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Cell signalling of the GLP-1 action in rat liver.

Abstract：

:GLP-1, incretin with insulin-independent antidiabetic properties, is insulinomimetic upon glucose metabolism in extrapancreatic tissues, acting through specific receptors not associated to adenylate cyclase activation. We investigated the role of enzymes mediating insulin actions, in the GLP-1-induced glycogen synthase a activation in rat hepatocytes. GLP-1, like insulin, activates PI3K/PKB, p70s6k, p44 and p42 MAP-kinase. Wortmannin (PI3K/PKB inhibitor) blocked the stimulatory action of insulin on glycogen synthase a and reduced that of GLP-1; rapamycin (p70s6k inhibitor) was ineffective and PD98059 (MEK/MAPK inhibitor) decreased only the insulin effect; okadaic acid (PP-2A inhibitor) was ineffective, while TNFalpha (PP-1 inhibitor) blocked the action of insulin and reduced that of GLP-1; H-7 or Ro 31-8220 (PKC inhibitors) decreased the GLP-1 effect, while only H-7 reduced that of insulin. The activation of PI3K/PKB, PKC and PP-1, but not PP-2A, seems to mediate the GLP-1 stimulatory action on glycogen synthase a in rat hepatocytes, while MAPKs and p70s6k could participate in other GLP-1 effects.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Redondo A,Trigo MV,Acitores A,Valverde I,Villanueva-Peñacarrillo ML

doi

10.1016/s0303-7207(03)00146-1

keywords:

subject

Has Abstract

pub_date

2003-06-30 00:00:00

pages

43-50

issue

1-2

eissn

0303-7207

issn

1872-8057

pii

S0303720703001461

journal_volume

204

pub_type

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