Fig. 5.
Sphingomyelin levels in response to AA and melittin. [3H]Choline-labeled HL-60 cells were treated with either 10 μmol/L AA (A) or 500 ng/mL of melittin (B) and sphingomyelin levels were determined as described in Materials and Methods. The data (means ± SD) are expressed as a percentage of the control level obtained from three independent experiments assayed in duplicate. * Significantly different (P < .05, Student's t-test) from controls.