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Reiling SJ, Krohne G, Friedrich O, Geary TG, Rohrbach P. Chloroquine exposure triggers distinct cellular responses in sensitive versus resistant Plasmodium falciparum parasites. Sci Rep 2018; 8:11137. [PMID: 30042399 PMCID: PMC6057915 DOI: 10.1038/s41598-018-29422-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/06/2018] [Indexed: 11/25/2022] Open
Abstract
Chloroquine (CQ) treatment failure in Plasmodium falciparum parasites has been documented for decades, but the pharmacological explanation of this phenotype is not fully understood. Current concepts attribute CQ resistance to reduced accumulation of the drug at a given external CQ concentration ([CQ]ex) in resistant compared to sensitive parasites. The implication of this explanation is that the mechanisms of CQ-induced toxicity in resistant and sensitive strains are similar once lethal internal concentrations have been reached. To test this hypothesis, we investigated the mechanism of CQ-induced toxicity in CQ-sensitive (CQS) versus CQ-resistant (CQR) parasites by analyzing the time-course of cellular responses in these strains after exposure to varying [CQ]ex as determined in 72 h toxicity assays. Parasite killing was delayed in CQR parasites for up to 10 h compared to CQS parasites when exposed to equipotent [CQ]ex. In striking contrast, brief exposure (1 h) to lethal [CQ]ex in CQS but not CQR parasites caused the appearance of hitherto undescribed hemozoin (Hz)-containing compartments in the parasite cytosol. Hz-containing compartments were very rarely observed in CQR parasites even after CQ exposures sufficient to cause irreversible cell death. These findings challenge current concepts that CQ killing of malaria parasites is solely concentration-dependent, and instead suggest that CQS and CQR strains fundamentally differ in the consequences of CQ exposure.
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Affiliation(s)
- Sarah J Reiling
- Institute of Parasitology, McGill University, Ste. Anne de Bellevue (Montréal), Québec, Canada
| | - Georg Krohne
- Theodor Boveri Institute, Biocenter, University of Würzburg, Würzburg, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany
| | - Timothy G Geary
- Institute of Parasitology, McGill University, Ste. Anne de Bellevue (Montréal), Québec, Canada
| | - Petra Rohrbach
- Institute of Parasitology, McGill University, Ste. Anne de Bellevue (Montréal), Québec, Canada.
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Lin JW, Spaccapelo R, Schwarzer E, Sajid M, Annoura T, Deroost K, Ravelli RBG, Aime E, Capuccini B, Mommaas-Kienhuis AM, O'Toole T, Prins F, Franke-Fayard BMD, Ramesar J, Chevalley-Maurel S, Kroeze H, Koster AJ, Tanke HJ, Crisanti A, Langhorne J, Arese P, Van den Steen PE, Janse CJ, Khan SM. Replication of Plasmodium in reticulocytes can occur without hemozoin formation, resulting in chloroquine resistance. ACTA ACUST UNITED AC 2015; 212:893-903. [PMID: 25941254 PMCID: PMC4451122 DOI: 10.1084/jem.20141731] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 04/08/2015] [Indexed: 01/03/2023]
Abstract
Lin et al. generate Plasmodium berghei mutants lacking enzymes critical to hemoglobin digestion. A double gene deletion mutant lacking enzymes involved in the initial steps of hemoglobin proteolysis is able to replicate inside reticulocytes of infected mice with limited hemoglobin degradation and no hemozoin formation, and moreover, is resistant to the antimalarial drug chloroquine. Most studies on malaria-parasite digestion of hemoglobin (Hb) have been performed using P. falciparum maintained in mature erythrocytes, in vitro. In this study, we examine Plasmodium Hb degradation in vivo in mice, using the parasite P. berghei, and show that it is possible to create mutant parasites lacking enzymes involved in the initial steps of Hb proteolysis. These mutants only complete development in reticulocytes and mature into both schizonts and gametocytes. Hb degradation is severely impaired and large amounts of undigested Hb remains in the reticulocyte cytoplasm and in vesicles in the parasite. The mutants produce little or no hemozoin (Hz), the detoxification by-product of Hb degradation. Further, they are resistant to chloroquine, an antimalarial drug that interferes with Hz formation, but their sensitivity to artesunate, also thought to be dependent on Hb degradation, is retained. Survival in reticulocytes with reduced or absent Hb digestion may imply a novel mechanism of drug resistance. These findings have implications for drug development against human-malaria parasites, such as P. vivax and P. ovale, which develop inside reticulocytes.
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Affiliation(s)
- Jing-Wen Lin
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands Division of Parasitology, MRC National Institute for Medical Research, London NW7 1AA, England, UK
| | - Roberta Spaccapelo
- Department of Experimental Medicine, University of Perugia, Piazzale Gambuli, 06132 Perugia, Italy
| | - Evelin Schwarzer
- Department of Oncology, University of Torino, 10124 Torino, Italy
| | - Mohammed Sajid
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Takeshi Annoura
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Katrien Deroost
- Laboratory of Immunobiology, Rega Institute for Medical Research, KU Leuven - University of Leuven, 3000 Leuven, Belgium
| | - Raimond B G Ravelli
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Elena Aime
- Department of Experimental Medicine, University of Perugia, Piazzale Gambuli, 06132 Perugia, Italy
| | - Barbara Capuccini
- Department of Experimental Medicine, University of Perugia, Piazzale Gambuli, 06132 Perugia, Italy Division of Parasitology, MRC National Institute for Medical Research, London NW7 1AA, England, UK
| | - Anna M Mommaas-Kienhuis
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Tom O'Toole
- Department of Molecular Cell Biology and Immunology, Vrije University Medical Center, 1007 MB Amsterdam, Netherlands
| | - Frans Prins
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Blandine M D Franke-Fayard
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Jai Ramesar
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Séverine Chevalley-Maurel
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Hans Kroeze
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Abraham J Koster
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Hans J Tanke
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Andrea Crisanti
- Department of Experimental Medicine, University of Perugia, Piazzale Gambuli, 06132 Perugia, Italy Department of Biological Sciences, Imperial College London, South Kensington Campus, SAF, London SW7 2AZ, England, UK
| | - Jean Langhorne
- Division of Parasitology, MRC National Institute for Medical Research, London NW7 1AA, England, UK
| | - Paolo Arese
- Department of Oncology, University of Torino, 10124 Torino, Italy
| | - Philippe E Van den Steen
- Laboratory of Immunobiology, Rega Institute for Medical Research, KU Leuven - University of Leuven, 3000 Leuven, Belgium
| | - Chris J Janse
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
| | - Shahid M Khan
- Leiden Malaria Research Group, Department of Parasitology, Department of Molecular Cell Biology, and Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, Netherlands
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Hoppe HC, van Schalkwyk DA, Wiehart UIM, Meredith SA, Egan J, Weber BW. Antimalarial quinolines and artemisinin inhibit endocytosis in Plasmodium falciparum. Antimicrob Agents Chemother 2004; 48:2370-8. [PMID: 15215083 PMCID: PMC434207 DOI: 10.1128/aac.48.7.2370-2378.2004] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Endocytosis is a fundamental process of eukaryotic cells and fulfills numerous functions, most notably, that of macromolecular nutrient uptake. Malaria parasites invade red blood cells and during their intracellular development endocytose large amounts of host cytoplasm for digestion in a specialized lysosomal compartment, the food vacuole. In the present study we have examined the effects of artemisinin and the quinoline drugs chloroquine and mefloquine on endocytosis in Plasmodium falciparum. By using novel assays we found that mefloquine and artemisinin inhibit endocytosis of macromolecular tracers by up to 85%, while the latter drug also leads to an accumulation of undigested hemoglobin in the parasite. During 5-h incubations, chloroquine inhibited hemoglobin digestion but had no other significant effect on the endocytic pathway of the parasite, as assessed by electron microscopy, the immunofluorescence localization of hemoglobin, and the distribution of fluorescent and biotinylated dextran tracers. By contrast, when chloroquine was added to late ring stage parasites, followed by a 12-h incubation, macromolecule endocytosis was inhibited by more than 40%. Moreover, there is an accumulation of transport vesicles in the parasite cytosol, possibly due to a disruption in vacuole-vesicle fusion. This fusion block is not observed with mefloquine, artemisinin, quinine, or primaquine but is mimicked by the vacuole alkalinizing agents ammonium chloride and monensin. These results are discussed in the light of present theories regarding the mechanisms of action of the antimalarials and highlight the potential use of drugs in manipulating and studying the endocytic pathway of malaria parasites.
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Affiliation(s)
- Heinrich C Hoppe
- Division of Pharmacology, University of Cape Town Medical School, Groote Schuur Hospital Old Building, Observatory, Cape Town 7925, South Africa.
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Fitch CD. Ferriprotoporphyrin IX, phospholipids, and the antimalarial actions of quinoline drugs. Life Sci 2004; 74:1957-72. [PMID: 14967191 DOI: 10.1016/j.lfs.2003.10.003] [Citation(s) in RCA: 145] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2003] [Accepted: 10/04/2003] [Indexed: 11/23/2022]
Abstract
Two subclasses of quinoline antimalarial drugs are used clinically. Both act on the endolysosomal system of malaria parasites, but in different ways. Treatment with 4-aminoquinoline drugs, such as chloroquine, causes morphologic changes and hemoglobin accumulation in endocytic vesicles. Treatment with quinoline-4-methanol drugs, such as quinine and mefloquine, also causes morphologic changes, but does not cause hemoglobin accumulation. In addition, chloroquine causes undimerized ferriprotoporphyrin IX (ferric heme) to accumulate whereas quinine and mefloquine do not. On the contrary, treatment with quinine or mefloquine prevents and reverses chloroquine-induced accumulation of hemoglobin and undimerized ferriprotoporphyrin IX. This difference is of particular interest since there is convincing evidence that undimerized ferriprotoporphyrin IX in malaria parasites would interact with and serve as a target for chloroquine. According to the ferriprotoporphyrin IX interaction hypothesis, chloroquine would bind to undimerized ferriprotoporphyrin IX, delay its detoxification, cause it to accumulate, and allow it to exert its intrinsic biological toxicities. The ferriprotoporphyrin IX interaction hypothesis appears to explain the antimalarial action of chloroquine, but a drug target in addition to ferriprotoporphyrin IX is suggested by the antimalarial actions of quinine and mefloquine. This article summarizes current knowledge of the role of ferriprotoporphyrin IX in the antimalarial actions of quinoline drugs and evaluates the currently available evidence in support of phospholipids as a second target for quinine, mefloquine and, possibly, the chloroquine-ferriprotoporphyrin IX complex.
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Affiliation(s)
- Coy D Fitch
- Department of Internal Medicine, School of Medicine, Saint Louis University Health Sciences Center, 1402 South Grand Boulevard, St. Louis, MO 63104, USA.
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