PMID- 33415022 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210111 IS - 2156-6976 (Print) IS - 2156-6976 (Electronic) IS - 2156-6976 (Linking) VI - 10 IP - 12 DP - 2020 TI - A new compound targets the AF-1 of androgen receptor and decreases its activity and protein levels in prostate cancer cells. PG - 4607-4623 AB - Increased expression levels of constitutively active androgen receptor splice variants (AR-Vs) cause alterations in AR signaling, resulting in drug resistance and failed hormone therapy among patients with advanced prostate cancers. Several available compounds targeting the androgen axis and AR signaling have not demonstrated efficacy in preventing prostate cancer recurrence. Here, we investigated whether a new agent, 6-[6-ethoxy-5-ispropoxy-3,4-dihydroisoquinolin-2[1H)-yl]-N-[6-methylpyridin-2-yl]nicotinamide (EIQPN), has the potential for treating advanced prostate cancer. EIQPN interacted with the AR-activation fragment-1 (AF-1) domain and blocked its androgen-independent activity, robustly decreased the protein levels of AR and variants in prostate cancer cells by inducing AR protein degradation, and inhibited the androgen-independent proliferation of various AR-positive prostate cancer cells. In xenograft mouse models, EIQPN blocked the tumor growth of androgen-independent prostate cancer cells. Overall, these findings indicate that EIQPN could serve as a novel therapeutic agent for advanced recurrent prostate cancers. CI - AJCR Copyright (c) 2020. FAU - Tran, Tuyen Thanh AU - Tran TT AD - School of Biological Sciences and Technology, Chonnam National University Gwangju, Korea. FAU - Song, Chin-Hee AU - Song CH AD - School of Biological Sciences and Technology, Chonnam National University Gwangju, Korea. FAU - Kim, Kyung-Jin AU - Kim KJ AD - School of Biological Sciences and Technology, Chonnam National University Gwangju, Korea. FAU - Lee, Keesook AU - Lee K AD - School of Biological Sciences and Technology, Chonnam National University Gwangju, Korea. LA - eng PT - Journal Article DEP - 20201201 PL - United States TA - Am J Cancer Res JT - American journal of cancer research JID - 101549944 PMC - PMC7783748 OTO - NOTNLM OT - Prostate cancer OT - androgen receptor OT - androgen-independent activity OT - protein degradation OT - splice variant COIS- None. EDAT- 2021/01/09 06:00 MHDA- 2021/01/09 06:01 PMCR- 2020/12/01 CRDT- 2021/01/08 06:12 PHST- 2020/10/11 00:00 [received] PHST- 2020/11/12 00:00 [accepted] PHST- 2021/01/08 06:12 [entrez] PHST- 2021/01/09 06:00 [pubmed] PHST- 2021/01/09 06:01 [medline] PHST- 2020/12/01 00:00 [pmc-release] PST - epublish SO - Am J Cancer Res. 2020 Dec 1;10(12):4607-4623. eCollection 2020.