Differential regulation of MSX2. (A) Nine cell lines in addition to CD34+ primary HSCs were analyzed by expression profiling. The heat map shows expression levels of genes involved in regulation of MSX2 in T-cell lines. Red indicates high, green low and black intermediate expression levels. Of note, HPB-ALL expresses high levels of IL7R; PER-117 expresses high levels of TGFBR3 and low levels of LEF1, CD3D, CD3E and CD3G. (B) HPB-ALL and MOLT-4 cells were treated for 16 h with low amounts of IL7. Subsequent analysis of MSX2 expression by real-time PCR indicates increasing levels in HPB-ALL (expresses high IL7R levels) but no change in MOLT-4 (expresses low IL7R levels). Bars show standard deviations. (C) T-cell lines JURKAT, MOLT-4 and PEER were treated with 500 nM 5-Aza-2'-deoxycytidine for 24 h. Subsequent real-time PCR analysis indicates about 8-, 3-, and 4-fold increased levels of MSX2 expression, respectively.