The present invention provides a composition for delivering a polynucleotide into cells via a polyplex. The polyplex comprises the polynucleotide and a polymer. The composition comprises the polyplex, a collagen-mimetic peptide (CMP) and collagen fragments. The CMP is bound to the polyplex and the collagen fragments. Also provided are the uses of the composition in methods of delivering a polynucleotide into cells as well as methods of improving wound healing in a subject, enhancing cell proliferation in a subject, enhancing production of extracellular matrix by cells in a subject and/or enhancing cell migration by cells in a subject.
