Related Experiment Video
Updated: May 24, 2026
Measurement of BK-polyomavirus Non-Coding Control Region Driven Transcriptional Activity Via Flow Cytometry
Published on: July 13, 2019
Adaptive immunity rather than viral cytopathology mediates polyomavirus-associated nephropathy in mice
1Department of Surgery, Emory Transplant Center, Emory University School of Medicine, Atlanta, GA, USA.
Abstract:
Nephropathy associated with BK polyomavirus causes kidney allograft dysfunction and failure. Understanding the pathogenesis of polyomavirus-associated allograft nephropathy (PVAN) is hampered by the species specificity of Polyomaviridae family members. Using a mouse polyomavirus (MPyV) kidney transplant model, we investigated clinically relevant variables that may contribute to PVAN. We found that the timing and source (i.e. donor vs. recipient) of MPyV infection and the titer of the viral inoculum have significant effects on the extent of allograft injury, with acute infection of the recipient by high-titer MPyV inoculums producing the most profound PVAN. In contrast, altering the degree of MHC matching or increasing ischemia/reperfusion injury by prolonging the cold ischemic time of the allograft did not affect the severity of PVAN. Survival correlated positively with serum creatinine levels, but not with viral loads in the kidney allograft. Using splenectomized alymphoplasia mice, which are unable to mount primary adaptive immune responses, we further demonstrate that persistent high viral loads in the kidney are not sufficient to cause advanced PVAN. These findings suggest that the mechanism of PVAN in mice is not a direct consequence of viral cytopathology, but rather involves interplay between viral infection and the recipient antidonor immune response.
Insights
BK polyomavirus infection timing and viral load significantly impact kidney allograft injury, with recipient infection causing severe damage. The study suggests PVAN involves immune responses, not just viral cytopathology.
Area of Science:
- Nephrology
- Virology
- Immunology
Background:
- BK polyomavirus-associated nephropathy (PVAN) is a major cause of kidney transplant failure.
- Understanding PVAN pathogenesis is limited by the species specificity of polyomaviruses.
Purpose of the Study:
- To investigate clinically relevant factors influencing polyomavirus-associated allograft nephropathy (PVAN) using a mouse model.
- To elucidate the mechanisms underlying PVAN development in kidney allografts.
Main Methods:
- Utilized a mouse polyomavirus (MPyV) kidney transplant model.
- Varied timing and source of MPyV infection, viral inoculum titer, MHC matching, and ischemia/reperfusion injury.
- Employed splenectomized alymphoplasia mice to assess the role of adaptive immunity.
Main Results:
- Acute recipient infection with high-titer MPyV resulted in the most severe PVAN.
- MHC matching and prolonged cold ischemia did not significantly alter PVAN severity.
- Persistent high viral loads alone were insufficient to cause advanced PVAN in immunodeficient mice.
- Survival correlated with serum creatinine, not kidney allograft viral loads.
Conclusions:
- PVAN severity is influenced by MPyV infection dynamics (timing, source, titer) in the recipient.
- The mechanism of PVAN involves an interplay between viral infection and the recipient's immune response against the donor.
- Viral cytopathology alone does not drive advanced PVAN; immune-mediated mechanisms are critical.
Related Concept Videos
01:29Immune Response Against Viral Pathogens
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
01:27Cytomegalovirus Disease