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. 2011 Oct;11(10):2228-34.
doi: 10.1111/j.1600-6143.2011.03680.x. Epub 2011 Aug 3.

Urinary chemokines CXCL9 and CXCL10 are noninvasive markers of renal allograft rejection and BK viral infection

J A Jackson  1 , E J Kim, B Begley, J Cheeseman, T Harden, S D Perez, S Thomas, B Warshaw, A D Kirk
Affiliations

Urinary chemokines CXCL9 and CXCL10 are noninvasive markers of renal allograft rejection and BK viral infection

J A Jackson et al. Am J Transplant. 2011 Oct.

Abstract

Renal transplant recipients require periodic surveillance for immune-based complications such as rejection and infection. Noninvasive monitoring methods are preferred, particularly for children, for whom invasive testing is problematic. We performed a cross-sectional analysis of adult and pediatric transplant recipients to determine whether a urine-based chemokine assay could noninvasively identify patients with rejection among other common clinical diagnoses. Urine was collected from 110 adults and 46 children with defined clinical conditions: healthy volunteers, stable renal transplant recipients, and recipients with clinical or subclinical acute rejection (AR) or BK infection (BKI), calcineurin inhibitor (CNI) toxicity or interstitial fibrosis (IFTA). Urine was analyzed using a solid-phase bead-array assay for the interferon gamma-induced chemokines CXCL9 and CXCL10. We found that urine CXCL9 and CXCL10 were markedly elevated in adults and children experiencing either AR or BKI (p = 0.0002), but not in stable allograft recipients or recipients with CNI toxicity or IFTA. The sensitivity and specificity of these chemokine assays exceeded that of serum creatinine. Neither chemokine distinguished between AR and BKI. These data show that urine chemokine monitoring identifies patients with renal allograft inflammation. This assay may be useful for noninvasively distinguishing those allograft recipients requiring more intensive surveillance from those with benign clinical courses.

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Conflict of interest statement

Disclosure

The authors of this manuscript have no conflicts of interest to disclose as described by the American Journal of Transplantation.

Figures

Figure 1
Figure 1
Levels of (a) serum creatinine, (b)urine CXCL9, and (c) urine CXCL10 were ranked and compared by nonparametric analysis across study groups. Figure 1a depicts the elevation of creatinine in both inflammatory and non-inflammatory conditions. In contrast, urine CXCL9 and CXCL10 both were elevated for acute rejection and BK virus infection but not in non-inflammatory conditions.
Figure 1
Figure 1
Levels of (a) serum creatinine, (b)urine CXCL9, and (c) urine CXCL10 were ranked and compared by nonparametric analysis across study groups. Figure 1a depicts the elevation of creatinine in both inflammatory and non-inflammatory conditions. In contrast, urine CXCL9 and CXCL10 both were elevated for acute rejection and BK virus infection but not in non-inflammatory conditions.
Figure 1
Figure 1
Levels of (a) serum creatinine, (b)urine CXCL9, and (c) urine CXCL10 were ranked and compared by nonparametric analysis across study groups. Figure 1a depicts the elevation of creatinine in both inflammatory and non-inflammatory conditions. In contrast, urine CXCL9 and CXCL10 both were elevated for acute rejection and BK virus infection but not in non-inflammatory conditions.
Figure 2
Figure 2
ROC curves for (a) urine CXCL9, (b) urine CXCL10, and (c) serum creatinine in detecting either acute rejection or BK virus infection. Among these tests, CXCL9 had the highest sensitivity and specificity (86% and 80%, respectively) with a c statistic of 0.873.
Figure 2
Figure 2
ROC curves for (a) urine CXCL9, (b) urine CXCL10, and (c) serum creatinine in detecting either acute rejection or BK virus infection. Among these tests, CXCL9 had the highest sensitivity and specificity (86% and 80%, respectively) with a c statistic of 0.873.
Figure 2
Figure 2
ROC curves for (a) urine CXCL9, (b) urine CXCL10, and (c) serum creatinine in detecting either acute rejection or BK virus infection. Among these tests, CXCL9 had the highest sensitivity and specificity (86% and 80%, respectively) with a c statistic of 0.873.
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