Phorbol-12-myristate-13-acetate-mediated stabilization of leukemia inhibitory factor (lif) mRNA: involvement of Nucleolin and PCBP1

The Biochemical Journal
Alina ChakrabortySumita Sengupta Bandyopadhyay

Abstract

Leukemia inhibitory factor (LIF) is a potent pleiotropic cytokine involved in diverse biological activities, thereby requiring precise spatial and temporal control of its expression. The present study reveals that enhanced expression of LIF in response to PMA (phorbol-12-myristate-13-acetate) in human histiocytic lymphoma cell line U937 largely happens through stabilization of its mRNA. Functional characterization of the long 3'-untranslated region of human lif mRNA revealed several conserved sequences with conventional cis-acting elements. A 216 nucleotide containing proximal cis-element with two AUUUA pentamers and four poly-rC sequences demonstrated significant mRNA destabilizing potential, which, on treatment with PMA, showed stabilizing activity. Affinity chromatography followed by western blot and RNA co-immunoprecipitation of PMA-treated U937 extract identified Nucleolin and PCBP1 as two protein trans-factors interacting with lif mRNA, specifically to the proximal non-conventional AU-rich region. PMA induced nucleo-cytoplasmic translocation of both Nucleolin and PCBP1. RNA-dependent in vivo co-association of both these proteins with lif mRNA was demonstrated by decreased co-precipitation in the presence of RNase. Ectopic...Continue Reading

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