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Functional analysis of LAT3 in prostate cancer: Its downstream target and relationship with androgen receptor |
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| Authors: | Junryo Rii Shinichi Sakamoto Masahiro Sugiura Manato Kanesaka Ayumu Fujimoto Yasutaka Yamada Maihulan Maimaiti Keisuke Ando Ken Wakai Minhui Xu Yusuke Imamura Norihisa Shindo Toru Hirota Atsushi Kaneda Yoshikatsu Kanai Yuzuru Ikehara Naohiko Anzai Tomohiko Ichikawa |
| Affiliation: | 1. Department of Urology, Chiba University Graduate School of Medicine, Chiba, Japan;2. Department of Urology, Chiba University Graduate School of Medicine, Chiba, Japan Department of Molecular Oncology, Chiba University Graduate School of Medicine, Chiba, Japan;3. Department of Tumor Pathology, Chiba University Graduate School of Medicine, Chiba, Japan;4. Department of Urology, Chiba University Graduate School of Medicine, Chiba, Japan Department of Pharmacology, Chiba University Graduate School of Medicine, Chiba, Japan;5. Department of Urology, Chiba University Graduate School of Medicine, Chiba, Japan Department of Tumor Pathology, Chiba University Graduate School of Medicine, Chiba, Japan;6. Bio-system Pharmacology, Osaka University Graduate School of Medicine, Osaka, Japan;7. Division of Experimental Pathology, Cancer Institute of the Japanese Foundation for Cancer Research, Tokyo, Japan;8. Department of Molecular Oncology, Chiba University Graduate School of Medicine, Chiba, Japan;9. Department of Pharmacology, Chiba University Graduate School of Medicine, Chiba, Japan |
| Abstract: | L-type amino acid transporter 3 (LAT3, SLC43A1) is abundantly expressed in prostate cancer (PC) and is thought to play an essential role in PC progression through the cellular uptake of essential amino acids. Here, we analyzed the expression, function, and downstream target of LAT3 in PC. LAT3 was highly expressed in PC cells expressing androgen receptor (AR), and its expression was increased by dihydrotestosterone treatment and decreased by bicalutamide treatment. In chromatin immunoprecipitation sequencing of AR, binding of AR to the SLC43A1 region was increased by dihydrotestosterone stimulation. Knockdown of LAT3 inhibited cell proliferation, migration, and invasion, and the phosphorylation of p70S6K and 4EBP-1. Separase (ESPL1) was identified as a downstream target of LAT3 by RNA sequencing analysis. In addition, immunostaining of prostatectomy specimens was performed. In the multivariate analysis, high expression of LAT3 was an independent prognostic factor for recurrence-free survival (hazard ratio: 3.24; P = .0018). High LAT3 expression was correlated with the pathological T stage and a high International Society of Urological Pathology grade. In summary, our results suggest that LAT3 plays an important role in the progression of PC. |
| Keywords: | amino acid transporter androgen receptor LAT3 prostate cancer Separase |