Journal: International Journal of Molecular Sciences
Article Title: MAGED2 Depletion Promotes Stress-Induced Autophagy by Impairing the cAMP/PKA Pathway
doi: 10.3390/ijms241713433
Figure Lengend Snippet: MAGED2 depletion induces autophagy under hypoxic conditions. HEK293 cells were transfected with control or MAGED2 siRNAs. Upon confluency 24–48 h post transfection, cells were exposed to physical hypoxia overnight. Total cell lysates were separated by SDS-PAGE and blotted for p62, ATGs and LC3B detection. Blotting for HIF-1α- was carried out to confirm its induction under hypoxia. Immunocytochemistry was carried out in parallel in HEK293 cells transfected and stressed similarly prior to incubation with LC3B antibody. ( A ) Representative Western blot images demonstrate decreased p62 levels, elevated ATG5-ATG12 complex levels and a higher LC3II abundance upon MAGED2 depletion in the presence of physical hypoxia. Leupeptin assay confirmed the induced autophagy where the highest LC3II accumulation corresponded to cells where MAGED2 is knocked down. ( B ) Densitometric analysis of p62, ATG5-ATG12 conjugate and LC3II from the immunoblot A. All samples shown on individual blots are from the same experiment and each blot represents an example of three independent experiments. ( C ) Representative immunofluorescence images displaying LC3B staining in control and MAGED2-transfected HEK293 cells under physical hypoxia. Scale bar 5 µm. ( D ) This notion was further supported by qRT-PCR, where the quantity of ATG5 and ATG12 was determined in HEK293 cells transfected with control or MAGED2 siRNAs and exposed to hypoxia. Total mRNA was isolated, and the relative mRNA amounts of both genes were measured. Statistical significance was determined by unpaired Student’s t -test. Bar graphs show mean ± SEM, * p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001.
Article Snippet: Anti-MAGED2 rabbit raised against this peptide (QVQENQDTRPKVKAK) , Eurogentec (Cologne, Germany) , .
Techniques: Transfection, SDS Page, Immunocytochemistry, Incubation, Western Blot, Immunofluorescence, Staining, Quantitative RT-PCR, Isolation