Chlamydophila psittaci-negative ocular adnexal marginal zone lymphomas express self polyreactive B-cell receptors

Leukemia. 2015 Jul;29(7):1587-99. doi: 10.1038/leu.2015.39. Epub 2015 Feb 13.


The pathogenesis of Chlamydophila psittaci-negative ocular adnexal extranodal marginal zone lymphomas (OAEMZLs) is poorly understood. OAEMZLs are monoclonal tumors expressing a biased repertoire of mutated surface immunoglobulins. Antigenic activation of the B-cell receptor (BCR) may have a role in the pathogenesis of these lymphomas. We have analyzed the reactivity of recombinant OAEMZL immunoglobulins. OAEMZL antibodies reacted with self-human antigens, as demonstrated by enzyme-linked immunosorbent assays, HEp-2 immunofluorescence and human protein microarrays. All the analyzed recombinant antibodies (rAbs) exhibited polyreactivity by comprehensive protein array antibody reactivity and some rAbs also demonstrated rheumatoid factor activity. The identity of several reactive antigens was confirmed by microcapillary reverse-phase high-performance liquid chromatography nano-electrospray tandem mass spectrometry. The tested rAbs frequently reacted with shared intracellular and extracellular self-antigens (for example, galectin-3). Furthermore, these self-antigens induced BCR signaling in B cells expressing cognate surface immunoglobulins derived from OAEMZLs. These findings indicate that interactions between self-antigens and cognate OAEMZL tumor-derived BCRs are functional, inducing intracellular signaling. Overall, our findings suggest that self-antigen-induced BCR stimulation may be implicated in the pathogenesis of C. psittaci-negative OAEMZLs.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Autoantigens / immunology
  • B-Lymphocytes / immunology
  • Blotting, Western
  • Chlamydophila psittaci*
  • Chromatography, High Pressure Liquid
  • Enzyme-Linked Immunosorbent Assay
  • Eye Neoplasms / immunology*
  • Eye Neoplasms / metabolism
  • Eye Neoplasms / pathology
  • Fluorescent Antibody Technique
  • Humans
  • Immunoenzyme Techniques
  • Immunoprecipitation
  • Lymphoma, B-Cell, Marginal Zone / immunology*
  • Lymphoma, B-Cell, Marginal Zone / metabolism
  • Lymphoma, B-Cell, Marginal Zone / pathology
  • Protein Array Analysis
  • Psittacosis / microbiology
  • Receptors, Antigen, B-Cell / immunology*
  • Receptors, Antigen, B-Cell / metabolism*
  • Recombinant Proteins / immunology
  • Spectrometry, Mass, Electrospray Ionization
  • Tumor Cells, Cultured


  • Autoantigens
  • Receptors, Antigen, B-Cell
  • Recombinant Proteins