The Journal of Experimental Medicine
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Published online 17 July 2000.
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© The Rockefeller University Press, 0022-1007/2000/7/271/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 2, July 17, 2000 271-280


Original Article

B-1 and B-2 Cell–derived Immunoglobulin M Antibodies Are Nonredundant Components of the Protective Response to Influenza Virus Infection

Nicole Baumgartha, Ometa C. Hermana, Gina C. Jagera, Lorena E. Brownb, Leonore A. Herzenberga, and Jianzhu Chenc
a Department of Genetics, Stanford University School of Medicine, Stanford, California 94305
b Department of Microbiology, University of Melbourne, Victoria 3056, Australia
c Center for Cancer Research and Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Correspondence to: Nicole Baumgarth, Center for Comparative Medicine, University of California, Davis, CA 95616. Tel:530-754-5813 Fax:530-752-7914 E-mail:nbaumgarth{at}ucdavis.edu.

We have studied the role of secreted immunoglobulin (Ig)M in protection from infection with influenza virus and delineated the relative contributions of B-1 versus B-2 cell–derived IgM in this process. Mice deficient in secreted IgM but capable of expressing surface IgM and secreting other Ig classes show significantly reduced virus clearance and survival rates compared with wild-type controls. Irradiation chimeras in which only either B-1 or B-2 cells lack the ability to secrete IgM show mortality rates similar to those of mice in which neither B-1 nor B-2 cells secrete IgM. Dependence on both sources of IgM for survival is partially explained by findings in allotype chimeras that broadly cross-reactive B-1 cell–derived natural IgM is present before infection, whereas virus strain–specific, B-2 cell–derived IgM appears only after infection. Furthermore, lack of IgM secreted from one or both sources significantly impairs the antiviral IgG response. Reconstitution of chimeras lacking B-1 cell–derived IgM only with IgM-containing serum from noninfected mice improved both survival rates and serum levels of virus-specific IgG. Thus, virus-induced IgM must be secreted in the presence of natural IgM for efficient induction of specific IgG and for immune protection, identifying B-1 and B-2 cell–derived IgM antibodies as nonredundant components of the antiviral response.

Key Words: B cells, immunoglobulin M, immune protection, CD5+ B cell, respiratory tract


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