AI Article Synopsis
- HCMV encodes proteins to evade the immune response, enabling its replication; understanding these mechanisms is crucial for developing strategies to inhibit the virus.
- CD8 T cells are key players in fighting viral infections, but how HCMV evades their attacks, particularly through the vCXCL1 protein, is not fully understood.
- vCXCL1 increases PD-L1 expression in hepatic cells, enhancing their resistance to CD8 T cells; inhibiting PD-L1 can reduce this resistance, suggesting a potential new avenue for targeting HCMV's immune evasion tactics.
Article Abstract
The HCMV (human cytomegalovirus) encodes numerous proteins which function to evade the immune response, which allows the virus to replicate. Exploring the mechanisms of HCMV immune escape helps to find the strategy to inhibit HCMV replicate. CD8 T cells play a critical role in the immune response to viral pathogens. However, the mechanisms of HCMV to evade the attack by CD8 T cells remain largely unknown. Viral CXCL1 (vCXCL1) is the production of HCMV UL146 gene. Here, we found that vCXCL1 promoted the resistance of hepatic cells to CD8 T cells. vCXCL1 increased the levels of PD-L1 protein expression and mRNA expression. VCXCL1 enhanced the binding of STAT3 transcription factor to the promoter of PD-L1 and increased the activity of PD-L1 promoter. Furthermore, down-regulation of PD-L1 reduced the effects of vCXCL1 on the resistance of hepatic cells to CD8 T cells. Taken together, vCXCL1 promotes the resistance of hepatic cells to CD8 T cells through up-regulation of PD-L1. This finding might provide a new mechanism of HCMV immune escape.
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| http://dx.doi.org/10.1016/j.bbrc.2020.08.060 | DOI Listing |
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