The Metabolic Effects of Low Grade Inflammation on Postprandial Metabolism Following a High Fat Meal
Pittman, Joshua Taylor
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Inflammation is a central feature of various metabolic diseases including obesity and type-II diabetes. For this study, we hypothesized postprandial metabolism following an acute, high fat (HF) meal to be impaired in mice pre-injected with an inflammatory agonist. To this end, C57BL/6J mice were injected with saline or lipopolysaccharide (LPS, 1μg/kgbw) following an overnight fast and gavaged 2hr post-injection with water or a HF meal in liquid form (5kcal; 21.4%SF, 40.8%UF, 27.1%CHO, 10.7%PRO). Blood and muscle samples taken 3hr post-gavage underwent ex vivo analysis. Overall, results demonstrated a metabolic response to a HF meal that was blocked in the presence of LPS. Metabolic flexibility, though unchanged following the HF meal alone, was reduced following the HF meal in the presence of LPS. Additionally, state-4 uncoupled mitochondrial respiration, which was increased following the HF meal, was also reduced following the HF meal in the presence of LPS. Similar near-significant trends were also observed with total palmitate oxidation. Although no independent response to a HF meal or LPS exposure was observed, a unique interaction between treatments significantly diminished ADP dependent, state-3 and maximal respiration. These effects do not appear to be dependent on the production of reactive oxygen species (ROS) since neither the HF meal nor LPS exposure resulted in increased production of ROS. In conclusion, these results demonstrate that acute activation of inflammatory pathways results in alterations in metabolic response to a HF meal in skeletal muscle from mice, although the mechanism underlying these effects is not yet understood.
- Masters Theses