Since antibiotic-induced S. pneumoniae fragments activated host cells via TLR2 [ 29], it is unlikely that in TLR2-/ mice TNF484 treatment reduced the inflammation, which was induced by the cell wall components released during ceftriaxone therapy [ 27].
However, first, it should be noted that the breast carcinoma (and lymphoma) were grown ectopically (subcutaneously) and in all cases therapy was commenced on day 0, maximising the opportunity for the administered antibody (or activated host cells) to exert therapeutic effects.
Notably, the most significant GO terms included 'oxidation-reduction process' (GO 0055114) and molecular function 'oxidoreductase activity' (GO 0016616) consistent with background knowledge on the roles of human gut microbiota in activating host cell signaling through the production of reactive oxygen species in intestinal epithelial cells43.
PFTs may activate host cell signaling pathways via pore-dependent or -independent mechanisms.
Secreted cruzipain cleaves host kininogen to liberate bradykinin, and the triggering of the host bradykinin receptor activates host cell PLC, contributing to Ca2+ release [ 81, 84].
In addition, cell-type-specific promoters are advantageous since they are less likely to activate host cell defense machinery and are less sensitive to cytokine-induced promoter inactivation than viral promoters [ 6].
It remains a theoretical possibility, however, that a Plasmodium infection activates host cell PI-kinases in the red blood cell cytoplasm resulting in elevated PIP2 levels that would be inaccessible to the parasite's PI-PLC enzyme.
It was shown that the protist induces apoptosis of the epithelial cells by activating host cell caspases 3 and 9 but not 8. K. D. Cruz et al. present experimental evidence that lipid rafts from host cells (macrophages and epithelial cells) play some role in the process of host cell invasion by the pathogenic protozoan Toxoplasma gondii.
When activated, C5 is involved in activating host cells, thereby attracting pro-inflammatory immune cells, while also destroying cells by triggering pore formation [2].
Members of this community can activate host cells, and the biofilm itself creates a habitat for additional species, some of which are closely associated with the initiation and progression of dental caries and periodontal disease [ 2].
