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Is Crohn's creeping fat an adipose tissue?

AbstractBACKGROUND:
In human pathology, the "creeping fat" (CF) of the mesentery is unique to Crohn's disease (CD). CF is usually referred to as an ectopic extension of mesenteric adipose tissue (MAT). However, since no animal model developing CF has ever been established, very little is known about this type of fat-depot expansion and its role in the development of the disease.
METHODS:
We developed and standardized an experimental protocol in mice that reproducibly induces CF development when a severe colonic inflammation is obtained by intracolonic instillation of DNBS.
RESULTS:
Macro-microscopic observations revealed a fatty appearance of CF. Yet when compared to MAT from the same animals, CF contains very little triglycerides, few adipocytes, and we observed a very low expression and protein levels of both adipose markers (hormone-sensitive lipase, perilipin) and adipocytokines (leptin, adiponectin). The decreased expression of perilipin in CF was also observed by immunohistochemistry. Conversely, the expression of proinflammatory and fibrous markers (Pref-1) was much higher in CF than in MAT. These observations were fully consistent with those made on CF recovered from five CD patients and compared with subcutaneous and mesenteric fat from the same patients.
CONCLUSIONS:
Altogether, this work reports an original experimental mice model of CF. In this model we establish for the first time that CF only occurs in severe colonic inflammation and shows an inflammatory, fibrous but not an adipose pattern.
AuthorsIsabelle Olivier, Vassilia Théodorou, Philippe Valet, Isabelle Castan-Laurell, Hervé Guillou, Justine Bertrand-Michel, Christel Cartier, Valérie Bezirard, Robert Ducroc, Jean-Pierre Segain, Guillaume Portier, Sylvain Kirzin, Jacques Moreau, Jean-Pierre Duffas, Laurent Ferrier, Hélène Eutamène
JournalInflammatory bowel diseases (Inflamm Bowel Dis) Vol. 17 Issue 3 Pg. 747-57 (Mar 2011) ISSN: 1536-4844 [Electronic] England
PMID20684014 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2010 Crohn's & Colitis Foundation of America, Inc.
Chemical References
  • Lipids
  • RNA, Messenger
  • 2,4-dinitrofluorobenzene sulfonic acid
  • Dinitrofluorobenzene
  • Peroxidase
Topics
  • Adipose Tissue (metabolism, pathology)
  • Animals
  • Blotting, Western
  • Body Weight
  • Colitis (chemically induced, metabolism, pathology)
  • Crohn Disease (metabolism, pathology)
  • Dinitrofluorobenzene (analogs & derivatives, toxicity)
  • Enzyme-Linked Immunosorbent Assay
  • Humans
  • Immunoenzyme Techniques
  • Lipids
  • Male
  • Mesentery
  • Mice
  • Mice, Inbred BALB C
  • Peroxidase (metabolism)
  • RNA, Messenger (genetics)
  • Reverse Transcriptase Polymerase Chain Reaction

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