Complementary hydrogen bonding interaction triggered co-assembly of an amphiphilic peptide and an anti-tumor drug.

We report a new tumor-targeting amphiphilic peptide that can form complementary hydrogen bonds with anti-tumor drug methotrexate (MTX), leading to reversible self-assembled morphology transition from loose micelles to densely packed nanorods or nanofibers. The MTX loaded nanorods can target tumor cells and show more than 2-fold higher cytotoxicity (IC50 = 0.38 mg L(-1)) than that towards normal cells (IC50 = 0.89 mg L(-1)).