[BK Virus Nephropathy After Kidney Transplantation]

Overview

Journal Pathologe

Specialty Pathology

Date 2011 Jul 9

PMID 21739198

Authors

V Brocker

A Schwarz

J U Becker

Affiliations

Soon will be listed here.

Abstract

JC and BK viruses are strains of the polyomavirus group with pathogenic potential in humans. BK is the most frequent pathogenic agent of polyomavirus nephropathy (BKVN) in kidney transplant patients, which is only exceptionally caused by JC virus. Asymptomatic BK virus infection is often acquired in childhood and the virus persists in urothelium and kidneys of healthy individuals, where it can be reactivated under immunosuppression. Up to 10% of transplanted kidneys are affected by BKVN, while the risk of transplant failure due to BKVN exceeds 50% in some publications. In kidney biopsies BKVN leads to tubulointerstitial nephritis, which may be difficult to distinguish from acute cellular rejection without additional use of immunohistochemistry for a polyomavirus antigen. Typical hallmarks of BKVN include cytopathic effects caused by the virus with cell lysis, denudation of tubular basement membranes and nuclear inclusion bodies. An early diagnosis is essential for transplant survival, making screening of blood and urine for BK virus after kidney transplantation part of the standard care of renal transplant patients today. In the case of significant viremia or biopsy-proven BKVN immunosuppression is reduced to allow clearing of the virus.

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