title: New ligament healing model based on tissue-engineered collagen scaffolds.
abstract: The anterior cruciate ligament (ACL) is often the target of knee trauma. This ligament does not heal very well, leading to joint instability. Long-term instability of the knee can lead to early arthritis and loss of function. To develop efficient strategies to stimulate posttraumatic ACL regeneration in vivo, a good healing model is needed in vitro. Such a model must remain as simple as possible, but should include key features to provide relevant answers to precise questions about the clinical problem addressed. Here, we report tissue-engineered type I collagen scaffolds developed to establish an ACL healing model in vitro and a potential ACL substitute in vivo. Such scaffolds were used to evaluate ACL cell growth, migration, and the capacity to synthesize and assemble collagen fibers for up to 40 days in vitro and up to 180 days in vivo. They were anchored with two bone plugs to allow their static stretching in culture and to facilitate their surgical implantation in knee joints. Our results have shown that living ACL fibroblasts can attach, migrate, and colonize this type of scaffold. In vitro, the cells populated the scaffolds and expressed mRNAs coding for the prolyl-4-hydroxylase, involved in collagen fibers' assembly. In vivo, acellular implants were vascularized and populated with caprine cells that migrated from the osseous insertions toward the center of the grafts. This model is a very good tool to study ACL repair and identify the factors that could accelerate its healing postsurgery.
authors.affiliation: Laboratory of Tissue Engineering/LOEX, Centre de recherche du Centre Hospitalier Affilié (CHA), Hôpital de l'Enfant-Jésus, Québec, Canada.
authors.forename: Lina M
authors.initials: LM
authors.lastname: Robayo
authors.forename: Véronique J
authors.initials: VJ
authors.lastname: Moulin
authors.forename: Pierrot
authors.initials: P
authors.lastname: Tremblay
authors.forename: Réjean
authors.initials: R
authors.lastname: Cloutier
authors.forename: Jean
authors.initials: J
authors.lastname: Lamontagne
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Larkin
authors.forename: Stéphane
authors.initials: S
authors.lastname: Chabaud
authors.forename: Franck
authors.initials: F
authors.lastname: Simon
authors.forename: Nazrul
authors.initials: N
authors.lastname: Islam
authors.forename: Francine
authors.initials: F
authors.lastname: Goulet
mesh_terms: D000818:Animals; D016118:Anterior Cruciate Ligament / Q000502:physiology*; D024042:Collagen Type I / Q000502:physiology*; D005347:Fibroblasts / Q000502:physiology*; D006041:Goats; D006801:Humans; D007718:Knee Injuries / Q000628:therapy; D008954:Models, Biological; D046509:Tissue Culture Techniques; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds; D014945:Wound Healing / Q000502:physiology*
chemical_list: D024042:Collagen Type I