PMID- 37483592 OWN - NLM STAT- MEDLINE DCOM- 20230725 LR - 20230725 IS - 1664-3224 (Electronic) IS - 1664-3224 (Linking) VI - 14 DP - 2023 TI - Insight of a lipid metabolism prognostic model to identify immune landscape and potential target for retroperitoneal liposarcoma. PG - 1209396 LID - 10.3389/fimmu.2023.1209396 [doi] LID - 1209396 AB - INTRODUCTION: The exploration of lipid metabolism dysregulation may provide novel perspectives for retroperitoneal liposarcoma (RPLS). In our study, we aimed to investigate potential targets and facilitate further understanding of immune landscape in RPLS, through lipid metabolism-associated genes (LMAGs) based prognostic model. METHODS: Gene expression profiles and corresponding clinical information of 234 cases were enrolled from two public databases and the largest retroperitoneal tumor research center of East China, including cohort-TCGA (n=58), cohort-GSE30929 (n=92), cohort-FD (n=50), cohort-scRNA-seq (n=4) and cohort-validation (n=30). Consensus clustering analysis was performed to identify lipid metabolism-associated molecular subtypes (LMSs). A prognostic risk model containing 13 LMAGs was established using LASSO algorithm and multivariate Cox analysis in cohort-TCGA. ESTIMATE, CIBERSORT, XCELL and MCP analyses were performed to visualize the immune landscape. WGCNA was used to identify three hub genes among the 13 model LMAGs, and preliminarily validated in both cohort-GSE30929 and cohort-FD. Moreover, TIMER was used to visualize the correlation between antigen-presenting cells and potential targets. Finally, single-cell RNA-sequencing (scRNA-seq) analysis of four RPLS and multiplexed immunohistochemistry (mIHC) were performed in cohort-validation to validate the discoveries of bioinformatics analysis. RESULTS: LMS1 and LMS2 were characterized as immune-infiltrated and -excluded tumors, with significant differences in molecular features and clinical prognosis, respectively. Elongation of very long chain fatty acids protein 2 (ELOVL2), the enzyme that catalyzed the elongation of long chain fatty acids, involved in the maintenance of lipid metabolism and cellular homeostasis in normal cells, was identified and negatively correlated with antigen-presenting cells and identified as a potential target in RPLS. Furthermore, ELOVL2 was enriched in LMS2 with significantly lower immunoscore and unfavorable prognosis. Finally, a high-resolution dissection through scRNA-seq was performed in four RPLS, revealing the entire tumor ecosystem and validated previous findings. DISCUSSION: The LMS subgroups and risk model based on LMAGs proposed in our study were both promising prognostic classifications for RPLS. ELOVL2 is a potential target linking lipid metabolism to immune regulations against RPLS, specifically for patients with LMS2 tumors. CI - Copyright (c) 2023 Wang, Tao, Fan, Wang, Rong, Hou, Zhou, Lu, Hong, Ma, Zhang and Tong. FAU - Wang, Zhenyu AU - Wang Z AD - First Affiliated Hospital, Anhui University of Science and Technology, Huainan, China. FAU - Tao, Ping AU - Tao P AD - Department of Laboratory Medicine, Shanghai Traditional Chinese Medicine-Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China. FAU - Fan, Peidang AU - Fan P AD - First Affiliated Hospital, Anhui University of Science and Technology, Huainan, China. FAU - Wang, Jiongyuan AU - Wang J AD - Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China. FAU - Rong, Tao AU - Rong T AD - First Affiliated Hospital, Anhui University of Science and Technology, Huainan, China. FAU - Hou, Yingyong AU - Hou Y AD - Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China. FAU - Zhou, Yuhong AU - Zhou Y AD - Department of Medical Oncology, Zhongshan Hospital, Fudan University, Shanghai, China. FAU - Lu, Weiqi AU - Lu W AD - Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China. FAU - Hong, Liang AU - Hong L AD - Department of General Surgery, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China. FAU - Ma, Lijie AU - Ma L AD - Department of General Surgery, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China. AD - Department of Liver Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China. FAU - Zhang, Yong AU - Zhang Y AD - Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China. FAU - Tong, Hanxing AU - Tong H AD - Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20230706 PL - Switzerland TA - Front Immunol JT - Frontiers in immunology JID - 101560960 RN - 0 (Fatty Acids) RN - Retroperitoneal liposarcoma SB - IM MH - Humans MH - *Retroperitoneal Neoplasms/genetics MH - Ecosystem MH - Lipid Metabolism MH - Prognosis MH - Fatty Acids PMC - PMC10359070 OTO - NOTNLM OT - ELOVL2 OT - TCGA OT - immune landscape OT - lipid metabolism OT - retroperitoneal liposarcoma COIS- The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. EDAT- 2023/07/24 06:42 MHDA- 2023/07/25 06:43 PMCR- 2023/01/01 CRDT- 2023/07/24 04:32 PHST- 2023/04/20 00:00 [received] PHST- 2023/06/20 00:00 [accepted] PHST- 2023/07/25 06:43 [medline] PHST- 2023/07/24 06:42 [pubmed] PHST- 2023/07/24 04:32 [entrez] PHST- 2023/01/01 00:00 [pmc-release] AID - 10.3389/fimmu.2023.1209396 [doi] PST - epublish SO - Front Immunol. 2023 Jul 6;14:1209396. doi: 10.3389/fimmu.2023.1209396. eCollection 2023.