Recombinant nAG (a Salamander-Derived Protein) Decreases the Formation of Hypertrophic Scarring in the Rabbit Ear Model

Abstract

nAG (newt-Anterrior Gradient) protein is the key mediator of regrowth of amputated limbs in salamanders. In a previous work in our lab, a newnAGgene (suitable for humans) was designed and cloned. The cloned vector was transfected into primary human fibroblasts. The expression ofnAGin human primary fibroblasts was found to suppress collagen expression. The current study shows that local injection of recombinant nAG reduces scar hypertrophy in the rabbit ear model. This is associated with lower scar elevation index (SEI), lower levels of collagen I & III, higher levels of MMP1, and a higher degree of scar maturation in experimental wounds compared to controls.