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In human colorectal adenocarcinoma cell lines, we found two major transcripts of cyclooxygenase-2, the full-length mRNA and a short polyadenylation variant (2577 kb) lacking the distal segment of the 3'-untranslated region. Tristetraprolin, an mRNA-binding protein that promotes message instability, was shown to bind the cyclooxygenase-2 mRNA in the region of the 3'-untranslated region between nucleotides 3125 and 3432 and to reduce levels of the full-length mRNA. During cell growth and confluence, the expression of tristetraprolin mRNA was inversely correlated with that of the full-length cyclooxygenase-2 transcript, and transfection of tristetraprolin into HCA-7 cells reduced the level of full-length cyclooxygenase-2 mRNA. However, the truncated transcript escaped tristetraprolin binding and downregulation.
Sawaoka et al. (Tue,) studied this question.