Preliminary investigation of extracellular vesicles in mammary cancer of dogs and cats: Identification and characterization

Veterinary and Comparative Oncology
A SammarcoV Zappulli

Abstract

Extracellular vesicles (EVs) are membrane-bound vesicles produced by cells, known to play a key role in cell-to-cell communication. They exert pleiotropic biological functions via the horizontal transfer of bioactive molecules (DNA, RNAs, proteins, and lipids) within the tumour microenvironment and throughout the body. In human cancer, EVs are known to interfere with pathways that lead to tumour progression and are used as novel cancer biomarkers. In veterinary medicine, very little is known on cancer-derived EVs. In this study, we preliminarily characterized EVs in mammary gland cancer of dogs and cats. EVs were isolated by ultracentrifugation from canine (CYPp), feline (FMCp) and human (MCF7) mammary tumour cell lines. EVs were visualized by transmission electron microscopy (TEM), counted using nanoparticle tracking analysis (NTA) and characterized by immunogold (CD63 and Alix) and western blot (Alix and TSG101). Additionally, EV production by "donor" cells (palmtdTomato+ ) and uptake by "recipient" cells (GFP+ ) were assessed. EVs were successfully isolated from all 3 cell lines by ultracentrifugation. Membrane-bound structures (50-400 nm) were identified by TEM and were positive for both CD63 and Alix at immunogold. Western...Continue Reading

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