Abstract
Abnormal cell proliferation caused by abnormal transcription regulation mechanism seems to be one of the reasons for the progression of breast cancer and also the pathological basis. MicroRNA-142-5p (miR-142-5p) is a low-expressed miRNA in breast cancer. The role of MKL-1’s regulation of DNMT1 in breast cancer cell proliferation and migration is still unclear. MKL-1 (myocardin related transcription factor A) can bind to the conserved cis-regulatory element CC (A/T) 6GG (called CarG box) in the promoter to regulate the transcription of miR-142-5p. The expressions of miR-142-5p and MKL-1 are positively correlated. In addition, it has been proved that DNMT1 is the target of miR-142-5p, which inhibits the expression of DNMT1 by targeting the 3′-UTR of DNMT1, thereby forming a feedback loop and inhibiting the migration and proliferation of breast cancer. Our data provide important and novel insights into the MKL-1/miR-142-5p/DNMT1/maspin signaling pathway and may become a new idea for breast cancer diagnosis, treatment, and prognosis.
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