A–E) PVTL-1 or HEL cells were treated with 1.5 µM JakI-1 or dasatinib at 20 nM (A, C, E) or 15 nM (B, D), as indicated, for 6 h (A, C, E) or 1 h (B, D) and lysed. Total cell lysates were subjected to Western blot analyses using indicated antibodies. Abbreviations used are: Jak2-PY, phospho-Y1007/1008-Jak2; STAT5-PY, phospho-Y694-STAT5; Lyn-PY, phospho-Y396-Lyn; 4EBP1-nonP, non-phospho-T46-4EBP1; 4EBP1-P, phospho-T37/46-4EBP1; Erk-P, phospho-T202/Y204-Erk; mTOR-P, phospho-S2448-mTOR; S6K-P, phospho-T389-p70S6K; S6RP-P, phospho-S240/244-S6RP; eIF4B-P, phospho-S422-eIF4B, GSK3-P, phospho-S21/9-GSK3α/ß. F) PVTL-1 cells were precultured with or without 5 µM SB216763 for 1 h and further cultured with or without 1.5 µM JakI-1 or 20 nM dasatinib, as indicated, for 24 h. Cells were analyzed for cellular DNA content with PI by flow cytometry. Percentages of apoptotic cells with sub-G1 DNA content are indicated. G) PVTL-1 cells were precultured with or without 10 µM SB216763 for 1 h and further cultured with or without 1.5 µM JakI-1 or 20 nM dasatinib, as indicated, for 24 h. Cells were lysed and subjected to Western blot analyses using indicated antibodies. Cl. Casp-3: Cleaved Caspase-3.