Beate Vajen, Rahul Bhowmick, Luisa Greiwe, Vera Schäffer, Marlies Eilers, Thea Reinkens, Amelie Stalke, Gunnar Schmidt, Jan Fiedler, Thomas Thum, David S DeLuca, Ian D Hickson, Brigitte Schlegelberger, Thomas Illig, Britta Skawran
Chromosomal instability (CIN) can be a driver of tumorigenesis but is also a promising therapeutic target for cancer associated with poor prognosis such as triple negative breast cancer (TNBC). The treatment of TNBC cells with defects in DNA repair genes with poly(ADP-ribose) polymerase inhibitor (PARPi) massively increases CIN, resulting in apoptosis. Here, we identified a previously unknown role of microRNA-449a in CIN. The transfection of TNBC cell lines HCC38, HCC1937 and HCC1395 with microRNA-449a mimics led to induced apoptosis, reduced cell proliferation, and reduced expression of genes in homology directed repair (HDR) in microarray analyses...
May 4, 2022: International Journal of Molecular Sciences