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  • Tgfβ signaling is required for tenocyte recruitment and functional neonatal tendon regeneration.

Tgfβ signaling is required for tenocyte recruitment and functional neonatal tendon regeneration.

eLife (2020-06-06)
Deepak A Kaji, Kristen L Howell, Zerina Balic, Dirk Hubmacher, Alice H Huang
ABSTRACT

Tendon injuries are common with poor healing potential. The paucity of therapies for tendon injuries is due to our limited understanding of the cells and molecular pathways that drive tendon regeneration. Using a mouse model of neonatal tendon regeneration, we identified TGFβ signaling as a major molecular pathway that drives neonatal tendon regeneration. Through targeted gene deletion, small molecule inhibition, and lineage tracing, we elucidated TGFβ-dependent and TGFβ-independent mechanisms underlying tendon regeneration. Importantly, functional recovery depended on canonical TGFβ signaling and loss of function is due to impaired tenogenic cell recruitment from both Scleraxis-lineage and non-Scleraxis-lineage sources. We show that TGFβ signaling is directly required in neonatal tenocytes for recruitment and that TGFβ ligand is positively regulated in tendons. Collectively, these results show a functional role for canonical TGFβ signaling in tendon regeneration and offer new insights toward the divergent cellular activities that distinguish regenerative vs fibrotic healing.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-Glyceraldehyde-3-Phosphate Dehydrogenase Antibody, clone 6C5, clone 6C5, Chemicon®, from mouse
Sigma-Aldrich
Anti-Actin, α-Smooth Muscle antibody, Mouse monoclonal, clone 1A4, purified from hybridoma cell culture