Journal: JCI Insight
Article Title: Loss of genome maintenance is linked to mTOR complex 1 signaling and accelerates podocyte damage
doi: 10.1172/jci.insight.172370
Figure Lengend Snippet: ( A ) Schematic in vitro protocol for the induction of DNA damage. ( B ) Representative immunoblot images of gH2A.X and loading control β-tubulin of immortalized murine podocyte lysates ( n = 3). ( C ) Representative immunofluorescence images for p53 and DAPI in immortalized murine podocytes, scale bar indicating 20 μm ( n = 3). ( D ) Representative immunoblot images of p-S6RP, S6RP, and loading control protein α-actin of immortalized murine podocyte lysates; p-S6RP and S6RP gels run in parallel ( n = 3). All cells imaged or lysed after treatment with MMC or UV-C irradiation ± 10 ng/mL rapamycin or serum starvation (SS) ( n ≥ 4). ( E ) Representative immunoblot images of p-S6RP, S6RP, and loading control protein α-actin of immortalized murine podocyte lysates ( n = 3 MMC; n = 6 UV-C). All cells imaged or lysed after treatment with MMC or UV-C irradiation ± ATM inhibitor KU60019 or DNA-PK inhibitor nedisertib. ( F ) Representative immunofluorescence staining of synaptopodin (gray), p–DNA PKc (green), and DAPI (red) in sections of 9-week-old Ercc1 ctrl and pko kidneys, with quantification of SNP-positive cells with p–DNA PKc–positive nuclei per total SNP-positive cells. Yellow circles indicating positive nuclei, red circles indicating negative nuclei, scale bar indicating 50 μm (unpaired t test, n = 4–5, 10 glomeruli per sample). ( G ) Representative immunofluorescence staining of SNP (gray), p-ATM (green), and DAPI (red) in sections of 9-week-old Ercc1 ctrl and pko kidneys, with quantification of SNP-positive cells with p–ATM-positive nuclei per total SNP-positive cells. Yellow circles indicating positive nuclei, red circles indicating negative nuclei, scale bar indicating 10 μm (unpaired t test, n = 4–5, 10 glomeruli per sample). All violin plots indicate median (black) and upper and lower quartile (gray). *** P ≤ 0.001, **** P ≤ 0.0001. DNA-PK, DNA-dependent protein kinase; ATM, ataxia telangiectasia mutated serine/threonine kinase.
Article Snippet: SDS-PAGE was used for protein size separation with subsequent blotting onto PVDF membranes and visualized with enhanced chemiluminescence after incubation of the blots with corresponding antibodies: Phospho-Histone H2A.X (Ser139); Phospho-S6 Ribosomal Protein (Ser235/236) (D57.2.2E); S6 Ribosomal Protein (5G10) from Cell Signaling Technology; α-actin (JLA20) from Developmental Studies Hybridoma Bank; and β-tubulin (E7) from Developmental Studies Hybridoma Bank.
Techniques: In Vitro, Western Blot, Control, Immunofluorescence, Irradiation, Staining