anisomycin and quinotrierixin

Quinotrierixin was isolated from microbes as an inhibitor of ER stress-induced XBP1 mRNA splicing, but its mode of action was unclear. We found that quinotrierixin is an inhibitor of protein synthesis, and that the required dose range of quinotrierixin to inhibit ER stress-induced XBP1 mRNA splicing was similar to that to inhibit protein synthesis. Furthermore, we also found that quinotrierixin inhibited the ER stress-induced increases of unfolded protein response-related genes such as GRP78, CHOP, EDEM, ERdj4, and p58(IPK). Thus, we showed that quinotrierixin inhibited the ER stress-induced unfolded protein response, possibly due to its inhibitory activity of protein synthesis.

Topics: Anisomycin; Cycloheximide; DNA-Binding Proteins; Endoplasmic Reticulum; Endoplasmic Reticulum Chaperone BiP; HeLa Cells; Humans; Protein Biosynthesis; Protein Unfolding; Regulatory Factor X Transcription Factors; Rifabutin; RNA Splicing; RNA, Messenger; Transcription Factors; X-Box Binding Protein 1