Table 1.

Ratio of the cellular uptake efficiency of 1,5-dihexadecyl N,N-diglutamyl-lysyl-L-glutamate (GGLG) and maleimide-modified (M-)GGLG liposomes in serum-free medium at 4°C to that at 37°C in HeLa, HCC1954, MDA-MB-468, and COS-7 cells

Cell line	HeLa	HCC1954	MDA-MB-468	COS-7
GGLG liposomes	39.6%±2.0%	27.7%±10.5%	24.3%±4.9%	27.3%±5.8%
M-GGLG liposomes	66.5%±1.2%	53.7%±10.1%	35.4%±3.3%	63.4%±4.9%

Notes: Data are expressed as the mean ± standard deviation; n=4. 100% indicates the level of cellular uptake efficiency of liposomes in serum-free medium at 37°C.