Osteopontin ablation attenuates progression of colitis in TNBS model.

INTRODUCTION

OPN has been implicated in the inflammatory response to Crohn's disease. We hypothesized that OPN deficiency protects against different stages of TNBS-induced colitis in a modified model that mimics Crohn's disease.

MATERIAL AND METHODS

OPN-deficient and wildtype mice were treated intracolonically with TNBS and euthanized during acute, sub-acute and chronic colitis.

RESULTS

TNBS-treated wildtype mice developed severe colitis, but OPN-deficient mice were significantly protected. Wildtype mice showed significant infiltration of inflammatory cells including macrophages, and colonic transmural thickening that progressed to strictures, increased matrix collagen deposits (X2 fold), and granuloma formation. These pathological findings were partially attenuated by OPN deficiency. The inflammatory marker, serum amyloid A (SAA), markedly increased in sub-acute stages regardless of OPN status. Conversely, OPN deficiency significantly reduced concentration of SAA in the acute and chronic stages. Secretory OPN was upregulated particularly in acute stage in wildtypes (P < 0.001) and as expected not present in OPN-deficient animals. Flow cytometry analysis of splenic macrophages revealed significant increases in scavenger receptors, macrosialin and F4/80 markers' expression in wildtypes.

CONCLUSIONS

Our data support the role of OPN in induction of inflammation and establishment of chronic colitis. Therefore, OPN may represent a target for therapeutic intervention in Crohn's disease.