title: 17-ABAG, a novel geldanamycin derivative, inhibits LNCaP-cell proliferation through heat shock protein 90 inhibition.
abstract: Prostate cancer is one of the most common cancer types worldwide. In 2014, there were an estimated 233,000 new cases and 29,480 mortalities in the United States. Androgen deprivation therapy, also called androgen suppression therapy, targets androgen signaling and remains the standard treatment for patients with advanced prostate cancer; however, responses to treatment are not durable and most patients advance to castrate-resistant prostate cancer. Therefore, novel therapeutic strategies to treat prostate cancer are urgently required. Heat shock protein 90 (Hsp90) is a chaperone protein that has been shown to regulate the progression of tumor cells. Numerous Hsp90 inhibitors show anti-tumor activity and several of them have entered clinical trials. Geldanamycin (GA) was identified as the first Hsp90 inhibitor, but shows hepatotoxicity at its effective concentrations, limiting its clinical use. In previous studies by our group, the GA derivative 17-ABAG was designed and synthesized. The present study showed that 17-ABAG inhibits the proliferation and induces apoptosis of LNCaP, an androgen-dependent prostate cancer cell line, in vitro through a classic apoptotic pathway. 17-ABAG also downregulated the Hsp90 client protein and inhibited androgen receptor nuclear localization in LNCaP cells. In addition, 17-ABAG suppressed the growth of LNCaP xenograft tumors without any obvious side-effects. The present study demonstrated that 17-ABAG is a promising anti-tumor agent and warrants further validation in prospective studies.
authors.affiliation: Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China.
authors.forename: Ruixian
authors.initials: R
authors.lastname: Peng
authors.affiliation: Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong 250012, P.R. China.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong 250012, P.R. China.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Lu
authors.affiliation: Key Laboratory of Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong 250012, P.R. China.
authors.forename: Yuemao
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China.
authors.forename: Jifeng
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China.
authors.forename: Guowei
authors.initials: G
authors.lastname: Shi
mesh_terms: D000728:Androgens / Q000378:metabolism; D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology / Q000627:therapeutic use*; D017209:Apoptosis / Q000187:drug effects; D016227:Benzoquinones / Q000737:chemistry* / Q000494:pharmacology / Q000627:therapeutic use*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D006801:Humans; D047029:Lactams, Macrocyclic / Q000737:chemistry* / Q000494:pharmacology / Q000627:therapeutic use*; D008297:Male; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D011467:Prostate / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D011471:Prostatic Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D011944:Receptors, Androgen / Q000378:metabolism
chemical_list: D000728:Androgens; D000970:Antineoplastic Agents; D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D011944:Receptors, Androgen; C001277:geldanamycin