CD1d^hiCD5⁺ B cells differentiate into antibody-secreting cells under the stimulation with calreticulin fragment

Abstract

Calreticulin (CRT) is a multifunctional molecule in both intracellular and extracellular environment. We have previously found that a recombinant CRT fragment (rCRT/39-272) could modulate T cell-mediated immunity in mice via activation and expansion of CD1d^hiCD5⁺ B cells as well as induction of CRT-specific regulatory antibodies. Antibody secreting cells (ASCs) are terminally differentiated B cells responsible for producing antibodies to participate in positive immune response as well as immune regulation. In this study, we demonstrate that rCRT/39-272 differentiates murine CD1d^hiCD5⁺ B cells into ASCs marked by increased expression of plasma cell-associated transcription factors and production of polyreactive antibodies against DNA and CRT in vitro. Intraperitoneal administration of rCRT/39-272 augmented differentiation of CD1d^hiCD5⁺ B cells into ASCs in na?ve mice or mice with experimental autoimmune encephalomyelitis. Thus, we propose that ASC differentiation and subsequent antibody production of CD1d^hiCD5⁺ B cells are key steps in CRT-mediated immunoregulation on inflammatory T cell responses.

Keywords

calreticulin / regulatory B cells / antibody secreting cells

References

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