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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Jul;80(14):4301–4305. doi: 10.1073/pnas.80.14.4301

Regulation of carbohydrate metabolism by 2,5-anhydro-D-mannitol.

P T Riquelme, M E Wernette-Hammond, N M Kneer, H A Lardy
PMCID: PMC384025  PMID: 6410389

Abstract

In hepatocytes isolated from fasted rats, 2,5-anhydromannitol inhibits gluconeogenesis from lactate plus pyruvate and from substrates that enter the gluconeogenic pathway as triose phosphate. This fructose analog has no effect, however, on gluconeogenesis from xylitol, a substrate that enters the pathway primarily as fructose 6-phosphate. The sensitivity of gluconeogenesis to 2,5-anhydromannitol depends on the substrate metabolized; concentrations of 2,5-anhydromannitol required for 50% inhibition increase in the order lactate plus pyruvate less than dihydroxyacetone less than glycerol less than sorbitol less than fructose. The inhibition by 2,5-anhydromannitol of gluconeogenesis from dihydroxyacetone is accompanied by an increase in lactate formation and by two distinct crossovers in gluconeogenic-glycolytic metabolite patterns-i.e., increases in pyruvate concentrations with decreases in phosphoenolpyruvate and increases in fructose-1,6-bisphosphate concentrations with little change in fructose 6-phosphate. In addition, 2,5-anhydromannitol blocks the ability of glucagon to stimulate gluconeogenesis and inhibit lactate production from dihydroxyacetone. 2,5-Anhydromannitol decreases cellular fructose 2,6-bisphosphate content in hepatocytes; therefore the effects of the fructose analog are not mediated by fructose 2,6-bisphosphate, a naturally occurring allosteric regulator. 2,5-Anhydromannitol also inhibits gluconeogenesis in hepatocytes isolated from fasted diabetic rats, but higher concentrations of the analog are required.

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Selected References

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