E3 PreliminaryPreliminaryPEM unclearMechanisticPeer-reviewedMachine draft
XMRV: usage of receptors and potential co-receptors.
Setty, Mohan Kumar Haleyur Giri, Devadas, Krishnakumar, Ragupathy, Viswanath et al. · Virology journal · 2011 · DOI
Quick Summary
Scientists studied how a virus called XMRV enters and infects human cells, particularly immune cells. They found that while this virus is known to use one main doorway (called XPR1) to get into cells, it can also use other doorways, including ones normally used by immune system molecules called chemokine receptors. This suggests the virus may be more flexible at infecting different types of cells than previously thought.
Why It Matters
Understanding how XMRV enters different immune cells is crucial for ME/CFS research because it may explain how the virus persists in patients and causes widespread immune dysfunction. If XMRV can use multiple cellular doorways, this has implications for viral pathogenesis and potential treatment strategies targeting viral entry.
Observed Findings
- XMRV replicated in A549 cells that lack XPR1 expression, suggesting use of alternative receptors
- XMRV replication varied significantly across different cell lines (LNCaP, DU145, A549, Caski), with differential replication rates
- GHOST cells expressing CD4 with chemokine receptors CCR1–CCR8 and BOB supported XMRV replication
- Significant XMRV replication occurred in CCR3 and BOB-expressing GHOST cells, though at lower levels than in traditional cell lines
Inferred Conclusions
- XMRV can utilize chemokine receptors (CCR3, BOB) as alternative or co-receptors for cell entry beyond the canonical XPR1 pathway
- XMRV tropism in hematopoietic cells may be mediated by CD4 and various chemokine receptors, explaining infection of immune cells in CFS patients
- The virus's ability to use multiple receptor pathways may contribute to its capacity for persistent infection across diverse cell types
Remaining Questions
- What is the precise molecular mechanism by which XMRV enters cells via alternative receptors, and are these true entry receptors or only facilitating factors?
- Do chemokine receptor-mediated infections occur in primary patient lymphocytes, and what is their relative frequency compared to XPR1-mediated infection?
What This Study Does Not Prove
This study does not definitively prove that alternative receptors are the primary entry mechanism—only that XMRV can replicate in cells expressing them. It does not establish a causal link between XMRV infection patterns and ME/CFS symptoms, nor does it confirm XMRV's role in ME/CFS disease pathogenesis. The in vitro findings may not accurately reflect infection dynamics in living patients.
Tags
Biomarker:Gene Expression
Method Flag:No ControlsExploratory Only
Metadata
- DOI
- 10.1186/1743-422X-8-423
- PMID
- 21896167
- Review status
- Machine draft
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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