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In contrast to intact BALB/c mice, BALB/c mice rendered deficient in Vbeta4+ CD4+ T cells develop a Th1 response to infection with Leishmania major and are resistant. Vbeta4-deficient BALB/c mice are unable to generate the early IL-4 transcription occurring in Vbeta4 Valpha8 CD4+ T cells of BALB/c mice within 1 day of infection. Here we demonstrate that treatment of Vbeta4-deficient BALB/c mice with IL-4 during the first 64 h after infection instructs Th2 cell development and susceptibility to infection. The demonstrated inability of IL-4 to reverse the resistant phenotype of BALB/c mice treated with anti-CD4 mAb the day before infection suggest that these effects of IL-4 require its interaction with CD4+ T cells. In contrast to draining lymph node cells from BALB/c mice, cells from Vbeta4-deficient BALB/c mice remain responsive to IL-12 following infection. Strikingly, administration of IL-4 to Vbeta4-deficient BALB/c mice renders their lymph node cells unresponsive to IL-12 by down-regulating IL-12R beta2-chain expression. This study directly demonstrates that in BALB/c mice IL-4 is necessary and sufficient to initiate the molecular events steering Th2 cell maturation and susceptibility to L. major.

the journal of immunology/the journal of immunology

In BALB/c Mice, IL-4 Production During the Initial Phase of Infection with<i>Leishmania major</i>Is Necessary and Sufficient to Instruct Th2 Cell Development Resulting in Progressive Disease

In BALB/c Mice, IL-4 Production During the Initial Phase of Infection withLeishmania majorIs Necessary and Sufficient to Instruct Th2 Cell Development Resulting in Progressive Disease