Tumor necrosis factor-alpha blockade suppresses BK polyomavirus replication

Area of Science:

• Nephrology
• Virology
• Immunology

Background:

• BK polyomavirus (BKPyV) infection is a significant cause of renal inflammation and kidney damage in transplant recipients.
• Tumor necrosis factor-alpha (TNF-α), a key inflammatory cytokine, is elevated during renal inflammation and injury.

Purpose of the Study:

• To investigate the role of TNF-α in BKPyV infection.
• To determine the effect of TNF-α blockade on BKPyV replication.

Main Methods:

• Analysis of urinary TNF-α and its receptors (TNFR1, TNFR2) in kidney transplant recipients with and without BKPyV-associated nephropathy (BKPyVN).
• In vitro studies using BKPyV-infected human proximal tubular cells (HRPTECs) treated with TNF-α, etanercept, or NF-κB inhibitors.
• Assessment of viral gene expression, promoter activity, and replication.

Main Results:

• Elevated urinary TNF-α and its receptors were observed in BKPyVN patients.
• TNF-α stimulation increased BKPyV replication markers in HRPTECs.
• Inhibition of TNFR1, TNFR2, or NF-κB signaling pathways reduced TNF-α-stimulated viral replication.
• Etanercept (TNF-α blockade) suppressed BKPyV replication and inflammatory cytokine production.

Conclusions:

• TNF-α signaling actively stimulates BKPyV replication.
• Inhibiting the TNF-α pathway or its downstream signaling components can attenuate BKPyV replication.
• Targeting TNF-α represents a promising therapeutic strategy for managing BKPyV infections.