Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan, China.
Department of Biological Repositories, Zhongnan Hospital of Wuhan University, Wuhan, China.
Cell Death Dis. 2023 Nov 27;14(11):774. doi: 10.1038/s41419-023-06298-7.
Clear cell renal cell carcinoma (ccRCC) is a type of kidney cancer that is both common and aggressive, with a rising incidence in recent decades. Hypoxia is a key factor that plays a vital role in the tumorigenesis and metastasis of malignancy. However, the precise mechanisms of hypoxia driving ccRCC progression were not totally uncovered. Our study found that hypoxia level was elevated in ccRCC and might be an independent risk factor of prognosis in ccRCC patients. We identified a key protein PLOD2 was induced under hypoxic conditions and strongly associated with poor prognosis in ccRCC patients. When PLOD2 was depleted, the proliferation and migration of ccRCC cells were reduced in vitro and in vivo, while overexpression of PLOD2 had the opposite effect. Mechanically, the study further revealed that PLOD2 was transcriptionally activated by HIF1A, which binds to a specific promoter region of the PLOD2 gene. PLOD2 was also shown to interact with EGFR, leading to the phosphorylation of the receptor. Furthermore, PLOD2 was responsible for binding to the extracellular domain of EGFR, which ultimately activated the AKT signaling pathway, thus promoting the malignant progression of ccRCC. Treatment with the PLOD2 inhibitor Minoxidil significantly suppressed ccRCC progression by inactivating the EGFR/AKT signaling axis. In summary, the findings of this study shed light on the molecular mechanisms behind PLOD2 expression in ccRCC and suggest that it may serve as a potential predictor and therapeutic target for the clinical prognosis and treatment of ccRCC.
透明细胞肾细胞癌(ccRCC)是一种常见且侵袭性强的肾癌,近几十年来发病率不断上升。缺氧是肿瘤发生和恶性转移的关键因素。然而,缺氧驱动 ccRCC 进展的确切机制尚未完全揭示。我们的研究发现,ccRCC 中的缺氧水平升高,可能是 ccRCC 患者预后的独立危险因素。我们鉴定出一种关键蛋白 PLOD2 在缺氧条件下被诱导,并且与 ccRCC 患者的不良预后强烈相关。当 PLOD2 被耗尽时,ccRCC 细胞的增殖和迁移在体外和体内均减少,而过表达 PLOD2 则产生相反的效果。在机制上,该研究进一步揭示了 PLOD2 由 HIF1A 转录激活,HIF1A 结合 PLOD2 基因的特定启动子区域。还表明 PLOD2 与 EGFR 相互作用,导致受体磷酸化。此外,PLOD2 负责与 EGFR 的细胞外结构域结合,最终激活 AKT 信号通路,从而促进 ccRCC 的恶性进展。用 PLOD2 抑制剂米诺地尔治疗可通过使 EGFR/AKT 信号轴失活来显著抑制 ccRCC 进展。总之,本研究结果揭示了 PLOD2 在 ccRCC 中表达的分子机制,并表明它可能作为 ccRCC 临床预后和治疗的潜在预测因子和治疗靶点。
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