Influence of a High Cholesterol Regime on Epicardial and Subcutaneous Adipose Tissue Fatty Acids Profile in Rabbits

Background: We have shown that the fatty acid profile of epicardial adipose tissue (EAT) in patients with obstructed coronary vessels is different from that of the subcutaneous adipose tissue (SAT). The diversity and amount of fatty acids in the adipose tissue can be affected by the component of the lipids in diet. As a result, this study investigated the influence of a high cholesterol regime on EAT and subcutaneous adipose tissue fatty acids profile in rabbits. Methods: Sixteen New Zealand white rabbits were randomly divided into two equal groups. The control group received a normal standard diet, whereas the test group was fed with the high cholesterol regime for 2 months. At the end of this period, the rabbits were anesthetized, 1-5mg of EAT and SAT were removed, and their fatty acids content was determined. Results: The high cholesterol regime caused a significant increase in low-density lipoprotein (LDL) and triglycerides levels and a marked decrease in high-density lipoprotein (HDL) concentration. After 2 months, in the EAT, fatty acids 16:0 and 18:1t and saturated fatty acid (SFA) showed a significant increase (P < 0.05), whereas, fatty acids 12:0, 18:1, 18:2, and 18:3, monounsaturated fatty acid (MUFA), polyunsaturated fatty acid (PUFA), omega 3, and omega 6 had a significant decrease (P < 0.05). In SAT, fatty acids 18:3, 20:4, 22:6, MUFA, and omega 3 decreased and PUFA, SFA, and omega 6 significantly increased (P < 0.05). Conclusion: Consumption of a high cholesterol regime for 2 months resulted in a significant increase in atherogenic fatty acids and a decrease in antiatherogenic ones in the EAT. EAT is very sensitive to lipid changes of the regime comparing to SAT.