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  • Title: Decline in native kidney function in liver transplant recipients is not associated with BK virus infection.
    Author: Salama M, Boudville N, Speers D, Jeffrey GP, Ferrari P.
    Journal: Liver Transpl; 2008 Dec; 14(12):1787-92. PubMed ID: 19025923.
    Abstract:
    BK virus (BKV) infection is an established cause of allograft dysfunction in renal transplant recipients. The relationship between BKV infection and chronic kidney disease (CKD) post-orthotopic liver transplantation (OLT) is not well understood. This study aimed to determine the prevalence of BKV infection, its relationship to CKD and renal function loss over time in patients receiving OLT. Prevalence of BK viruria and viremia were studied in 41 post-OLT patients after a mean 6.5 +/- 4.7 years posttransplantation. Renal function was assessed using estimated glomerular filtration rate (eGFR) calculated from the yearly serum creatinine levels using the Modification of Diet in Renal Disease (MDRD) formula. Polymerase chain reaction (PCR) was performed for detection of BKV DNA in urine and plasma. BK viruria was present in 24.2% of patients, but none of these OLT recipients had detectable BK viremia. Decoy cells in the urine were found in 9.7% patients, although none of these patients had BK viruria. CKD, defined as eGFR <60 mL/minute/1.73 m(2), was found in 83% of OLT recipients. The yearly decline in eGFR was -6.9 +/- 17 and -9.2 +/- 18 mL/minute/year in BK viruria-positive and BK viruria-negative patients, respectively (P = 0.39). There was no relationship between the presence or absence of BK viruria and either current eGFR, yearly decline in eGFR, number and type of immunosuppressive agents, or etiology of liver failure. In OLT recipients, BK viruria is not associated with BK viremia or native kidney dysfunction. It appears that the most probable pathway for the development of BKV nephropathy requires a second hit, such as kidney inflammation, kidney ischemia, or donor-recipient human leukocyte antigen mismatch.
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