Journal: Nature Communications
Article Title: Conditional BCL-2 Expression in Fibroblasts Promotes Persistent Pulmonary Fibrosis which is Reversible by Therapeutic BCL-2 Inhibition
doi: 10.1038/s41467-026-69865-4
Figure Lengend Snippet: a Heat maps of differential gene expression associated with regulation of cellular senescence in fibroblasts from PDGFRα-CFP/BCL-2 - and PDGFRα-CFP/BCL-2 + mice 6 weeks after bleomycin. b Senescence gene score ( n = 4 mice/group, mean +/− SEM, * p < 0.01, Brown–Forsythe and Welch’s ANOVA with Dunnett correction for multiple comparisons.) and ( c ) BCL-2 Pearson Correlation maps for 111 senescence associated genes in naïve, PDGFRα-CFP/BCL-2 - , PDGFRα-CFP/BCL-2 + fibroblasts. d – f Quantification of fibroblasts/field for p21, p16 and SA-β-gal from control and persistently fibrotic lungs from PDGFRα-CFP/BCL-2 - , PDGFRα-CFP/BCL-2 + mice ( n = 4 mice/group, mean +/− SEM of 10 individual images/mouse graphed as scatter plot with bar mean +/− SEM, *** p < 0.001, 2-tailed t test with Welch’s correction.). Immunofluorescence images for ( g ) PDGFRα (magenta) and PDGFRβ (green), ( h ) human BCL-2 (green), ( i ) p21 (yellow), ( j ) p16 (magenta) and ( k ) SA-β-gal (white). SA-β-gal, senescence associated-β-galactosidase. White arrow heads indicate shared features in serial sections. Spatial transcriptomic analysis of IPF lung. l H&E section ( m ) spatial map of cellular populations ( n ) BCL-2 expression map (red, individual transcripts) overlayed with myofibroblasts (yellow, cell boundaries) and ( o ) 10 gene senescence module ENV score. [A-C dotted line callouts are enlarged areas to show cell boundary, BCL-2 expression and senescence ENV score overlays]. p Heat maps of differential pro-fibrotic genes and senescence genes between BCL-2 + myofibroblasts and BCL-2 - myofibroblasts from the spatial transcriptomic data. q Myofibroblast cell counts between control IPF and BCL-2 + myofibroblast + counts from control and IPF spatial images (* p < 0.05 and *** p < 0.001, 2-tailed t test with Welch’s correction). r Quantification of α-SMA + myofibroblasts/field for BCL-2 in control and IPF lung sections (individual images graphed as scatter plot with bar mean +/- SEM, *** p < 0.001, 2-tailed t test with Welch’s correction). Immunofluorescent images of control and IPF lungs stained for ( s ) αSMA (magenta) and BCL-2 (green), ( t ) α-SMA (green) and p16 (magenta), ( u ) p21 (yellow), ( v ) SA-β-Gal (white). Images n = 5 subjects/group. Spatial transcript analysis n = 13 controls, n = 15 IPF Immunofluorescence panels 20X. 10 images/mouse for immunofluorescent quantitation. SA-β-gal, senescence associated-β-galactosidase. Cor coe = correlation coefficient. Source data are provided for a – f and p – r as a Source Data file.
Article Snippet: Primary antibodies for BCL-2 (BioRad #MCA1550, mouse, 1:100 Hercules, CA), Bcl-2 (Cell Signaling Technology # 3498, rabbit, 1:500), PDGFRα (Cell Signaling, #3174S rabbit, 1:100), PDGFRβ (R&D Systems #AF1032 goat, 1:100, Minneapolis, MN), GFP (which identifies CFP; AvesLab #GFP-1020, chicken, 1:200), αSMA (Sigma Aldrich #2547, mouse, 1:500), p16 INK (Abcam #ab211542 rabbit, 1:100), p21 WAF (Abcam #ab188224 rabbit, 1:250), β-galactosidase (Cell Signaling #27198 rabbit, 1:200), CCSP (Seven Hills Bioreagents #WRAB-3950 rabbit, 1:200, Cincinnati, OH), pro-SPC (Millipore #AB3786 rabbit, 1:500), Krt8 (DSHB # AB531826 rat, 1:100), CD45 (Invitrogen, 17-0451-82 rat, 1:100), CD31 (Invitrogen, #14-0311-82 rat, 1:100) were incubated overnight at 4 o C followed by incubation with fluorescently tagged goat anti mouse-A647 (A21236), donkey anti-rabbit-A555 (A31572), goat anti rat-A555 (A21434), or donkey anti goat-A647 (A21447) secondary antibodies at 1:100 dilution (Invitrogen, Carlsbad, CA).
Techniques: Gene Expression, Control, Immunofluorescence, Expressing, Staining, Quantitation Assay