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Complement deposition and cell death after myoblast transplantation
1Unité de Recherche en Génétique Humaine, Centre Hospitalier de l'Université Laval, Ste-Foy, Québec, Canada.
Cell Transplantation
|October 24, 1998
Summary
Early death of transplanted myoblasts is a challenge. This study found complement activation is secondary to cell death, not a direct cause, but may attract immune cells.
Area of Science:
- Biomedical research
- Cell biology
- Immunology
Background:
- Myoblast transplantation (MT) is limited by early graft failure.
- The role of complement in transplanted myoblast survival is unclear.
Purpose of the Study:
- To investigate the role of complement activation in the early death of transplanted myoblasts.
- To determine if complement directly damages transplanted cells or contributes to immune cell infiltration.
Main Methods:
- Myoblast transplantation performed in CD1 mice and Macaca mulata monkeys.
- Complement C3 depletion using Cobra Venom Factor in mice.
- Assessment of myoblast necrosis via intracellular calcium.
- Immunohistochemical analysis for complement deposition (C3, C5b-9).
Main Results:
- In mice, C3 deposition was observed in damaged muscle and necrosed myoblasts; complement depletion did not reduce cell death.
- In monkeys, minimal C3 or C5b-9 deposition was found on transplanted myoblasts, mostly intracellular.
- Complement activation appeared secondary to myoblast necrosis.
Conclusions:
- Complement activation is not the primary cause of early transplanted myoblast death.
- Complement's role may be in attracting neutrophils and macrophages to the graft site due to its chemotactic properties.