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The Journal of Immunology, Vol 138, Issue 5 1397-1402, Copyright © 1987 by American Association of Immunologists

ARTICLES

The localization of the antibody response in milk or bile depends on the nature of the antigen

UI Dahlgren, S Ahlstedt and LA Hanson

Immunization in the Peyer's patches of rats with horse spleen ferritin or Escherichia coli 06 carrying type 1 pili resulted in an IgA antibody response detected in milk and bile and an IgG and IgM antibody response in serum, milk, and bile. The IgA antibody response to type 1 pili was as a mean 5.0-fold higher in milk than in bile. In contrast IgA antibody activity to 06 LPS was as a mean 6.3-fold higher in bile than in milk. The IgA antibodies to ferritin were randomly distributed between milk and bile. The IgG and IgM antibody activity to all three antigens studied were higher in the milk than in the bile. The secretory antibody response could be transferred from immunized rats to unimmunized rats with mesenteric lymph node cells (MLN) taken from donor rats 4 days after immunization in the Peyer's patches. IgA antibodies to pili and ferritin appeared solely in the milk of the recipients, whereas IgA antibodies to the 06 LPS only appeared in the bile. The ratios serum:milk and serum:bile for the IgG and IgM antibodies indicated an antigen-specific direction of homing with local production of these two isotypes primarily in the mammary gland. Antibody-forming cells of the IgA class could not be detected in the MLN on the day the cells were transferred. It is concluded that the difference seen in antibody distribution between milk and bile is not due to dissemination of antigen, but instead a result of different homing or expansion at the mucosal-glandular site dependent on the antigen specificity of the migrating cells.


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S. Sabbaj, M. K. Ghosh, B. H. Edwards, R. Leeth, W. D. Decker, P. A. Goepfert, and G. M. Aldrovandi
Breast Milk-Derived Antigen-Specific CD8+ T Cells: An Extralymphoid Effector Memory Cell Population in Humans
J. Immunol., March 1, 2005; 174(5): 2951 - 2956.
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