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Updated: Mar 21, 2026
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Immunolabelling Myofiber Degeneration in Muscle Biopsies
Published on: December 5, 2019
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Cell death regulates muscle fiber number
Tatevik Sarkissian1, Richa Arya1, Seda Gyonjyan1
1CBRC, Massachusetts General Hospital Research Institute/Harvard Medical School, Boston, MA 02129, USA.
Developmental Biology
|May 2, 2016
Summary
Cell death in the nervous system and muscles is crucial for normal development. This study reveals that neuronal cell death non-autonomously regulates muscle fiber number via FGF signaling in Drosophila.
Area of Science:
- Developmental Biology
- Neuroscience
- Cell Biology
Background:
- Cell death plays vital roles in development, including eliminating stem cells and neurons.
- Central cell death regulators grim and reaper are essential for CNS development.
Purpose of the Study:
- To investigate the role of neuronal cell death in muscle development.
- To elucidate the mechanisms by which neuronal cell death influences muscle fiber number.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Genetically manipulated cell death regulators (grim and reaper).
- Assessed muscle fiber number and FGF signaling pathways.
Main Results:
- Absence of grim and reaper led to increased muscle fiber number in adult Drosophila.
- Inhibiting CNS cell death partially mimicked this phenotype, indicating a non-autonomous role.
- FGFs from the CNS were essential for the increased muscle fiber number.
- Cell death within the muscle lineage also impacts fiber specification.
Conclusions:
- Neuronal cell death non-autonomously limits muscle fiber number.
- FGF signaling from the CNS acts as a survival signal for muscle founder cells.
- Proper muscle fiber specification requires coordinated cell death in both the nervous system and muscle.
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