Cytotoxic and selective effect of RWQWRWQWR peptide and peptides functionalized with the RGD motif

CodePeptideIC50, µg/mL (µM)Selectivity indexHemolysis (%)a
MCF-7Fibroblasts
1R5R9RRWQWRWQWR120 (81)> 200 (135)*> 1.66.7
14RGD-Ahx-RWQWRWQWR27 (14)108 (56)4.07.1
R1R5R9RRRWQWRWQWR112 (68)> 200 (121)*> 1.86.4
19RGD-Ahx-RRWQWRWQWR82 (39)195 (94)2.42.0

a Percentage of hemolysis calculated at the maximum concentration (200 µg/mL). *: IC50 could not be calculated because at the maximum concentration, there was no reduction in viability by 50%; IC50: half maximal inhibitory concentration