Abstract | OBJECTIVE: DESIGN: The rats were fed for 15 days with a powdered hyperlipidic diet (16.97 MJ/kg metabolizable energy) in which 46.6% was lipid-derived and 16.1% protein-derived energy (HL group), containing 1.23+/-0.39micromol/kg of fatty-acyl esters of estrone. This diet was supplemented with additional oleoyl-estrone to produce diets with 2.5 micromol/kg (diet OE2.5), 4.4 micromol/kg (diet OE4.4), and 33.3 micromol/kg content in fatty-acyl estrone (diet OE33). SUBJECTS: Twelve-week old female Zucker lean (Fa/?) rats initially weighing 200-235g. MEASUREMENTS: RESULTS:
Oral administration of oleoyl-estrone in a hyperlipidic diet resulted in significant losses of fat, energy and, ultimately, weight, which were dependent on the dose of oleoyl-estrone ingested. Treatment induced the maintenance of energy expenditure combined with lower food intake, creating an energy gap that was filled with internal fat stores whilst preserving body protein. The decrease in food intake was not a consequence of food aversion but of diminished appetite. Energy expenditure was practically constant for all groups except for the OE33, which showed values about 25% lower than the controls. In most of the groups studied, there was a net protein deposition in spite of severe lipid and energy drainage. Amino acid levels agreed with this N-sparing shift. In spite of lowered energy intake, the N balance was positive or near zero in all groups, with a sizeable N-gap in controls and in lower-dose groups that disappeared in the OE33 group. CONCLUSION: Treatment of rats with a hyperlipidic diet containing added oleoyl-estrone resulted in the dose-related loss of fat reserves with scant modification of other metabolic parameters and preservation of body protein. The results agree with the postulated role of oleoyl-estrone as a ponderostat signal and open the way for its development as anti-obesity drug.
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Authors | X Remesar, P Guijarro, C Torregrosa, M M Grasa, J López, J A Fernández-López, M Alemany |
Journal | International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity
(Int J Obes Relat Metab Disord)
Vol. 24
Issue 11
Pg. 1405-12
(Nov 2000)
England |
PMID | 11126335
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Amino Acids
- Anti-Obesity Agents
- Dietary Fats
- Oleic Acids
- Proteins
- Estrone
- oleoyl-estrone
- Nitrogen
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Topics |
- Adipose Tissue
(drug effects)
- Administration, Oral
- Amino Acids
(blood)
- Animals
- Anti-Obesity Agents
(administration & dosage, pharmacology)
- Body Composition
(drug effects)
- Body Weight
(drug effects)
- Diet
(adverse effects)
- Dietary Fats
(administration & dosage)
- Dose-Response Relationship, Drug
- Energy Intake
(drug effects)
- Energy Metabolism
(drug effects)
- Estrone
(administration & dosage, analogs & derivatives, metabolism, pharmacology)
- Female
- Nitrogen
(metabolism)
- Obesity
(drug therapy, metabolism)
- Oleic Acids
(administration & dosage, pharmacology)
- Proteins
(metabolism)
- Rats
- Rats, Zucker
- Time Factors
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