Australian Prostate Cancer Research Centre, Queensland, Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Princess Alexandra Hospital, Translational Research Institute, Woolloongabba, Queensland, Australia.
Kinghorn Centre for Clinical Genomics, Garvan Institute of Medical Research, Sydney, Australia.
Mol Cancer Res. 2019 May;17(5):1166-1179. doi: 10.1158/1541-7786.MCR-18-1147. Epub 2019 Feb 26.
lipogenesis is a well-described androgen receptor (AR)-regulated metabolic pathway that supports prostate cancer tumor growth by providing fuel, membrane material, and steroid hormone precursor. In contrast, our current understanding of lipid supply from uptake of exogenous lipids and its regulation by AR is limited, and exogenous lipids may play a much more significant role in prostate cancer and disease progression than previously thought. By applying advanced automated quantitative fluorescence microscopy, we provide the most comprehensive functional analysis of lipid uptake in cancer cells to date and demonstrate that treatment of AR-positive prostate cancer cell lines with androgens results in significantly increased cellular uptake of fatty acids, cholesterol, and low-density lipoprotein particles. Consistent with a direct, regulatory role of AR in this process, androgen-enhanced lipid uptake can be blocked by the AR-antagonist enzalutamide, but is independent of proliferation and cell-cycle progression. This work for the first time comprehensively delineates the lipid transporter landscape in prostate cancer cell lines and patient samples by analysis of transcriptomics and proteomics data, including the plasma membrane proteome. We show that androgen exposure or deprivation regulates the expression of multiple lipid transporters in prostate cancer cell lines and tumor xenografts and that mRNA and protein expression of lipid transporters is enhanced in bone metastatic disease when compared with primary, localized prostate cancer. Our findings provide a strong rationale to investigate lipid uptake as a therapeutic cotarget in the fight against advanced prostate cancer in combination with inhibitors of lipogenesis to delay disease progression and metastasis. IMPLICATIONS: Prostate cancer exhibits metabolic plasticity in acquiring lipids from uptake and lipogenesis at different disease stages, indicating potential therapeutic benefit by cotargeting lipid supply.
脂肪生成是一个被充分描述的雄激素受体 (AR) 调控的代谢途径,通过提供燃料、膜材料和甾体激素前体来支持前列腺癌肿瘤的生长。相比之下,我们目前对于通过摄取外源性脂质来提供脂质供应及其受 AR 调节的了解是有限的,外源性脂质在前列腺癌和疾病进展中的作用可能比之前认为的更为重要。通过应用先进的自动定量荧光显微镜,我们提供了迄今为止对癌细胞中脂质摄取的最全面的功能分析,并证明雄激素处理 AR 阳性前列腺癌细胞系会导致脂肪酸、胆固醇和低密度脂蛋白颗粒的细胞摄取显著增加。与 AR 在这个过程中的直接调控作用一致,雄激素增强的脂质摄取可以被 AR 拮抗剂恩扎鲁胺阻断,但与增殖和细胞周期进展无关。这项工作首次通过分析转录组学和蛋白质组学数据(包括质膜蛋白质组学),全面描绘了前列腺癌细胞系和患者样本中的脂质转运体图谱。我们表明,雄激素暴露或剥夺调节前列腺癌细胞系和肿瘤异种移植物中多种脂质转运体的表达,并且与原发性局限性前列腺癌相比,骨转移疾病中脂质转运体的 mRNA 和蛋白表达增强。我们的发现为研究脂质摄取作为与抑制脂肪生成联合治疗晚期前列腺癌的治疗共靶标提供了强有力的依据,以延迟疾病进展和转移。意义:前列腺癌在不同疾病阶段从摄取和脂肪生成中获取脂质时表现出代谢可塑性,表明通过共靶向脂质供应可能具有潜在的治疗益处。