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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2015 ; 6
(ä): 8283
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Class III PI3K regulates organismal glucose homeostasis by providing negative
feedback on hepatic insulin signalling
#MMPMID26387534
Nemazanyy I
; Montagnac G
; Russell RC
; Morzyglod L
; Burnol AF
; Guan KL
; Pende M
; Panasyuk G
Nat Commun
2015[Sep]; 6
(ä): 8283
PMID26387534
show ga
Defective hepatic insulin receptor (IR) signalling is a pathogenic manifestation
of metabolic disorders including obesity and diabetes. The endo/lysosomal
trafficking system may coordinate insulin action and nutrient homeostasis by
endocytosis of IR and the autophagic control of intracellular nutrient levels.
Here we show that class III PI3K--a master regulator of endocytosis, endosomal
sorting and autophagy--provides negative feedback on hepatic insulin signalling.
The ultraviolet radiation resistance-associated gene protein (UVRAG)-associated
class III PI3K complex interacts with IR and is stimulated by insulin treatment.
Acute and chronic depletion of hepatic Vps15, the regulatory subunit of class III
PI3K, increases insulin sensitivity and Akt signalling, an effect that requires
functional IR. This is reflected by FoxO1-dependent transcriptional defects and
blunted gluconeogenesis in Vps15 mutant cells. On depletion of Vps15, the
metabolic syndrome in genetic and diet-induced models of insulin resistance and
diabetes is alleviated. Thus, feedback regulation of IR trafficking and function
by class III PI3K may be a therapeutic target in metabolic conditions of insulin
resistance.