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Increasing urinary IL-6 levels announce kidney graft rejection
1Friedrichshain Hospital, Department of Laboratory Medicine, Berlin, Germany.
Summary
Urinary IL-6 (interleukin-6) is a valuable non-invasive marker for detecting kidney transplant rejection and inflammation. Monitoring uIL-6 levels helps assess graft health and guides treatment decisions effectively.
Area of Science:
- Nephrology
- Transplantation Immunology
- Biomarker Discovery
Background:
- Acute rejection (AR) involves an inflammatory response to a transplanted organ.
- Elevated interleukin-6 (IL-6) producing cells within the graft suggest local inflammation.
- Urinary IL-6 (uIL-6) is a potential non-invasive indicator of intragraft inflammatory status.
Purpose of the Study:
- To establish the diagnostic relevance and dynamics of urinary IL-6 (uIL-6) levels in kidney transplant recipients.
- To correlate uIL-6 levels with post-transplant complications such as delayed graft function and acute rejection.
- To compare the diagnostic utility of uIL-6 with serum IL-6 in AR.
Main Methods:
- Daily measurement of uIL-6 levels using Quantikine IL-6 immunoassay in 101 kidney graft recipients.
- Collection of 1915 urine samples during the post-transplant hospital stay.
- Analysis of uIL-6 levels in relation to clinical outcomes: uncomplicated course, delayed graft function, steroid-sensitive and resistant AR, urinary tract infections, and cytomegalovirus disease.
Main Results:
- Uncomplicated cases showed mean uIL-6 levels between 4-8 pg/ml after an initial peak.
- Delayed graft function was associated with very high uIL-6 (> 200 pg/ml).
- Steroid-sensitive AR showed significantly increasing uIL-6 levels prior to treatment (23 to 82 pg/ml), while steroid-resistant AR showed persistent high levels (mean peak 99 pg/ml).
- uIL-6 demonstrated greater diagnostic relevance for AR than serum IL-6.
- Increased uIL-6 levels were observed in bacterial UTIs (peak 53 pg/ml) and mild CMV disease (peak 26 pg/ml), normalizing after successful treatment.
Conclusions:
- Urinary IL-6 (uIL-6) is a simple, non-invasive, and informative marker of intragraft inflammation in kidney transplant recipients.
- uIL-6 levels effectively differentiate between uncomplicated recovery, delayed graft function, and acute rejection.
- Monitoring uIL-6 is recommended for assessing kidney graft status and guiding therapeutic interventions.