Figure 3Effects of the PTP desensitizers CsA or C63 (5 µM each, 1 h preincubation) on mitochondrial Ca2+ levels recorded with GCAMP6f (A) in cells treated with cl-HK2pep. Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each) Effects of the PTP desensitizers CsA or C63 (5 µM each, 1 h preincubation) on mitochondrial membrane potential assessed with TMRM (B) in cells treated with cl-HK2pep. Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each) cell death induction by cl-HK2pep; in the cytofluorimetric analyses viable cells are double negative for Annexin V-FITC and 7-AAD staining and measured 15 min after peptide treatment data are presented as mean±SD and they were obtained from 3 different experiments or more; 3 technical replicates in all analyzed experiment. Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each) data are presented as mean±SD of at least 3 independent experiments. *** p<0.001 with a Student's t test cell death induction by cl-HK2pep; in the cytofluorimetric analyses in the kinetic experiment shown in (D; scale bar: 50µm) viable cells are double negative for Annexin V-FITC and 7-AAD and TMRM positive. Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each) cell death induction by cl-HK2pep; in the cytofluorimetric analyses viable cells are double negative for Annexin V-FITC and 7-AAD staining and measured 15 min after peptide treatment Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each); where indicated, the caspase inhibitor Z-VAD-fmk or the calpain inhibitor PD150606 (50 µM each) are pre-incubated 1 h before peptide treatment. cell death induction by cl-HK2pep; in the cytofluorimetric analyses viable cells are double negative for Annexin V-FITC and 7-AAD staining and measured 15 min after peptide treatment data are presented as mean±SD and they were obtained from 3 different experiments or more; 3 technical replicates in all analyzed experiment. Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each) where indicated calpain inhibitor PD150606 (50 µM each) are pre-incubated 1 h before peptide treatment. data are presented as mean±SD of at least 3 independent experiments. p<0.0001 with a two-way ANOVA (cl-HK2pep treatment vs cl-HK2pep+PD150606 or cl-SCRpep treatments); Bonferroni post-test in graph ***p<0.001 (cl-HK2pep vs cl-SCRpep and cl-HK2pep vs PD150606+cl-HK2pep). Effect of calpain inhibition on mitochondrial membrane potential assessed with TMRM (G, normalized fluorescence signal mean±SD; 3 different experiments including 3 technical replicates each) in cells treated with cl-HK2pep Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each); where indicated calpain inhibitor PD150606 (50 µM each) are pre-incubated 1 h before peptide treatment. data are presented as mean±SD of at least 3 independent experiments. p<0.0001 with a two-way ANOVA (cl-HK2pep treatment vs cl-HK2pep+PD150606 or cl-SCRpep treatments); Bonferroni post-test in graph ***p<0.001 (cl-HK2pep vs cl-SCRpep and cl-HK2pep vs PD150606+cl-HK2pep). Effect of calpain inhibition on mitochondrial Ca2+ levels recorded with GCAMP6f (H) in cells treated with cl-HK2pep . Data information: Experiments throughout the Figure are carried out on HeLa cells; cl-SCRpep, negative control of cl-HK2pep (2 μM each); where indicated calpain inhibitor PD150606 (50 µM each) are pre-incubated 1 h before peptide treatment.