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Described a key mechanism in muscle regeneration
Date:12/19/2012

Researchers at the Bellvitge Biomedical Research Institute (IDIBELL) have described a new selective target in muscle regeneration. This is the association of alpha-enolase protein and plasmin. The finding could be used to develop new treatments to regenerate muscular injuries or dystrophies. The study has been published in PLOS ONE journal.

Skeletal muscle has a great regeneration capacity after injury or genetic diseases such as Duchenne muscular dystrophy, the most common neuromuscular disorder in children. This condition is due to a defect in the gene of dystrophin, which absence causes instability of the membrane and leads to degeneration of muscle fibres.

Regeneration involves the restructuration of the muscular tissue and it requires the participation of extracellular enzymes such as plasmin. The alpha-enolase, an enzyme found in the cytoplasm of cells, enables the activity of plasmin on the cell membrane giving the cell the ability to degrade the surrounding tissue.

In this study, IDIBELL researchers show that the association of alpha-enolase and plasmin regulates two connected processes in the injured muscle or dystrophy: first, the attraction (recruitment) of immune cells to remove damaged tissue and, on the other hand, the formation of new muscle tissue from the stem cells. The researchers observed in the laboratory that these stem cells lost the ability to activate and merge to form skeletal muscle fibers when specific inhibitors of the alfa-enolasa/plasmina union were applied.

The researchers also performed experiments in mice with Duchenne muscular injury. When the animals were treated with the same inhibitors, mice showed a significant defect in muscle regeneration.

"These results demonstrate that the interaction of alpha-enolase and plasmin is necessary for the restoration of damaged muscle tissue", explained Roser Lpez-Alemany, IDIBELL researcher and study coordinator.

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Contact: Ral Toran
comunicacio@idibell.cat
IDIBELL-Bellvitge Biomedical Research Institute
Source:Eurekalert

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