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Updated: Jun 4, 2025
Evaluation of Extracellular Vesicle Function During Malaria Infection
Published on: February 14, 2018
Evaluation of Exosomal Proteins as Potential Biomarkers from RBC Stages of Plasmodium falciparum 3D7
Urja Joshi1,2, Sumedha Shah3, Sharad Gupta3
1Department of Biochemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat 380009, India.
Abstract:
Falciparum malaria relies extensively on cell-to-cell communication, and earlier research on the function of exosomal proteins derived from infected red blood cells (iRBCs) has been classified into numerous important roles. In this study, the exosomes were derived from Pf3D7-iRBCs cultured in vitro during synchronized trophozoite stages. The isolated exosomes were assessed using NTA, FE-SEM, and flow cytometry. Our study reported heterogeneous populations of exosomes during the infection. Additionally, label-free quantification based on LC/MS-MS for protein profiling revealed the presence of both parasitic and host (RBC) proteins; out of a total of 124 proteins detected, 20 Pf3D7 proteins and 80 RBC proteins were identified. Exosomal RBC protein expression is different in cRBCs-Exo and iRBCs-Exo, which shows how the parasite and RBCs interact with each other. Functional classification reported that the majority of these Pf3D7 proteins are uncharacterized with unknown functions, few of which are involved in biological processes such as regulation of complement activation, response to external stimuli, immune system-mediated signaling pathway, protein processing, etc. Hence, studying these exosomal proteins and comparing them to previous research has helped us understand how exosomes help cells to communicate in malaria. It may also reveal new potential biomarkers for diagnostic methods or therapies for malaria.
Insights
This study reveals that exosomes from malaria-infected red blood cells (iRBCs) contain diverse parasite and host proteins. Understanding these exosomal proteins offers insights into malaria cell communication and potential diagnostic biomarkers.
Area of Science:
- Parasitology
- Cell Biology
- Biochemistry
Background:
- Malaria parasite Plasmodium falciparum extensively utilizes cell-to-cell communication.
- Exosomes derived from infected red blood cells (iRBCs) play crucial roles in malaria pathogenesis.
- Previous research has identified various functions for exosomal proteins in malaria.
Purpose of the Study:
- To characterize exosomes derived from Plasmodium falciparum-infected RBCs (Pf3D7-iRBCs) in vitro.
- To identify and profile proteins within these exosomes using advanced techniques.
- To investigate the functional implications of identified exosomal proteins in malaria.
Main Methods:
- Isolation of exosomes from synchronized Pf3D7-iRBCs cultured in vitro.
- Characterization of exosome populations using Nanoparticle Tracking Analysis (NTA), Field Emission Scanning Electron Microscopy (FE-SEM), and flow cytometry.
- Label-free quantitative proteomics using Liquid Chromatography-Tandem Mass Spectrometry (LC/MS-MS) for protein identification.
Main Results:
- Heterogeneous exosome populations were observed during infection.
- Proteomic analysis identified 124 proteins, including 20 Plasmodium falciparum (Pf3D7) proteins and 80 host (RBC) proteins.
- Differential expression of RBC proteins in exosomes from infected vs. control RBCs suggests parasite-host interaction.
Conclusions:
- The study provides a comprehensive protein profile of exosomes derived from Pf3D7-iRBCs.
- Many identified Plasmodium falciparum proteins within exosomes remain uncharacterized, highlighting a gap in knowledge.
- Exosomal proteins involved in immune responses and protein processing may offer insights into malaria pathogenesis and potential diagnostic or therapeutic targets.
