Journal
MICROORGANISMS
Volume 9, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/microorganisms9040778
Keywords
HSV; VZV; CMV; EBV; KSHV; PD-1; PD-L1
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology [19K0750]
- Japan Agency for Medical Research and Development (AMED) [JP20wm0325012]
- Takeda Science Foundation
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The immune system's activation and regulated downregulation are crucial for preventing immune disorders. The PD-1/PD-L1 pathway benefits the host but can also be exploited by pathogens to evade immunity. Herpesviruses like HSV, CMV, and EBV have complex relationships with this pathway and understanding them is essential for developing effective preventative and therapeutic methods.
The immune system has evolved as a complex and efficient means of coping with extrinsic materials, such as pathogens and toxins, as well as intrinsic abnormalities, such as cancers. Although rapid and timely activation of the immune system is obviously important, regulated downregulation of the system is almost as significant as activation to prevent runaway immunity, such as allergies and hypercytokinemia. Therefore, the immune checkpoint programmed cell death 1 (PD-1)/programmed cell death ligand 1 (PD-L1) pathway is beneficial for the host. On the other hand, pathogens have evolved to evade host immunity by taking advantage of the PD-1/PD-L1 pathway. This review is focused on human herpesviruses, such as herpes simplex virus (HSV), cytomegalovirus (CMV), and Epstein-Barr virus (EBV), which cause various types of disorders, and their relationships with the PD-1/PD-L1 pathway. Understanding such relationships will be useful for developing preventative and therapeutic methods for disorders caused by herpesviruses.
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