Satyananda Vikas, Oshi Masanori, Tokumaru Yoshihisa, Maiti Aparna, Hait Nitai, Matsuyama Ryusei, Endo Itaru, Takabe Kazuaki
Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center Buffalo, NY 14263, USA.
Department of Gastroenterological Surgery Yokohama, Kanagawa 236-004, Japan.
Am J Cancer Res. 2021 Sep 15;11(9):4394-4407. eCollection 2021.
Sphingosine-1-Phosphate (S1P) is produced by Sphingosine Kinase 1 (SphK1) in the cell and is transported out of the cells by ABCC1 transporter. S1P induces inflammation, angiogenesis and modulates tumor immune microenvironment (TIME) in autocrine and paracrine manner. We hypothesized that high S1P export is associated with hepatocellular carcinoma (HCC) progression and worse survival. Transcriptome linked with clinical data were obtained from a total of 533 patients from TCGA (The Cancer Genome Atlas)-HCC (n = 350), GSE6764 (n = 75), and GSE89377 (n = 108) cohorts. Both SphK1 and ABCC1 were expressed higher in aggressive HCC than normal liver or cirrhosis and correlated with MKi67 expression. High S1P export by high expression of both SphK1 and ABCC1 enriched gene sets related with cell proliferation (E2F targets, G2M checkpoint, MYC targets), inflammation (Inflammatory response, TNFα, IL6), angiogenesis, metastasis (TGF-β, epithelial-mesenchymal transition), and immune response (allograft rejection, complement, interferon-gamma) in gene set enrichment analysis. High S1P export was associated with elevation of HGF, HSP90AA1, TRAF2, and AKR1B10. It was also associated with high intratumor heterogeneity, leucocyte fraction, macrophage regulation and lymphocyte infiltration, as well as T helper type2 cells, macrophages, dendritic cells, CD4 T memory activated cells, B-cells and cytolytic activity score in TIME. High S1P export was associated with significantly worse disease specific survival ( = 0.034) and overall survival ( = 0.004) compared to low S1P export group. In conclusion, simultaneous high expression of SphK1 and ABCC1 that reflect S1P export is associated with enhancement of both HCC progression and immune response. Given that S1P export was also associated with worse survival, we cannot help but speculate that pro-cancer pathways activated by S1P may overwhelm the anti-cancer immune response mediated by S1P.
鞘氨醇-1-磷酸(S1P)由细胞内的鞘氨醇激酶1(SphK1)产生,并通过ABCC1转运蛋白转运出细胞。S1P以自分泌和旁分泌方式诱导炎症、血管生成并调节肿瘤免疫微环境(TIME)。我们推测高S1P输出与肝细胞癌(HCC)进展及较差的生存率相关。从TCGA(癌症基因组图谱)-HCC队列(n = 350)、GSE6764队列(n = 75)和GSE89377队列(n = 108)的总共533例患者中获取了与临床数据相关的转录组。SphK1和ABCC1在侵袭性HCC中的表达均高于正常肝脏或肝硬化,且与MKi67表达相关。在基因集富集分析中,SphK1和ABCC1高表达导致的高S1P输出富集了与细胞增殖(E2F靶标、G2M检查点、MYC靶标)、炎症(炎症反应、TNFα、IL6)、血管生成、转移(TGF-β、上皮-间质转化)和免疫反应(同种异体移植排斥、补体、干扰素-γ)相关的基因集。高S1P输出与HGF、HSP90AA1、TRAF2和AKR1B10的升高相关。它还与高肿瘤内异质性、白细胞分数、巨噬细胞调节和淋巴细胞浸润以及TIME中的2型辅助性T细胞、巨噬细胞、树突状细胞、CD4 T记忆活化细胞、B细胞和细胞溶解活性评分相关。与低S1P输出组相比,高S1P输出与显著更差的疾病特异性生存率(P = 0.034)和总生存率(P = 0.004)相关。总之,反映S1P输出的SphK1和ABCC1同时高表达与HCC进展和免疫反应增强相关。鉴于S1P输出也与较差的生存率相关,我们不禁推测S1P激活的促癌途径可能会压倒由S1P介导的抗癌免疫反应。