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Glycogen storage disease type 1a is associated with disturbed vitamin A metabolism and elevated serum retinol levels.

Abstract：

:Glycogen storage disease type 1a (GSD Ia) is an inborn error of metabolism caused by mutations in the G6PC gene, encoding the catalytic subunit of glucose-6-phosphatase. Early symptoms include severe fasting intolerance, failure to thrive and hepatomegaly, biochemically associated with nonketotic hypoglycemia, fasting hyperlactidemia, hyperuricemia and hyperlipidemia. Dietary management is the cornerstone of treatment aiming at maintaining euglycemia, prevention of secondary metabolic perturbations and long-term complications, including liver (hepatocellular adenomas and carcinomas), kidney and bone disease (hypovitaminosis D and osteoporosis). As impaired vitamin A homeostasis also associates with similar symptoms and is coordinated by the liver, we here analysed whether vitamin A metabolism is affected in GSD Ia patients and liver-specific G6pc-/- knock-out mice. Serum levels of retinol and retinol binding protein 4 (RBP4) were significantly increased in both GSD Ia patients and L-G6pc-/- mice. In contrast, hepatic retinol levels were significantly reduced in L-G6pc-/- mice, while hepatic retinyl palmitate (vitamin A storage form) and RBP4 levels were not altered. Transcript and protein analyses indicate an enhanced production of retinol and reduced conversion the retinoic acids (unchanged LRAT, Pnpla2/ATGL and Pnpla3 up, Cyp26a1 down) in L-G6pc-/- mice. Aberrant expression of genes involved in vitamin A metabolism was associated with reduced basal messenger RNA levels of markers of inflammation (Cd68, Tnfα, Nos2, Il-6) and fibrosis (Col1a1, Acta2, Tgfβ, Timp1) in livers of L-G6pc-/- mice. In conclusion, GSD Ia is associated with elevated serum retinol and RBP4 levels, which may contribute to disease symptoms, including osteoporosis and hepatic steatosis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Saeed A,Hoogerland JA,Wessel H,Heegsma J,Derks TGJ,van der Veer E,Mithieux G,Rajas F,Oosterveer MH,Faber KN

doi

10.1093/hmg/ddz283

subject

Has Abstract

pub_date

2020-01-15 00:00:00

pages

264-273

issue

2

eissn

0964-6906

issn

1460-2083

pii

5650454

journal_volume

29

pub_type

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