MicroRNA 186 (miR-186)

MicroRNA 186 (miR-186) is a small, endogenous non-coding RNA of approximately 22 nucleotides, processed from the *MIR186* gene located within intron 8 of the ZRANB2 gene on human chromosome 1[3]. It acts as a post-transcriptional regulator by binding to complementary sequences in the 3′ untranslated regions (3′-UTRs) of target messenger RNAs (mRNAs), leading to their degradation or inhibition of translation[1][3]. miR-186 is widely expressed in human tissues and participates in diverse biological processes including regulation of the cell cycle, cell proliferation, apoptosis, differentiation, and migration. Altered miR-186 expression is observed in numerous cancers, often acting as a tumor suppressor by targeting oncogenic pathways, though it can also function as an oncomir (oncogenic miRNA) depending on the cellular context[3][5]. Validated targets of miR-186 include key regulators such as MAP3K2, SKP2, PTEN, CCND1, CDK2, CDK6, and others, implicating miR-186 in control of tumor growth, metastasis, and drug resistance[1][2][3]. Its dual role as both tumor suppressor and oncomir presents therapeutic opportunities as well as challenges, making it a focus for cancer biomarker development and as a potential therapeutic target in precision oncology[3][5]. Note: - miR-186 is not an enzyme, receptor, or transporter, but a regulatory RNA ("Other" in molecular classification). - There are currently no approved drugs directly targeting miR-186, but its manipulation via oligonucleotide-based therapeutics is under investigation. - The main challenge for therapy is its context-dependent action and the potential for broad, off-target effects due to its involvement in multiple signaling pathways[3].

Other names

hsa-mir-186MIR186MIRN186miR-186-5p

Post-transcriptional regulation of mRNA by binding to 3′ UTRs, leading to mRNA degradation or translational suppression[1][3][4] Alters the expression of specific oncogenes and tumor suppressors, including MAP3K2, SKP2, PTEN, CCND1, CDK2, CDK6, SIRT6, ROCK1, YY1, Twist1, GOLPH3, VEGF-C, etc[1][2][3]