Introduction: Early diagnosis of rejection in kidney transplant (KTx) recipients is of paramount importance for long-term graft survival. Cytokines play an important role in rejection via activating T cells. Neutrophil accumulation in the graft indicates cell-mediated rejection. Cellular infiltration is mediated through chemoattractant factors. The aim of this study was to investigate the relationship between graft function and serum levels of interleukin 2 (IL-2) and interleukin 8 (IL-8) in KTx.
Method: Sixty-five patients undergoing KTx were enrolled in the study. Serum samples of IL-2 and IL-8 were collected the day before the operation, on postoperative days 1 and 7 day, and during the first and third month after the onset of rejection. The enzyme-linked immunosorbent assay method was used to determine the IL-2 and IL-8 values.
Results: A total of 9 (13.8%) patients had rejection documented on biopsy samples. Fifty-six patients had stable graft function (SGF). IL-2 and IL-8 values before KTx of both the rejected and SGF patients were not statistically different. Univariate analysis revealed that IL-2 and IL-8 were correlated with rejection (P = .046, P = .015). IL-8 levels were higher in the rejection group compared to the SGF group on the seventh day and first month postoperatively (P = .023, P = .038). The rejection group maintained higher levels of IL-8 for 11 days (range: 7-30) compared to the SGF group (P = .002) and the IL-8 levels correlated with serum creatinine levels (r = 0.621, P = .001). IL-2 levels were higher in the rejection group on days 1 and 7 compared to the SGF group (P = .042, P = .031). IL-2 and IL-8 levels were correlated with low eGFR in the third month in the rejection group (r = 0.421, P = .037; r = 0.518, P = .008).
Conclusion: Determining the cytokine levels in the early post-KTx period may be helpful in tailoring immunosuppressive regimens in patients with a risk of rejection.
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