TLR4 recognizes bacterial-derived lipopolysaccharides and activates IRF3 via the adapter protein TRIF, contributing to the induction of type I IFN genes. Within endosomes, TLR3, TLR7, and TLR9 ...
In fighting chronic infections or certain cancers, CD8 + T cells—the immune system's frontline soldiers—eventually become exhausted. They lose effectiveness and respond less efficiently to threats.