Increased Apolipoprotein A1 Expression Correlates with Tumor-Associated Neutrophils and T Lymphocytes in Upper Tract Urothelial Carcinoma

• Published in: Current Issues in Molecular Biology Vol. 46; no. 3; pp. 2155 - 2165
• Main Authors: Chang, Chih-Chia, Chang, Chia-Bin, Chen, Chiung-Ju, Tung, Chun-Liang, Hung, Chi-Feng, Lai, Wei-Hong, Shen, Cheng-Huang, Tsai, Chang-Yu, Lai, Ya-Yan, Lee, Ming-Yang, Wu, Shu-Fen, Chen, Pi-Che
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.03.2024; MDPI
• Subjects: apolipoprotein A1; Apolipoproteins; Brief Report; Cancer; Carcinoma; Development and progression; Ethylenediaminetetraacetic acid; Health aspects; T cells; tumor-infiltrating neutrophils; tumor-infiltrating T lymphocytes; upper tract urothelial carcinoma; Taiwan; upper tract urothelial carcinoma; apolipoprotein A1; tumor-infiltrating neutrophils; tumor-infiltrating T lymphocytes
• ISSN: 1467-3045; 1467-3037; 1467-3045
• DOI: 10.3390/cimb46030139

An increased neutrophil-to-lymphocyte ratio (NLR) is a poor prognostic biomarker in various types of cancer, because it reflects the inhibition of lymphocytes in the circulation and tumors. In urologic cancers, upper tract urothelial carcinoma (UTUC) is known for its aggressive features and lack of T cell infiltration; however, the association between neutrophils and suppressed T lymphocytes in UTUC is largely unknown. In this study, we examined the relationship between UTUC-derived factors and tumor-associated neutrophils or T lymphocytes. The culture supernatant from UTUC tumor tissue modulated neutrophils to inhibit T cell proliferation. Among the dominant factors secreted by UTUC tumor tissue, apolipoprotein A1 (Apo-A1) exhibited a positive correlation with NLR. Moreover, tumor-infiltrating neutrophils were inversely correlated with tumor-infiltrating T cells. Elevated Apo-A1 levels in UTUC were also inversely associated with the population of tumor-infiltrating T cells. Our findings indicate that elevated Apo-A1 expression in UTUC correlates with tumor-associated neutrophils and T cells. This suggests a potential immunomodulatory effect on neutrophils and T cells within the tumor microenvironment, which may represent therapeutic targets for UTUC treatment.