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The Journal of Immunology, Vol 152, Issue 11 5381-5391, Copyright © 1994 by American Association of Immunologists

ARTICLES

Influenza virus hemagglutinin induces differentiation of mature resting B cells and growth arrest of immature WEHI-231 lymphoma cells

O Rott and E Cash
INSERM U.283, Cochin Hospital, Paris, France.

We have investigated the functional requirements for the B cell "mitogenicity" of the influenza virus hemagglutinin (HA). Murine B cell proliferative responses were inducible by either infectious or inactivated virus, and by infected, paraformaldehyde-fixed cells. Viruses of the 12 different HA-subtypes displayed marked differences in their activation potential, classifying them as high (H2, H4, H6, H12), medium (H3, H5, H8, H9), or low (H1, H7, H10, H11) B cell activators. HA-mediated proliferation of resting B cells induced a vigorous Ig synthesis, with a predominance of IgG2b, IgG3, and IgM production. In this activation mode the B cell receptor (BCR) complex seems to be involved because 1) virus-triggered B cell proliferation was blocked by anti-Ig Abs, 2) B cell responses could be competitively inhibited by unfractionated high dose Igs, and 3) addition of BCR-modulating anti- CD45 mAb abrogated subsequent stimulation by HA. Furthermore, 4) influenza viruses were able to induce a growth arrest in the anti-mu sensitive B cell line WEHI-231. Most interestingly, the "tolerogenic" capacity correlated with the B cell stimulatory subtype of the virus, because highly stimulatory HA-subtypes were highly "tolerogenic" whereas low stimulatory subtypes were only marginally effective. Collectively, these observations raise the hypothesis that influenza viruses can cause polyclonal proliferation/differentiation of mature B cells and inactivation/tolerance induction in immature B cells by a mechanism that seems to mimic certain aspects of the physiologic BCR complex-mediated B cell activation.


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