Abstract
Oleoyl-estrone given i.v. – incorporated in liposomes to mimic lipoprotein delivery – (Merlin-2) to normal weight rats, induces a dose-dependent weight loss. Analysis of body composition showed that body protein concentration was preserved and fat stores wasted. The respiratory quotient was consistent with the massive oxidation of body fat, since the diet contained practically no lipid. Appetite was affected by Merlin-2, and thus food intake showed a transient decrease. But oxygen consumption (and basal metabolic rates) was kept practically unchanged at the levels of the controls, i. e. higher than needed to oxidize the food ingested during the weight loss period. Brown adipose tissue uncoupling protein levels were proportionally preserved with a 2-week treatment, but it lost a substantial amount of lipid. In conclusion, Merlin-2 is a slimming agent with considerable potential given its powerful fat-wasting action, since it maintains thermogenesis despite lowered energy intake.
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