MHC class I-dependent Vγ4+ pulmonary T cells regulate αβ T cell-independent airway responsiveness

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 99; no. 13; pp. 8850 - 8855
• Main Authors: Lahn, Michael, Kanehiro, Arihiko, Takeda, Katsuyuki, Terry, Jennifer, Hahn, Youn-Soo, Aydintug, M. Kemal, Konowal, Anatole, Ikuta, Koichi, O'Brien, Rebecca L., Gelfand, Erwin W., Born, Willi K.
• Format: Journal Article
• Language: English
• Published: National Acad Sciences 25.06.2002; National Academy of Sciences
• Subjects: Biological Sciences
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.132519299

Mice exposed to aerosolized ovalbumin (OVA) develop increased airway responsiveness when deficient in γδ T cells. This finding suggests that γδ T cells function as negative regulators. The regulatory influence of γδ T cells is evident after OVA-sensitization and -challenge, and after OVA-challenge alone, but not in untreated mice. With aerosolized Abs to target pulmonary T cells, we now demonstrate that negative regulation of airway responsiveness is mediated by a small subpopulation of pulmonary γδ T cells. These cells express Vγ4 and depend in their function on the presence of IFN-γ and MHC class I. Moreover, their effect can be demonstrated in the absence of αβ T cells. This novel type of negative regulation seems to precede the development of the adaptive, antigen-specific allergic response.