4.8 Article

Revisiting the Coreceptor Function of Complement Receptor Type 2 (CR2, CD21); Coengagement With the B-Cell Receptor Inhibits the Activation, Proliferation, and Antibody Production of Human B Cells

Journal

FRONTIERS IN IMMUNOLOGY
Volume 12, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2021.620427

Keywords

B cell; CR2 (CD21); coreceptor; Ca2+ response; inhibition; proliferation; activation marker; cytokine and Ig-production

Categories

Funding

  1. National Research Fund (National Research, Development and Innovation Office) [K112011]
  2. Hungarian Academy of Sciences (MTA)
  3. National Research, Development, and Innovation Office [TKP2020-IKA-05]
  4. grant Szechenyi 2020 [VEKOP-2.3.3-15-2017-00021]

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On human B cells, coengagement of CR2 and BCR inhibits activation marker expression, cytokine production, proliferation, and antibody production, in contrast to mice.
The positive coreceptor function of complement receptor type 2 [CR2 (CD21)] on B cells is generally accepted, although its role in the enhancement of antibody production had only been proven in mice. The importance of this phenomenon prompted reinvestigation of the functional consequences of coclustering CD21 and the B cell receptor (BCR) on primary human cells. We found that, at non-stimulatory concentrations of anti-IgG/A/M, coclustering the BCR and CR2 enhanced the Ca2+ response, while activation marker expression, cytokine production, proliferation, and antibody production were all inhibited upon the coengagement of CR2 and BCR on human B cells. Thus, the textbook dogma claiming that C3d acts as an adjuvant to enhance humoral immunity is relevant only to mice and not to humans.

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