Divergent effects of a CLA-enriched beef diet on metabolic health in ApoE-/- and ob/ob mice
Reynolds, CM; Toomey, S; Mcbride, R; Mcmonagle, J; Morine, MJ; Belton, O; Moloney, AP; Roche, HM
| HERO ID | 2902979 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Divergent effects of a CLA-enriched beef diet on metabolic health in ApoE-/- and ob/ob mice |
| Authors | Reynolds, CM; Toomey, S; Mcbride, R; Mcmonagle, J; Morine, MJ; Belton, O; Moloney, AP; Roche, HM |
| Journal | Journal of Nutritional Biochemistry |
| Volume | 24 |
| Issue | 2 |
| Page Numbers | 401-411 |
| Abstract | Conjugated linoleic acid (CLA) is found naturally in meat and dairy products, and represents a potential therapeutic functional nutrient. However, given the discrepancies in isomer composition and concentration, controversy surrounds its proposed antidiabetic, antiobesity effects. This study focused on the effects of CLA-enriched beef (composed predominantly of c9, t11-CLA) in two separate models of metabolic disease: proatherosclerotic ApoE(-/-) mice and diabetic, leptin-deficient ob/ob mice. Animals were fed CLA-enriched beef for 28 days, and markers of the metabolic syndrome and atherosclerosis were assessed. Comprehensive hepatic transcriptomic analysis was completed to understand divergent metabolic effects of CLA. CLA-enriched beef significantly reduced plasma glucose, insulin, nonesterified fatty acid and triacylglycerol and increased adiponectin levels in ob/ob mice. In contrast, plasma lipid profiles and glucose homeostasis deteriorated and promoted atherosclerosis following the CLA-enriched beef diet in ApoE(-/-) mice. Hepatic transcriptomic profiling revealed divergent effects of CLA-enriched beef on insulin signaling and lipogenic pathways, which were adversely affected in ApoE(-/-) mice. This study demonstrated clear divergence in the effects of CLA. CLA-enriched beef improved metabolic flexibility in ob/ob mice, resulting in enhanced insulin sensitivity. However, CLA-enriched diet increased expression of lipogenic genes, resulting in inefficient fatty acid storage which increases lipotoxicity in peripheral organs, and led to profound metabolic dysfunction in ApoE(-/-) mice. While CLA may have potential health effects, in some circumstances, caution must be exercised in presenting this bioactive lipid as a potential functional food for the treatment of metabolic disease. |
| Doi | 10.1016/j.jnutbio.2011.12.006 |
| Pmid | 22626767 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |