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J. Exp. Med.,
Volume 187, Number 8, April 20, 1998 1193-1204
By
§
§
From the * Department of Immunology, University of Birmingham Medical School, Birmingham B15 2TT
United Kingdom; the The respective production of specific immunoglobulin (Ig)G2a or IgG1 within 5 d of primary
immunization with Swiss type mouse mammary tumor virus [MMTV(SW)] or haptenated
protein provides a model for the development of T helper 1 (Th1) and Th2 responses. The antibody-producing cells arise from cognate T cell B cell interaction, revealed by the respective
induction of C The addition of killed Bordetella pertussis to the hapten-protein induces nonhapten-specific
IgG2a and IgG1 plasma cells, whereas the anti-hapten response continues to be IgG1 dominated. This indicates that a Th2 response to hapten-protein can proceed in a node where there
is substantial Th1 activity.
Ludwig Institute for Cancer Research, Lausanne Branch; and the § Institute of
Biochemistry, University of Lausanne, 1066 Epalinges, Switzerland
2a and C
1 switch transcript production, on the third day after immunization. T cell proliferation and upregulation of mRNA for interferon
in response to MMTV(SW)
and interleukin 4 in response to haptenated protein also starts during this day. It follows that
there is minimal delay in these responses between T cell priming and the onset of cognate interaction between T and B cells leading to class switching and exponential growth. The Th1 or
Th2 profile is at least partially established at the time of the first cognate T cell interaction with
B cells in the T zone.
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