| First Author | Guereschi MG | Year | 2013 |
| Journal | Eur J Immunol | Volume | 43 |
| Issue | 4 | Pages | 1001-12 |
| PubMed ID | 23436577 | Mgi Jnum | J:195045 |
| Mgi Id | MGI:5476365 | Doi | 10.1002/eji.201243005 |
| Citation | Guereschi MG, et al. (2013) Beta2-adrenergic receptor signaling in CD4(+) Foxp3(+) regulatory T cells enhances their suppressive function in a PKA-dependent manner. Eur J Immunol 43(4):1001-12 |
| abstractText | Beta2-adrenergic receptor (B2AR) signaling is known to impair Th1-cell differentiation and function in a cAMP-dependent way, leading to inhibition of cell proliferation and decreased production of IL-2 and IFN-gamma. CD4(+) Foxp3(+) Treg cells play a key role in the regulation of immune responses and are essential for maintenance of self-tolerance. Nevertheless, very little is known about adrenergic receptor expression in Treg cells or the influence of noradrenaline on their function. Here we show that Foxp3(+) Treg cells express functional B2AR. B2AR activation in Treg cells leads to increased intracellular cAMP levels and to protein kinase A (PKA)-dependent CREB phosphorylation. We also found that signaling via B2AR enhances the in vitro suppressive activity of Treg cells. B2AR-mediated increase in Treg-cell suppressive function was associated with decreased IL-2 mRNA levels in responder CD4(+) T cells and improved Treg-cell-induced conversion of CD4(+) Foxp3(-) cells into Foxp3(+) induced Treg cells. Moreover, B2AR signaling increased CTLA-4 expression in Treg cells in a PKA-dependent way. Finally, we found that PKA inhibition totally prevented the B2AR-mediated increase in Treg-cell suppressive function. Our data suggest that sympathetic fibers are able to regulate Treg-cell suppressive activity in a positive manner through B2AR signaling. |
