Campus Units

Entomology

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

7-9-2019

Journal or Book Title

Proceedings of the National Academy of Sciences of the United States of America

Volume

116

Issue

28

First Page

14119

Last Page

14128

DOI

10.1073/pnas.1900147116

Abstract

Mosquito innate immunity is comprised of both cellular and humoral factors that provide protection from invading pathogens. Immune cells, known as hemocytes, have been intricately associated with these immune responses through direct roles in phagocytosis and immune signaling. Recent studies have implicated hemocytes as integral determinants of anti-Plasmodium immunity, yet little is known regarding the specific mechanisms by which hemocytes limit malaria parasite survival. With limited genetic tools to enable their study, we employed a chemical-based treatment widely used for macrophage depletion in mammalian systems for the first time in an invertebrate organism. Upon its application in Anopheles gambiae, we observe distinct populations of phagocytic immune cells that are significantly depleted, causing high mortality following bacterial challenge and an increased intensity of malaria parasite infection. Through these studies, we demonstrate that phagocytes are required for mosquito complement recognition of invading ookinetes, as well as the production of prophenoloxidases that limit oocyst survival. Through these experiments, we also define specific sub-types of phagocytic immune cells in An. gambiae, providing new insights beyond the morphological characteristics that traditionally define mosquito hemocyte populations. Together, this study provides the first definitive insights into the dual roles of mosquito phagocytes in limiting malaria parasite survival, and illustrates the use of clodronate liposomes as an important advancement in the study of invertebrate immunity.

Comments

This is a manuscript of an article published as Kwon, Hyeogsun, and Ryan C. Smith. "Chemical depletion of phagocytic immune cells in Anopheles gambiae reveals dual roles of mosquito hemocytes in anti-Plasmodium immunity." Proceedings of the National Academy of Sciences 116 (2019): 14119-14128. doi: 10.1073/pnas.1900147116. Posted with permission.

Copyright Owner

National Academy of Sciences

Language

en

File Format

application/pdf

Published Version

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