http://physrev.physiology.org/content/90/1/23.abstract
direi un articolo completo. Interessante che parte del fruttosio sia convertita in lattato.
c'é un'altro punto di regolazione da parte del F1P sul metabolismo del glucosio epatico.
Hepatic glucokinase is a
key regulatory enzyme in hepatic glucose metabolism,
since it is required for the formation of glucose-6-P. Decreased
activity of glucokinase secondary to heterozygous
mutations indeed leads to decreased postprandial
hepatic glycogen synthesis (232). Glucokinase also acts as
a liver sensor for glycemia and is involved in the inhibition
of hepatic glucose release by portal hyperglycemia, a
process which is also impaired in patients with glucokinase
mutations (203). Glucokinase activity is controlled
by the concentration of its substrate glucose and by a
regulatory protein, which acts as a competitive inhibitor
of glucose for glucokinase. Fructose-1-P, at low concentration,
antagonizes glucokinase regulatory protein, thus
enhancing glucokinase activity (229). As a consequence,
addition of small, so-called “catalytic” doses of fructose to
a glucose meal can enhance hepatic glucose disposal (69).
direi un articolo completo. Interessante che parte del fruttosio sia convertita in lattato.
c'é un'altro punto di regolazione da parte del F1P sul metabolismo del glucosio epatico.
Hepatic glucokinase is a
key regulatory enzyme in hepatic glucose metabolism,
since it is required for the formation of glucose-6-P. Decreased
activity of glucokinase secondary to heterozygous
mutations indeed leads to decreased postprandial
hepatic glycogen synthesis (232). Glucokinase also acts as
a liver sensor for glycemia and is involved in the inhibition
of hepatic glucose release by portal hyperglycemia, a
process which is also impaired in patients with glucokinase
mutations (203). Glucokinase activity is controlled
by the concentration of its substrate glucose and by a
regulatory protein, which acts as a competitive inhibitor
of glucose for glucokinase. Fructose-1-P, at low concentration,
antagonizes glucokinase regulatory protein, thus
enhancing glucokinase activity (229). As a consequence,
addition of small, so-called “catalytic” doses of fructose to
a glucose meal can enhance hepatic glucose disposal (69).