Journal: Cell Communication and Signaling : CCS

Article Title: Signaling pathways regulating VDAC1 overexpression associated with apoptosis, pyroptosis, and ferroptosis

doi: 10.1186/s12964-025-02647-5

Figure Lengend Snippet: Involvement of the MAPK-p38, JNK, and CaMK-II pathways in cisplatin- and erastin-induced VDAC1 overexpression. A HeLa cells were serum-starved for 5 h, pre-incubated (2 h) with the indicated concentrations of SP203580, SP600125 or KN-62, then incubated with or without cisplatin (15 µM). After 16 h, RNA was isolated and subjected to q-RT-PCR using VDAC1 mRNA specific primers (Table S2). B , C HeLa cells were serum-starved for 5 h, pre-incubated with the indicated inhibitor (10 µM, 2 h) then incubated with or without cisplatin (10 or 15 µM, 48 h) and subjected to VDAC1 oligomerization assayed as described in the Methods section. The immunoblot with the positions of VDAC1 monomers, dimers, trimers and multimers are indicated ( B ) and the levels of VDAC1 dimers were quantified ( C ). D , E HeLa cells were serum-starved for 5 h, and pre-incubated with the JNK inhibitor, SP600125 or with the CaMK-II inhibitor, KN-62 (5 or10 µM, 2 h), then incubated with or without cisplatin (15µM, 48 h) and subjected to immunoblotting using specific antibodies against P-c-Jun, P-ATF-1 or b-actin ( D ) and their levels were quantified ( E ). F , G C6 cells were serum starved for 2 h, pre-incubated with p38-MAPK inhibitor, SB203580 (5 and 10 µM, 2 h), then incubated with or without erastin (10 µM, 24 h). Cells were subjected to immunoblotting using specific antibodies against VDAC1, P-c-Jun, P-c-Fos or P-p38. Ponceau S staining is shown as a loading control ( F ). The protein relative levels were then quantified ( G ). H-K HeLa cells were transfected with non-targeting siRNA (si-NT) or si-c-Jun (100 nM) using JetPrime ( H , I ), or with si-p38 (100 nM) using SilentFect transfection reagent ( J , K ), as described in the Methods section. At 24 h post-transfection, cells were treated with cisplatin (15 µM, 48 h) and subjected to immunoblotting for P-c-Jun, P-p38, P-c-Fos or b-actin expression using specific antibodies (H, J) . Protein expression levels were quantified ( I , K ). Cell death was analyzed by PI standing and FACS analysis and is presented in the bottom of the blots ( H , J ). Results are the means ± SEM (n = 3). ∗p ≤ 0.05, ∗∗p ≤ 0.01, ∗∗∗p ≤ 0.001; NS = non-significant

Article Snippet: The nucleotides in italic were 2′-O-methyl modified. si-c-JUN (CST-6203 S) and si-p38-MAPK (CST-6564 S) were purchased from Cell Signaling Technology (Danvers, MS).

Techniques: Over Expression, Incubation, Isolation, Reverse Transcription Polymerase Chain Reaction, Western Blot, Staining, Control, Transfection, Expressing