Given that TRAIL preferentially kills HIV-1-infected macrophages, it is plausible that the initial increase in TRAIL is part of the innate immune response directed toward the elimination of HIV-1-infected cells.
"There's been a tenfold increase in trail events, and the events have seen a massive rise in participation because it's such a natural way to engage with the environment".
The decision was also opposed by nearby homeowners who believed an increase in trail use would threaten their privacy.
Therefore, JNK II kinase is required for the HIV gp120 mediated increase in TRAIL R2 levels in Huh7 cells, as well as the conferred TRAIL sensitivity.
In contrast, IFNs, including IFN-α, IFN-β, and IFN-γ, caused a significant increase in TRAIL protein and mRNA levels (Fig. 5A C).
To address whether TRAIL mRNA induction paralleled the increase in TRAIL protein, RT-PCR (Figure 3B) and real time PCR (Figure 3C) were performed with total RNA extracted from transfected HT29 cells; TRAIL mRNA induction was noted with NFATc1 overexpression.
To further elucidate whether increased levels of IRFs mediate the increase in TRAIL transcription, we transfected IRF-1, IRF-3 or IRF-7 siRNA, and a nonspecific siRNA as a control in MDM cultures.
To test whether type I IFNs were responsible for STAT1 activation and the subsequent increase in TRAIL levels after HIV-1-infection of MDM, type I IFN-neutralizing antibodies were administered.
HIV-1-infected MDM culture showed a dramatic increase in TRAIL staining (Fig. 2E, H), particularly those MDM that were adjacent to p24-positive multinucleated giant cells expressed high levels of TRAIL surface staining (Fig. 2E, F, H).
Given that HIV gp120 induced TRAIL sensitivity can be abrogated by pre-incubating hepatocytes with JNK II kinase inhibitors, we questioned whether the concomitant increase in TRAIL R2 expression on hepatocytes is also mediated by the JNK II kinase.
