Modification of Human Umbilical Cord Blood Stem Cells Using Polyethylenimine Combined with Modified TAT Peptide to Enhance BMP-2 Production

Figure 2

Characterization of PEI (polymer/gWizDNA weight ratio at 8/1), PEI25 (polymer/gWizDNA weight ratio at 8/1), and mTAT/PEI (mTAT/polymer/gWizDNA weight ratio at 8/8/1) complexes of gWiz-BMP2. (a) Zeta potential of the three complexes’ formulations (Figure 2(a)). (b) Nanoparticle size of the two complexes’ formulations (Figure 2(b)). (c) Electron microscopic image of mTAT/PEI/DNA complexes (mTAT/polymer/gWizDNA weight ratio at 8/8/1). Scale bar, 100 nm. versus PEI or PEI25.

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