns. The aim of this study was to compare mRNA expression of PPARbeta/delta and PPARgamma1-3 in morbidly obese and nonobese patients. The expression pattern of these receptors in various abdominal adipose tissues, subcutaneous (SAT), retroperitoneal (RAT) and visceral (VAT), was also evaluated.


METHODS
The AT depots were obtained by surgery. Total RNAs were extracted using TRIzol. PPARs reverse transcripts were determined by quantitative polymerase chain reaction (qRT-PCR).


RESULTS
The amounts of PPARP/8 mRNA in different depots of morbidly obese AT showed a significant decrease in VAT (P < 0.05). In the non-obese group, the level of PPARbeta/delta was higher in SAT (P < 0.05), but PPARgamma1-3 was not differentially expressed in obese and non-obese depots. When comparing obese and non-obese, the results revealed a decrease in PPARPbeta/delta expression in SAT (P = 0.058) and VAT (P = 0.094) of the morbidly obese. PPARgamma1-3 mRNA expression was increased significantly in SAT (P = 0.022) and decreased in RAT (P = 0.034) in morbidly obese subjects. PPARbeta/delta expression in SAT and VAT correlated negatively with hip size and insulin serum respectively. PPARgamma1-3 expression in RAT correlated negatively with waist and hip circumference and in VAT correlated positively with waist size.


CONCLUSIONS
The present study demonstrates that PPARbeta/delta and PPARgamma1-3 mRNAs are quantitatively different in AT of morbidly obese individuals compared to non-obese, and that PPARbeta/delta mRNA levels are characteristic for each AT depot.
Bortolotto
Josiane Woutheres
JW
Departamento de Bioquímica-UFRGS, PUCRS, Porto Alegre, Brazil.
Margis
Rogério
R
Ferreira
Angela Cristine Bersch
AC
Padoin
Alexandre Vontobel
AV
Mottin
Cláudio Cora
CC
Guaragna
Regina Maria
RM
D050154:Adiposity / Q000502:physiology; D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D050152:Intra-Abdominal Fat / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000235:genetics / Q000378:metabolism*; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism*; D048068:PPAR-beta / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D050151:Subcutaneous Fat / Q000378:metabolism*
D047495:PPAR gamma; D048068:PPAR-beta; D012333:RNA, Messenger