Creeping fat in Crohn's disease

What is known

• Histological examination shows a strong, consistent correlation between creeping fat and strictures, with fat-wrapping recognized as a fundamental characteristic of stricturing segments. ¹
• Activated muscularis propria cells secrete fibronectin that triggers preadipocyte migration from mesenteric fat and differentiation into adipocytes, a proposed mechanism of creeping-fat formation. ^1,2
• Viable gut microbiota translocate to mesenteric adipose; in creeping fat C. innocuum polarizes macrophages toward a pro-fibrotic M2a phenotype, supporting a protective-but-profibrotic role. ^2,3
• Creeping-fat-derived free fatty acids induce muscularis propria hyperplasia, a link between fat and intestinal stricture formation. ⁴

What is unknown / caveats

• Some sources frame creeping fat as a protective/regulatory response to bacterial translocation, others as a driver of fibrosis and disabling disease
• The retrieved material is largely reference lists and reviews, not primary mechanistic data
• Relationship between creeping fat and clinical prognosis is described as underexplored
• Whether creeping fat is primarily protective or pathogenic remains unresolved in the retrieved sources.

References

1. Ma L, He Y, Li W, Xiao M, Zhou M, Qin J, Yang H, Liu W, Zhu Q. Ultrasound Characteristics Can Predict Response to Biologics Therapy in Stricturing Crohn's Disease. Clin Transl Gastroenterol. 2024;15(8):e00738. PMID: 38976327.

2. Khan I, Holubar SD. Operative Management of Small and Large Bowel Crohn's Disease. Surg Clin North Am. 2025;105(2):247-276. PMID: 40015815.

3. Becker MAJ, Does de Willebois EMLV, Bemelman WA, Wildenberg ME, Buskens CJ. Role of the Mesentery in Crohn's Terminal Ileitis. Clin Colon Rectal Surg. 2022;35(4):316-320. PMID: 35975109.

4. Mege D, Panis Y. Unmet Therapeutic Needs: Focus on Intestinal Fibrosis Surgical Approach: Resection, Strictureplasty and Others. Dig Dis. 2017;35(1-2):38-44. PMID: 28147351.

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Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct.