Alteration of mitochondrial function in the livers of mice with glycogen branching enzyme deficiency

Biochimie. 2021 Apr 12:S0300-9084(21)00098-5. doi: 10.1016/j.biochi.2021.04.001. Online ahead of print.ABSTRACTGlycogen storage disease type IV (GSD IV) is caused by mutations in the glycogen branching enzyme gene (GBE1) that lead to the accumulation of aberrant glycogen in affected tissues, mostly in the liver. To determine whether dysfunctional glycogen metabolism in GSD IV affects other components of cellular bioenergetics, we studied mitochondrial function in heterozygous Gbe1 knockout (Gbe1+/-) mice. Mitochondria isolated from the livers of Gbe1+/- mice showed elevated respiratory complex I activity and increased reactive oxygen species production, particularly by respiratory chain complex III. These observations indicate that GBE1 deficiency leads to broader rearrangements in energy metabolism and that the mechanisms underlying GSD IV pathogenesis may include more than merely mechanical cell damage caused by the presence of glycogen aggregates.PMID:33857563 | DOI:10.1016/j.biochi.2021.04.001

Source: Biochimie - April 15, 2021 Category: Biochemistry Authors: Dominika Malinska Giorgia Testoni Malgorzata Bejtka Jordi Duran Joan J Guinovart Jerzy Duszynski Source Type: research