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CS-045, a new oral antidiabetic agent, stimulates fructose-2,6-bisphosphate production in rat hepatocytes.

Abstract：

:Fructose-2,6-bisphosphate is a potent activator of 6-phosphofructo-1-kinase, a key enzyme in glycolysis. We previously revealed that sulfonylureas stimulate fructose-2,6-bisphosphate production in the rat liver by activating 6-phosphofructo-2-kinase. In the present study, we show that CS-045, a new antidiabetic agent, activated 6-phosphofructo-2-kinase and raised fructose-2,6-bisphosphate levels in dispersed rat hepatocytes. This action was time- and dose-dependent. Ten micromolar CS-045 raised the fructose-2,6-bisphosphate content linearly to the submaximal level in 20 min. Dose dependency was observed in the range of 1-30 microM. Thirty micromolar CS-045 completely reversed the inhibitory effect of 0.1 nM glucagon on fructose-2,6-bisphosphate production. CS-045 activated 6-phosphofructo-2-kinase by decreasing the Km value for the substrate (fructose-6-phosphate) without affecting the Vmax. The combination of suboptimal doses of CS-045 and tolbutamide increased fructose-2,6-bisphosphate content more than that induced by each agent alone. These results indicate that CS-045 may reduce plasma glucose by facilitating glycolysis in the liver.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Murano K,Inoue Y,Emoto M,Kaku K,Kaneko T

doi

10.1016/0014-2999(94)90462-6

subject

Has Abstract

pub_date

1994-03-21 00:00:00

pages

257-62

issue

3

eissn

0014-2999

issn

1879-0712

pii

0014-2999(94)90462-6

journal_volume

254

pub_type

杂志文章

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