1. Volume 19, Issue 10, Pages 830-841 (October 2017)
Chk1 Inhibitor SCH Effectively Potentiates the Cytotoxic Effects of Platinum- Based Chemotherapeutic Drugs in Human Colon Cancer Cells 
Jarmila Herůdková, Kamil Paruch, Prashant Khirsariya, Karel Souček, Martin Krkoška, Olga Vondálová Blanářová, Petr Sova, Alois Kozubík, Alena Hyršlová Vaculová 
Neoplasia 
Volume 19, Issue 10, Pages (October 2017)
DOI: /j.neo
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2. Figure 1
SCH or Chk1 siRNA mediated sensitization of HCT116 cells to LA-12/cisplatin-induced apoptosis. (A) Percentage of annexin V+/PI− (flow cytometry) HCT116 wt cells and (B) cleavage (cl.) of PARP, caspase-9, level of phosphorylated (Ser139) H2AX (γ-H2AX), phosphorylated (Ser296), and total Chk1 (Western blotting) following pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM) in the absence (DMSO) or presence of z-VAD-fmk (10 μM). (C) Cleavage of PARP, caspase-9, caspase-3, level of γ-H2AX and Chk1 (Western blotting), and (D) cleavage of caspase-3 (flow cytometry) in HCT116 wt cells transfected (24 hours) with control or Chk1 siRNA, pretreated (2 hours) with SCH (SCH, 3 μM) and subsequently treated (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for with versus without z-VAD-fmk or control versus Chk1 siRNA.
Neoplasia  , DOI: ( /j.neo )
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3. Figure 2
The role of p53 and p21 in SCH mediated sensitization of HCT116 cells to LA-12/cisplatin-induced cytotoxicity. (A, B) Total and phosphorylated (Ser15) p53, total p21, cleaved PARP, γ-H2AX, phosphorylated (Ser296), and total Chk1 level (Western blotting) in wt versus p53−/− or wt versus p21−/− HCT116 cells pretreated (2 hours) with SCH (SCH, 3 μM) and subsequently treated (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (C) Percentage of annexin V+/PI− or (D) annexin V+/PI+ (flow cytometry) wt, p53−/−, and p21−/− HCT116 cells treated as in A and B. Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for wt versus p21−/− or wt versus p53−/− cells.
Neoplasia  , DOI: ( /j.neo )
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4. Figure 3
The relationship between cycle progression and apoptosis induced by combination of SCH and LA-12/cisplatin in HCT116 cells. (A) Percentage of wt and p21−/− HCT116 cells with caspase-3 cleavage related to the cell cycle progression (propidium iodide, flow cytometry) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representative of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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5. Figure 4
The cell cycle phase distribution in wt and p21−/− HCT116 cells treated with SCH and LA-12/cisplatin. Percentage of wt (A and B) and p21−/− (C and D) HCT116 cells in individual cell cycle phases (flow cytometry) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent 48-hour (A and C) or 72-hour (B and D) treatment with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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6. Figure 5
The levels of selected cell cycle regulatory proteins in wt, p21−/−, and p53−/− HCT116 cells treated with SCH and LA-12/cisplatin. The total level of cyclin D1, p27, phosphorylated (Ser 807/811) Rb, cyclin A, cdc25C, cyclin B1, survivin, phosphorylated (Ser10) and total histone 3 (H3), phosphorylated Aurora A/B/C (Thr288/232/198), and Aurora B (Western blotting) in wt, p21−/−, and p53−/− HCT116 cells following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are representatives of three independent experiments.
Neoplasia  , DOI: ( /j.neo )
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7. Figure 6
Senescence-associated changes in HCT116 wt cells treated with SCH and LA-12/cisplatin. (A) Percentage of HCT116 wt cells with β-galactosidase activity after pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (72 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM) followed by 72-hour cultivation in drug-free medium. (B) The level of p53, p21, cyclin D1, phosphorylated (Ser807/811) Rb, cyclin B1, and survivin (Western blotting) in HCT116 wt cells treated as in A. Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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8. Figure 7
Role of PTEN in SCH mediated sensitization of HCT116 cells to LA-12/cisplatin-induced apoptosis. (A) The level of PTEN, cleaved PARP, phosphorylated (Ser15) and total p53, p21, γ-H2AX, and phosphorylated (Ser296) and total Chk1 (Western blotting) in PTEN+/+ and PTEN−/− HCT116 cells following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (B) Percentage of annexin V+/PI− PTEN+/+ and PTEN−/− HCT116 cells treated as in A. Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for PTEN+/+ versus PTEN −/− cells.
Neoplasia  , DOI: ( /j.neo )
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9. Supplementary Figure 1
(A) Percentage of HCT116 wt cells with phosphorylated (Ser139) histone H2AX (γ-H2AX) (flow cytometry) following pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (B) Percentage of annexin V+/PI− or annexin V+/PI+ (flow cytometry) HCT116 wt cells and (C) cleavage of PARP, caspase-9, level of γ-H2AX, and phosphorylated (Ser296) and total Chk1 (Western blotting) in HCT116 wt cells pretreated with SCH (SCH, 3 μM) and subsequently treated (72 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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10. Supplementary Figure 2
(A) Cleavage of PARP, caspase-9, caspase-3, and Chk1 level (Western blotting), and (B) cleavage of caspase-3 (flow cytometry) in HCT116 wt cells transfected (24 hours) with control or Chk1 siRNA pretreated (2 hours) with SCH (SCH, 3 μM) and subsequently treated (72 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for control versus Chk1 siRNA.
Neoplasia  , DOI: ( /j.neo )
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11. Supplementary Figure 3
(A) Percentage of dead (annexin V+/PI− plus annexin V+/PI+) wt and Chk2−/− HCT116 cells following pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (B) Cleavage of PARP, caspase-9, level of γ-H2AX, and phosphorylated (Ser296) and total Chk1 and Chk2 (Western blotting) in wt and Chk2−/− HCT116 cells treated as in A. (C) Percentage of Chk2−/− HCT116 cells with cleaved caspase-3 (flow cytometry) following their transfection (24 hours) with control or Chk1 siRNA, pretreatment (2 hours) with SCH (SCH, 3 μM), and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (D) Cleavage of PARP, caspase-9, caspase-3, level of γ-H2AX, Chk1, and Chk2 (Western blotting) in Chk2−/− HCT116 cells transfected and treated as in C. In D, HCT116 wt cells were used as a positive control for total Chk2 protein detection. Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for wt versus Chk2−/− or control versus Chk1 siRNA.
Neoplasia  , DOI: ( /j.neo )
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12. Supplementary Figure 4
(A) Percentage of annexin V+/PI− (flow cytometry) HT-29 cells and (B) cleavage of PARP, caspase-9, level of γ-H2AX, and phosphorylated (Ser296) and total Chk1 (Western blotting) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (C) Percentage of annexin V+/PI− (flow cytometry) RKO cells and (D) cleavage of PARP, caspase-9, level of γ-H2AX, and phosphorylated (Ser296) and total Chk1 (Western blotting) following the same treatments as specified in (A and B). Results are means ± SEM or representative of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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13. Supplementary Figure 5
Caspase-3 cleavage (flow cytometry) in (A) wt versus p53−/− or (B) wt versus p21−/− HCT116 cells pretreated (2 hours) with SCH (SCH, 3 μM) and subsequently treated (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for wt versus p21−/− or wt versus p53−/− cells.
Neoplasia  , DOI: ( /j.neo )
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14. Supplementary Figure 6
(A) Percentage of annexin V+/PI− and (B) annexin V+/PI+ HCT116 p21−/− cells (flow cytometry), and (C) cleavage of PARP, caspase-9, caspase-3, level of γ-H2AX, and phosphorylated (Ser296) and total Chk1 (Western blotting) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM) in the absence (DMSO) or presence of z-VAD-fmk (10 μM). Results are means ± SEM or representative of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for with versus without z-VAD-fmk.
Neoplasia  , DOI: ( /j.neo )
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15. Supplementary Figure 7
Percentage of HCT116 p53−/− cells with caspase-3 cleavage related to the cell cycle progression (propidium iodide, flow cytometry) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representative of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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16. Supplementary Figure 8
(A, B) Percentage of polyploid (>4 N) wt or p21−/− HCT116 cells with (c3+) or without (c3−) active caspase-3 following pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent 48-hour (A) or 72-hour (B) treatment with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). (C, D) Percentage of polyploid (>4 N) wt or p53−/− HCT116 cells with (c3+) or without (c3−) active caspase-3, treated as in A and B. Results are means ± SEM or representative of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP, and Δ for wt versus p21−/− or wt versus p53−/− cells.
Neoplasia  , DOI: ( /j.neo )
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17. Supplementary Figure 9
(A, B) Percentage of HCT116 p53−/− cells in individual cell cycle phases (flow cytometry) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent 48-hour (A) or 72-hour (B) treatment with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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18. Supplementary Figure 10
Simultaneous analysis of 5-ethynyl-2′-deoxyuridine (EdU) incorporation and cell cycle (DAPI, flow cytometry) in HCT116 wt cells following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with (A) LA-12 (0.75 μM) or (B) cisplatin (CDDP, 20 μM). Results show percentages of the cells with incorporated EdU and are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12.
Neoplasia  , DOI: ( /j.neo )
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19. Supplementary Figure 11
The level of γ-H2AX, phosphorylated (Ser296) and total Chk1, cyclin B1, survivin, and phosphorylated (Ser10) histone 3 (p-H3) in HCT116 wt cells (Western blotting) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (8 or 24 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are representatives of three independent experiments.
Neoplasia  , DOI: ( /j.neo )
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20. Supplementary Figure 12
Percentage of HCT116 wt, p53−/−, and 21−/− cells with phosphorylation (Ser10) of histone 3 (p-H3) (flow cytometry) following their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for wt versus p53−/− or wt versus p21−/−
Neoplasia  , DOI: ( /j.neo )
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21. Supplementary Figure 13
(A) Representative microscopy pictures of the wt, p53−/−, and p21−/− HCT116 cells stained for β-galactosidase activity and quantified in Figure 6A after their pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (72 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM) followed by 72-hour cultivation in drug-free medium. (B) Percentage of p53−/− and p21−/− HCT116 cells with β-galactosidase activity treated as in A. Cell images were made by bright field microscopy with 10× magnification. Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH and Ο versus LA-12 or CDDP.
Neoplasia  , DOI: ( /j.neo )
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22. Supplementary Figure 14
Percentage of annexin V+/PI+ HCT116 PTEN+/+ and PTEN−/− cells following pretreatment (2 hours) with SCH (SCH, 3 μM) and subsequent treatment (48 hours) with LA-12 (0.75 μM) or cisplatin (CDDP, 20 μM). Results are means ± SEM or representatives of three independent experiments. Statistical significance: P<.05, * versus control, ‡ versus SCH, Ο versus LA-12 or CDDP and Δ for PTEN+/+ versus PTEN −/− cells.
Neoplasia  , DOI: ( /j.neo )
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