Polyomavirus nephropathy (PVN) is a form of nephritis caused by reactivation of the human polyomavirus, BKV, in renal transplant patients. BKV is ubiquitous in most human populations and establishes a lifelong, subclinical, persistent infection of the kidney. In transplant patients and other immunocompromised individuals, viral replication leads to tissue damage and renal dysfunction. The incidence of PVN has risen dramatically in recent years concomitant with rising numbers of transplants being performed and the development of more effective immunosuppressive drug regimens aimed towards preventing rejection of the transplant. Presently, there are no effective anti-viral treatments for BKV, and therefore the clinician is faced with the dilemma of reducing the dose of immunosuppressive drugs to allow the patient's immune system to battle the virus, which then raises the risk of graft rejection. The biology of BKV in human renal epithelial cells is beginning to be uncovered, and a better understanding will be critical in the design of therapeutic approaches. Using an in vitro cell culture system for the propagation of primary human renal proximal tubule epithelial cells that allows them to maintain their differentiated function, key features of the BKV life cycle can be studied. BKV replicates efficiently in these cells. Treatment of the cells with interferon-?, however, inhibits viral gene expression and, therefore, replication.
The aims of this project are to utilize this in vitro system to characterize the mechanisms that regulate viral replication, including an analysis of viral chromatin and subnuclear localization of the viral genome under replicating and non- replicating conditions. In addition, the pathway that the viral particle takes from the plasma membrane to the nucleus of the cell, during which it begins to disassemble, will be examined. The long term goals of these studies are to dissect the mechanisms that regulate BKV replication in renal tubular epithelial cells and to identify steps in the viral life cycle that may be amenable to the development of new antiviral drugs.

Public Health Relevance

BK virus is a virus that infects nearly everyone during early childhood but does not cause any disease in healthy individuals. However, in kidney transplant recipients the virus can reactivate from an otherwise dormant state and cause a destructive disease of the kidney. Up to ten percent of loss of function of transplanted kidneys is thought to be due to BK virus and there are no drugs available with which to treat the infection. BKV can also cause severe bladder disease in bone marrow transplant patients. Therefore, it is the goal of this project to understand more about how the virus infects cells in the kidney and urinary tract, which should lead to the identification of new targets for anti-viral drugs.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
Project #
Application #
Study Section
Virology - B Study Section (VIRB)
Program Officer
Park, Eun-Chung
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
University of Michigan Ann Arbor
Schools of Medicine
Ann Arbor
United States
Zip Code
Imperiale, Michael J (2014) Polyomavirus miRNAs: the beginning. Curr Opin Virol 7:29-32
Broekema, Nicole M; Imperiale, Michael J (2013) miRNA regulation of BK polyomavirus replication during early infection. Proc Natl Acad Sci U S A 110:8200-5
Bennett, Shauna M; Jiang, Mengxi; Imperiale, Michael J (2013) Role of cell-type-specific endoplasmic reticulum-associated degradation in polyomavirus trafficking. J Virol 87:8843-52
Broekema, Nicole M; Imperiale, Michael J (2012) Efficient propagation of archetype BK and JC polyomaviruses. Virology 422:235-41
Bennett, Shauna M; Broekema, Nicole M; Imperiale, Michael J (2012) BK polyomavirus: emerging pathogen. Microbes Infect 14:672-83
Jiang, Mengxi; Entezami, Pouya; Gamez, Monica et al. (2011) Functional reorganization of promyelocytic leukemia nuclear bodies during BK virus infection. MBio 2:e00281-10
Swimm, Alyson I; Bornmann, William; Jiang, Mengxi et al. (2010) Abl family tyrosine kinases regulate sialylated ganglioside receptors for polyomavirus. J Virol 84:4243-51
Broekema, Nicole M; Abend, Johanna R; Bennett, Shauna M et al. (2010) A system for the analysis of BKV non-coding control regions: application to clinical isolates from an HIV/AIDS patient. Virology 407:368-73
Abend, Johanna R; Low, Jonathan A; Imperiale, Michael J (2010) Global effects of BKV infection on gene expression in human primary kidney epithelial cells. Virology 397:73-9
Jiang, Mengxi; Abend, Johanna R; Johnson, Silas F et al. (2009) The role of polyomaviruses in human disease. Virology 384:266-73

Showing the most recent 10 out of 19 publications