miR-205 response elements on BCL2 mRNA

The miR-205 response elements on BCL2 mRNA are specific nucleotide sequences located within the 3'-untranslated region (3'-UTR) of the B-cell lymphoma 2 (BCL2) messenger RNA. These elements serve as binding sites for microRNA-205 (miR-205), a small non-coding RNA that regulates gene expression post-transcriptionally. In many epithelial cancers, such as prostate, breast, and colon cancer, miR-205 acts as a tumor suppressor by binding to these response elements, which leads to the degradation of BCL2 mRNA or the inhibition of its translation. Since BCL2 is a potent anti-apoptotic protein, its downregulation by miR-205 promotes programmed cell death and sensitizes tumor cells to chemotherapeutic agents like cisplatin and doxorubicin. Conversely, the loss of miR-205 expression is a common feature in advanced malignancies, contributing to BCL2 overexpression, apoptosis evasion, and therapeutic resistance. Experimental therapies utilizing miR-205 mimics aim to restore this regulatory interaction to suppress tumor growth and overcome chemoresistance.

Other names

BCL2 3'-UTR miR-205 binding sitemiR-205 microRNA response element on BCL2BCL2-miR205 interaction siteBCL2-MRE-miR205

MicroRNA-205 (miR-205) binds to specific response elements in the 3'-untranslated region (3'-UTR) of BCL2 mRNA, leading to mRNA degradation or translational repression. This reduction in BCL2 protein levels lowers the threshold for apoptosis by increasing the BAX/BCL2 ratio and activating the intrinsic apoptotic pathway, including the release of cytochrome c and activation of caspases 9 and 3.