Rapamycin-insensitive companion of mammalian target of rapamycin mRNA 3' untranslated region (RICTOR mRNA 3'UTR)

The Rapamycin-insensitive companion of mammalian target of rapamycin (RICTOR) mRNA 3' untranslated region (3'UTR) is a key regulatory sequence that controls the expression of the RICTOR protein, a scaffold component essential for the assembly and activity of the mTORC2 complex. This 3'UTR contains conserved binding sites for various microRNAs (miRNAs), such as miR-152, miR-143, and miR-218, which post-transcriptionally repress RICTOR expression by inducing mRNA degradation or inhibiting translation (PubMed: 25600155, PubMed: 28423589). In several human malignancies, including breast cancer, glioma, and lung adenocarcinoma, the loss of these regulatory miRNAs or alterations in the 3'UTR leads to RICTOR overexpression. This overexpression results in the hyperactivation of the mTORC2 pathway, which subsequently promotes Akt-mediated cell survival, metabolic reprogramming, and epithelial-mesenchymal transition (PubMed: 21844185). As a therapeutic target, the RICTOR mRNA 3'UTR is being explored for the development of miRNA mimics and antisense oligonucleotides (ASOs) aimed at restoring translational control and suppressing oncogenic signaling. However, therapeutic challenges include ensuring the specificity of RNA-targeted agents to avoid off-target effects and managing the systemic consequences of mTORC2 inhibition on glucose homeostasis.

Other names

RICTOR 3'-UTRRictor 3' untranslated regionhRictor 3'UTRRICTOR 3-prime untranslated region

Post-transcriptional gene silencing via microRNA-mediated mRNA degradation or translational repression, or antisense oligonucleotide-induced RNase H cleavage.