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Increased SIRT3 combined with PARP inhibition rescues motor function of SBMA mice

Authors :
David R. Garcia Castro
Joseph R. Mazuk
Erin M. Heine
Daniel Simpson
R. Seth Pinches
Caroline Lozzi
Kathryn Hoffman
Phillip Morrin
Dylan Mathis
Maria V. Lebedev
Elyse Nissley
Kang Hoo Han
Tyler Farmer
Diane E. Merry
Qiang Tong
Maria Pennuto
Heather L. Montie
Source :
iScience, Vol 26, Iss 8, Pp 107375- (2023)
Publication Year :
2023
Publisher :
Elsevier, 2023.

Abstract

Summary: Spinal and bulbar muscular atrophy (SBMA) is a neuromuscular disease with substantial mitochondrial and metabolic dysfunctions. SBMA is caused by polyglutamine (polyQ) expansion in the androgen receptor (AR). Activating or increasing the NAD+-dependent deacetylase, SIRT3, reduced oxidative stress and death of cells modeling SBMA. However, increasing diminished SIRT3 in AR100Q mice failed to reduce acetylation of the SIRT3 target/antioxidant, SOD2, and had no effect on increased total acetylated peptides in quadriceps. Yet, overexpressing SIRT3 resulted in a trend of motor recovery, and corrected TCA cycle activity by decreasing acetylation of SIRT3 target proteins. We sought to boost blunted SIRT3 activity by replenishing diminished NAD+ with PARP inhibition. Although NAD+ was not affected, overexpressing SIRT3 with PARP inhibition fully restored hexokinase activity, correcting the glycolytic pathway in AR100Q quadriceps, and rescued motor endurance of SBMA mice. These data demonstrate that targeting metabolic anomalies can restore motor function downstream of polyQ-expanded AR.

Details

Language :
English
ISSN :
25890042
Volume :
26
Issue :
8
Database :
Directory of Open Access Journals
Journal :
iScience
Publication Type :
Academic Journal
Accession number :
edsdoj.0ad1fa7b373a453e989aeb3538dcebdf
Document Type :
article
Full Text :
https://doi.org/10.1016/j.isci.2023.107375