Pituitary

, Volume 20, Issue 3, pp 301–310 | Cite as

Anti-pituitary antibodies against corticotrophs in IgG4-related hypophysitis

  • Naoko Iwata
  • Shintaro Iwama
  • Yoshihisa Sugimura
  • Yoshinori Yasuda
  • Kohtaro Nakashima
  • Seiji Takeuchi
  • Daisuke Hagiwara
  • Yoshihiro Ito
  • Hidetaka Suga
  • Motomitsu Goto
  • Ryoichi Banno
  • Patrizio Caturegli
  • Teruhiko Koike
  • Yoshiharu Oshida
  • Hiroshi Arima
Article

Abstract

Purpose

IgG4-related disease is a systemic inflammatory disease characterized by infiltration of IgG4-positive plasma cells into multiple organs, including the pituitary gland. Autoimmunity is thought to be involved in the pathogenesis of IgG4-related disease. The diagnosis of IgG4-related hypophysitis (IgG4-RH) is difficult because its clinical features, such as pituitary swelling and hypopituitarism, are similar to those of other pituitary diseases, including lymphocytic hypophysitis and sellar/suprasellar tumors. The presence and significance of anti-pituitary antibodies (APA) in IgG4-RH is unclear.

Methods

In this case-control study, we used single indirect immunofluorescence on human pituitary substrates to assess the prevalence of serum APA in 17 patients with IgG4-RH, 8 control patients with other pituitary diseases (lymphocytic infundibulo-neurohypophysitis, 3; craniopharyngioma, 2; germinoma, 3), and 9 healthy subjects. We further analyzed the endocrine cells targeted by the antibodies using double indirect immunofluorescence.

Results

APA were found in 5 of 17 patients with IgG4-RH (29%), and in none of the pituitary controls or healthy subjects. The endocrine cells targeted by the antibodies in the 5 IgG4-RH cases were exclusively corticotrophs. Antibodies were of the IgG1 subclass, rather than IgG4, in all 5 cases, suggesting that IgG4 is not directly involved in the pathogenesis. Finally, antibodies recognized pro-opiomelanocortin in 2 of the cases.

Conclusions

Our study suggests that autoimmunity is involved in the pathogenesis of IgG4-RH and that corticotrophs are the main antigenic target, highlighting a possible new diagnostic marker for this condition.

Keywords

IgG4 Hypophysitis Autoantibody Autoantigen Corticotroph POMC 

Supplementary material

11102_2016_780_MOESM1_ESM.docx (33 kb)
Supplementary material 1 (DOCX 32 KB)
11102_2016_780_MOESM2_ESM.docx (1016 kb)
Supplementary Figure 1. MRI findings in patients with IgG4-RH. MRI images showed both pituitary gland enlargement and stalk thickening (A) (B) or stalk thickening only (C) (D) in patients with IgG4-RH. Representative images from Pt 3 (A), Pt 11 (B), Pt 2 (C), and Pt 8 (D) (DOCX 1017 KB)
11102_2016_780_MOESM3_ESM.docx (511 kb)
Supplementary Figure 2. Evaluation of pituitary functions in patients with IgG4-RH. Testing of pituitary function included stimulation tests with corticotropin-releasing hormone (CRH), thyrotropin-releasing hormone (TRH), growth hormone-releasing hormone (GRH) or growth hormone-releasing peptide 2 (GHRP2), or luteinizing hormone-releasing hormone (LH-RH). The gonadal axis was impaired in Pt 8 (A). The GH axis and gonadal axis were impaired in Pt 1 (B). The TSH axis and gonadal axis were impaired in Pt 3 (C) (DOCX 510 KB)
11102_2016_780_MOESM4_ESM.tif (19.6 mb)
Supplementary Figure 3. Double indirect immunofluorescence (IIF) analysis using rat pituitary gland (A), human posterior pituitary gland (B), rat hypothalamus (C), and monkey hypothalamus (D) as substrate. A. Anti-pituitary antibodies (APA) did not bind to anterior or posterior pituitary tissue from rat (center panel). The posterior pituitary is labeled red using anti-arginine vasopressin (AVP) antibody (left panel). B. Posterior pituitary, labeled by anti-AVP antibody (left panel). Serum from a patient with IgG4-RH does not contain antibodies to the posterior pituitary (center panel). C. Rat hypothalamic supraoptic nucleus (SON), labeled by anti-AVP antibody (left panel). Serum from a patient with IgG4-RH does not contain antibodies to the rat SON (center panel). D. Monkey hypothalamus section including SON or paraventricular nucleus (PVN), labeled by anti-AVP antibody (left panel). Serum from a patient with IgG4-RH does not contain antibodies to the monkey SON or PVN (center panel). Representative images from Pt 1 (A), Pt 2 (B), Pt 4 (C) and Pt 14 (D) (TIF 20083 KB)
11102_2016_780_MOESM5_ESM.tif (5.6 mb)
Supplementary Figure 4. Western blot of GH protein in the serum of a healthy control. GH protein was detected around 20kD using anti-GH antibody as a positive control (second lane) and in the serum from healthy control (third lane) (TIF 5704 KB)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Naoko Iwata
    • 1
  • Shintaro Iwama
    • 1
    • 2
  • Yoshihisa Sugimura
    • 1
  • Yoshinori Yasuda
    • 1
  • Kohtaro Nakashima
    • 1
  • Seiji Takeuchi
    • 1
  • Daisuke Hagiwara
    • 1
  • Yoshihiro Ito
    • 1
  • Hidetaka Suga
    • 1
  • Motomitsu Goto
    • 1
  • Ryoichi Banno
    • 1
  • Patrizio Caturegli
    • 3
    • 4
  • Teruhiko Koike
    • 2
  • Yoshiharu Oshida
    • 2
  • Hiroshi Arima
    • 1
  1. 1.Department of Endocrinology and DiabetesNagoya University Graduate School of MedicineNagoyaJapan
  2. 2.Research Center of Health, Physical Fitness and SportsNagoya UniversityNagoyaJapan
  3. 3.Department of PathologyJohns Hopkins UniversityBaltimoreUSA
  4. 4.Feinstone Department of Molecular Microbiology and ImmunologyJohns Hopkins Bloomberg School of Public HealthBaltimoreUSA

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