Metabolic survival adaptations of Plasmodium falciparum exposed to sub-lethal doses of fosmidomycin
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ABSTRACT:
PROVIDER: PRJNA670026 | ENA |
REPOSITORIES: ENA
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Project description:The malaria parasite Plasmodium falciparum contains the apicoplast organelle that synthesize isoprenoids, which are metabolites necessary for post-translational modification of Plasmodium proteins. We used fosmidomycin, an antibiotic that inhibits isoprenoid biosynthesis, to identify mechanisms that underlie the development of the parasite’s adaptation to the drug at sub-lethal concentrations. We first determined a concentration of fosmidomycin that reduced parasite growth by ~50% over one intraerythrocytic developmental cycle (IDC). At this dose, we maintained synchronous parasite cultures for one full IDC, and collected metabolomic and transcriptomic data at multiple time points to capture global and stage-specific alterations. We integrated the data with a genome-scale metabolic model of P. falciparum to characterize the metabolic adaptations of the parasite in response to fosmidomycin treatment. Our simulations showed that, in treated parasites, the synthesis of purine-based nucleotides increased, whereas the synthesis of phosphatidylcholine during the trophozoite and schizont stages decreased. Specifically, the increased polyamine synthesis led to increased nucleotide synthesis, while the reduced methyl-group cycling led to reduced phospholipid synthesis and methyltransferase activities. These results indicate that fosmidomycin-treated parasites compensate for the loss of prenylation modifications by directly altering processes that affect nucleotide synthesis and ribosomal biogenesis to control the rate of RNA translation during the IDC. This also suggests that combination therapies with antibiotics that target the compensatory response of the parasite, such as nucleotide synthesis or ribosomal biogenesis, may be more effective than treating the parasite with fosmidomycin alone.
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Project description:In this project we investigated the effect of sub lethal doses of the novel antibiotic 3-bromo-PP on the proteome of S. aureus Mu50.
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Project description:Transcriptional profiling of SMMC-7721 cells comparing control untreated with sub-lethal heat treated cells (50°C for 10 min). Differentially expressed lncRNA and mRNA were measured with an Agilent Human lncRNA+mRNA Array V4.0 (4 × 180 K format) containing 41,000 lncRNAs and 34,000 mRNAs. Goal was to determine the effects of sub-lethal heat treatment on global hepatoma carcinoma cells gene expression.
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Project description:Schistosoma mansoni is one of the most common etiological agents responsible for the disease schistosomiasis. More than 200 million people suffer from this disease making it the most severe tropical disease after malaria in terms of morbidity. Praziquantel (PZQ) is the treatment of choice for schistosomiasis and has been used almost exclusively to treat the disease since the 1970s. However, while the drug is lethal for sexually mature schistosomes, it is ineffective against juveniles. Thus, while morbidity can be eased, a cure is difficult to achieve. As a result there is an urgent need to develop a new generation of anti-schistosomal drugs, a task that will be made easier by understanding the mechanism of action of PZQ. As yet, neither the molecule to which PZQ binds nor the means by which it kills mature schistosomes is known. The overarching aim of this study was to understand the molecular basis of PZQ sensitivity in S. mansoni. We believe that juvenile worms survive PZQ treatment in vivo due to the induction of, as yet, unidentified protective molecular pathways. To address this hypothesis juvenile and adult PR1 S. mansoni were treated in vitro with sub-lethal concentrations of PZQ. mRNA was extracted from replicate samples, cRNA prepagreen and labeled with cyanine dyes for analysis using a 44K S. mansoni microarray. The data was then analyzed using Genespring. Our findings suggest that a number of genes associated with drug transport, iron homeostasis and apoptosis are induced in juvenile but not adult schistosomes and that this allows the juvenile worms to protect themselves against the lethal effects of PZQ long enough for the drug to be metabolized by the human host.
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Project description:In order to examine the long term effects of the OPs, murine liver cells (BNL CL.2, ATCC® TIB-73) have been exposed to sub-lethal doses of three OPs: diisopropylfluorophosphate (DFP) representative of sarin and soman, O,S-diethyl methylphosphonothioate (OSD) serving as a simulant for VX, and paraoxon as an example of OP insecticides. Dosing levels of these compounds was set at 20% of the IV LD50 for each, with a 4 hour exposure time. Gene arrays and physiological tests were run at three time points following exposure; 2 hours, 2 days, and 2 weeks. The physiological results showed little to no effect upon exposure to sub-lethal dose of OPs. Gene expression and microRNA (miRNA) profiles using GeneChip Mouse Gene 1.0 ST arrays and miRNA arrays (Affymetrix, Santa Clara, CA) found that the OPs did alter expression of genes related to several systems previously implicated in OP exposure with no long term effects. In addition, a significant number of sRNA/snRNA and ribosomal RNA were found to be affected suggesting the need for further study of the changes in these regulators.
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Project description:In order to examine the long term effects of the OPs, murine liver cells (BNL CL.2, ATCC® TIB-73) have been exposed to sub-lethal doses of three OPs: diisopropylfluorophosphate (DFP) representative of sarin and soman, O,S-diethyl methylphosphonothioate (OSD) serving as a simulant for VX, and paraoxon as an example of OP insecticides. Dosing levels of these compounds was set at 20% of the IV LD50 for each, with a 4 hour exposure time. Gene arrays and physiological tests were run at three time points following exposure; 2 hours, 2 days, and 2 weeks. The physiological results showed little to no effect upon exposure to sub-lethal dose of OPs. Gene expression and microRNA (miRNA) profiles using GeneChip Mouse Gene 1.0 ST arrays and miRNA arrays (Affymetrix, Santa Clara, CA) found that the OPs did alter expression of genes related to several systems previously implicated in OP exposure with no long term effects. In addition, a significant number of sRNA/snRNA and ribosomal RNA were found to be affected suggesting the need for further study of the changes in these regulators.
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Project description:To see the effect of sub-lethal concentration of tobramcyin on PAO1 under anaerobic conditions. RNA was isolated from 5 biological repeats of PAO1 grown to mid-log phase in cationic adjusted mueller hinton broth containing 15mM KNO3 and 5 biological repeats of PAO1 grown to mid-log phase in cationic adjusted mueller hinton broth containing 15mM KNO3 and then treated for 30 minutes with 2 ug/ml tobramycin. All flasks were sealed to create anaerobic conditions. null
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