Abstract
Apoptotic signaling plays an important role in the development and maintenance of healthy skeletal muscle. However, dysregulation of apoptotic signals in skeletal muscle is associated with atrophy and loss of function. Apoptosis repressor with caspase recruitment domain (ARC) is a potent anti-apoptotic protein that is highly expressed in skeletal muscle; however, its role in this tissue has yet to be elucidated. To investigate whether ARC deficiency has morphological, functional, and apoptotic consequences, skeletal muscle from 18 week-old wild-type and ARC knockout (KO) mice was studied. In red muscle (soleus), we found lower maximum tetanic force, as well as a shift towards a greater proportion of type II fibers in ARC KO mice. Furthermore, the soleus of ARC KO mice exhibited lower total, as well as fiber type-specific cross sectional area in type I and IIA fibers. Interestingly, these changes in ARC KO mice corresponded with increased DNA fragmentation, albeit independent of caspase or calpain activation. However, cytosolic fractions of red muscle from ARC KO mice had higher apoptosis inducing factor content, suggesting increased mitochondrial-mediated, caspase-independent apoptotic signaling. This was confirmed in isolated mitochondrial preparations, as mitochondria from skeletal muscle of ARC KO mice were more susceptible to calcium stress. Interestingly, white muscle from ARC KO mice showed no signs of altered apoptotic signaling or detrimental morphological differences. Results from this study suggest that even under basal conditions ARC influences muscle apoptotic signaling, phenotype, and function, particularly in slow and/or oxidative muscle.
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Abbreviations
- ½RT:
-
Half relaxation time
- AIF:
-
Apoptosis inducing factor
- ANT:
-
Adenine nucleotide translocator
- ARC:
-
Apoptosis repressor with caspase recruitment domain
- AU:
-
Arbitrary units
- Bax:
-
Bcl-2 associated X protein
- Bcl-2:
-
B cell lymphoma 2
- CLAMS:
-
Comprehensive Lab Animal Monitoring System
- CSA:
-
Cross sectional area
- CuZnSOD:
-
Copper zinc superoxide dismutase
- Cyto C:
-
Cytochrome C
- EndoG:
-
Endonuclease G
- ER:
-
Endoplasmic reticulum
- FLIP:
-
FLICE-like inhibitory protein
- GPD:
-
α-Glycerophosphate dehydrogenase
- HET:
-
Heterozygous
- HMW:
-
High molecular weight
- Hsp70:
-
Heat shock protein 70
- KO:
-
Knockout
- LC3B:
-
Microtubule-associated protein 1 light chain 3 beta
- MAFbx:
-
Muscle atrophy F-box
- MOMP:
-
Mitochondrial outer membrane permeabilization
- MuRF1:
-
Muscle RING-finger protein-1
- p62:
-
p62/sequestosome 1
- PFK:
-
Phosphofructokinase
- PTP:
-
Permeability transition pore
- R123:
-
Rhodamine 123
- RQ:
-
Red quadriceps
- SDH:
-
Succinate dehydrogenase
- Smac:
-
Second mitochondria-derived activator of caspase
- TPT:
-
Time to peak tension
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick end labeling
- UPS:
-
Ubiquitin proteasome system
- \({\dot{\hbox{V}}}{\hbox{O}}_2\) :
-
Oxygen consumption
- WQ:
-
White quadriceps
- WT:
-
Wild-type
- XIAP:
-
X-linked inhibitor of apoptosis
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Acknowledgments
This research was supported by funds provided to Joe Quadrilatero by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Institutes of Health Research (CIHR). The authors declare no competing financial interests.
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Mitchell, A.S., Smith, I.C., Gamu, D. et al. Functional, morphological, and apoptotic alterations in skeletal muscle of ARC deficient mice. Apoptosis 20, 310–326 (2015). https://doi.org/10.1007/s10495-014-1078-9
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DOI: https://doi.org/10.1007/s10495-014-1078-9