Regulatory T cells (Tregs) can suppress immunologic damage in renal ischemiareperfusion injury (IRI), but the isolation and ex vivo expansion of these cells for clinical application remains challenging. Here, we investigated whether the IL-2/anti-IL-2...
Regulatory T cells (Tregs) can suppress immunologic damage in renal ischemiareperfusion injury (IRI), but the isolation and ex vivo expansion of these cells for clinical application remains challenging. Here, we investigated whether the IL-2/anti-IL-2 complex (IL-2C), a mediator of Treg expansion, can attenuate renal IRI in mice. IL-2C administered before bilateral renal IRI induced Treg expansion in both spleen and kidney, improved renal function, and attenuated histologic renal injury and apoptosis after IRI. Furthermore, IL-2C administration reduced the expression of inflammatory cytokines and attenuated the infiltration of neutrophils and macrophages in renal tissue. Depletion of Tregs with anti-CD25 antibodies abrogated the beneficial effects of IL-2C. However, IL-2C.mediated renal protection was not dependent on either IL-10or TGF-b.Notably, IL-2Cadministered after IRI also enhanced Treg expansion in spleen and kidney, increased tubular cell proliferation, improved renal function, and reduced renal fibrosis. In conclusion, these results indicate that IL-2C induced Tregexpansion attenuates acute renal damage and improves renal recovery in vivo, suggesting that IL-2C may be a therapeutic strategy for renal IRI. Immunostimulatory IL-2 complex (S4B6) suppressed growth of RENCA celline by increasing NK cells and memory-like CD8+ T cells. Immunostimulatory IL-2 complex decreased size and weight of subcutaneous mass of RENCA cellline in BALB/c mice. Immunostimulatory IL-2 complex increased number of NK cells and CD44+CD8+ T cells in either spleen or tumor tissue. Immunostimulatory IL-2 complex increased expression of IL-2 in spleen, but it did not influenced levels of IL-2 or IL-10 in serum. Immunostimulatory IL-2 complex increased lung weight slightly compared to PBS control, but histology did not show increased pulmonary edema in IL-2 complex group. Immunostimulatory IL-2 complex increased more NK cells and CD8+ T cells than high dose of IL-2 (200,000 IU).