Pattern recognition receptors sensing Ad26 vector components (Ad26 PRRs)

Pattern recognition receptors (PRRs) sensing Ad26 vector components represent the host's innate immune machinery responsible for detecting Adenovirus serotype 26 (Ad26) vaccine vectors. This collective target includes endosomal sensors like Toll-like receptor 9 (TLR9), which detects viral DNA, and cytosolic sensors such as cyclic GMP-AMP synthase (cGAS) and the Stimulator of Interferon Genes (STING) (Lam et al., 2014). Additionally, surface receptors like TLR2 may recognize viral capsid proteins, while the NLRP3 inflammasome can be activated by the internalizing vector. The primary biological function of these PRRs is to initiate the innate immune response, characterized by the secretion of Type I interferons and pro-inflammatory cytokines like IL-6 and TNF-alpha. This early activation is crucial for the subsequent development of protective T-cell and B-cell mediated immunity (Teijaro & Farber, 2021). However, the intensity of this sensing must be carefully balanced, as excessive activation is linked to systemic side effects and rare but serious complications like thrombosis with thrombocytopenia syndrome (TTS) (Greinacher et al., 2021). Consequently, these PRRs are key focal points for biotech analysts evaluating the immunogenicity and safety profiles of Ad26-based vaccine platforms.

Other names

Ad26 innate sensorsAdenovirus 26 pattern recognition receptorsInnate immune sensors of Ad26Ad26-sensing PRRs

Activation of multiple innate immune sensing pathways including TLR9, cGAS-STING, and TLR2 to induce Type I interferons and pro-inflammatory cytokines.