Journal of Gastroenterology

, Volume 45, Issue 7, pp 732–741

Analysis of regulatory T cells and IgG4-positive plasma cells among patients of IgG4-related sclerosing cholangitis and autoimmune liver diseases

  • Masanori Koyabu
  • Kazushige Uchida
  • Hideaki Miyoshi
  • Yutaku Sakaguchi
  • Toshiro Fukui
  • Hiroki Ikeda
  • Makoto Takaoka
  • Junko Hirohara
  • Akiyoshi Nishio
  • Yoshiko Uemura
  • Shinji Uemoto
  • Kazuichi Okazaki
Original Article—Liver, Pancreas, and Biliary Tract

Abstract

Objectives

Patients with autoimmune pancreatitis (AIP) characteristically show elevated serum levels of immunoglobulin G4 (IgG4) and abundant infiltration of IgG4-positive plasmacytes in the involved organs. The most common involved organ showing extrapancreatic lesions is the bile duct, which exhibits sclerosing cholangitis (SC). However, the role of IgG4 in the development of IgG4-related SC (IgG4-SC) remains unclear. To clarify the role of IgG4 in IgG4-SC, we have performed an immunohistochemical analysis of the bile duct.

Methods

Laboratory and immunohistochemical findings of liver biopsy specimens obtained from patients with IgG4-SC, primary sclerosing cholangitis (PSC), autoimmune hepatitis (AIH), and primary biliary cirrhosis (PBC) were compared. The biopsy specimens were first stained with anti-IgG1, anti-IgG4, and anti-Foxp3 (forkhead box P3) antibodies, and the ratio of IgG4-, IgG1-, and Foxp3-positive cells, respectively, to infiltrated mononuclear cells (IgG4/Mono, IgG1/Mono, Foxp3/Mono) was assessed.

Results

The ratio of IgG4/IgG1-positive plasma cells was significantly higher in specimens obtained from patients with IgG4-SC than in those from patients with PSC, AIH, and PBC. The Foxp3/Mono ratio in patients with PBC was significantly higher than that in patients with IgG4-SC and PSC. In patients with IgG4-SC, the number of Foxp3-positive cells was significantly correlated with the number of IgG4-positive cells; in the other patient groups, there was no correlation.

Conclusions

The IgG4/IgG1 ratio in the liver may be a useful marker for differential diagnosis of IgG4-SC and PSC. In IgG4-SC, abundant infiltration of regulatory T cells (Tregs) may affect the switching of B cells to IgG4-producing plasmacytes, and there is a possibility that the function of Tregs is different in IgG4-SC and other liver diseases (PSC, AIH, and PBC).

Keywords

Autoimmune pancreatitis IgG4 IgG4-related diseases Regulatory T cell Sclerosing cholangitis 

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Copyright information

© Springer 2010

Authors and Affiliations

  • Masanori Koyabu
    • 1
  • Kazushige Uchida
    • 1
  • Hideaki Miyoshi
    • 1
  • Yutaku Sakaguchi
    • 1
  • Toshiro Fukui
    • 1
  • Hiroki Ikeda
    • 1
  • Makoto Takaoka
    • 1
  • Junko Hirohara
    • 1
  • Akiyoshi Nishio
    • 1
  • Yoshiko Uemura
    • 2
  • Shinji Uemoto
    • 3
  • Kazuichi Okazaki
    • 1
  1. 1.Division of Gastroenterology and Hepatology, The Third Department of Internal MedicineKansai Medical UniversityMoriguchiJapan
  2. 2.Department of Clinical Sciences and Laboratory MedicineKansai Medical UniversityMoriguchiJapan
  3. 3.Division of Hepato-Pancreato-Biliary Surgery and Transplantation, Department of Surgery, Graduate School of MedicineKyoto UniversityKyotoJapan

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