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Hepatic glucose-6-phosphatase-α deficiency leads to metabolic reprogramming in glycogen storage disease type Ia.

Abstract：

:Glycogen storage disease type Ia (GSD-Ia) is caused by a deficiency in glucose-6-phosphatase-α (G6Pase-α or G6PC), a key enzyme in endogenous glucose production. This autosomal recessive disorder is characterized by impaired glucose homeostasis and long-term complications of hepatocellular adenoma/carcinoma (HCA/HCC). We have shown that hepatic G6Pase-α deficiency-mediated steatosis leads to defective autophagy that is frequently associated with carcinogenesis. We now show that hepatic G6Pase-α deficiency also leads to enhancement of hepatic glycolysis and hexose monophosphate shunt (HMS) that can contribute to hepatocarcinogenesis. The enhanced hepatic glycolysis is reflected by increased lactate accumulation, increased expression of many glycolytic enzymes, and elevated expression of c-Myc that stimulates glycolysis. The increased HMS is reflected by increased glucose-6-phosphate dehydrogenase activity and elevated production of NADPH and the reduced glutathione. We have previously shown that restoration of hepatic G6Pase-α expression in G6Pase-α-deficient liver corrects metabolic abnormalities, normalizes autophagy, and prevents HCA/HCC development in GSD-Ia. We now show that restoration of hepatic G6Pase-α expression normalizes both glycolysis and HMS in GSD-Ia. Moreover, the HCA/HCC lesions in L-G6pc-/- mice exhibit elevated levels of hexokinase 2 (HK2) and the M2 isoform of pyruvate kinase (PKM2) which play an important role in aerobic glycolysis and cancer cell proliferation. Taken together, hepatic G6Pase-α deficiency causes metabolic reprogramming, leading to enhanced glycolysis and elevated HMS that along with impaired autophagy can contribute to HCA/HCC development in GSD-Ia.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Cho JH,Kim GY,Mansfield BC,Chou JY

doi

10.1016/j.bbrc.2018.03.083

subject

Has Abstract

pub_date

2018-04-15 00:00:00

pages

925-931

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)30569-2

journal_volume

498

pub_type

杂志文章

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