Analysis of Ca 2 + mediated signaling regulating Toxoplasma infectivity reveals complex relationships between key molecules
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 Ca signaling although the temporal dynamics of Ca fluxes and down-stream second messenger pathway...
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| Published in | Cellular microbiology Vol. 19; no. 4 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
01.04.2017
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| Subjects | |
| Online Access | Get full text |
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| Abstract | 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 Ca
signaling although the temporal dynamics of Ca
fluxes and down-stream second messenger pathways are poorly understood. Here, we use a genetically encoded biosensor, GFP-Calmodulin-M13-6 (GCaMP6), to capture Ca
flux in live Toxoplasma and investigate the role of Ca
signaling in egress and motility. Our analysis determines how environmental cues and signal activation influence intracellular Ca
flux, allowing placement of effector molecules within this pathway. Importantly, we have identified key interrelationships between cGMP and Ca
signaling that are required for activation of egress and motility. Furthermore, we extend this analysis to show that the Ca
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. |
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| AbstractList | 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 Ca
signaling although the temporal dynamics of Ca
fluxes and down-stream second messenger pathways are poorly understood. Here, we use a genetically encoded biosensor, GFP-Calmodulin-M13-6 (GCaMP6), to capture Ca
flux in live Toxoplasma and investigate the role of Ca
signaling in egress and motility. Our analysis determines how environmental cues and signal activation influence intracellular Ca
flux, allowing placement of effector molecules within this pathway. Importantly, we have identified key interrelationships between cGMP and Ca
signaling that are required for activation of egress and motility. Furthermore, we extend this analysis to show that the Ca
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. |
| Author | Tonkin, Christopher J Whitehead, Lachlan Lessene, Guillaume Nijagal, Brunda Rogers, Kelly L Stewart, Rebecca J Sleebs, Brad E McConville, Malcolm J |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/27781359$$D View this record in MEDLINE/PubMed |
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| SubjectTerms | Calcium Signaling Cells, Cultured Cyclic GMP - metabolism Cyclic GMP-Dependent Protein Kinases - metabolism Host-Parasite Interactions Humans Toxoplasma - pathogenicity Toxoplasma - physiology Toxoplasmosis - parasitology |
| Title | Analysis of Ca 2 + mediated signaling regulating Toxoplasma infectivity reveals complex relationships between key molecules |
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