Suppression of glycogen synthesis as a treatment for Lafora disease: Establishing the window of opportunity
Lafora disease (LD) is a fatal adolescence-onset neurodegenerative condition. The hallmark of LD is the accumulation of aberrant glycogen aggregates called Lafora bodies (LBs) in the brain and other tissues. Impeding glycogen synthesis from early embryonic stages by genetic suppression of glycogen s...
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Published in | Neurobiology of disease Vol. 147; p. 105173 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier Inc
01.01.2021
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Lafora disease (LD) is a fatal adolescence-onset neurodegenerative condition. The hallmark of LD is the accumulation of aberrant glycogen aggregates called Lafora bodies (LBs) in the brain and other tissues. Impeding glycogen synthesis from early embryonic stages by genetic suppression of glycogen synthase (MGS) in an animal model of LD prevents LB formation and ultimately the pathological manifestations of LD thereby indicating that LBs are responsible for the pathophysiology of the disease. However, it is not clear whether eliminating glycogen synthesis in an adult animal after LBs have already formed would halt or reverse the progression of LD.
Herein we generated a mouse model of LD with inducible MGS suppression. We evaluated the effect of MGS suppression at different time points on LB accumulation as well as on the appearance of neuroinflammation, a pathologic trait of LD models.
In the skeletal muscle, MGS suppression in adult LD mice blocked the formation of new LBs and reduced the number of glycogen aggregates. In the brain, early but not late MGS suppression halted the accumulation of LBs. However, the neuroinflammatory response was still present, as shown by the levels of reactive astrocytes, microglia and inflammatory cytokines.
Our results confirm that MGS as a promising therapeutic target for LD and highlight the importance of an early diagnosis for effective treatment of the disease.
•Early suppression of glycogen synthase arrests the accumulation of Lafora bodies in the brain of Lafora disease model.•Early suppression of glycogen synthase greatly reduces Lafora bodies in muscle of Lafora disease model.•Glycogen synthase suppression at the time points tested is insufficient to prevent the appearance of neuroinflammation.•·An early Lafora disease-genetic diagnosis is crucial for the efficiency of glycogen synthase-based therapeutic approaches. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Olga Varea: Conceptualization, Investigation, Methodology, Writing-original draft prepapation; Jordi Duran: Conceptualization, Investigation, Methodology, Writing-Review and Editing; Mònica Aguilera: Methodology, Investigation, Writing-Review and Editing; Neus Prats: Methodology, Writing-Review and Editing; Joan J. Guinovart: Conceptualization, Writing-Review and Editing, Supervision, Project administration. All authors have read and approved the manuscript. Credit Author Statement. |
ISSN: | 0969-9961 1095-953X |
DOI: | 10.1016/j.nbd.2020.105173 |