Abstract
Background
Glycogen storage disease type I (GSDI) is an inborn error of carbohydrate metabolism caused by mutations of either the G6PC gene (GSDIa) or the SLC37A4 gene (GSDIb). GSDIa patients are at higher risk of developing insulin-resistance (IR). Mitochondrial dysfunction has been implicated in the development of IR. Mitochondrial dysfunction can demonstrate abnormalities in plama acylcarnitines (ACs) and urine organic acids (UOA). The aim of the study was to investigate the presence of mitochondrial impairment in GSDI patients and its possible connection with IR.
Methods
Fourteen GSDIa, seven GSDIb patients, 28 and 14 age and sex-matched controls, were enrolled. Plasma ACs, UOA, and surrogate markers of IR (HOMA-IR, QUICKI, ISI, VAI) were measured.
Results
GSDIa patients showed higher short-chain ACs and long-chain ACs levels and increased urinary excretion of lactate, pyruvate, 2-ketoglutarate, 3-methylglutaconate, adipate, suberate, aconitate, ethylmalonate, fumarate, malate, sebacate, 4-octenedioate, 3OH-suberate, and 3-methylglutarate than controls (p < 0.05). GSDIb patients showed higher C0 and C4 levels and increased urinary excretion of lactate, 3-methylglutarate and suberate than controls (p < 0.05). In GSDIa patients C18 levels correlated with insulin serum levels, HOMA-IR, QUICKI, and ISI; long-chain ACs levels correlated with cholesterol, triglycerides, ALT serum levels, and VAI.
Discussion
Increased plasma ACs and abnormal UOA profile suggest mitochondrial impairment in GSDIa. Correlation data suggest a possible connection between mitochondrial impairment and IR. We hypothesized that mitochondrial overload might generate by-products potentially affecting the insulin signaling pathway, leading to IR. On the basis of the available data, the possible pathomechanism for IR in GSDIa is proposed.
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Abbreviations
- ACs:
-
Plasma acylcarnitines
- C0:
-
Free carnitine
- C2:
-
Acetylcarnitine
- C3:
-
Propionylcarnitine
- C3DC:
-
Malonylcarnitine
- C4:
-
Butyrylcarnitine
- C4DC:
-
Methylmalonylcarnitine
- C5:
-
Isovalerylcarnitine
- C5DC:
-
Glutarylcarnitine
- C5:1:
-
Tiglylcarnitine
- C5OH:
-
3OH-Isovalerylcarnitine
- C6:
-
Hexanoylcarnitine
- C6DC:
-
Adipylcarnitine
- C8:
-
Octanoylcarnitine
- C8:1:
-
Octeneylcarnitine
- C10:
-
Decanoylcarnitine
- C10:1:
-
Decenoylcarnitine
- C12:
-
Dodecanoylcarnitine
- C12:1:
-
Dodecenoylcarnitine
- C14:
-
Miristoylcarnitine
- C14:1:
-
Tetradecenoylcarnitine
- C14:2:
-
Tetradecadienoylcarnitine
- C16:
-
Palmitoylcarnitine
- C16:1:
-
Esadecenoylcarnitine
- C16OH:
-
3OH-Esadecanoylcarnitine
- C18:
-
Stearoylcarnitine
- C18:1:
-
Oleylcarnitine
- C18:1OH:
-
3OH-Oleycarnitine
- CNGF:
-
Nocturnal gastric drip feeding
- FAO:
-
Fatty acid oxidation
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- IBD:
-
Inflammatory bowel disease
- IR:
-
Insulin-resistance
- ISI:
-
Insulin sensitivity index
- QUICKI:
-
Quantitative insulin sensitivity check index
- PPP:
-
Pentose phosphate pathway
- TCA cycle:
-
Tricarboxylic acid cycle
- UCCS:
-
Uncooked cornstarch
- UOA:
-
Urine organic acids
- VAI:
-
Visceral adiposity index
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients (or their legal guardians) for being included in the study.
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Communicated by: Verena Peters
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Rossi, A., Ruoppolo, M., Formisano, P. et al. Insulin-resistance in glycogen storage disease type Ia: linking carbohydrates and mitochondria?. J Inherit Metab Dis 41, 985–995 (2018). https://doi.org/10.1007/s10545-018-0149-4
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DOI: https://doi.org/10.1007/s10545-018-0149-4