» Articles » PMID: 38791876

Exploring the Immunomodulatory Potential of Pancreatic Cancer-Derived Extracellular Vesicles Through Proteomic and Functional Analyses

Abstract

Pancreatic cancer (PC) has a poor prognosis and displays resistance to immunotherapy. A better understanding of tumor-derived extracellular vesicle (EV) effects on immune responses might contribute to improved immunotherapy. EVs derived from Capan-2 and BxPC-3 PC cells isolated by ultracentrifugation were characterized by atomic force microscopy, Western blot (WB), nanoparticle tracking analysis, and label-free proteomics. Fresh PBMCs from healthy donors were treated with PC- or control-derived heterologous EVs, followed by flow cytometry analysis of CD8+ and CD4+ lymphocytes. The proteomics of lymphocytes sorted from EV-treated or untreated PBMCs was performed, and the IFN-γ concentration was measured by ELISA. Notably, most of the proteins identified in Capan-2 and BxPC-3 EVs by the proteomic analysis were connected in a single functional network ( = 1 × 10) and were involved in the "Immune System" (FDR: 1.10 × 10 and 3.69 × 10, respectively). Interestingly, the treatment of healthy donor-derived PBMCs with Capan-2 EVs but not with BxPC-3 EVs or heterologous control EVs induced early activation of CD8+ and CD4+ lymphocytes. The proteomics of lymphocytes sorted from EV-treated PBMCs was consistent with their activation by Capan-2 EVs, indicating IFN-γ among the major upstream regulators, as confirmed by ELISA. The proteomic and functional analyses indicate that PC-EVs have pleiotropic effects, and some may activate early immune responses, which might be relevant for the development of highly needed immunotherapeutic strategies in this immune-cold tumor.

References
1.
Brocco D, De Bellis D, Marino P, Simeone P, Grassadonia A, De Tursi M . High Blood Concentration of Leukocyte-Derived Extracellular Vesicles Is Predictive of Favorable Clinical Outcomes in Patients with Pancreatic Cancer: Results from a Multicenter Prospective Study. Cancers (Basel). 2022; 14(19). PMC: 9562679. DOI: 10.3390/cancers14194748. View

2.
Mulcahy L, Pink R, Carter D . Routes and mechanisms of extracellular vesicle uptake. J Extracell Vesicles. 2014; 3. PMC: 4122821. DOI: 10.3402/jev.v3.24641. View

3.
Ma F, Vayalil J, Lee G, Wang Y, Peng G . Emerging role of tumor-derived extracellular vesicles in T cell suppression and dysfunction in the tumor microenvironment. J Immunother Cancer. 2021; 9(10). PMC: 8513270. DOI: 10.1136/jitc-2021-003217. View

4.
Veschi S, De Lellis L, Florio R, Lanuti P, Massucci A, Tinari N . Effects of repurposed drug candidates nitroxoline and nelfinavir as single agents or in combination with erlotinib in pancreatic cancer cells. J Exp Clin Cancer Res. 2018; 37(1):236. PMC: 6151049. DOI: 10.1186/s13046-018-0904-2. View

5.
Tang D, Chen M, Huang X, Zhang G, Zeng L, Zhang G . SRplot: A free online platform for data visualization and graphing. PLoS One. 2023; 18(11):e0294236. PMC: 10635526. DOI: 10.1371/journal.pone.0294236. View