WISP1 Drives Intestinal Fibrosis in Crohn's Disease via Metabolic and Rho/ROCK/MRTF-Mediated Cytoskeletal Remodeling.

BACKGROUND AND AIMS: Intestinal fibrosis remains a debilitating complication of Crohn's disease (CD). Canonical WNT signaling and WISP1 are linked to tissue remodeling, but their role in intestinal fibrosis remains unclear. This study aims to elucidate how WISP1 regulates fibroblast activation, metabolic reprogramming, and extracellular matrix (ECM) remodeling as a novel target for stricturing CD.

METHODS

Matched fibrotic, inflamed, and nonfibrotic ileal tissue from patients with CD was analyzed using bulk RNA sequencing, spatial transcriptomics, and lipidomics. Primary human intestinal fibroblasts were used for in vitro assays including fatty acid oxidation (FAO), ECM analysis, metabolic flux profiling, and proteome/secretome analysis with or without WISP1 stimulation. A WISP1-neutralizing antibody was tested in a murine fibrosis model.

RESULTS

WISP1 was highly expressed in fibrotic ileum. Spatial transcriptomics revealed fibroblast heterogeneity, with WISP1+ and WNT-associated subsets enriched in fibrotic regions and displaying pro-fibrotic/glycolytic signatures. Histologically, ECM deposition and lipid accumulation were key features in CD fibrosis. WISP1 treatment in vitro shifted fibroblast metabolism from FAO to glycolysis, Reactive oxygen species production, promoted adipokine secretion, and induced lipid accumulation. Inhibition of FAO promoted ECM deposition, while PPARα activation restored FAO and reduced collagen production, linking metabolism to fibrogenesis. WISP1-driven fibrosis involved the RHO/ROCK/MRTFA pathway, supported by increased MRTFA/SRF signatures in fibrotic tissue. In vivo, WISP1 neutralization reduced collagen deposition, ECM complexity, inflammation, and MRTF target gene expression.

CONCLUSIONS

WISP1 links WNT signaling, cytoskeletal remodeling, and metabolism to drive fibroblast-mediated fibrosis in CD. Its neutralization ameliorates fibrotic and inflammatory features, positioning WISP1 as a promising antifibrotic target.