NDLI: Adaptive changes in structure of skeletal muscles from adult Sod1 homozygous knockout mice

Content Provider	Springer Nature Link
Author	Kostromiva, Tatiana Y. Pasyk, Krystyna A. Remmen, Holly Richardson, Arlan G. Faulkner, John A.
Copyright Year	2006
Abstract	Cu/Zn superoxide dismutase (SOD1), which is localized cytoplasmically and in the mitochondrial intermembrane space, is an enzyme that is critically important for superoxide free-radical elimination. Compared with age-matched wild-type littermates (Sod1 +/+ ), SOD1 homozygous knockout (Sod1 -/- ) mice have smaller body masses, heart and skeletal muscle masses, and muscle cross-sectional areas. At the light-microscopic level, cross sections of skeletal muscles from Sod1 -/- mice show no gross structural abnormalities. Following the staining of muscles of Sod1 -/- mice for succinate dehydrogenase (SDH) enzymatic activity, a grouping of SDH-positive fibers has been observed. Immunostaining for neural cell adhesion marker in the gastrocnemius muscle of Sod1 -/- mice has revealed a small number of atrophic denervated muscle fibers. No denervated fibers are observed in extensor digitorum longus (EDL), tibialis anterior, or plantaris muscles. An increase in mRNA expression levels of myogenin and acetylcholine receptor alpha has been detected in muscles in Sod1 -/- mice, but no changes in MyoD expression occur. Compared with fast oxidative fibers in EDL muscles of Sod1 +/+ mice, those of Sod1 -/- mice show increased accumulations of sub-sarcolemmal mitochondria. We conclude that the lack of SOD1 in adult Sod1 -/- mice does not result in extensive denervation of skeletal muscle fibers, although the distribution of fiber types is modified, and that fast oxidative fibers develop alterations in the amount and spatial distribution of sub-sarcolemmal mitochondria.
Starting Page	595
Ending Page	605
Page Count	11
File Format	PDF
ISSN	0302766X
Journal	Cell and Tissue Research
Volume Number	327
Issue Number	3
e-ISSN	14320878
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-11-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electron microscopy Superoxide dismutase Gene expression Sub-sarcolemmal mitochondria Denervation Mouse, knockout (Sod1 -/- ) Molecular Medicine Proteomics Human Genetics
Content Type	Text
Resource Type	Article
Subject	Cell Biology Histology Pathology and Forensic Medicine

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