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  • Poster presentation
  • Open Access

Emperipolesis and cell death in NOD2-related Blau Syndrome and Crohn’s disease

  • 1Email author,
  • 2,
  • 3,
  • 4,
  • 5,
  • 6,
  • 4,
  • 7,
  • 8,
  • 1,
  • 9,
  • 1,
  • 1,
  • 1 and
  • 1
Pediatric Rheumatology20119 (Suppl 1) :P293

  • Published:


  • Cell Death
  • Cell Survival
  • Giant Cell
  • Typical Feature
  • Immunohistochemical Study


Blau Syndrome (BS), a rare autoinflammatory disease characterized by non-caseating granulomas, is caused by gain-of-function mutations in NOD2. Crohn’s disease (CD) is associated with intestinal granulomas, and SNPs in NOD2. Emperipolesis, the ‘inside round about wandering’ of lymphocytes within other cells is a typical feature of Rosai-Dorfman disease, and seen occasionally in malignancies. Cell survival and cell death are possible outcomes for both the engulfed and engulfing cells.


To investigate emperipolesis and cell death in BS and CD granulomas.


Morphological and immunohistochemical study of granulomas was undertaken in 8 BS and 7 pediatric CD biopsies, using H&E and immunohistochemistry for leukocyte markers (CD68, CD4, CD8, CD20), cytokines (IFNγ, IL6, IL10, IL17, TGFβ, TNFα) and death-proteins (Bcl2, Fas, FasL, activated caspase 3).


All BS biopsies showed polycyclic granulomas with large lymphocytic coronas and extensive emperipolesis of lymphocytes within multinucleated giant cells (MGCs). This was associated with macrovesicular/microvesicular degeneration of lymphocytes inside MGCs (Fig1a), and MGC death (Fig1b). Emperipolesis selectively involved CD4+ T cells. In addition, vesicles and degenerative remnants inside MGCs stained strongly for IL-6 and IL-17. A moderate expression of Bcl2 was present, Fas and FasL expression were seen in emperipoletic lymphocytes and MGCs but caspase 3 was virtually absent. In contrast, CD biopsies demonstrated simple isolated granulomas with subtle lymphocytic coronas; emperipolesis was sporadically found in a few biopsies, and was associated with crystalline inclusions, but not with MGC death.


Emperipolesis of CD4+lymphocytes is an important feature of BS and is associated with MGC death. NOD2 mutations causing NF-κ B hyperactivation and influencing autophagy pathways may be involved. In CD with NOD2-SNPs, emperipolesis is exceptional and crystalline inclusions are present. (Figure 1)
Figure 1
Figure 1

Figure 1

Authors’ Affiliations

Leuven Univesity Hospital, Belgium
DuPont Children’s Hospital, Wilmington, US
Hospital Universitario de Gran Canaria, Spain
Hôpital Necker, Paris, France
AOU Meyer and University of Florence, Italy
University Hospital Zagreb, Croatia
Leiden University Medical Center, The Netherlands
Centre Hospitalier Luxembourg, Luxembourg
Casey Eye Institute, Portland, Oregon, USA


© Janssen et al; licensee BioMed Central Ltd. 2011

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.