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Friedman, M.I. et al.

Friedman, Koch, Graczyk-Milbrandt, Ulrich, Osbakken,

High-fat diet prevents eating response and attenuates liver ATP decline in rats given 2,5-anhydro-D-mannitol.

Administration of the fructose analog 2,5-anhydro-D-mannitol (2,5-AM) stimulates eating in rats fed a low-fat diet but not in those fed a high-fat diet that enhances fatty acid oxidation. The eating response to 2,5-AM treatment is apparently triggered by a decrease in liver ATP content. To assess whether feeding a high-fat diet prevents the eating response to 2,5-AM by attenuating the decrease in liver ATP, we examined the effects of the analog on food intake, liver ATP content, and hepatic phosphate metabolism [using in vivo 31P-NMR spectroscopy (NMRS)]. Injection (intraperitoneal) of 300 mg/kg 2,5-AM increased food intake in rats fed a high-carbohydrate/low-fat diet, but not in those fed high-fat/low-carbohydrate (HF/LC) food. Liver ATP content decreased in all rats given 2,5-AM compared with saline, but it decreased about half as much in rats fed the HF/LC diet. NMRS on livers of anesthetized rats indicated that feeding the HF/LC diet attenuates the effects of 2,5-AM on liver ATP by reducing phosphate trapping. These results suggest that rats consuming a high-fat diet do not increase food intake after injection of 2,5-AM, because the analog is not sufficiently phosphorylated and therefore fails to decrease liver energy status below a level that generates a signal to eat.[1]

References

High-fat diet prevents eating response and attenuates liver ATP decline in rats given 2,5-anhydro-D-mannitol. Friedman, M.I., Koch, J.E., Graczyk-Milbrandt, G., Ulrich, P.M., Osbakken, M.D. Am. J. Physiol. Regul. Integr. Comp. Physiol. (2002) [Pubmed]

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