TYK2 is required for the survival of T-ALL cells.

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Cell Physiol Biochem 2013;32: DOI: /
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TYK2 is required for the survival of T-ALL cells. TYK2 is required for the survival of T-ALL cells. A, primary cells from a pediatric patient with T-ALL were electroporated with siRNAs targeting each member of the tyrosine kinome as well as N-RAS, K-RAS, and control scrambled siRNA. Cell viability values are shown in relation to the group mean ± 2 SDs. Values above or below the 2-SD threshold were considered significant. B, shRNA screen with approximately 5,000 inducible shRNAs that collectively target 1,740 genes were conducted on 3 T-ALL cell lines (JURKAT, CCRF-CEM, and SKW-3/KE-37) and 4 diffuse large B-cell lymphoma (DLBCL) cell lines (Ly3, Ly10, Ly7, and Ly19). Depletion of TYK2 shRNA from the cell population was calculated as shRNA-uninduced/induced (log2), and is shown as the mean ± SEM of 4 independent experiments. C, validated shRNAs targeting JAK1, JAK2, JAK3, or TYK2 as well as 2 control shRNAs (GFP and Luc) were transduced by lentivirus infection into JURKAT cells. The number of shRNAs tested is indicated in parentheses. Cell viability was measured after 3 and 7 days of infection. Growth rate (day 7/day 3) relative to the mean of control samples is reported as the mean ± SEM (n = 2–6). *, P < 0.05 by 2-sample, 2-tailed t test. D, the 3 TYK2-targeting shRNAs as well as control GFP shRNA were transduced by lentivirus infection into JURKAT cells. Relative cell growth values (means ± SEM of triplicate experiments) at days 3, 5, 7, and 9 after infection are shown. E, the 3 TYK2-targeting shRNAs as well as control GFP shRNA were transduced in 5 T-ALL cell lines (JURKAT, RPMI-8402, HPB-ALL, MOLT-4, and LOUCY). Growth rate (day 7/day 3) relative to control is shown as the mean ± SEM of triplicate experiments. *, P < 0.05; **, P < 0.01; ***, P < 0.001 by 2-sample, 2-tailed t-test. F, primary T-ALL cells were initially expanded by primagraft into Rag2−/−γc−/− or NOD/Scid/Il2rg−/− mice, subsequently expanded on OP9-DL1 or MS5-DL1 cells, and electroporated with nonspecific siRNA (control) or siRNA targeting TYK2 followed by a 4-day culture. Values represent mean percent cell viability (normalized to viability of control siRNA) ± SEM of quadruplicate experiments. *, P < 0.05 by 2-sample, 2-tailed t test. G, JURKAT, RPMI-8402, HPB-ALL, or LOUCY cells harboring GFP or TYK2 shRNAs were analyzed for rate of apoptosis after 4 days of lentiviral infection by flow cytometric analysis of cells stained with Annexin V-FITC. The values are means ± SEM of triplicate experiments. *, P < 0.05; **, P < 0.01 by 2-sample, 2-tailed t test. H, cDNA containing the wild-type (WT) TYK2 was transduced by retroviral infection in JURKAT cells. The cells were then transduced by lentivirus infection with control GFP or TYK2 #2 shRNA, which targets the 3′ untranslated region of TYK2 mRNA. Whole-cell extracts were harvested and subjected to immunoblot analysis with antibodies specific for total TYK2, PARP, and α-tubulin (internal control). Growth rate (day 7/day 3) relative to control is shown as the mean ± SEM of triplicate experiments. ***, P < 0.001 by 2-sample, 2-tailed t test. Takaomi Sanda et al. Cancer Discovery 2013;3:564-577 ©2013 by American Association for Cancer Research