Abstract
Background
Enhanced cell expression of MAdCAM-1 is critical in tissue recruitment of lymphocytes in response to stimuli expressing the α4β7 integrin. MAdCAM-1 is well characterized in gut mucosa with emerging evidence of hepatic expression.
Aims
(i) Compare quantitative/semi-quantitatively MAdCAM-1 expression in relation to early and advanced liver diseases (ii) Define the fine structure of vascular plexuses/lymphatics in the portal tract on which MAdCAM-1 is expressed.
Methods
Using alkaline phosphatase anti-alkaline phosphatase methodology on paraffin embedded tissue sections (n = 28) from cirrhotic individuals who underwent orthotopic liver transplant, we evaluated MAdCAM-1 expression and compared with pre-cirrhotic, fulminant hepatitis B, and non-cirrhotic portal hypertension tissue sections. The positive controls included normal colon tissue with negative controls without primary antibody and isotype-matched purified IgG. We developed a real time PCR to quantify levels of MAdCAM-1 mRNA in our samples.
Results
MAdCAM-1 was expressed in 27/28 of the cirrhotic sections, localized primarily to septal areas within (i) endothelium of the peribiliary vascular plexus (PBP) (ii) lymphoid aggregates, with absence from normal, non-cirrhotic portal hypertension and pre-cirrhotic livers. There was significant upregulation of MAdCAM-1 mRNA in cirrhosis (p < 0.011), consistent with immunohistochemical analysis.
Conclusions
MAdCAM-1 is up-regulated in cirrhosis with expression on PBP and lymphoid aggregates. MAdCAM-1 is likely to contribute to the localization and recruitment of α4β7 lymphocytes during the pathogenesis of cirrhosis. MAdCAM-1 could be a useful marker of advanced liver disease. Further studies with respect to the expression of MAdCAM-1 in the presence of reversible and non-reversible stages of liver disease may be of merit.
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Acknowledgments
A. A. was supported by a Wellcome Trust Training Fellowship, Royal College of Physicians London Sheila Sherlock Hepatology Travelling Fellowship, St Johns Ambulance Trust, Digestive Diseases Foundation/Tana Trust Project grants and the National Institute of Health and Research (NIHR). The work was approved by The Royal Free Hospital Ethics Committee (Ethics ID 5441, Project ID 5441). We are grateful to Dr Kerjaschki, Dept of Clinical Pathology, University of Vienna for the gift of antipodoplanin antibody.
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Ala, A., Brown, D., Khan, K. et al. Mucosal Addressin Cell Adhesion Molecule (MAdCAM-1) Expression Is Upregulated in the Cirrhotic Liver and Immunolocalises to the Peribiliary Plexus and Lymphoid Aggregates. Dig Dis Sci 58, 2528–2541 (2013). https://doi.org/10.1007/s10620-013-2755-1
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DOI: https://doi.org/10.1007/s10620-013-2755-1