Induction of a fibrogenic response in mouse colon by overexpression of monocyte chemoattractant protein 1.

Abstract:

BACKGROUND AND AIMS:Monocyte chemoattractant protein 1 (MCP-1) is increased transmurally in inflammatory bowel disease (IBD). Although MCP-1 is considered to play an important role in fibrotic disease in other organs, the role of MCP-1 in gut fibrosis is unknown. We investigated the fibrotic potential of MCP-1 in the gut by overexpressing this chemokine in the mouse colorectal wall. METHODS:Intramural gene transfer by direct injection of adenovector into the mouse rectal wall was established. C57BL/6 and Rag2(-/-) (B and T cell deficient) mice received 2.5 x 10(9) plaque forming units of an adenovector encoding murine MCP-1 (AdMCP-1) or control virus (AdDL70) via intramural injection. Mice were killed at various time points and tissues were obtained for histopathological and biochemical analysis. RESULTS:AdMCP-1 significantly increased collagen production in the colorectum and this was associated with significant elevation of transforming growth factor beta (TGF-beta) and tissue inhibitor of metalloproteinase (TIMP-1) protein. Transmural collagen deposition was observed after AdMCP-1 administration, and was accompanied by CD3+ T cells, F4/80+ macrophages, and vimentin+ cell infiltrates. Collagen was differentially distributed, with type I deposited in the muscularis mucosa and muscularis propria and type III in the submucosa and myenteric plexus. AdMCP-1 failed to induce collagen overproduction in immunodeficient Rag2(-/-) mice. CONCLUSION:These findings suggest that MCP-1 can induce fibrosis in the gut and that this process involves interaction between T cells and vimentin positive fibroblasts/myofibroblasts, as well as the subsequent upregulation of TGF-beta and TIMP-1 production. This model provides a basis for considering MCP-1 in the pathogenesis of strictures in IBD.

journal_name

Gut

journal_title

Gut

authors

Motomura Y,Khan WI,El-Sharkawy RT,Verma-Gandhu M,Verdu EF,Gauldie J,Collins SM

doi

10.1136/gut.2005.068429

keywords:

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

662-70

issue

5

eissn

0017-5749

issn

1468-3288

pii

gut.2005.068429

journal_volume

55

pub_type

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