Complement receptors CD21/35 link innate and protective immunity during Streptococcus pneumoniae infection by regulating IgG3 antibody responses

Karen M. Haas, Minoru Hasegawa, Douglas A. Steeber, Jonathan C. Poe, Mark D. Zabel, Cheryl B. Bock, David R. Karp, David E. Briles, John H. Weis, Thomas F. Tedder

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The CD21/35 receptor provides an important link between innate and adaptive immunity. Its importance during protective immune responses to encapsulated extracellular bacteria was assessed using a new line of mice completely deficient in CD21/35 expression (CD21/35-/-). CD21/35 expression was essential for the rapid trapping of C3dg-antigen complexes by B cells in vivo, especially in splenic marginal zones. Despite normal B cell development in CD21/35-/- mice, T cell-independent and -dependent antibody responses to low-dose antigens were significantly decreased, with a striking impairment in IgG3 responses. Accordingly, CD21/35-/- mice were more susceptible to acute lethal Streptococcus pneumoniae infection. Thus, CD21/35 expression is critical for early protective antibody responses to lethal pathogens that rapidly multiply and quickly overwhelm the immune system.

Original languageEnglish (US)
Pages (from-to)713-723
Number of pages11
JournalImmunity
Volume17
Issue number6
DOIs
StatePublished - Dec 1 2002

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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