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The RNA-binding protein HuR binds at 3′ untranslated regions (UTRs) of target transcripts, thereby protecting them against degradation. We show that HuR directly interacts with cellular retinoic acid-binding protein 2 (CRABP2), a protein known to transport RA from the cytosol to the nuclear retinoic acid receptor (RAR). Association with CRABP2 dramatically increases the affinity of HuR toward target mRNAs and enhances the stability of such transcripts, including that of Apaf-1, the major protein in the apoptosome. We show further that its cooperation with HuR contributes to the ability of CRABP2 to suppress carcinoma cell proliferation. The data show that CRABP2 displays antioncogenic activities both by cooperating with RAR and by stabilizing antiproliferative HuR target transcripts. The observation that CRABP2 controls mRNA stabilization by HuR reveals that in parallel to participating in transcriptional regulation, the protein is closely involved in posttranscriptional regulation of gene expression.

Transcript Stabilization by the RNA-Binding Protein HuR Is Regulated by Cellular Retinoic Acid-Binding Protein 2