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Mol. Cell. Biol., 07 1996, 3300-3307, Vol 16, No. 7
L Yang, CN Steussy, DK Fuhrer, J Hamilton and YC Yang
12-O-Tetradecanoylphorbol-13-acetate (TPA) stimulation of PU-34 cells, a
primate bone marrow stromal cell line, resulted in a prolonged elevation of
interleukin-11 (IL-11) mRNA, which can be inhibited by protein synthesis
inhibitors. Nuclear run-on assays and actinomycin D experiments
demonstrated that the up-regulation of IL-11 gene expression is mainly
controlled at the posttranscriptional level through the protein kinase C
(PKC) pathway. Inhibition of PKC activity by calphostin C generated an
IL-11 mRNA degradation intermediate in TPA- stimulated PU-34 cells. This
intermediate retains the 5' untranslated region (5'UTR) and coding region
of the IL-11 mRNA but has lost the poly(A) tail and the 3'UTR. The
mechanisms underlying IL-11 mRNA stabilization were further investigated by
transfections with a variety of chimeric IL-11 constructs and deletion
mutants. Two important observations were made from these transient
expression experiments: (i) the same 3'UTR of IL-11 mRNA shown to confer
instability in one chimeric transcript may not function as a destabilizer
in another chimeric RNA, and (ii) the 5'UTR, coding region, and 3'UTR all
contribute to IL-11 mRNA decay, and labile IL-11 deletion transcripts are
not necessarily stabilized by TPA stimulation. Our study suggests that
multiple regions within the IL-11 mRNA are involved in TPA- stimulated
IL-11 mRNA stabilization, possibly through a unique RNA folding
conformation involving interactions of various RNA sequences within the
IL-11 mRNA molecule.
Copyright © 1996, American Society for Microbiology
Interleukin-11 mRNA stabilization in phorbol ester-stimulated primate bone marrow stromal cells
Department of Biochemistry and Molecular Biology, Walter Oncology Center, Indiana University School of Medicine, Indianapolis, 46202, USA.
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