Type 2-like Polarization and Elevated CXCL4 Secretion of Monocyte Derived Macrophages Upon Internalization of Plasma-derived Exosomes from Head and Neck Cancer Patients

Overview

Journal BMC Cancer

Publisher Biomed Central

Specialty Oncology

Date 2024 Sep 20

PMID 39304856

Authors

Marie-Nicole Theodoraki

Diana Huber

Linda Hofmann

Lotte Werner

Christian Idel

Jonas Fleckner

Kirstin Plotze-Martin

Lutz Schutt

Cornelia Brunner

Reinhard Depping

Thomas K Hoffmann

Karl-Ludwig Bruchhage

Ralph Pries

Affiliations

Soon will be listed here.

Abstract

Background: Exosomes are closely associated with different aspects of tumor-progression in patients with head and neck squamous cell carcinoma (HNSCC), such as angiogenesis or immune regulation. As extracellular vesicles they are involved in the intercellular communication by transferring their cargo such as proteins and nucleic acids from one cell to another. However, the influence of tumor related plasma-derived exosomes on the polarization and characteristics of monocyte derived macrophages is not fully understood.

Methods: Exosomes were isolated from plasma samples of healthy donors (HD) and HNSCC patients and further evaluated with regard to morphology, size and protein composition via transmission electron microscopy, nanoparticle tracking, western blot analysis and cytokine assays. Differentiation and characteristics of monocyte derived macrophages upon exosome internalization were analyzed using flow cytometry and fluorescence microscopy. Macrophage cytokine secretion patterns were analyzed by human cytokine antibody arrays and ELISA measurements.

Results: Our data revealed elevated overall plasma levels of CTLA-4, PD-L1, and TIM-3 as well as elevated exosome-associated CTLA-4, PD-L2, TIM-3, and LAG-3 levels in HNSCC patients compared to HD. Furthermore, we observed a significant type 2-like polarization and elevated CXCL4 secretion of monocyte derived macrophages upon internalization of plasma-derived exosomes from HNSCC patients, which could be visualized by fluorescence microcopy of membrane stained exosomes.

Conclusions: The study provides new insights regarding exosome driven pro-tumorigenic immune regulation in the circulation of patients with head and neck cancer and could help to better understand the individual immunologic situation.

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