Short-term oleoyl-estrone treatment affects capacity to manage lipids in rat adipose tissue

Abstract

Background: Short-term OE (oleoyl-estrone) treatment causes significant decreases in rat weight mainly due to adipose tissue loss. The aim of this work was to determine if OE treatment affects the expression of genes that regulate lipid metabolism in white adipose tissue.

Results: Gene expression in adipose tissue from female treated rats (48 hours) was analysed by hybridization to cDNA arrays and levels of specific mRNAs were determined by real-time PCR. Treatment with OE decreased the expression of 232 genes and up-regulated 75 other genes in mesenteric white adipose tissue. The use of real-time PCR validate that, in mesenteric white adipose tissue, mRNA levels for Lipoprotein Lipase (LPL) were decreased by 52%, those of Fatty Acid Synthase (FAS) by 95%, those of Hormone Sensible Lipase (HSL) by 32%, those of Acetyl CoA Carboxylase (ACC) by 92%, those of Carnitine Palmitoyltransferase 1b (CPT1b) by 45%, and those of Fatty Acid Transport Protein 1 (FATP1) and Adipocyte Fatty Acid Binding Protein (FABP4) by 52% and 49%, respectively. Conversely, Tumour Necrosis Factor (TNFalpha) values showed overexpression (198%).

Conclusion: Short-term treatment with OE affects adipose tissue capacity to extract fatty acids from lipoproteins and to deal with fatty acid transport and metabolism.

Figure 1

Quantization of HSL, ACC, FAS, and CPT1b by real-time PCR in samples of mesenteric white adipose tissue of treated rats during 48-hours with OE. The results express the levels of mRNA, corrected by cyclophilin values and expressed as a percentage of controls. Results express the means ± SEM of 4 different experiments. Asterisks indicate differences from controls: * P < 0.05.

Figure 2

Quantization of LPL, FABP4, FATP1 and TNFα by real-time PCR in samples of mesenteric white adipose tissue of treated rats during 48-hours with OE. The results express the levels of mRNA, corrected by cyclophilin values and expressed as a percentage of controls. Results express the means ± SEM of 4 different experiments. Asterisks indicate differences from controls: * P < 0.05.