Positive staining cut-off was determined in comparison to the control isotype (clones 27–35; BD Biosciences) following the manufacturer’s instructions

(BD Biosciences). For each patient, genomic DNA was isolated by the phenol–chloroform method [21] from a whole blood sample collected on the day of the liver biopsy. selleck kinase inhibitor Twenty nanograms of DNA were used to assay CCL2 rs1024611 A > G with the TaqMan assay ID C_2590362_10 and CCR2 190 A/G rs1799864 assays (Applied Biosystems, Foster City, CA, USA) on a LightCycler® 480-real-time PCR System (Roche Diagnostics GmbH, Mannheim, Germany). We included DNA samples of known genotypes as internal positive and negative (water) controls to secure the genotyping procedure. Plates were run as follows: initial denaturation and enzyme activation at 95°C for 5 min, followed by 45 cycles of denaturation at 95°C for 15 s and annealing/extension at 60°C for 30 s. CCL2 rs1024611 polymorphism was determined by an allelic discrimination assay run on the LightCycler® 480-System

(Roche Diagnostics). Allele frequencies were in Hardy–Weinberg equilibrium. Data are expressed as medians (minimum–maximum). Multiple comparisons were performed using the Kruskal–Wallis test. The Mann–Whitney U-test was then used for Talazoparib post-hoc analysis. Non-parametric correlations were performed using the Spearman test. Results are shown as box-plots. Genotype frequencies are reported with their group percentages. A two-sided χ2 test was used for comparison of qualitative variables. Kaplan–Meir survival curves were compared using the log-rank test. A P-value <0·05 was considered statistically significant. Calculations were performed with spss version 17·0 software (Chicago, IL, USA). CCL2 plasma levels were increased in patients with ALD [229·7 (20·4–1563)

pg/ml; n = 122] compared to healthy subjects (HS) [139 (61·4–294·1) pg/ml; n = 10] (P = 0·003). Among ALD patients, those with AH had higher CCL2 plasma levels [284·5 (74·9–1563) pg/ml; n = 73] than those without AH [188·4 (20·4–523·2) pg/ml; n = 49] (P < 0·001), Fig. 1a. Patients with severe AH (Mdf ≥ 32) had higher CCL2 plasma levels than those with non-severe AH [368·2 (77·8–1563) pg/ml; n = 34]versus[245·8 (74·9–1371·4) pg/ml; n = 39] (P = 0·016), Fig. 1b. No difference in CCL2 plasma SPTLC1 levels was observed between patients with cirrhosis [226·6 (20·4–1563) pg/ml; n = 109] and those without [280·9 (109·1–523·2) pg/ml; n = 13] (P = 0·526). CCL2 plasma concentrations showed an association with parameters of liver disease severity (Table 2a). We also performed a qRT–PCR for CCL2 on mRNA extracts obtained from transjugular liver biopsies. CCL2 plasma levels were correlated with liver CCL2 mRNA (r = 0·288 P = 0·033). Liver CCL2 mRNA levels were higher in patients with AH [6·4 102 (44–1·1 104) mRNA copies/105 copies HPRT] than in those without AH [2·2 102 (3·5-2·4 103) mRNA copies/105 copies HPRT] (P < 0·005), Fig. 1c.