南方医科大学学报 ›› 2026, Vol. 46 ›› Issue (8): 1915-1925.doi: 10.12122/j.issn.1673-4254.2026.08.19
• • 上一篇
黄炳轶1,2,3(
), 高玉洁1,2,3, 谢靖宜1,2,3, 严晨2,3, 顾梦茹2,3, 张志郅2,3, 郭锦涛1,2,3, 刘嵩1,2,3, 王子良1,2,3, 杨玉萍4, 左芦根1,2, 陈德利1,2(
)
收稿日期:2025-12-08
出版日期:2026-08-20
发布日期:2026-08-01
通讯作者:
陈德利
E-mail:huangbingyi1005@163.com;13965295950@139.com
作者简介:黄炳轶,在读硕士研究生,E-mail: huangbingyi1005@163.com
基金资助:
Bingyi HUANG1,2,3(
), Yujie GAO1,2,3, Jingyi XIE1,2,3, Chen YAN2,3, Mengru GU2,3, Zhizhi ZHANG2,3, Jintao GUO1,2,3, Song LIU1,2,3, Ziliang WANG1,2,3, Yuping YANG4, Lugen ZUO1,2, Deli CHEN1,2(
)
Received:2025-12-08
Online:2026-08-20
Published:2026-08-01
Contact:
Deli CHEN
E-mail:huangbingyi1005@163.com;13965295950@139.com
摘要:
目的 探讨棕榈酰蛋白硫酯酶1(PPT1)在胃癌组织中的表达规律及其与患者临床预后的关系,并阐明其调控癌细胞脂质代谢的分子机制。 方法 联合TCGA-STAD数据库与临床样本免疫组化染色,分析PPT1在胃癌组织及癌旁组织中的表达差异。回顾性纳入136例接受根治性切除的胃癌患者,提取其病理与随访参数,运用Kaplan-Meier法、单因素及多因素Cox回归模型分析PPT1表达与术后5年生存率的关联,据此建立生存预测列线图并使用ROC曲线评估其效能。此外,结合GO及REACTOME数据库进行生物学通路富集。体外水平上,通过慢病毒转染构建胃癌细胞系模型,利用CCK-8法及Transwell小室法分别检测细胞增殖、迁移和侵袭能力。采用油红O染色、Western blotting实验以及抑制剂U0126逆转实验,探讨PPT1介导ERK信号通路对脂质代谢的调控作用。 结果 PPT1蛋白定位于细胞质,其在胃癌组织中的表达水平显著高于癌旁正常组织。PPT1高表达与患者外周血CEA、CA19-9水平的上升以及较高的T、N分期密切相关(P<0.05)。生存分析及Cox回归提示,PPT1高表达是导致患者术后5年生存率下降的独立危险因素。基于该指标构建的列线图显示出良好的预测准确度(C-index=0.812),其对应的ROC曲线AUC值为0.837。体外实验证实,下调PPT1表达可显著抑制胃癌细胞的增殖及侵袭转移能力,而过表达PPT1则起到反向的促进作用(P<0.05)。机制方面,过表达PPT1不仅诱导了细胞内脂质的异常蓄积,还显著上调了SREBP-1及FASN等脂质合成关键蛋白的表达(P<0.05)。该促脂质生成效应及其伴随的ERK通路激活,均可被U0126有效逆转。 结论 胃癌组织中PPT1呈显著的高表达状态且提示患者预后不良。PPT1可能通过激活ERK信号通路影响胃癌细胞脂质代谢,从而助推肿瘤的恶性进展。PPT1有望作为胃癌的新型预后生物标志物与潜在干预靶点。
黄炳轶, 高玉洁, 谢靖宜, 严晨, 顾梦茹, 张志郅, 郭锦涛, 刘嵩, 王子良, 杨玉萍, 左芦根, 陈德利. PPT1在胃癌中的预后价值及其对癌细胞脂质代谢的作用和机制[J]. 南方医科大学学报, 2026, 46(8): 1915-1925.
Bingyi HUANG, Yujie GAO, Jingyi XIE, Chen YAN, Mengru GU, Zhizhi ZHANG, Jintao GUO, Song LIU, Ziliang WANG, Yuping YANG, Lugen ZUO, Deli CHEN. Prognostic value of palmitoyl-protein thioesterase-1 in gastric cancer and its regulatory role in tumor cell lipid metabolism[J]. Journal of Southern Medical University, 2026, 46(8): 1915-1925.
图1 PPT1在胃癌组织高表达
Fig.1 Palmitoyl-protein thioesterase-1 (PPT1) is highly expressed in gastric carcinoma (GC) tissues. A: Expression of PPT1 in human malignant tumors. B, C: Differential expression of PPT1 mRNA between gastric adenocarcinoma tissues and normal adjacent tissues (based on the TCGA-STAD cohort). D, E: Immunohistochemical (IHC) analysis of PPT1 in paired gastric carcinoma and adjacent normal tissues (n=136). *P<0.05, **P<0.01, ***P<0.001.
| Factor | n | PPT1 expression [(n (%)] | χ2 | P | |
|---|---|---|---|---|---|
| Low (n=68) | High (n=68) | ||||
| Gender | |||||
| Male | 80 | 43 (53.8%) | 37 (46.2%) | 1.093 | 0.296 |
| Female | 56 | 25 (44.6%) | 31 (55.4%) | ||
| Age (year) | |||||
| <60 | 45 | 22 (48.9%) | 23 (51.1%) | 0.033 | 0.855 |
| ≥60 | 91 | 46 (50.5%) | 45 (49.5%) | ||
| CEA (μg/L) | |||||
| <5 | 59 | 41 (69.5%) | 18 (30.5%) | 15.836 | <0.001 |
| ≥5 | 77 | 27 (35.1%) | 50 (64.9%) | ||
| CA19-9 (kU/L) | |||||
| <37 | 50 | 35 (70.0%) | 15 (30.0%) | 12.651 | <0.001 |
| ≥37 | 86 | 33 (38.4%) | 53 (61.6%) | ||
| Histological type | |||||
| Adenocarcinoma | 99 | 52 (52.5%) | 47 (47.5%) | 0.928 | 0.335 |
| Other | 37 | 16 (43.2%) | 21 (56.8%) | ||
| Pathological grading | |||||
| G1-G2 | 48 | 25 (52.1%) | 23 (47.9%) | 0.129 | 0.720 |
| G3-G4 | 88 | 43 (48.9%) | 45 (51.1%) | ||
| Tumor size (cm) | |||||
| <5 | 57 | 30 (52.6%) | 27 (47.4%) | 0.272 | 0.602 |
| ≥5 | 79 | 38 (48.1%) | 41 (51.9%) | ||
| T stage | |||||
| T1-T2 | 61 | 42 (68.9%) | 19 (31.1%) | 15.725 | <0.001 |
| T3-T4 | 75 | 26 (34.7%) | 49 (65.3%) | ||
| N stage | |||||
| N0-N1 | 63 | 41 (65.1%) | 22 (34.9%) | 10.675 | 0.001 |
| N2-N3 | 73 | 27 (37.0%) | 46 (63.0%) | ||
表1 PPT1表达水平与胃癌临床病理参数的相关性分析
Tab.1 Correlation between PPT1 expression levels and clinico-pathological parameters in gastric cancer
| Factor | n | PPT1 expression [(n (%)] | χ2 | P | |
|---|---|---|---|---|---|
| Low (n=68) | High (n=68) | ||||
| Gender | |||||
| Male | 80 | 43 (53.8%) | 37 (46.2%) | 1.093 | 0.296 |
| Female | 56 | 25 (44.6%) | 31 (55.4%) | ||
| Age (year) | |||||
| <60 | 45 | 22 (48.9%) | 23 (51.1%) | 0.033 | 0.855 |
| ≥60 | 91 | 46 (50.5%) | 45 (49.5%) | ||
| CEA (μg/L) | |||||
| <5 | 59 | 41 (69.5%) | 18 (30.5%) | 15.836 | <0.001 |
| ≥5 | 77 | 27 (35.1%) | 50 (64.9%) | ||
| CA19-9 (kU/L) | |||||
| <37 | 50 | 35 (70.0%) | 15 (30.0%) | 12.651 | <0.001 |
| ≥37 | 86 | 33 (38.4%) | 53 (61.6%) | ||
| Histological type | |||||
| Adenocarcinoma | 99 | 52 (52.5%) | 47 (47.5%) | 0.928 | 0.335 |
| Other | 37 | 16 (43.2%) | 21 (56.8%) | ||
| Pathological grading | |||||
| G1-G2 | 48 | 25 (52.1%) | 23 (47.9%) | 0.129 | 0.720 |
| G3-G4 | 88 | 43 (48.9%) | 45 (51.1%) | ||
| Tumor size (cm) | |||||
| <5 | 57 | 30 (52.6%) | 27 (47.4%) | 0.272 | 0.602 |
| ≥5 | 79 | 38 (48.1%) | 41 (51.9%) | ||
| T stage | |||||
| T1-T2 | 61 | 42 (68.9%) | 19 (31.1%) | 15.725 | <0.001 |
| T3-T4 | 75 | 26 (34.7%) | 49 (65.3%) | ||
| N stage | |||||
| N0-N1 | 63 | 41 (65.1%) | 22 (34.9%) | 10.675 | 0.001 |
| N2-N3 | 73 | 27 (37.0%) | 46 (63.0%) | ||
图2 PPT1分布特征与胃癌根治术后5年生存期的关系
Fig.2 Association of PPT1 expression levels with 5-year survival of GC patients after radical gastrectomy. A: Progression-free survival of the patients. B: Overall survival of the patients. C: Postoperative survival of patients with high and low PPT1 expression (n=136).
图4 胃癌根治术后5年生存率预测列线图的构建与内部验证
Fig.4 Construction and internal validation of a nomogram for predicting 5-year survival in GC patients after radical gastrectomy. A: Prognostic nomogram. B: Calibration curve (n=136).
图6 PPT1的富集分析及免疫浸润相关性分析
Fig.6 Enrichment analysis of PPT1 and correlation analysis of immune infiltration. A: GO analysis of PPT1 in GC. B: REACTOME analysis of PPT1 in GC. C: Correlation analysis of PPT1 with immune cell infiltration in the TIMER database.
图7 PPT1表达水平对胃癌细胞的增殖、迁移和侵袭的影响
Fig.7 PPT1 overexpression enhances proliferation, migration, and invasion of GC cells. A, B: Proliferation curves showing that PPT1 knockdown inhibits (A) while PPT1 overexpression promotes (B) cell growth. C-H: Transwell assays demonstrating that PPT1 knockdown suppresses and its overexpression enhances cell migration and invasion. *P<0.05 vs sh-NC group/LV-NC group (n=3).
图8 PPT1表达水平对胃癌细胞脂质代谢的影响
Fig.8 Effect of PPT1 expression level on lipid metabolism in GC cells. A: Expression of PPT1 in GC tissues is positively correlated with expressions of FASN and SREBP-1 in the GEPIA database. B-D: Expressions of FASN and SREBP-1 protein in GC cells (n=3). E: Representative images of lipid droplets in GC cells from each group detected by Oil Red O staining. F, G: Statistical analysis of the area positive for Oil Red O staining (n=3). *P<0.05 vs sh-NC group/LV-NC group.
图9 PPT1表达在ERK信号通路及脂质代谢中的影响
Fig.9 Effects of PPT1 on the ERK signaling pathway and lipid metabolism in GC cells (n=3). A-C: Impact of PPT1 expression on the ERK signaling pathway. D, E: Effect of U0126 on the ERK signaling pathway and lipid metabolism-related protein expressions in GC cells. F: Representative images of lipid droplets in GC cells from each group detected by Oil Red O staining. G: Statistical analysis of the area positive for Oil Red O staining. *P<0.05.
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