alexa Cell-cell Communication Between Plasmodium And Host Innate Immunity Via Exosomes
ISSN: 1745-7580

Immunome Research
Open Access

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8th Molecular Immunology and Immunogenetics Congress
March 20-21, 2017 Rome, Italy

Yifat Ofir-Birin, Xavier Sisquella, Matthew A Pimentel, Jocelyn Sietsma Penington, Anthony T Papenfuss, Ziv Porat, Tal Meningher, Dror Avni, Eli Schwartz, Andrew Bowie and Neta Regev-Rudzki
Weizmann Institute of Science, Israel
Walter and Eliza Hall Institute of Medical Research, Australia
Sheba Medical Center, Israel
University of Dublin, Ireland
Posters & Accepted Abstracts: J Immunome Res
DOI: 10.4172/1745-7580.C1.012
Abstract
Malaria kills up to a million people each year, it is caused by the protozoa of the genus Plasmodium falciparum (Pf). These vectorborn parasites cycle between mosquitoes and humans and, in both contexts, are faced with an unstable and hostile environment. To ensure survival and transmission, the malaria parasite must infect and survive in the human host and differentiate into sexual forms that are competent for transmission to mosquitoes. We found, for the first time that Pf-infected red blood cells (iRBCs) directly exchange cargo between them using nano-vesicles (exosomes). These tiny vesicles are capable of delivering protected genes to target cells. Cell-cell communication is a critically important mechanism for information exchange that promotes cell survival. How Pf parasites sense their host environment and coordinate their actions, remain one of the greatest mysteries in malaria. Moreover, our understanding in the mechanism regulate human immune response to malaria infection is poor. Here, we found that malaria-derived exosomes carry remarkable cargo providing a secure and efficient mode for signal delivery. We developed an exosome tracking assay that can measure Pf exosome uptake by different cell types. Moreover, although early life-stages of Pf-iRBC are considered immunologically inert, our initial observations showed that ring-stage derived exosomes are immunogenic. We also showed that exosomes can specifically activate and induce pro-inflammatory responses, resulting in interferon type I response. This is a new area of malaria research which may shed a light on the ability of malaria parasite to manipulate their host response.
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