How Human Cytomegalovirus UL18 Evades Immune Responses
Author Information
Author(s): Kim Youngkyun Park, Boyoun Cho, Sunglim Shin, Jinwook Cho, Kwangmin Jun, Youngsoo Ahn, Kwangseog Ahn
Primary Institution: National Creative Research Initiatives Center for Antigen Presentation, Department of Biological Sciences, Seoul National University, Seoul, Korea
Hypothesis
How does UL18 avoid self-attack by the TAP inhibitor US6?
Conclusion
UL18 helps human cytomegalovirus evade immune responses by restoring TAP function while down-regulating MHC class I surface expression.
Supporting Evidence
- UL18 restores TAP function by counteracting the inhibitory effect of US6.
- Surface expression of MHC class I molecules remains down-regulated despite recovery of TAP function.
- UL18 inhibits optimal peptide loading onto MHC class I molecules.
Takeaway
The virus has a special protein called UL18 that helps it hide from the body's defenses, even though it also makes it harder for the body to recognize infected cells.
Methodology
The study involved infecting HeLa cells with recombinant viruses and analyzing surface expression of MHC class I and UL18 using flow cytometry.
Limitations
The study does not address the long-term effects of UL18 on immune evasion or the full range of immune responses.
Digital Object Identifier (DOI)
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