In molecular biology, mir-221 microRNA (and its paralogue, mir-222) is a short RNA molecule. MicroRNAs function to regulate the expression levels of other genes by several mechanisms.
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mir-221 is an oncogenic microRNA.[1] It targets CD117, which then prevents cell migration and proliferation in endothelial cells.[2][3]
miR-221 is known as an anti angiogenic miRNA.[4][2]
Recent important studies have reported that miR-221 is also involved in induction of angiogenesis.[5][6][7]
RNA induced Silencing Complex (RISC) proteins SND1 and AEG-1 induces miR-221 expression in Liver cancer.[8]
In liver cancer miR-221 induces the tumor angiogenesis.[5] miR-221 detection in human faeces can be a non-invasive screening marker for colorectal cancer.[9]
miR-221 has been identified as playing a role in androgenetic alopecia.[10]
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- Dai R, Li J, Liu Y, Yan D, Chen S, Duan C, Liu X, He T, Li H (2010). "miR-221/222 suppression protects against endoplasmic reticulum stress-induced apoptosis via p27(Kip1)- and MEK/ERK-mediated cell cycle regulation". Biol Chem. 391 (7): 791–801. doi:10.1515/BC.2010.072. PMID 20624000. S2CID 23085890.
- Chun-Zhi Z, Lei H, An-Ling Z, Yan-Chao F, Xiao Y, Guang-Xiu W, Zhi-Fan J, Pei-Yu P, Qing-Yu Z, Chun-Sheng K (2010). "MicroRNA-221 and microRNA-222 regulate gastric carcinoma cell proliferation and radioresistance by targeting PTEN". BMC Cancer. 10: 367. doi:10.1186/1471-2407-10-367. PMC 2914702. PMID 20618998.
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- Fu X, Wang Q, Chen J, Huang X, Chen X, Cao L, Tan H, Li W, Zhang L, Bi J, Su Q, Chen L (2010). "Clinical significance of miR-221 and its inverse correlation with p27(Kip1) in hepatocellular carcinoma". Mol Biol Rep. 38 (5): 3029–35. doi:10.1007/s11033-010-9969-5. PMID 20146005. S2CID 24880277.
- Hu G, Gong AY, Liu J, Zhou R, Deng C, Chen XM (2010). "miR-221 suppresses ICAM-1 translation and regulates interferon-gamma-induced ICAM-1 expression in human cholangiocytes". Am J Physiol Gastrointest Liver Physiol. 298 (4): G542–50. doi:10.1152/ajpgi.00490.2009. PMC 2853302. PMID 20110463.
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- Pineau P, Volinia S, McJunkin K, Marchio A, Battiston C, Terris B, Mazzaferro V, Lowe SW, Croce CM, Dejean A (2010). "miR-221 overexpression contributes to liver tumorigenesis". Proc Natl Acad Sci U S A. 107 (1): 264–9. Bibcode:2010PNAS..107..264P. doi:10.1073/pnas.0907904107. PMC 2806773. PMID 20018759.
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