Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy

Alina Maloyan, Hanna Osinska, Jan Lammerding, Richard T. Lee, Oscar H. Cingolani, David A. Kass, John N. Lorenz, Jeffrey Robbins

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

An R120G mutation in αB-crystallin (CryAB R120G) causes desmin-related myopathy (DRM). In mice with cardiomyocyte-specific expression of the mutation, CryAB R120G-mediated DRM is characterized by CryAB and desmin accumulations within cardiac muscle, mitochondrial deficiencies, activation of apoptosis, and heart failure (HF). Excessive production of reactive oxygen species (ROS) is often a hallmark of HF and treatment with antioxidants can sometimes prevent the progression of HF in terms of contractile dysfunction and cardiomyocyte survival. It is unknown whether blockade of ROS is beneficial for protein misfolding diseases such as DRM. We addressed this question by blocking the activity of xanthine oxidase (XO), a superoxide-generating enzyme that is upregulated in our model of DRM. The XO inhibitor oxypurinol was administered to CryAB R120G mice for a period of 1 or 3 months. Mitochondrial function was dramatically improved in treated animals in terms of complex I activity and conservation of mitochondrial membrane potential. Oxypurinol also largely restored normal mitochondrial morphology. Surprisingly, however, cardiac contractile function and cardiac compliance were unimproved, indicating that the contractile deficit might be independent of mitochondrial dysfunction and the initiation of apoptosis. Using magnetic bead microrheology at the single cardiomyocyte level, we demonstrated that sarcomeric disarray and accumulation of the physical aggregates resulted in significant changes in the cytoskeletal mechanical properties in the CryAB R120G cardiomyocytes. Our findings indicate that oxypurinol treatment largely prevented mitochondrial deficiency in DRM but that contractility was not improved because of mechanical deficits in passive cytoskeletal stiffness.

Original languageEnglish (US)
Pages (from-to)1021-1028
Number of pages8
JournalCirculation Research
Volume104
Issue number8
DOIs
StatePublished - Apr 24 2009
Externally publishedYes

Fingerprint

Oxypurinol
Cardiac Myocytes
Heart Failure
Xanthine Oxidase
Reactive Oxygen Species
Proteostasis Deficiencies
Apoptosis
Mutation
Crystallins
Desmin
Mitochondrial Membrane Potential
Superoxides
Compliance
Myocardium
Antioxidants
Myopathy, Myofibrillar, Desmin-Related
Enzymes

Keywords

  • Antioxidants
  • Mitochondria
  • Oxidative stress
  • Protein misfolding
  • Reactive oxygen species

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Maloyan, A., Osinska, H., Lammerding, J., Lee, R. T., Cingolani, O. H., Kass, D. A., ... Robbins, J. (2009). Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy. Circulation Research, 104(8), 1021-1028. https://doi.org/10.1161/CIRCRESAHA.108.193516

Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy. / Maloyan, Alina; Osinska, Hanna; Lammerding, Jan; Lee, Richard T.; Cingolani, Oscar H.; Kass, David A.; Lorenz, John N.; Robbins, Jeffrey.

In: Circulation Research, Vol. 104, No. 8, 24.04.2009, p. 1021-1028.

Research output: Contribution to journalArticle

Maloyan, A, Osinska, H, Lammerding, J, Lee, RT, Cingolani, OH, Kass, DA, Lorenz, JN & Robbins, J 2009, 'Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy', Circulation Research, vol. 104, no. 8, pp. 1021-1028. https://doi.org/10.1161/CIRCRESAHA.108.193516
Maloyan A, Osinska H, Lammerding J, Lee RT, Cingolani OH, Kass DA et al. Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy. Circulation Research. 2009 Apr 24;104(8):1021-1028. https://doi.org/10.1161/CIRCRESAHA.108.193516
Maloyan, Alina ; Osinska, Hanna ; Lammerding, Jan ; Lee, Richard T. ; Cingolani, Oscar H. ; Kass, David A. ; Lorenz, John N. ; Robbins, Jeffrey. / Biochemical and mechanical dysfunction in a mouse model of desmin-related myopathy. In: Circulation Research. 2009 ; Vol. 104, No. 8. pp. 1021-1028.
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