CCL2 and irritable bowel syndrome: Apical media fractions from T84 cells exposed to PI-IBS associated C. jejuni strains showed lower chemokine (C–C motif) ligand 2 (CCL2) or monocyte chemoattractant protein-1 concentrations compared to the media fractions from cells exposed to control strains (PI-IBS: 1.81 (0.96) pg/mL vs. control: 2.84 (1.49), p = 0.004) (Fig. 6b), while basolateral concentrations were not different (Supplementary Fig. 3B).