Article (Scientific journals)
Effects of macrophage-dependent peroxisome proliferator-activated receptor γ signalling on adhesion formation after abdominal surgery in an experimental model.
Hong, G-S; Schwandt, T; Stein, K et al.
2015In British Journal of Surgery, 102 (12), p. 1506 - 1516
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Keywords :
PPAR gamma; RNA; Animals; Cells, Cultured; Disease Models, Animal; Laparotomy/adverse effects; Macrophages, Peritoneal/metabolism; Macrophages, Peritoneal/pathology; Male; Mice; Mice, Inbred C57BL; Microscopy, Fluorescence; PPAR gamma/biosynthesis; PPAR gamma/genetics; Peritoneal Diseases/etiology; Peritoneal Diseases/genetics; Peritoneal Diseases/metabolism; Polymerase Chain Reaction; RNA/genetics; Signal Transduction; Tissue Adhesions/genetics; Tissue Adhesions/metabolism; Tissue Adhesions/pathology; Gene Expression Regulation; Laparotomy; Macrophages, Peritoneal; Peritoneal Diseases; Tissue Adhesions; Surgery
Abstract :
[en] [en] BACKGROUND: The pathophysiology of adhesion formation after abdominal and pelvic surgery is still largely unknown. The aim of the study was to investigate the role of macrophage polarization and the effect of peroxisome proliferator-activated receptor (PPAR) γ stimulation on adhesion formation in an animal model. METHODS: Peritoneal adhesion formation was induced by the creation of ischaemic buttons within the peritoneal wall and the formation of a colonic anastomosis in wild-type, interleukin (IL) 10-deficient (IL-10(-/-) ), IL-4-deficient (IL-4(-/-) ) and CD11b-Cre/PPARγ(fl) (/fl) mice. Adhesions were assessed at regular intervals, and cell preparations were isolated from ischaemic buttons and normal peritoneum. These samples were analysed for macrophage differentiation and its markers, and expression of cytokines by quantitative PCR, fluorescence microscopy, arginase activity and pathological examination. Some animals underwent pioglitazone (PPAR-γ agonist) or vehicle treatment to inhibit adhesion formation. Anastomotic healing was evaluated by bursting pressure measurement and collagen gene expression. RESULTS: Macrophage M2 marker expression and arginase activity were raised in buttons without adhesions compared with buttons with adhesions. IL-4(-/-) and IL-10(-/-) mice were not affected, whereas CD11b-Cre/PPARγ(fl) (/fl) mice showed decreased arginase activity and increased adhesion formation. Perioperative pioglitazone treatment increased arginase activity and decreased adhesion formation in wild-type but not CD11b-Cre/PPARγ(fl) (/fl) mice. Pioglitazone had no effect on anastomotic healing. CONCLUSION: Endogenous macrophage-specific PPAR-γ signalling affected arginase activity and macrophage polarization, and counter-regulated peritoneal adhesion manifestation. Pharmacological PPAR-γ agonism induced a shift towards macrophage M2 polarization and ameliorated adhesion formation in a macrophage-dependent manner. Surgical relevance Postoperative adhesion formation is frequently seen after abdominal surgery and occurs in response to peritoneal trauma. The pathogenesis is still unknown but includes an imbalance in fibrinolysis, collagen production and inflammatory mechanisms. Little is known about the role of macrophages during adhesion formation. In an experimental model, macrophage M2 marker expression was associated with reduced peritoneal adhesion formation and involved PPAR-γ-mediated arginase activity. Macrophage-specific PPAR-γ deficiency resulted in reduced arginase activity and aggravated adhesion formation. Pioglitazone, a PPAR-γ agonist, induced M2 polarization and reduced postoperative adhesion formation without compromising anastomotic healing in mice. Pioglitazone ameliorated postoperative adhesion formation without compromising intestinal wound healing. Therefore, perioperative PPAR-γ agonism might be a promising strategy for prevention of adhesion formation after abdominal surgery.
Disciplines :
Neurology
Author, co-author :
Hong, G-S;  Department of Surgery, University Hospital of Bonn, Bonn, Germany
Schwandt, T;  Department of Surgery, University Hospital of Bonn, Bonn, Germany
Stein, K;  Department of Surgery, University Hospital of Bonn, Bonn, Germany
Schneiker, B;  Department of Surgery, University Hospital of Bonn, Bonn, Germany
Kummer, M P;  Clinical Neurosciences Unit, University Hospital of Bonn, Bonn, Germany
HENEKA, Michael  ;  Clinical Neurosciences Unit, University Hospital of Bonn, Bonn, Germany
Kitamura, K;  Department of Surgery, University Hospital of Bonn, Bonn, Germany ; Graduate School of Medicine, Kyoto University, Kyoto, Japan
Kalff, J C;  Department of Surgery, University Hospital of Bonn, Bonn, Germany
Wehner, S;  Department of Surgery, University Hospital of Bonn, Bonn, Germany ; Tytgat Institute for Liver and Intestinal Research, Academic Medical Centre, Amsterdam, The Netherlands
External co-authors :
yes
Language :
English
Title :
Effects of macrophage-dependent peroxisome proliferator-activated receptor γ signalling on adhesion formation after abdominal surgery in an experimental model.
Publication date :
November 2015
Journal title :
British Journal of Surgery
ISSN :
0007-1323
eISSN :
1365-2168
Publisher :
John Wiley and Sons Ltd, Chichester, West Sussex, England
Volume :
102
Issue :
12
Pages :
1506 - 1516
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BONFOR
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