interleukin-8 and Diverticulitis

Colonic lamina propria fibroblasts (CLPFs) play an important role in the pathogenesis of fibrosis and strictures in Crohn's disease.. To identify colonic epithelial cell (CEC)-derived factors that activate CLPFs.. Primary human CECs and CLPFs were isolated from control mucosa and interleukin 8 (IL8) of CLPF cultures was quantified by ELISA. Activation of nuclear factor kappaB (NF-kappaB) was shown, and translocation of NF-kappaB was inhibited by a dominant-negative IkappaB-expressing adenovirus. The major CLPF-activating and IL8 inducing protein was purified using fast-performance liquid chromatography (HiPrep 16/60 Sephacryl S-200 High Resolution Column) and sodium dodecyl sulphate gel electrophoresis.. A considerable increase in IL8 secretion by CLPFs cultured in CEC-conditioned media compared with that in unconditioned media (155.00 (10.00) pg/microg v 1.434 (0.695) pg/microg) was found. The effect of CEC-conditioned media on CLPF IL8 secretion was NF-kappaB dependent. A protein or DNA array confirmed the involvement of NF-kappaB and activator protein-1. Purification of a candidate band isolated with the use of sodium dodecyl sulphate-polyacrylamide gel electrophoresis and subsequent sequencing showed soluble galectin-3 to be a strong CLPF-activating factor. Depletion of galectin-3 from conditioned media by immunoprecipitation abolished the CLPF stimulatory effect.. Using a classical biochemical approach, soluble galectin-3 was identified as a strong activator of CLPFs produced by CEC. Galectin-3 induced NF-kappaB activation and IL8 secretion in these cells and may be a target for future therapeutic approaches to reduce or avoid stricture formation.

Topics: Adult; Aged; Aged, 80 and over; Caco-2 Cells; Cell Line; Cells, Cultured; Colon; Colorectal Neoplasms; Culture Media, Conditioned; Diverticulitis; Epithelial Cells; Female; Fibroblasts; Galectin 3; HT29 Cells; Humans; Interleukin-8; Intestinal Diseases; Male; Middle Aged; Mucous Membrane; NF-kappa B; Transcription Factor AP-1