Extended Data Fig. 4: IL-8 Expression in Mouse and Human Prostate Cancer.
From: Castration-mediated IL-8 promotes myeloid infiltration and prostate cancer progression
a, Representative images of positive and negative controls (cnts: murine and bacteria probe, respectively) in Myc-CaP tumors from indicated treatment groups highlight the specificity of RNA In situ hybridization independently of treatment groups. Tumors were harvested when tumor volume reached ~500mm3 (CS group) or at the time of castration-resistance (CR). Prostate tumor tissue sections were hybridized with CF568-labeled probe sets (white) to Cxcl15, CF640-labeled anti-PanCK antibody (red), and CF488-labeled anti-CD45 antibody (green). Nuclei were counterstained with DAPI (blue). b, qRT-PCR quantification of IL-8 in AR positive castration-sensitive (LNCaP, LAPC4, and VCaP) and AR independent castration-resistant (CWR22Rv1, DU145, and PC3) human prostate cancer cell lines (n = 2 independently cultured replicates per group, repeated x2). IL-8 expression levels were normalized to mean ΔCT level in DU145 samples. c, CXCL1, CXCL2, CXCL5, and CXCL12 protein expression in human AR positive castration-sensitive LNCaP cell line (CS) and it’s isogenic castration-resistant counterpart LNCaP-abl (CR) quantified by MSD (n = 3 independently cultured replicates per group, repeated x1). d, IL-8 protein expression in LNCaP and AR-independent PC3 human prostate cancer cell lines quantified by MSD, replicates as in c. e, Treatment scheme for GFP induction with Doxycycline (DOX) in transgenic Hoxb13-rtTA | TetO-H2BGFP mice for specific isolation of benign murine prostate epithelial cells from castration-sensitive (CS), androgen-deprivation treated (pADT) non-tumor bearing mice, and ADT-treated mice that received testosterone repletion (pADT + T). f, IL-8-RISH quantification in human prostate tumor specimens from untreated (n = 20 patients) or ADT-treated (n = 15 patients; NCT01696877). Quantification was restricted to tumor areas and represented as number of positive cells per mm2. Images representative of 3 independent experiments. RISH images are 60X magnification; scale bar=100 μm. For b, Tukey’s multiple comparisons test with a single pooled variance was performed, p-values ≤ 0.0001 (****). Bar plots represent means with SEM. Unpaired two-tailed (c-d) t-tests were performed, p-values ≤ 0.0001 (****); p-values ≥ 0.05 (ns). For f a Mann-Whitney U test was used due to the non-normal data distribution observed. The box plot includes 25th to 75th of all IL-8 positive cells/mm2 values with horizontal line indicating the median values. The whiskers represent the highest values, including outliers and extremes.
