Abstract
Apoptosis rather than differentiation is a physiological process during myogenesis and muscle regeneration. When cultured myoblasts were induced to differentiate, we detected an increase in caspase 8 activity. Pharmacological inhibition of caspase 8 activity decreased apoptosis. Expression of a dominant-negative mutant of the adapter protein FADD also abrogated apoptosis, implicating a death ligand pathway. Treatment with TRAIL, but not Fas, induced apoptosis in these myoblasts. Accordingly, treatment with a soluble TRAIL decoy receptor or expression of a dominant-negative mutant of the TRAIL receptor DR5 abrogated apoptosis. While TRAIL expression levels remained unaltered in apoptotic myoblasts, DR5 expression levels increased. Finally, we also detected a reduction in FLIP, a death-receptor effector protein and caspase 8 competitive inhibitor, to undetectable levels in apoptotic myoblasts. Thus, our data demonstrate an important role for the TRAIL/DR5/FADD/caspase 8 pathway in the apoptosis associated with skeletal myoblast differentiation. Identifying the functional apoptotic pathways in skeletal myoblasts may prove useful in minimizing the myoblast apoptosis that contributes pathologically to a variety of diseases and in minimizing the apoptosis of transplanted myoblasts to treat these and other disease states.
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Abbreviations
- FADD:
-
Fas-associated death domain
- TRAIL:
-
Tumor necrosis factor related apoptosis-inducing ligand
- FLIP:
-
FADD-like IL-1-converting enzyme-inhibitory protein
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Acknowledgment
We thank A. Almasan (Learner Research Institute, Cleveland Clinic), V. Dixit (Genetech, Inc.) and E.S.Alnemri (Thomas Jefferson University) for generously providing the dnFADD and dnDR5 constructs. This work was supported by an NIH RO1 CA84212 awarded to C.M. Weyman.
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O’Flaherty, J., Mei, Y., Freer, M. et al. Signaling through the TRAIL receptor DR5/FADD pathway plays a role in the apoptosis associated with skeletal myoblast differentiation. Apoptosis 11, 2103–2113 (2006). https://doi.org/10.1007/s10495-006-0196-4
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DOI: https://doi.org/10.1007/s10495-006-0196-4