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4+ 
T Cells Regulate Airway Hyperreactivity to Methacholine in Ovalbumin-Sensitized and Challenged Mice 1





* Department of Immunology,
Division of Cell Biology, Department of Pediatrics at National Jewish Medical and Research Center, Denver, CO 80206; and
Department of Pediatrics, Chungbuk National University and College of Medicine, Cheongju, Korea
The V
4+ pulmonary subset of 
T cells regulates innate airway responsiveness in the absence of 
T cells. We now have examined the same subset in a model of allergic airway disease, OVA-sensitized and challenged mice that exhibit Th2 responses, pulmonary inflammation, and airway hyperreactivity (AHR). In sensitized mice, V
4+ cells preferentially increased in number following airway challenge. Depletion of V
4+ cells before the challenge substantially increased AHR in these mice, but had no effect on airway responsiveness in normal, nonchallenged mice. Depletion of V
1+ cells had no effect on AHR, and depletion of all TCR-
+ cells was no more effective than depletion of V
4+ cells alone. Adoptively transferred pulmonary lymphocytes containing V
4+ cells inhibited AHR, but lost this ability when V
4+ cells were depleted, indicating that these cells actively suppress AHR. Eosinophilic infiltration of the lung and airways, or goblet cell hyperplasia, was not affected by depletion of V
4+ cells, although cytokine-producing 
T cells in the lung increased. These findings establish V
4+ 
T cells as negative regulators of AHR and show that their regulatory effect bypasses much of the allergic inflammatory response coincident with AHR.
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