PMID- 29179464 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20220330 IS - 1949-2553 (Electronic) IS - 1949-2553 (Linking) VI - 8 IP - 51 DP - 2017 Oct 24 TI - Urokinase-type plasminogen activator receptor inhibits apoptosis in triple-negative breast cancer through miR-17/20a suppression of death receptors 4 and 5. PG - 88645-88657 LID - 10.18632/oncotarget.20435 [doi] AB - Dissection and understanding of the molecular pathways driving triple-negative breast cancer (TNBC) are urgently needed to develop efficient tailored therapies. Aside from cell invasion and metastasis, the urokinase-type plasminogen activator receptor (uPAR) has been linked to apoptosis resistance in breast tumors. We explored the mechanism of uPAR-disrupted apoptosis in breast cancer. We found that depletion of uPAR by RNAi increases death receptor 4 (DR4) and death receptor 5 (DR5) expression and triggers TRAIL-induced apoptosis in TNBC cells. The microRNAs miR-17-5p and miR-20a inhibit cell apoptosis via suppression of DR4/DR5. We provide evidence that uPAR enhances miR-17-5p/20a expression through upregulation of c-myc. Blocking miR-17-5p/20a with antagomiRNA suppressed the growth of uPAR-overexpressing breast tumor xenografts in mice. These results indicate that uPAR suppresses cell apoptosis by inhibiting the c-myc-miR-17/5p/20a-DR4/DR5 pathway. Therapy directed at uPAR-induced miR-17/20a is a potential option for breast cancer and TNBC. FAU - Li, Xin AU - Li X AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. FAU - Wu, Bo AU - Wu B AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. FAU - Chen, Lizhao AU - Chen L AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. FAU - Ju, Ying AU - Ju Y AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. FAU - Li, Changfei AU - Li C AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. FAU - Meng, Songdong AU - Meng S AD - CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China. AD - College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China. LA - eng PT - Journal Article DEP - 20170824 PL - United States TA - Oncotarget JT - Oncotarget JID - 101532965 PMC - PMC5687634 OTO - NOTNLM OT - DR5 OT - apoptosis OT - miR-17-5p OT - miR-20a OT - uPAR COIS- CONFLICTS OF INTEREST No potential conflicts of interest were disclosed. EDAT- 2017/11/29 06:00 MHDA- 2017/11/29 06:01 PMCR- 2017/10/24 CRDT- 2017/11/29 06:00 PHST- 2016/12/21 00:00 [received] PHST- 2017/07/23 00:00 [accepted] PHST- 2017/11/29 06:00 [entrez] PHST- 2017/11/29 06:00 [pubmed] PHST- 2017/11/29 06:01 [medline] PHST- 2017/10/24 00:00 [pmc-release] AID - 20435 [pii] AID - 10.18632/oncotarget.20435 [doi] PST - epublish SO - Oncotarget. 2017 Aug 24;8(51):88645-88657. doi: 10.18632/oncotarget.20435. eCollection 2017 Oct 24.