Analysis of Ca2+ mediated signaling regulating Toxoplasma infectivity reveals complex relationships between key molecules
Publication Year 2017-10-26, Volume 19, Issue #4, Page e12685
Journal Title
Cellular Microbiology
Publication Type
Journal Article
Host cell invasion, exit and parasite dissemination is critical to the pathogenesis of apicomplexan parasites such as Toxoplasma gondii and Plasmodium spp. These processes are regulated by intracellular Ca2+ signaling although the temporal dynamics of Ca2+ fluxes and down-stream second messenger pathways are poorly understood. Here, we use a genetically encoded biosensor, GFP-Calmodulin-M13-6 (GCaMP6), to capture Ca2+ flux in live Toxoplasma and investigate the role of Ca2+ signaling in egress and motility. Our analysis determines how environmental cues and signal activation influence intracellular Ca2+ flux, allowing placement of effector molecules within this pathway. Importantly, we have identified key interrelationships between cGMP and Ca2+ signaling that are required for activation of egress and motility. Furthermore, we extend this analysis to show that the Ca2+ Dependent Protein Kinases-TgCDPK1 and TgCDPK3-play a role in signal quenching before egress. This work highlights the interrelationships of second messenger pathways of Toxoplasma in space and time, which is likely required for pathogenesis of all apicomplexan species.
WEHI Research Division(s)
Infection And Immunity; Systems Biology And Personalised Medicine; Chemical Biology
PubMed ID
Publisher's Version
NHMRC Grants
NHMRC/1022559 NHMRC/1047806 NHMRC/1017059
Rights Notice
Refer to copyright notice on published article.

Creation Date: 2017-11-16 12:07:55
Last Modified: 2017-11-16 12:11:08
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