Blasts from two patients, termed P1-ALL and P2-ALL, were isolated and cultured,
as described in Materials and Methods. A. Extracts were made from
KB3 or RS4;11 cell lines or from P1-ALL and P2-ALL cultures as indicated and
subjected to immunoblotting for Bcl-2, Bcl-xL or Mcl-1. GAPDH was used as a
loading control. B, C. Cell viability was assessed by MTT assay as
described in Materials and Methods. P1-ALL or P2-ALL cells as indicated were
treated with vehicle (100% viability) or increasing concentrations of ABT-263
for 72 h. Results are given as mean ± s.d. (n = 6).