TABLE 2.

Metabolic activity of KB cells incubated with HRgpA or TLCK-HRgpA for 48 h

Dilution of HRgpABApNA activity (U ml−1)MTT absorbance (% of control)a
HRgpAPTLCK-HRgpAP
1/81.0124.7<0.05125.3<0.05
1/160.5127.3<0.05125.5<0.05
1/320.25120.7<0.05110.1NS
1/640.125116.0NS109.9NS
1/1280.0625115.6NS108.0NS
1/2560.0312114.1NS102.8NS
1/5120.0156106.3NS103.4NS
1/1,0240.0078106.2NS105.6NS
  • a Mean MTT absorbance values (570 nm) from groups of eight wells are expressed as percentages of the DMEM control values. NS, not significant. The results shown are representative of two experiments.