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Transcriptional repressor B-cell lymphoma 6 (Bcl6) appears to regulate T H 2 immune responses in allergies, but its precise role is unclear. We previously reported that Bcl6 suppressed IL-4 production in naïve CD4 +  T cell-derived memory T H 2 cells. To investigate Bcl6 function in allergic responses in naturally occurring memory phenotype CD4 +  T (MPT) cells and their derived T H 2 (MPT H 2) cells,  Bcl6 -manipulated  mice , highly conserved intron enhancer (hcIE)-deficient  mice , and reporter mice for conserved noncoding sequence 2 (CNS2) 3′ distal enhancer region were used to elucidate Bcl6 function in MPT cells. The molecular mechanisms of Bcl6-mediated T H 2 cytokine gene regulation were elucidated using cellular and molecular approaches. Bcl6 function in MPT cells was determined using adoptive transfer to naïve mice, which were assessed for allergic airway inflammation. Bcl6 suppressed IL-4 production in MPT and MPT H 2 cells by suppressing CNS2 enhancer activity. Bcl6 downregulated  Il4  expression in MPT H 2 cells, but not MPT cells, by suppressing hcIE activity. The inhibitory functions of Bcl6 in MPT and MPT H 2 cells attenuated allergic responses. Bcl6 is a critical regulator of IL-4 production by MPT and MPT H 2 cells in T H 2 immune responses related to the pathogenesis of allergies.

Allergic TH2 Response Governed by B-Cell Lymphoma 6 Function in Naturally Occurring Memory Phenotype CD4+ T Cells