Collagen expression and biomechanical response to human recombinant transforming growth factor beta (rhTGF-beta2) in the healing rabbit MCL

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
K P SpindlerL B Nanney

Abstract

We investigated biomechanical and collagen expression in a healing bilateral rabbit medial collateral ligament (MCL) model to human recombinant transforming growth factor beta (rhTGF-beta2) at three and six weeks. Each rabbit had rhTGF-beta2 in a bioabsorbable pellet administered in one side, with the contralateral side serving as control (no rhTGF-beta2). All MCL healed with rhTGF-beta2 producing a profoundly increased scar mass at three weeks which decreased in size toward control at six weeks. In-situ hybridization demonstrated collagen expression (type I and III) no different than control at three weeks, but by six weeks elevated expression of type I was seen. Biomechanical analysis at three weeks showed no effect of rhTGF-beta2 on structural properties. However, at six weeks rhTGF-beta2 significantly inhibited both the maximum load (p < 0.05) and energy absorbed (p < 0.05) with no change in stiffness. Despite increased type I collagen expression and profound increase in early scar mass, rhTGF-beta2 did not improve the structural properties. Whether the dose or mode of delivery is responsible for decline in structural properties cannot be determined in this design. We hypothesize investigations of healing ligaments to cytok...Continue Reading

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