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Activation of AMPK was required for metformin's inhibitory effect on liver glucose production. AMPK is an enzyme that plays an important role in insulin signaling, whole-body energy balance, and the metabolism of glucose and [[lipid|fats]]. AMPK activation is required for an increase in the expression of [[small heterodimer partner]], which in turn inhibited the [[gene expression|expression]] of the hepatic gluconeogenic genes [[phosphoenolpyruvate carboxykinase]] and [[glucose 6-phosphatase]]. Metformin is frequently used in research along with [[AICA ribonucleotide]] as an AMPK agonist. The mechanism by which biguanides increase the activity of AMPK remains uncertain: metformin increases the concentration of [[cytosol]]ic [[adenosine monophosphate]] (AMP) (as opposed to a change in total AMP or total AMP/[[adenosine triphosphate]]) which could activate AMPK allosterically at high levels; a newer theory involves binding to [[PEN-2]]. Metformin inhibits cyclic AMP production, blocking the action of [[glucagon]], and thereby reducing fasting glucose levels. Metformin also induces a profound shift in the faecal microbial community profile in diabetic mice, and this may contribute to its mode of action possibly through an effect on [[glucagon-like peptide-1]] secretion.

Translations:Metformin/40/en - Revision history

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