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Anand A, Chandana M, Ghosh S, Das R, Singh N, Vaishalli PM, Gantasala NP, Padmanaban G, Nagaraj VA. Significance of Plasmodium berghei Amino Acid Transporter 1 in Food Vacuole Functionality and Its Association with Cerebral Pathogenesis. Microbiol Spectr 2023; 11:e0494322. [PMID: 36976018 PMCID: PMC10101031 DOI: 10.1128/spectrum.04943-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 03/07/2023] [Indexed: 03/29/2023] Open
Abstract
The food vacuole plays a central role in the blood stage of parasite development by digesting host hemoglobin acquired from red blood cells and detoxifying the host heme released during hemoglobin digestion into hemozoin. Blood-stage parasites undergo periodic schizont bursts, releasing food vacuoles containing hemozoin. Clinical studies in malaria-infected patients and in vivo animal studies have shown the association of hemozoin with disease pathogenesis and abnormal host immune responses in malaria. Here, we perform a detailed in vivo characterization of putative Plasmodium berghei amino acid transporter 1 localized in the food vacuole to understand its significance in the malaria parasite. We show that the targeted deletion of amino acid transporter 1 in Plasmodium berghei leads to a swollen food vacuole phenotype with the accumulation of host hemoglobin-derived peptides. Plasmodium berghei amino acid transporter 1-knockout parasites produce less hemozoin, and the hemozoin crystals display a thin morphology compared with wild-type parasites. The knockout parasites show reduced sensitivity to chloroquine and amodiaquine by showing recrudescence. More importantly, mice infected with the knockout parasites are protected from cerebral malaria and display reduced neuronal inflammation and cerebral complications. Genetic complementation of the knockout parasites restores the food vacuole morphology with hemozoin levels similar to that of wild-type parasites, causing cerebral malaria in the infected mice. The knockout parasites also show a significant delay in male gametocyte exflagellation. Our findings highlight the significance of amino acid transporter 1 in food vacuole functionality and its association with malaria pathogenesis and gametocyte development. IMPORTANCE Food vacuoles of the malaria parasite are involved in the degradation of red blood cell hemoglobin. The amino acids derived from hemoglobin degradation support parasite growth, and the heme released is detoxified into hemozoin. Antimalarials such as quinolines target hemozoin formation in the food vacuole. Food vacuole transporters transport hemoglobin-derived amino acids and peptides from the food vacuole to the parasite cytosol. Such transporters are also associated with drug resistance. Here, we show that the deletion of amino acid transporter 1 in Plasmodium berghei leads to swollen food vacuoles with the accumulation of hemoglobin-derived peptides. The transporter-deleted parasites generate less hemozoin with thin crystal morphology and show reduced sensitivity to quinolines. Mice infected with transporter-deleted parasites are protected from cerebral malaria. There is also a delay in male gametocyte exflagellation, affecting transmission. Our findings uncover the functional significance of amino acid transporter 1 in the life cycle of the malaria parasite.
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Affiliation(s)
- Aditya Anand
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
- Regional Centre for Biotechnology, Faridabad, Haryana, India
| | - Manjunatha Chandana
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
- School of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneswar, Odisha, India
| | - Sourav Ghosh
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
- Regional Centre for Biotechnology, Faridabad, Haryana, India
| | - Rahul Das
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
- Regional Centre for Biotechnology, Faridabad, Haryana, India
| | - Nalini Singh
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
| | - Pradeep Mini Vaishalli
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, Odisha, India
- Regional Centre for Biotechnology, Faridabad, Haryana, India
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2
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Coronado LM, Stoute JA, Nadovich CT, Cheng J, Correa R, Chaw K, González G, Zambrano M, Gittens RA, Agrawal DK, Jemison WD, Donado Morcillo CA, Spadafora C. Microwaves can kill malaria parasites non-thermally. Front Cell Infect Microbiol 2023; 13:955134. [PMID: 36816585 PMCID: PMC9932958 DOI: 10.3389/fcimb.2023.955134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 01/17/2023] [Indexed: 02/05/2023] Open
Abstract
Malaria, which infected more than 240 million people and killed around six hundred thousand only in 2021, has reclaimed territory after the SARS-CoV-2 pandemic. Together with parasite resistance and a not-yet-optimal vaccine, the need for new approaches has become critical. While earlier, limited, studies have suggested that malaria parasites are affected by electromagnetic energy, the outcomes of this affectation vary and there has not been a study that looks into the mechanism of action behind these responses. In this study, through development and implementation of custom applicators for in vitro experimentation, conditions were generated in which microwave energy (MW) killed more than 90% of the parasites, not by a thermal effect but via a MW energy-induced programmed cell death that does not seem to affect mammalian cell lines. Transmission electron microscopy points to the involvement of the haemozoin-containing food vacuole, which becomes destroyed; while several other experimental approaches demonstrate the involvement of calcium signaling pathways in the resulting effects of exposure to MW. Furthermore, parasites were protected from the effects of MW by calcium channel blockers calmodulin and phosphoinositol. The findings presented here offer a molecular insight into the elusive interactions of oscillating electromagnetic fields with P. falciparum, prove that they are not related to temperature, and present an alternative technology to combat this devastating disease.
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Affiliation(s)
- Lorena M. Coronado
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Department of Biotechnology, Acharya Nagarjuna University, Guntur, India,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama
| | - José A. Stoute
- Department of Medicine, Division of Infectious Diseases and Epidemiology, Pennsylvania State University College of Medicine, Hershey, PA, United States
| | - Christopher T. Nadovich
- Electrical and Computer Engineering, Lafayette College, Easton, PA, United States,Wallace H. Coulter School of Engineering, Clarkson University, Potsdam, NY, United States
| | - Jiping Cheng
- Department of Material Science and Engineering, Pennsylvania State University, University Park, PA, United States
| | - Ricardo Correa
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Department of Biotechnology, Acharya Nagarjuna University, Guntur, India,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama
| | - Kevin Chaw
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama,School of Technology and Engineering, Universidad Católica Santa María La Antigua, Panama City, Panama
| | - Guadalupe González
- Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama,School of Electrical Engineering, Universidad Tecnológica de Panamá, Panama City, Panama
| | - Maytee Zambrano
- Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama,School of Electrical Engineering, Universidad Tecnológica de Panamá, Panama City, Panama
| | - Rolando A. Gittens
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama
| | - Dinesh K. Agrawal
- Department of Material Science and Engineering, Pennsylvania State University, University Park, PA, United States
| | - William D. Jemison
- Wallace H. Coulter School of Engineering, Clarkson University, Potsdam, NY, United States
| | - Carlos A. Donado Morcillo
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama,School of Technology and Engineering, Universidad Católica Santa María La Antigua, Panama City, Panama
| | - Carmenza Spadafora
- Biomedical Physics and Engineering Unit, Center of Cellular and Molecular Biology of Diseases (CBCMe), Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama,Biomedical Physics and Engineering (BiomedφEngine) Group, Panama City, Panama,*Correspondence: Carmenza Spadafora,
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3
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Chandana M, Anand A, Ghosh S, Das R, Beura S, Jena S, Suryawanshi AR, Padmanaban G, Nagaraj VA. Malaria parasite heme biosynthesis promotes and griseofulvin protects against cerebral malaria in mice. Nat Commun 2022; 13:4028. [PMID: 35821013 PMCID: PMC9276668 DOI: 10.1038/s41467-022-31431-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 06/16/2022] [Indexed: 11/08/2022] Open
Abstract
Heme-biosynthetic pathway of malaria parasite is dispensable for asexual stages, but essential for mosquito and liver stages. Despite having backup mechanisms to acquire hemoglobin-heme, pathway intermediates and/or enzymes from the host, asexual parasites express heme pathway enzymes and synthesize heme. Here we show heme synthesized in asexual stages promotes cerebral pathogenesis by enhancing hemozoin formation. Hemozoin is a parasite molecule associated with inflammation, aberrant host-immune responses, disease severity and cerebral pathogenesis. The heme pathway knockout parasites synthesize less hemozoin, and mice infected with knockout parasites are protected from cerebral malaria and death due to anemia is delayed. Biosynthetic heme regulates food vacuole integrity and the food vacuoles from knockout parasites are compromised in pH, lipid unsaturation and proteins, essential for hemozoin formation. Targeting parasite heme synthesis by griseofulvin-a FDA-approved antifungal drug, prevents cerebral malaria in mice and provides an adjunct therapeutic option for cerebral and severe malaria.
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Affiliation(s)
- Manjunatha Chandana
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
- School of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneswar, 751024, Odisha, India
| | - Aditya Anand
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
- Regional Centre for Biotechnology, Faridabad, 121001, Haryana, India
| | - Sourav Ghosh
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
- Regional Centre for Biotechnology, Faridabad, 121001, Haryana, India
| | - Rahul Das
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
- Regional Centre for Biotechnology, Faridabad, 121001, Haryana, India
| | - Subhashree Beura
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
| | - Sarita Jena
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India
| | | | - Govindarajan Padmanaban
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, Karnataka, India
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In Vitro Antimalarial Activity and Phytochemical Analysis of Aerial Parts of Artemisia fragrans Willd. Jundishapur J Nat Pharm Prod 2022. [DOI: 10.5812/jjnpp.117597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Malaria is one of the most momentous transmittable diseases globally. Medicinal herbs like Artemisia species might be possible sources of new, effective, and cheap antiplasmodial products, making up the leading molecules to investigate new antimalarial drugs. The Artemisia genus, which belongs to the Asteraceae family, is a widely distributed medicinal plant in Iran. Methods: In this study, the antimalarial activities of essential oil, different extracts, and vacuum liquid chromatography (VLC) fractions of A. fragrans Willd. were examined by a cell-free β-hematin formation assay. The aerial parts of A. fragrans were extracted by a Soxhlet extractor, and essential oil was obtained by a Clevenger apparatus. Then, GC-MS analysis was used to identify volatile compounds of essential oil and the 100% VLC fraction of chloroform. Results: Among the extracts, chloroform extract illustrated considerable antimalarial activity compared to the control (P < 0.001), with the IC50 value of 1.22 ± 0.05 mg/mL. Among the fractions, 100% VLC fraction of chloroform extract illustrated potent antimalarial effects compared to the control (P < 0.001). The volatile oil demonstrated moderate antimalarial effects (P < 0.001) compared with the control. Besides, GC-MS determined that sesquiterpenes in the 100% ethyl acetate fraction of the chloroform extract and oxygenated monoterpenes in the essential oil might be responsible for the potent antimalarial activity of this plant. Conclusions: The 100% ethyl acetate fraction of chloroform extract along with the essential oil of A. fragrance indicated potent and moderate activity, possibly due to sesquiterpenes and oxygenated monoterpenes, respectively.
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5
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Edgar RCS, Counihan NA, McGowan S, de Koning-Ward TF. Methods Used to Investigate the Plasmodium falciparum Digestive Vacuole. Front Cell Infect Microbiol 2022; 11:829823. [PMID: 35096663 PMCID: PMC8794586 DOI: 10.3389/fcimb.2021.829823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/22/2021] [Indexed: 11/13/2022] Open
Abstract
Plasmodium falciparum malaria remains a global health problem as parasites continue to develop resistance to all antimalarials in use. Infection causes clinical symptoms during the intra-erythrocytic stage of the lifecycle where the parasite infects and replicates within red blood cells (RBC). During this stage, P. falciparum digests the main constituent of the RBC, hemoglobin, in a specialized acidic compartment termed the digestive vacuole (DV), a process essential for survival. Many therapeutics in use target one or multiple aspects of the DV, with chloroquine and its derivatives, as well as artemisinin, having mechanisms of action within this organelle. In order to better understand how current therapeutics and those under development target DV processes, techniques used to investigate the DV are paramount. This review outlines the involvement of the DV in therapeutics currently in use and focuses on the range of techniques that are currently utilized to study this organelle including microscopy, biochemical analysis, genetic approaches and metabolomic studies. Importantly, continued development and application of these techniques will aid in our understanding of the DV and in the development of new therapeutics or therapeutic partners for the future.
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Affiliation(s)
- Rebecca C. S. Edgar
- School of Medicine, Deakin University, Geelong, VIC, Australia
- The Institute for Mental and Physical Health and Clinical Translation, Deakin University, Geelong, VIC, Australia
| | - Natalie A. Counihan
- School of Medicine, Deakin University, Geelong, VIC, Australia
- The Institute for Mental and Physical Health and Clinical Translation, Deakin University, Geelong, VIC, Australia
| | - Sheena McGowan
- Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC, Australia
- Centre to Impact AMR, Monash University, Monash University, Clayton, VIC, Australia
| | - Tania F. de Koning-Ward
- School of Medicine, Deakin University, Geelong, VIC, Australia
- The Institute for Mental and Physical Health and Clinical Translation, Deakin University, Geelong, VIC, Australia
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6
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Chia W, Gomez-Lorenzo MG, Castellote I, Tong JX, Chandramohanadas R, Thu Chu TT, Shen W, Go ML, de Cozar C, Crespo B, Almela MJ, Neria-Serrano F, Franco V, Gamo FJ, Tan KSW. High-Content Phenotypic Screen of a Focused TCAMS Drug Library Identifies Novel Disruptors of the Malaria Parasite Calcium Dynamics. ACS Chem Biol 2021; 16:2348-2372. [PMID: 34609851 DOI: 10.1021/acschembio.1c00512] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The search for new antimalarial drugs with unexplored mechanisms of action is currently one of the main objectives to combat the resistance already in the clinic. New drugs should target specific mechanisms that once initiated lead inevitably to the parasite's death and clearance and cause minimal toxicity to the host. One such new mode of action recently characterized is to target the parasite's calcium dynamics. Disruption of the calcium homeostasis is associated with compromised digestive vacuole membrane integrity and release of its contents, leading to programmed cell death-like features characterized by loss of mitochondrial membrane potential and DNA degradation. Intriguingly, chloroquine (CQ)-treated parasites were previously reported to exhibit such cellular features. Using a high-throughput phenotypic screen, we identified 158 physiological disruptors (hits) of parasite calcium distribution from a small subset of approximately 3000 compounds selected from the GSK TCAMS (Tres Cantos Anti-Malarial Set) compound library. These compounds were then extensively profiled for biological activity against various CQ- and artemisinin-resistant Plasmodium falciparum strains and stages. The hits were also examined for cytotoxicity, speed of antimalarial activity, and their possible inhibitory effects on heme crystallization. Overall, we identified three compounds, TCMDC-136230, -125431, and -125457, which were potent in inducing calcium redistribution but minimally inhibited heme crystallization. Molecular superimposition of the molecules by computational methods identified a common pharmacophore, with the best fit assigned to TCMDC-125457. There were low cytotoxicity or CQ cross-resistance issues for these three compounds. IC50 values of these three compounds were in the low micromolar range. In addition, TCMDC-125457 demonstrated high efficacy when pulsed in a single-dose combination with artesunate against tightly synchronized artemisinin-resistant ring-stage parasites. These results should add new drug options to the current armament of antimalarial drugs as well as provide promising starting points for development of drugs with non-classical modes of action.
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Affiliation(s)
- Wanni Chia
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, and Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, S117545, Singapore
| | - Maria G. Gomez-Lorenzo
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Isabel Castellote
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Jie Xin Tong
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, and Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, S117545, Singapore
| | - Rajesh Chandramohanadas
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, and Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, S117545, Singapore
| | - Trang Thi Thu Chu
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, and Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, S117545, Singapore
| | - Wanxiang Shen
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, S117543, Singapore
| | - Mei Lin Go
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, S117543, Singapore
| | - Cristina de Cozar
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Benigno Crespo
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Maria J. Almela
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Fernando Neria-Serrano
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Virginia Franco
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Francisco-Javier Gamo
- Global Health Discovery Incubator Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Kevin S. W. Tan
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, and Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, S117545, Singapore
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7
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Asad M, Yamaryo-Botté Y, Hossain ME, Thakur V, Jain S, Datta G, Botté CY, Mohmmed A. An essential vesicular-trafficking phospholipase mediates neutral lipid synthesis and contributes to hemozoin formation in Plasmodium falciparum. BMC Biol 2021; 19:159. [PMID: 34380472 PMCID: PMC8359613 DOI: 10.1186/s12915-021-01042-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 04/30/2021] [Indexed: 11/10/2022] Open
Abstract
Background Plasmodium falciparum is the pathogen responsible for the most devastating form of human malaria. As it replicates asexually in the erythrocytes of its human host, the parasite feeds on haemoglobin uptaken from these cells. Heme, a toxic by-product of haemoglobin utilization by the parasite, is neutralized into inert hemozoin in the food vacuole of the parasite. Lipid homeostasis and phospholipid metabolism are crucial for this process, as well as for the parasite’s survival and propagation within the host. P. falciparum harbours a uniquely large family of phospholipases, which are suggested to play key roles in lipid metabolism and utilization. Results Here, we show that one of the parasite phospholipase (P. falciparum lysophospholipase, PfLPL1) plays an essential role in lipid homeostasis linked with the haemoglobin degradation and heme conversion pathway. Fluorescence tagging showed that the PfLPL1 in infected blood cells localizes to dynamic vesicular structures that traffic from the host-parasite interface at the parasite periphery, through the cytosol, to get incorporated into a large vesicular lipid rich body next to the food-vacuole. PfLPL1 is shown to harbour enzymatic activity to catabolize phospholipids, and its transient downregulation in the parasite caused a significant reduction of neutral lipids in the food vacuole-associated lipid bodies. This hindered the conversion of heme, originating from host haemoglobin, into the hemozoin, and disrupted the parasite development cycle and parasite growth. Detailed lipidomic analyses of inducible knock-down parasites deciphered the functional role of PfLPL1 in generation of neutral lipid through recycling of phospholipids. Further, exogenous fatty-acids were able to complement downregulation of PfLPL1 to rescue the parasite growth as well as restore hemozoin levels. Conclusions We found that the transient downregulation of PfLPL1 in the parasite disrupted lipid homeostasis and caused a reduction in neutral lipids essentially required for heme to hemozoin conversion. Our study suggests a crucial link between phospholipid catabolism and generation of neutral lipids (TAGs) with the host haemoglobin degradation pathway. Supplementary Information The online version contains supplementary material available at 10.1186/s12915-021-01042-z.
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Affiliation(s)
- Mohd Asad
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India
| | - Yoshiki Yamaryo-Botté
- ApicoLipid Team, Institute for Advanced Biosciences, CNRS UMR5309, Université Grenoble Alpes, INSERM U1209, Grenoble, France
| | - Mohammad E Hossain
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India
| | - Vandana Thakur
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India
| | - Shaifali Jain
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India
| | - Gaurav Datta
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India
| | - Cyrille Y Botté
- ApicoLipid Team, Institute for Advanced Biosciences, CNRS UMR5309, Université Grenoble Alpes, INSERM U1209, Grenoble, France
| | - Asif Mohmmed
- International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India.
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Coronado L, Zhang XQ, Dorta D, Escala N, Pineda LM, Ng MG, Del Olmo E, Wang CY, Gu YC, Shao CL, Spadafora C. Semisynthesis, Antiplasmodial Activity, and Mechanism of Action Studies of Isocoumarin Derivatives. JOURNAL OF NATURAL PRODUCTS 2021; 84:1434-1441. [PMID: 33979168 DOI: 10.1021/acs.jnatprod.0c01032] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, eight natural isocoumarins (1-8) were isolated from a marine-derived Exserohilum sp. fungus. To explore their structure-activity relationship and discover potent antimalarial leads, a small library of 22 new derivatives (1a-1n, 2a, 3a-3c, 4a-4c, and 7a) were semisynthesized by varying the substituents of the aromatic ring and the aliphatic side chains. The natural compound (1) and three semisynthetic derivatives (1d, 1n, and 2a), possessing an all-cis stereochemistry, exhibited strong antiplasmodial activity with IC50 values of 1.1, 0.8, 0.4, and 2.6 μM, respectively. Mechanism studies show that 1n inhibits hemozoin polymerization and decreases the mitochondrial membrane potential but also inhibits P. falciparum DNA gyrase. 1n not only combines different mechanisms of action but also exhibits a high therapeutic index (CC50/IC50 = 675), high selectivity, and a notable drug-like profile.
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Affiliation(s)
- Lorena Coronado
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
| | - Xue-Qing Zhang
- Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, People's Republic of China
- Hubei Key Laboratory of Natural Product Research and Development (China Three Gorges University), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, People's Republic of China
| | - Doriana Dorta
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
| | - Nerea Escala
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
- Facultad de Farmacia, Universidad de Salamanca, Campus Miguel de Unamuno, s/n, E-37007 Salamanca, Spain
| | - Laura M Pineda
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
| | - Michelle G Ng
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
| | - Esther Del Olmo
- Facultad de Farmacia, Universidad de Salamanca, Campus Miguel de Unamuno, s/n, E-37007 Salamanca, Spain
| | - Chang-Yun Wang
- Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, People's Republic of China
| | - Yu-Cheng Gu
- Syngenta Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom
| | - Chang-Lun Shao
- Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, People's Republic of China
| | - Carmenza Spadafora
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852, Panama
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9
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Adegoke JA, Kochan K, Heraud P, Wood BR. A Near-Infrared "Matchbox Size" Spectrometer to Detect and Quantify Malaria Parasitemia. Anal Chem 2021; 93:5451-5458. [PMID: 33759513 DOI: 10.1021/acs.analchem.0c05103] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New point-of-care diagnostic approaches for malaria that are sensitive to low parasitemia, easy to use in a field setting, and affordable are urgently required to meet the World Health Organization's objective of reducing malaria cases and related life losses by 90% globally on or before 2030. In this study, an inexpensive "matchbox size" near-infrared (NIR) spectrophotometer was used for the first time to detect and quantify malaria infection in vitro from isolated dried red blood cells using a fingerpick volume of blood. This the first study to apply a miniaturized NIR device to diagnose a parasitic infection and identify marker bands indicative of malaria infection in the NIR region. An NIR device has many advantages including wavelength accuracy and repeatability, speed, resolution, and a greatly improved signal-to-noise ratio compared to existing spectroscopic options. Using multivariate data analysis, we discriminated control red blood cells from infected cells and established the limit of detection of the technique. Principal component analysis displayed a good separation between the infected and uninfected RBCs, while partial least-squares regression analysis yielded a robust parasitemia prediction with root-mean-square error of prediction values of 0.446 and 0.001% for the higher and lower parasitemia models, respectively. The R2 values of the higher and lower parasitemia models were 0.947 and 0.931, respectively. Finally, an estimated parasitemia detection limit of 0.00001% and a qunatification limit of 0.001% was achieved; to ascertain the true efficacy of the technique for point-of-care screening, clinical studies using large patient numbers are required, which is the subject of future studies.
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Affiliation(s)
- John A Adegoke
- Centre for Biospectroscopy, School of Chemistry, Faculty of Science, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Kamila Kochan
- Centre for Biospectroscopy, School of Chemistry, Faculty of Science, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Philip Heraud
- Centre for Biospectroscopy, School of Chemistry, Faculty of Science, Monash University, Wellington Road, Clayton, Victoria 3800, Australia.,Department of Microbiology and the Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Bayden R Wood
- Centre for Biospectroscopy, School of Chemistry, Faculty of Science, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
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10
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Artemisinin-Based Drugs Target the Plasmodium falciparum Heme Detoxification Pathway. Antimicrob Agents Chemother 2021; 65:AAC.02137-20. [PMID: 33495226 DOI: 10.1128/aac.02137-20] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 01/16/2021] [Indexed: 12/18/2022] Open
Abstract
Artemisinin (ART)-based antimalarial drugs are believed to exert lethal effects on malarial parasites by alkylating a variety of intracellular molecular targets. Recent work with live parasites has shown that one of the alkylated targets is free heme within the parasite digestive vacuole, which is liberated upon hemoglobin catabolism by the intraerythrocytic parasite, and that reduced levels of heme alkylation occur in artemisinin-resistant parasites. One implication of heme alkylation is that these drugs may inhibit parasite detoxification of free heme via inhibition of heme-to-hemozoin crystallization; however, previous reports that have investigated this hypothesis present conflicting data. By controlling reducing conditions and, hence, the availability of ferrous versus ferric forms of free heme, we modify a previously reported hemozoin inhibition assay to quantify the ability of ART-based drugs to target the heme detoxification pathway under reduced versus oxidizing conditions. Contrary to some previous reports, we find that artemisinins are potent inhibitors of hemozoin crystallization, with effective half-maximal concentrations approximately an order of magnitude lower than those for most quinoline-based antimalarial drugs. We also examine hemozoin and in vitro parasite growth inhibition for drug pairs found in the most commonly used ART-based combination therapies (ACTs). All ACTs examined inhibit hemozoin crystallization in an additive fashion, and all but one inhibit parasite growth in an additive fashion.
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11
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Peric M, Pešić D, Alihodžić S, Fajdetić A, Herreros E, Gamo FJ, Angulo-Barturen I, Jiménez-Díaz MB, Ferrer-Bazaga S, Martínez MS, Gargallo-Viola D, Mathis A, Kessler A, Banjanac M, Padovan J, Bencetić Mihaljević V, Munic Kos V, Bukvić M, Eraković Haber V, Spaventi R. A novel class of fast-acting antimalarial agents: Substituted 15-membered azalides. Br J Pharmacol 2020; 178:363-377. [PMID: 33085774 PMCID: PMC9328652 DOI: 10.1111/bph.15292] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 09/01/2020] [Accepted: 10/08/2020] [Indexed: 12/18/2022] Open
Abstract
Background and Purpose Efficacy of current antimalarial treatments is declining as a result of increasing antimalarial drug resistance, so new and potent antimalarial drugs are urgently needed. Azithromycin, an azalide antibiotic, was found useful in malaria therapy, but its efficacy in humans is low. Experimental Approach Four compounds belonging to structurally different azalide classes were tested and their activities compared to azithromycin and chloroquine. in vitro evaluation included testing against sensitive and resistant Plasmodium falciparum, cytotoxicity against HepG2 cells, accumulation and retention in human erythrocytes, antibacterial activity, and mode of action studies (delayed death phenotype and haem polymerization). in vivo assessment enabled determination of pharmacokinetic profiles in mice, rats, dogs, and monkeys and in vivo efficacy in a humanized mouse model. Key Results Novel fast‐acting azalides were highly active in vitro against P. falciparum strains exhibiting various resistance patterns, including chloroquine‐resistant strains. Excellent antimalarial activity was confirmed in a P. falciparum murine model by strong inhibition of haemozoin‐containing trophozoites and quick clearance of parasites from the blood. Pharmacokinetic analysis revealed that compounds are metabolically stable and have moderate oral bioavailability, long half‐lives, low clearance, and substantial exposures, with blood cells as the preferred compartment, especially infected erythrocytes. Fast anti‐plasmodial action is achieved by the high accumulation into infected erythrocytes and interference with parasite haem polymerization, a mode of action different from slow‐acting azithromycin. Conclusion and Implications The hybrid derivatives described here represent excellent antimalarial drug candidates with the potential for clinical use in malaria therapy.
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Affiliation(s)
- Mihaela Peric
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Center for Translational and Clinical Research, Department for Intercellular Communication, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Dijana Pešić
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Sulejman Alihodžić
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Andrea Fajdetić
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Esperanza Herreros
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain.,Medicines for Malaria Venture, Geneva 15, Switzerland
| | - Francisco Javier Gamo
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain
| | - Iñigo Angulo-Barturen
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain.,The Art of Discovery, Bizkaia, Basque Country, Spain
| | - María Belén Jiménez-Díaz
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain.,The Art of Discovery, Bizkaia, Basque Country, Spain
| | - Santiago Ferrer-Bazaga
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain
| | - María S Martínez
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain
| | - Domingo Gargallo-Viola
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain.,ABAC Therapeutics, Barcelona, Spain
| | - Amanda Mathis
- GlaxoSmithKline, Research Triangle Park, North Carolina, USA.,BioCryst Pharmaceuticals, Durham, North Carolina, USA
| | - Albane Kessler
- GlaxoSmithKline, Tres Cantos Medicines Development Campus, Diseases of the Developing World, Tres Cantos (Madrid), Spain
| | - Mihailo Banjanac
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Jasna Padovan
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | | | - Vesna Munic Kos
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Mirjana Bukvić
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Vesna Eraković Haber
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Fidelta Ltd., Zagreb, Croatia
| | - Radan Spaventi
- GlaxoSmithKline Research Centre Zagreb Ltd., Zagreb, Croatia.,Triadelta Partners Ltd, Zagreb, Croatia
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12
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Herraiz T, Guillén H, González-Peña D, Arán VJ. Antimalarial Quinoline Drugs Inhibit β-Hematin and Increase Free Hemin Catalyzing Peroxidative Reactions and Inhibition of Cysteine Proteases. Sci Rep 2019; 9:15398. [PMID: 31659177 PMCID: PMC6817881 DOI: 10.1038/s41598-019-51604-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 10/03/2019] [Indexed: 01/06/2023] Open
Abstract
Malaria caused by Plasmodium affects millions people worldwide. Plasmodium consumes hemoglobin during its intraerythrocytic stage leaving toxic heme. Parasite detoxifies free heme through formation of hemozoin (β-hematin) pigment. Proteolysis of hemoglobin and formation of hemozoin are two main targets for antimalarial drugs. Quinoline antimarial drugs and analogs (β-carbolines or nitroindazoles) were studied as inhibitors of β-hematin formation. The most potent inhibitors were quinacrine, chloroquine, and amodiaquine followed by quinidine, mefloquine and quinine whereas 8-hydroxyquinoline and β-carbolines had no effect. Compounds that inhibited β-hematin increased free hemin that promoted peroxidative reactions as determined with TMB and ABTS substrates. Hemin-catalyzed peroxidative reactions were potentiated in presence of proteins (i.e. globin or BSA) while antioxidants and peroxidase inhibitors decreased peroxidation. Free hemin increased by chloroquine action promoted oxidative reactions resulting in inhibition of proteolysis by three cysteine proteases: papain, ficin and cathepsin B. Glutathione reversed inhibition of proteolysis. These results show that active quinolines inhibit hemozoin and increase free hemin which in presence of H2O2 that abounds in parasite digestive vacuole catalyzes peroxidative reactions and inhibition of cysteine proteases. This work suggests a link between the action of quinoline drugs with biochemical processes of peroxidation and inhibition of proteolysis.
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Affiliation(s)
- Tomás Herraiz
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN). Spanish National Research Council (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain.
| | - Hugo Guillén
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN). Spanish National Research Council (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
| | - Diana González-Peña
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN). Spanish National Research Council (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
| | - Vicente J Arán
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
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13
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Lee JH, Kim HR, Lee JH, Lee SK, Chun Y, Han SO, Yoo HY, Park C, Kim SW. Enhanced In-Vitro Hemozoin Polymerization by Optimized Process using Histidine-Rich Protein II (HRPII). Polymers (Basel) 2019; 11:E1162. [PMID: 31288462 PMCID: PMC6680884 DOI: 10.3390/polym11071162] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/03/2019] [Accepted: 07/06/2019] [Indexed: 01/27/2023] Open
Abstract
Conductive biopolymers, an important class of functional materials, have received attention in various fields because of their unique electrical, optical, and physical properties. In this study, the polymerization of heme into hemozoin was carried out in an in vitro system by the newly developed heme polymerase (histidine-rich protein 2 (HRP-II)). The HRP-II was produced by recombinant E. coli BL21 from the Plasmodium falciparum gene. To improve the hemozoin production, the reaction conditions on the polymerization were investigated and the maximum production was achieved after about 790 μM at 34 °C with 200 rpm for 24 h. As a result, the production was improved about two-fold according to the stepwise optimization in an in vitro system. The produced hemozoin was qualitatively analyzed using the Fourier transform infrared (FTIR) spectroscopy, energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). Finally, it was confirmed that the enzymatically polymerized hemozoin had similar physical properties to chemically synthesized hemozoin. These results could represent a significant potential for nano-biotechnology applications, and also provide guidance in research related to hemozoin utilization.
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Affiliation(s)
- Ju Hun Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
| | - Hyeong Ryeol Kim
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
| | - Ja Hyun Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
- Department of Food Science and Engineering, Dongyang Mirae University, 445, Gyeongin-ro, Guro-gu, Seoul 08221, Korea
| | - Soo Kweon Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
| | - Youngsang Chun
- Department of Interdisciplinary Bio-Micro System Technology, College of Engineering, Korea University, 145 Anam-ro 5, Seongbuk-gu, Seoul 02841, Korea
| | - Sung Ok Han
- Department of Biotechnology, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea
| | - Hah Young Yoo
- Department of Biotechnology, Sangmyung University, 20, Hongjimun 2-Gil, Jongno-Gu, Seoul 03016, Korea.
| | - Chulhwan Park
- Department of Chemical Engineering, Kwangwoon University, 20, Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Korea.
| | - Seung Wook Kim
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Korea.
- Department of Chemistry, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia.
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14
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Synthesis, Biological Evaluation, and Molecular Modeling Studies of Chiral Chloroquine Analogues as Antimalarial Agents. Antimicrob Agents Chemother 2018; 62:AAC.02347-17. [PMID: 30224532 DOI: 10.1128/aac.02347-17] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 08/16/2018] [Indexed: 11/20/2022] Open
Abstract
In a focused exploration, we designed, synthesized, and biologically evaluated chiral conjugated new chloroquine (CQ) analogues with substituted piperazines as antimalarial agents. In vitro as well as in vivo studies revealed that compound 7c showed potent activity (in vitro 50% inhibitory concentration, 56.98 nM for strain 3D7 and 97.76 nM for strain K1; selectivity index in vivo [up to at a dose of 12.5 mg/kg of body weight], 3,510) as a new lead antimalarial agent. Other compounds (compounds 6b, 6d, 7d, 7h, 8c, 8d, 9a, and 9c) also showed moderate activity against a CQ-sensitive strain (3D7) and superior activity against a CQ-resistant strain (K1) of Plasmodium falciparum Furthermore, we carried out docking and three-dimensional quantitative structure-activity relationship (3D-QSAR) studies of all in-house data sets (168 molecules) of chiral CQ analogues to explain the structure-activity relationships (SAR). Our new findings specify the significance of the H-bond interaction with the side chain of heme for biological activity. In addition, the 3D-QSAR study against the 3D7 strain indicated the favorable and unfavorable sites of CQ analogues for incorporating steric, hydrophobic, and electropositive groups to improve the antimalarial activity.
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15
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Kondaparla S, Manhas A, Dola VR, Srivastava K, Puri SK, Katti SB. Design, synthesis and antiplasmodial activity of novel imidazole derivatives based on 7-chloro-4-aminoquinoline. Bioorg Chem 2018; 80:204-211. [PMID: 29940342 DOI: 10.1016/j.bioorg.2018.06.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 06/03/2018] [Accepted: 06/04/2018] [Indexed: 10/14/2022]
Abstract
A series of short chain 4-aminoquinoline-imidazole derivatives have been synthesized in one pot two step multicomponent reaction using van leusen standard protocol. The diethylamine function of chloroquine is replaced by substituted imidazole derivatives containing tertiary terminal nitrogen. All the synthesized compounds were screened against the chloroquine sensitive (3D7) and chloroquine resistant (K1) strains of Plasmodium falciparum. Some of the compounds (6, 8, 9 and 17) in the series exhibited comparable activity to CQ against K1 strain of P. falciparum. All the compounds displayed resistance factor between 0.09 and 4.57 as against 51 for CQ. Further, these analogues were found to form a strong complex with hematin and inhibit the β-hematin formation, therefore these compounds act via heme polymerization target.
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Affiliation(s)
- Srinivasarao Kondaparla
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
| | - Ashan Manhas
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Vasantha Rao Dola
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Kumkum Srivastava
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Sunil K Puri
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - S B Katti
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
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16
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High-Content Screening of the Medicines for Malaria Venture Pathogen Box for Plasmodium falciparum Digestive Vacuole-Disrupting Molecules Reveals Valuable Starting Points for Drug Discovery. Antimicrob Agents Chemother 2018; 62:AAC.02031-17. [PMID: 29311064 DOI: 10.1128/aac.02031-17] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/20/2017] [Indexed: 02/06/2023] Open
Abstract
Plasmodium falciparum infections leading to malaria have severe clinical manifestations and high mortality rates. Chloroquine (CQ), a former mainstay of malaria chemotherapy, has been rendered ineffective due to the emergence of widespread resistance. Recent studies, however, have unveiled a novel mode of action in which low-micromolar levels of CQ permeabilized the parasite's digestive vacuole (DV) membrane, leading to calcium efflux, mitochondrial depolarization, and DNA degradation. These phenotypes implicate the DV as an alternative target of CQ and suggest that DV disruption is an attractive target for exploitation by DV-disruptive antimalarials. In the current study, high-content screening of the Medicines for Malaria Venture (MMV) Pathogen Box (2015) was performed to select compounds which disrupt the DV membrane, as measured by the leakage of intravacuolar Ca2+ using the calcium probe Fluo-4 AM. The hits were further characterized by hemozoin biocrystallization inhibition assays and dose-response half-maximal (50%) inhibitory concentration (IC50) assays across resistant and sensitive strains. Three hits, MMV676380, MMV085071, and MMV687812, were shown to demonstrate a lack of CQ cross-resistance in parasite strains and field isolates. Through systematic analyses, MMV085071 emerged as the top hit due to its rapid parasiticidal effect, low-nanomolar IC50, and good efficacy in triggering DV disruption, mitochondrial degradation, and DNA fragmentation in P. falciparum These programmed cell death (PCD)-like phenotypes following permeabilization of the DV suggests that these compounds kill the parasite by a PCD-like mechanism. From the drug development perspective, MMV085071, which was identified to be a potent DV disruptor, offers a promising starting point for subsequent hit-to-lead generation and optimization through structure-activity relationships.
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17
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Evaluation of Phytochemistry and Some Biological Activities of Aerial Parts and Seed of Scrophularia Umbrosa Dumort. Jundishapur J Nat Pharm Prod 2017. [DOI: 10.5812/jjnpp.65054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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18
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Sinha S, Sarma P, Sehgal R, Medhi B. Development in Assay Methods for in Vitro Antimalarial Drug Efficacy Testing: A Systematic Review. Front Pharmacol 2017; 8:754. [PMID: 29123481 PMCID: PMC5662882 DOI: 10.3389/fphar.2017.00754] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 10/04/2017] [Indexed: 11/13/2022] Open
Abstract
The emergence and spread of drug resistance are the major challenges in malaria eradication mission. Besides various strategies laid down by World Health Organization, such as vector management, source reduction, early case detection, prompt treatment, and development of new diagnostics and vaccines, nevertheless the need for new and efficacious drugs against malaria has become a critical priority on the global malaria research agenda. At several screening stages, millions of compounds are screened (1,000–2,000,000 compounds per screening campaign), before pre-clinical trials to select optimum lead. Carrying out in vitro screening of antimalarials is very difficult as different assay methods are subject to numerous sources of variability across different laboratories around the globe. Despite this, in vitro screening is an essential part of antimalarial drug development as it enables to resource various confounding factors such as host immune response and drug–drug interaction. Therefore, in this article, we try to illustrate the basic necessity behind in vitro study and how new methods are developed and subsequently adopted for high-throughput antimalarial drug screening and its application in achieving the next level of in vitro screening based on the current approaches (such as stem cells).
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Affiliation(s)
- Shweta Sinha
- Department of Medical Parasitology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Phulen Sarma
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Rakesh Sehgal
- Department of Medical Parasitology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Bikash Medhi
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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19
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Synthesis and Evaluation of Chirally Defined Side Chain Variants of 7-Chloro-4-Aminoquinoline To Overcome Drug Resistance in Malaria Chemotherapy. Antimicrob Agents Chemother 2017; 61:AAC.01152-16. [PMID: 27956423 DOI: 10.1128/aac.01152-16] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 11/20/2016] [Indexed: 11/20/2022] Open
Abstract
A novel 4-aminoquinoline derivative [(S)-7-chloro-N-(4-methyl-1-(4-methylpiperazin-1-yl)pentan-2-yl)-quinolin-4-amine triphosphate] exhibiting curative activity against chloroquine-resistant malaria parasites has been identified for preclinical development as a blood schizonticidal agent. The lead molecule selected after detailed structure-activity relationship (SAR) studies has good solid-state properties and promising activity against in vitro and in vivo experimental malaria models. The in vitro absorption, distribution, metabolism, and excretion (ADME) parameters indicate a favorable drug-like profile.
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20
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Srinivasarao K, Agarwal P, Srivastava K, Haq W, Puri SK, Katti SB. Design, synthesis, and in vitro antiplasmodial activity of 4-aminoquinolines containing modified amino acid conjugates. Med Chem Res 2016. [DOI: 10.1007/s00044-016-1555-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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21
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Lithanatudom P, Wipasa J, Inti P, Chawansuntati K, Svasti S, Fucharoen S, Kangwanpong D, Kampuansai J. Hemoglobin E Prevalence among Ethnic Groups Residing in Malaria-Endemic Areas of Northern Thailand and Its Lack of Association with Plasmodium falciparum Invasion In Vitro. PLoS One 2016; 11:e0148079. [PMID: 26808200 PMCID: PMC4726726 DOI: 10.1371/journal.pone.0148079] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 01/12/2016] [Indexed: 11/18/2022] Open
Abstract
Hemoglobin E (HbE) is one of the most common hemoglobin variants caused by a mutation in the β-globin gene, and found at high frequencies in various Southeast Asian groups. We surveyed HbE prevalence among 8 ethnic groups residing in 5 villages selected for their high period malaria endemicity, and 5 for low endemicity in northern Thailand, in order to uncover factors which may affect genetic persistence of HbE in these groups. We found the overall HbE prevalence 6.7%, with differing frequencies from 0% in the Pwo Karen, the Lawa, and the Skaw Karen to 24% in the Mon. All HbE genes were heterozygous (AE). Differences in HbE prevalence among the studied ethnic groups indirectly documents that ancestries and evolutionary forces, such as drift and admixture, are the important factors in the persistence of HbE distribution in northern Thailand. Furthermore, the presence of HbE in groups of northern Thailand had no effect on the in vitro infectivity and proliferation of Plasmodium falciparum, nor the production of hemozoin, a heme crystal produced by malaria parasites, when compared to normal red-blood-cell controls. Our data may contribute to a better understanding on the persistence of HbE among ethnic groups and its association with malaria.
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Affiliation(s)
| | - Jiraprapa Wipasa
- Research Institutes for Health Sciences, Chiang Mai University, Chiang Mai, Thailand
| | - Pitsinee Inti
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | | | - Saovaros Svasti
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, Nakornpathom, Thailand
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, Nakornpathom, Thailand
| | - Daoroong Kangwanpong
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Jatupol Kampuansai
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- * E-mail:
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22
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Kondaparla S, Soni A, Manhas A, Srivastava K, Puri SK, Katti SB. Synthesis and antimalarial activity of new 4-aminoquinolines active against drug resistant strains. RSC Adv 2016. [DOI: 10.1039/c6ra14016e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present study we have synthesized a new class of 4-aminoquinoline derivatives and bioevaluated them for antimalarial activity against theP. falciparum in vitro(3D7 & K1) andP. yoelii in vivo(N-67 strain).
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Affiliation(s)
- Srinivasarao Kondaparla
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - Awakash Soni
- Parasitology Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - Ashan Manhas
- Parasitology Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - Kumkum Srivastava
- Parasitology Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - Sunil K. Puri
- Parasitology Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - S. B. Katti
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
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M S, Koringa K, Dave U, Gatne D. A modified precise analytical method for anti-malarial screening: Heme polymerization assay. Mol Biochem Parasitol 2015; 201:112-5. [PMID: 26241332 DOI: 10.1016/j.molbiopara.2015.07.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 07/26/2015] [Accepted: 07/28/2015] [Indexed: 11/29/2022]
Abstract
Malarial parasite detoxifies the heme generated in its food vacuole in many ways one of which involves heme polymerization to hemozoin. The existing heme polymerization assays involve use of activators along with buffers for polymerization of heme leading to its precipitation. Such assays then involve special instruments and laborious work of isolating the precipitated polymer and its detection. Simple and precise spectrophotometric and HTS methods were developed for heme polymerization using tween 20 as the activator without isolation of polymerized heme.
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Affiliation(s)
- Saritha M
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V. L. Mehta Road, Vile Parle (West), Mumbai 400056, India
| | - Kashyap Koringa
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V. L. Mehta Road, Vile Parle (West), Mumbai 400056, India
| | - Urja Dave
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V. L. Mehta Road, Vile Parle (West), Mumbai 400056, India
| | - Dipti Gatne
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V. L. Mehta Road, Vile Parle (West), Mumbai 400056, India.
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Young RM, Adendorff MR, Wright AD, Davies-Coleman MT. Antiplasmodial activity: The first proof of inhibition of heme crystallization by marine isonitriles. Eur J Med Chem 2015; 93:373-80. [DOI: 10.1016/j.ejmech.2015.02.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 02/02/2015] [Accepted: 02/07/2015] [Indexed: 10/24/2022]
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25
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Sinha M, Dola VR, Soni A, Agarwal P, Srivastava K, Haq W, Puri SK, Katti SB. Synthesis of chiral chloroquine and its analogues as antimalarial agents. Bioorg Med Chem 2014; 22:5950-60. [PMID: 25284252 DOI: 10.1016/j.bmc.2014.09.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 09/03/2014] [Accepted: 09/05/2014] [Indexed: 11/16/2022]
Abstract
In this investigation, we describe a new approach to chiral synthesis of chloroquine and its analogues. All tested compounds displayed potent activity against chloroquine sensitive as well as chloroquine resistant strains of Plasmodium falciparum in vitro and Plasmodium yoelii in vivo. Compounds S-13 b, S-13c, S-13 d and S-13 i displayed excellent in vitro antimalarial activity with an IC50 value of 56.82, 60.41, 21.82 and 7.94 nM, respectively, in the case of resistant strain. Furthermore, compounds S-13a, S-13c and S-13 d showed in vivo suppression of 100% parasitaemia on day 4 in the mouse model against Plasmodium yoelii when administered orally. These results underscore the application of synthetic methodology and need for further lead optimization.
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Affiliation(s)
- Manish Sinha
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Vasanth R Dola
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Awakash Soni
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Pooja Agarwal
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Kumkum Srivastava
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Wahajul Haq
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Sunil K Puri
- Parasitology Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Seturam B Katti
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
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26
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Sinha M, Dola VR, Agarwal P, Srivastava K, Haq W, Puri SK, Katti SB. Antiplasmodial activity of new 4-aminoquinoline derivatives against chloroquine resistant strain. Bioorg Med Chem 2014; 22:3573-86. [PMID: 24906512 DOI: 10.1016/j.bmc.2014.05.024] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 05/12/2014] [Accepted: 05/12/2014] [Indexed: 10/25/2022]
Abstract
Emergence and spread of multidrug resistant strains of Plasmodium falciparum has severely limited the antimalarial chemotherapeutic options. In order to overcome the obstacle, a set of new side-chain modified 4-aminoquinolines were synthesized and screened against chloroquine-sensitive (3D7) and chloroquine-resistant (K1) strains of P. falciparum. The key feature of the designed molecules is the use of methylpiperazine linked α, β(3)- and γ-amino acids to generate novel side chain modified 4-aminoquinoline analogues. Among the evaluated compounds, 20c and 30 were found more potent than CQ against K1 and displayed a four-fold and a three-fold higher activity respectively, with a good selectivity index (SI=5846 and 11,350). All synthesized compounds had resistance index between 1.06 and >14.13 as against 47.2 for chloroquine. Biophysical studies suggested that this series of compounds act on heme polymerization target.
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Affiliation(s)
- Manish Sinha
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Vasanth R Dola
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Pooja Agarwal
- Parasitology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Kumkum Srivastava
- Parasitology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Wahajul Haq
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Sunil K Puri
- Parasitology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Seturam B Katti
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
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27
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Gorka AP, de Dios A, Roepe PD. Quinoline drug-heme interactions and implications for antimalarial cytostatic versus cytocidal activities. J Med Chem 2013; 56:5231-46. [PMID: 23586757 DOI: 10.1021/jm400282d] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Historically, the most successful molecular target for antimalarial drugs has been heme biomineralization within the malarial parasite digestive vacuole. Heme released from catabolized host red blood cell hemoglobin is toxic, so malarial parasites crystallize heme to nontoxic hemozoin. For years it has been accepted that a number of effective quinoline antimalarial drugs (e.g., chloroquine, quinine, amodiaquine) function by preventing hemozoin crystallization. However, recent studies over the past decade have revealed a surprising molecular diversity in quinoline-heme molecular interactions. This diversity shows that even closely related quinoline drugs may have quite different molecular pharmacology. This paper reviews the molecular diversity and highlights important implications for understanding quinoline antimalarial drug resistance and for future drug design.
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Affiliation(s)
- Alexander P Gorka
- Department of Chemistry, Department of Biochemistry, Cellular, and Molecular Biology, and Center for Infectious Diseases, Georgetown University , 37th and O Streets, NW, Washington, D.C. 20057, United States
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Cytostatic versus cytocidal activities of chloroquine analogues and inhibition of hemozoin crystal growth. Antimicrob Agents Chemother 2012; 57:356-64. [PMID: 23114783 DOI: 10.1128/aac.01709-12] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
We report an improved, nonhazardous, high-throughput assay for in vitro quantification of antimalarial drug inhibition of β-hematin (hemozoin) crystallization performed under conditions that are more physiological relative to previous assays. The assay uses the differential detergent solubility of crystalline and noncrystalline forms of heme and is optimized via the use of lipid catalyst. Using this assay, we quantify the effect of pH on the crystal growth-inhibitory activities of current quinoline antimalarials, evaluate the catalytic efficiencies of different lipids, and test for a possible correlation between hemozoin inhibition by drugs versus their antiplasmodial activity. Consistent with several previous reports, we found a good correlation between hemozoin inhibition potency versus cytostatic antiplasmodial potency (50% inhibitory concentration) for a series of chloroquine (CQ) analogues. However, we found no correlation between hemozoin inhibition potency and cytocidal antiplasmodial potency (50% lethal dose) for the same drugs, suggesting that cellular targets for these two layers of 4-aminoquinoline drug activity differ. This important concept is also explored further for QN and its stereoisomers in the accompanying paper (A. P. Gorka, K. S. Sherlach, A. C. de Dios, and P. D. Roepe, Antimicrob. Agents Chemother. 57:365-374, 2013).
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Solomon VR, Haq W, Srivastava K, Puri SK, Katti SB. Design and synthesis of 3-[(7-chloro-1-oxidoquinolin-4-ylamino)alkyl]-1,3-thiazolidin-4-ones as antimalarial agents. J Enzyme Inhib Med Chem 2012; 28:1048-53. [PMID: 22957722 DOI: 10.3109/14756366.2012.710848] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A new series of quinoline analogs have been synthesized and found active against P. falciparum in vitro and P. yoelli in vivo. Compounds 8, 10 and 11 exhibited superior in vitro activity compared to chloroquine. Selected compounds 8, 10 and 11 exhibited significant suppression of parasitaemia in vivo assay. These analogs form a complex with hematin and inhibit the β-hematin formation, suggesting that this class of compounds act on a heme polymerization target. Further this study confirms that quinoline ring nitrogen is essential for both transportation of the molecule across the membrane as well as for tight binding to hematin.
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Affiliation(s)
- V Raja Solomon
- Division of Medicinal and Process Chemistry, Central Drug Research Institute , Lucknow , India
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30
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Nhien NTT, Huy NT, Uyen DT, Deharo E, Hoa PTL, Hirayama K, Harada S, Kamei K. Effect of Inducers, Incubation Time and Heme Concentration on IC(50) Value Variation in Anti-heme Crystallization Assay. Trop Med Health 2012; 39:119-26. [PMID: 22438701 PMCID: PMC3289280 DOI: 10.2149/tmh.2011-29] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 10/24/2011] [Indexed: 11/11/2022] Open
Abstract
Heme detoxification through crystallization into hemozoin has been suggested as a good target for the development of screening assays for new antimalarials. However, comparisons among the data obtained from different experiments are difficult, and the IC50 values (the concentrations of drug that are required to inhibit 50% of hemozoin formation) for the same drug vary widely. We studied the effects of changes in heme concentration (precursor of β-hematin), incubation time and three inducers (SDS, Tween 20 and linoleic acid) on the IC50 of some antimalarials (chloroquine, quinine, amodiaquine, and clotrimazole). The results showed that increasing both inducer concentration and incubation time raised the IC50 of selected antimalarials. Any change in those factors caused the IC50 value to vary. Standardization of assay conditions is, therefore, necessary to increase reproducibility and reduce discrepancies in assay performance. Considering all of the variables, the best choice of inducers is in the order of SDS > Tween 20 > linoleic acid.
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Affiliation(s)
- Nguyen Thanh Thuy Nhien
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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31
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Solomon VR, Haq W, Srivastava K, Puri SK, Katti SB. Design, synthesis of 4-aminoquinoline-derived thiazolidines and their antimalarial activity and heme polymerization inhibition studies. J Enzyme Inhib Med Chem 2012; 28:619-26. [PMID: 22432870 DOI: 10.3109/14756366.2012.666537] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The present study describes the synthesis of a series of new 4-aminoquinoline-derived thiazolidines and evaluation of their antimalarial activity against a NF-54 strain of Plasmodium falciparum in vitro and N-67 strain of Plasmodium yoelii in vivo. Among the series, two compounds, 2-(4-chloro-phenyl)-thiazolidine-4-carboxylic acid [2-(7-chloro-quinolin-4-ylamino)-ethyl]-amide hydrochloride (14) and 2-(2,6-dichloro-phenyl)-thiazolidine-4-carboxylic acid [2-(7-chloro-quinolin-4-ylamino)-ethyl]-amide hydrochloride (22) exhibited significant suppression of parasitaemia in the in vivo assay. All the analogues were found to form strong complex with haematin and inhibited the β-haematin formation in vitro. These results suggest that these compounds act on heme polymerization target.
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Affiliation(s)
- V Raja Solomon
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, Lucknow, India
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Vathsala PG, Dende C, Nagaraj VA, Bhattacharya D, Das G, Rangarajan PN, Padmanaban G. Curcumin-arteether combination therapy of Plasmodium berghei-infected mice prevents recrudescence through immunomodulation. PLoS One 2012; 7:e29442. [PMID: 22276114 PMCID: PMC3262785 DOI: 10.1371/journal.pone.0029442] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Accepted: 11/28/2011] [Indexed: 12/19/2022] Open
Abstract
Earlier studies in this laboratory have shown the potential of artemisinin-curcumin combination therapy in experimental malaria. In a parasite recrudescence model in mice infected with Plasmodium berghei (ANKA), a single dose of alpha,beta-arteether (ART) with three oral doses of curcumin prevented recrudescence, providing almost 95% protection. The parasites were completely cleared in blood with ART-alone (AE) or ART+curcumin (AC) treatments in the short-term, although the clearance was faster in the latter case involving increased ROS generation. But, parasites in liver and spleen were not cleared in AE or AC treatments, perhaps, serving as a reservoir for recrudescence. Parasitemia in blood reached up to 60% in AE-treated mice during the recrudescence phase, leading to death of animals. A transient increase of up to 2-3% parasitemia was observed in AC-treatment, leading to protection and reversal of splenomegaly. A striking increase in spleen mRNA levels for TLR2, IL-10 and IgG-subclass antibodies but a decrease in those for INFγ and IL-12 was observed in AC-treatment. There was a striking increase in IL-10 and IgG subclass antibody levels but a decrease in INFγ levels in sera leading to protection against recrudescence. AC-treatment failed to protect against recrudescence in TLR2(-/-) and IL-10(-/-) animals. IL-10 injection to AE-treated wild type mice and AC-treated TLR2(-/-) mice was able to prolong survival. Blood from the recrudescence phase in AE-treatment, but not from AC-treatment, was able to reinfect and kill naïve animals. Sera from the recrudescence phase of AC-treated animals reacted with several parasite proteins compared to that from AE-treated animals. It is proposed that activation of TLR2-mediated innate immune response leading to enhanced IL-10 production and generation of anti-parasite antibodies contribute to protective immunity in AC-treated mice. These results indicate a potential for curcumin-based combination therapy to be tested for prevention of recrudescence in falciparum and relapse in vivax malaria.
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Calderón AI, Simithy-Williams J, Gupta MP. Antimalarial natural products drug discovery in Panama. PHARMACEUTICAL BIOLOGY 2012; 50:61-71. [PMID: 22196582 DOI: 10.3109/13880209.2011.602417] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
CONTEXT Malaria is still a major public health problem. The biodiversity of the tropics is extremely rich and represents an invaluable source of novel bioactive molecules. For screening of this diversity more sensitive and economical in vitro methods are needed, Flora of Panama has been studied based on ethnomedical uses for discovering antimalarial compounds. OBJECTIVE This review aims to provide an overview of in vitro screening methodologies for antimalarial drug discovery and to present results of this effort in Panama during the last quarter century. METHODS A literature search in SciFinder and PubMed and original publications of Panamanian scientists was performed to gather all the information on antimalarial drug discovery from the Panamanian flora and in vitro screening methods. RESULTS AND CONCLUSIONS A variety of colorimetric, staining, fluorometric, and mass spectrometry and radioactivity-based methods have been provided. The advantages and limitations of these methods are also discussed. Plants used in ethnomedicine for symptoms of malaria by three native Panamanian groups of Amerindians, Kuna, Ngöbe Buglé and Teribes are provided. Seven most active plants with IC(50) values < 10 μg/mL were identified Talisia nervosa Radlk. (Sapindaceae), Topobea parasitica Aubl.(Melastomataceae), Monochaetum myrtoideum Naudin (Melastomataceae), Bourreria spathulata (Miers) Hemsl.(Boraginaceae), Polygonum acuminatum Kunth (Polygonaceae), Clematis campestris A. St.-Hil. (Ranunculaceae) and Terminalia triflora (Griseb.) Lillo (Combretaceae). Thirty bioactive compounds belonging to a variety of chemical classes such as spermine and isoquinoline alkaloids, glycosylflavones, phenylethanoid glycosides, ecdysteroids, quercetin arabinofuranosides, clerodane-type diterpenoids, sipandinolid, galloylquercetin derivatives, gallates, oleamide and mangiferin derivatives.
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Affiliation(s)
- Angela I Calderón
- Department of Pharmacal Sciences, Harrison School of Pharmacy, Auburn University, AL, USA
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Vargas S, Ndjoko Ioset K, Hay AE, Ioset JR, Wittlin S, Hostettmann K. Screening medicinal plants for the detection of novel antimalarial products applying the inhibition of β-hematin formation. J Pharm Biomed Anal 2011; 56:880-6. [PMID: 21872416 DOI: 10.1016/j.jpba.2011.06.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 06/27/2011] [Accepted: 06/28/2011] [Indexed: 10/18/2022]
Abstract
The identification of novel scaffolds for the development of effective and safe treatments to fight malaria is urgently needed. One of the main opportunities is the discovery of new molecules from natural origin. A simple, robust and cost-effective colorimetric assay based on the inhibition of β-hematin has been adapted to routinely screen plant extracts with the ultimate goal to identify novel antimalarial ingredients. The development of this assay has included a careful optimization of all critical experimental parameters. The β-hematin assay can be completed in less than one working day, requiring a 96-well UV-vis plate reader and low-cost commercially available reagents using a standard operating protocol. It can be used on its own or in combination with the well-known Plasmodium growth inhibition assay and has the obvious merit to be informative at the early stage of drug discovery regarding the mechanism of action of the actives. A total of 40 diverse natural products and 219 plants extracts were tested. Good correlations in respect with specificity (pure compounds 85%, extracts 93%) and positive predictive value (pure compounds 72%, extracts 50%) were obtained in comparison with Plasmodium growth inhibition assay that was used as the reference assay.
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Affiliation(s)
- S Vargas
- School of Pharmaceutical Sciences, University of Geneva, 1211 Geneva 4, Switzerland
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Giusti P, Urban BC, Frascaroli G, Albrecht L, Tinti A, Troye-Blomberg M, Varani S. Plasmodium falciparum-infected erythrocytes and beta-hematin induce partial maturation of human dendritic cells and increase their migratory ability in response to lymphoid chemokines. Infect Immun 2011; 79:2727-36. [PMID: 21464084 PMCID: PMC3191978 DOI: 10.1128/iai.00649-10] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Accepted: 03/28/2011] [Indexed: 11/20/2022] Open
Abstract
Acute and chronic Plasmodium falciparum infections alter the immune competence of the host possibly through changes in dendritic cell (DC) functionality. DCs are the most potent activators of T cells, and migration is integral to their function. Mature DCs express lymphoid chemokine receptors (CCRs), expression of which enables them to migrate to the lymph nodes, where they encounter naïve T cells. The present study aimed to investigate the impact of the synthetic analog to malaria parasite pigment hemozoin, i.e., β-hematin, or infected erythrocytes (iRBCs) on the activation status of human monocyte-derived DCs and on their expression of CCRs. Human monocyte-derived DCs partially matured upon incubation with β-hematin as indicated by an increased expression of CD80 and CD83. Both β-hematin and iRBCs provoked the release of proinflammatory and anti-inflammatory cytokines, such as interleukin-6 (IL-6), IL-10, and tumor necrosis factor alpha, but not IL-12, and induced upregulation of the lymphoid chemokine receptor CXCR4, which was coupled to an increased migration to lymphoid ligands. Taken together, these results suggest that the partial and transient maturation of human myeloid DCs upon stimulation with malaria parasite-derived products and the increased IL-10 but lack of IL-12 secretion may lead to suboptimal activation of T cells. This may in turn lead to impaired adaptive immune responses and therefore insufficient clearance of the parasites.
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Affiliation(s)
- Pablo Giusti
- Department of Immunology, Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Britta C. Urban
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
- KEMRI-Wellcome Trust Collaborative Research Programme, Centre for Geographical Medicine, Kilifi, Kenya
| | | | - Letusa Albrecht
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Anna Tinti
- Department of Biochemistry G. Moruzzi, University of Bologna, Bologna, Italy
| | - Marita Troye-Blomberg
- Department of Immunology, Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Stefania Varani
- Department of Immunology, Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
- Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska University Hospital, Huddinge, Sweden
- Department of Hematology and Clinical Oncology, L. and A. Seragnoli, University of Bologna, Bologna, Italy
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Toh SQ, Glanfield A, Gobert GN, Jones MK. Heme and blood-feeding parasites: friends or foes? Parasit Vectors 2010; 3:108. [PMID: 21087517 PMCID: PMC2999593 DOI: 10.1186/1756-3305-3-108] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Accepted: 11/18/2010] [Indexed: 12/01/2022] Open
Abstract
Hemoparasites, like malaria and schistosomes, are constantly faced with the challenges of storing and detoxifying large quantities of heme, released from their catabolism of host erythrocytes. Heme is an essential prosthetic group that forms the reactive core of numerous hemoproteins with diverse biological functions. However, due to its reactive nature, it is also a potentially toxic molecule. Thus, the acquisition and detoxification of heme is likely to be paramount for the survival and establishment of parasitism. Understanding the underlying mechanism involved in this interaction could possibly provide potential novel targets for drug and vaccine development, and disease treatment. However, there remains a wide gap in our understanding of these mechanisms. This review summarizes the biological importance of heme for hemoparasite, and the adaptations utilized in its sequestration and detoxification.
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Affiliation(s)
- Shu Qin Toh
- Queensland Institute of Medical Research, Herston, Queensland, 4006, Australia.
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37
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Solomon VR, Haq W, Smilkstein M, Srivastava K, Puri SK, Katti SB. 4-Aminoquinoline derived antimalarials: synthesis, antiplasmodial activity and heme polymerization inhibition studies. Eur J Med Chem 2010; 45:4990-6. [PMID: 20805010 DOI: 10.1016/j.ejmech.2010.07.068] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Revised: 07/29/2010] [Accepted: 07/30/2010] [Indexed: 11/16/2022]
Abstract
A new series of 4-aminoquinoline derivatives have been synthesized and found to be active against both susceptible and resistant strains of Plasmodium falciparum in vitro. Compound 1-[3-(7-chloro-quinolin-4-ylamino)-propyl]-3-cyclopropyl-thiourea (7) exhibited superior in vitro activity against resistant strains of P. falciparum as compared to chloroquine (CQ). All the compounds showed resistance factor between 0.59 and 4.31 as against 5.05 for CQ. Spectroscopic studies suggested that this class of compounds act on heme polymerization target.
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Affiliation(s)
- V R Solomon
- Medicinal and Process Chemistry Division, Central Drug Research Institute, MG Road, Lucknow 226 001, India
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Downstream effects of haemoglobinase inhibition in Plasmodium falciparum-infected erythrocytes. Mol Biochem Parasitol 2010; 173:81-7. [PMID: 20478341 DOI: 10.1016/j.molbiopara.2010.05.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 04/28/2010] [Accepted: 05/08/2010] [Indexed: 12/22/2022]
Abstract
Blood-stage malarial parasites (Plasmodium falciparum) digest large quantities of host haemoglobin during their asexual development in erythrocytes. The haemoglobin digestion pathway, involving a succession of cleavages by various peptidases, appears to be essential for parasite development and has received much attention as an antimalarial drug target. A variety of peptidase inhibitors that have potent antimalarial activity are believed to inhibit and/or kill parasites by blocking haemoglobin digestion. It has not however been established how such a blockage might lead to parasite death. The answer to this question should lie in identifying the affected physiological function, but the purpose of excess haemoglobin digestion by P. falciparum has for many years been the subject of debate. The process was traditionally believed to be nutritional until Lew et al. [Blood 2003;101:4189-94] suggested that it is linked to volume control of the infected erythrocyte and is necessary to prevent premature osmotic lysis of the host cell. Their model predicts that sufficient inhibition of haemoglobin degradation should result in premature haemolysis. In this study we examined the downstream effects of reduced haemoglobin digestion on osmoprotection and nutrition. We found that inhibitors of haemoglobinases (plasmepsins, falcipains and aminopeptidases) did not cause premature haemolysis. The inhibitors did however block parasite development and this effect corresponded to a strong inhibition of protein synthesis. The effect on protein synthesis (i) occurred at inhibitor concentrations and times of exposure that were relevant to parasite growth inhibition, (ii) was observed with different chemical classes of inhibitor, and (iii) was synergistic when a plasmepsin and a falcipain inhibitor were combined, reflecting the well-established antimalarial synergism of the combination. Taken together, the results suggest that the likely primary downstream effect of inhibition of haemoglobin degradation is amino acid depletion, leading to blockade of protein synthesis, and that the parasite probably degrades globin for nutritional purposes.
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Mauk MR, Rosell FI, Mauk AG. Metal ion facilitated dissociation of heme from b-type heme proteins. J Am Chem Soc 2010; 131:16976-83. [PMID: 19874033 DOI: 10.1021/ja907484j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Addition of Ni(2+), Cu(2+), or Zn(2+) (10-40 equiv) to metMb in sodium bicarbonate buffer (25 degrees C) at alkaline pH (7.8-9.5) results in a time-dependent (2-6 h) change in the electronic absorption spectrum of the protein that is consistent with dissociation of the heme from the active site and that can be largely reversed by addition of EDTA. Similar treatment of cytochrome b(5), indoleamine 2,3-dioxygenase, and cytochrome P450(cam) (in the presence or absence of camphor) produces a similar spectroscopic response. Elution of metMb treated with Ni(2+) in this manner over an anion exchange column in buffer containing Ni(2+) affords apo-myoglobin without exposure to acidic pH or organic solvents as usually required. Bovine liver catalase, in which the heme groups are remote from the surface of the protein, and horseradish peroxidase, which has four disulfide bonds and just three histidyl residues, exhibit a much smaller spectroscopic response. We propose that formation of carbamino groups by reaction of bicarbonate with protein amino groups promotes both protein solubility and the interaction of the protein with metal ions, thereby avoiding precipitation while destabilizing the interaction of heme with the protein. From these observations, bicarbonate buffers may be of value in the study of nonmembrane proteins of limited solubility.
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Affiliation(s)
- Marcia R Mauk
- Department of Biochemistry and Molecular Biology, Life Sciences Centre, 2350 Health Sciences Mall, University of British Columbia, Vancouver, BC V6T 1Z3 Canada
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Synthesis and antimalarial activities of cyclen 4-aminoquinoline analogs. Antimicrob Agents Chemother 2009; 53:1320-4. [PMID: 19171802 DOI: 10.1128/aac.01304-08] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In an attempt to augment the efficacy of 7-chloro 4-aminoquinoline analogs and also to overcome resistance to antimalarial agents, we synthesized three cyclen (1,4,7,10-tetraazacyclododecane) analogs of chloroquine [a bisquinoline derivative, 7-chloro-4-(1,4,7,10-tetraaza-cyclododec-1-yl)-quinoline HBr, and a 7-chloro-4-(1,4,7,10-tetraaza-cyclododec-1-yl)-quinoline-Zn(2+) complex]. The bisquinoline displays the most potent in vitro and in vivo antimalarial activities. It displays 50% inhibitory concentrations (IC(50)s) of 7.5 nM against the D6 (chloroquine-sensitive) clone of Plasmodium falciparum and 19.2 nM against the W2 (chloroquine-resistant) clone, which are comparable to those of artemisinin (10.6 and 5.0 nM, respectively) and lower than those of chloroquine (10.7 and 87.2 nM, respectively), without any evidence of cytotoxicity to mammalian cells, indicating a high selectivity index (>1,333 against D6 clone and >521 against W2 clone). Potent antimalarial activities of the bisquinoline against chloroquine- and mefloquine-resistant strains of P. falciparum were also confirmed by in vitro [(3)H]hypoxanthine incorporation assay. The in vivo antimalarial activity of the bisquinoline, as determined in P. berghei-infected mice, is comparable to that of chloroquine (50% effective dose, <or=1.1 mg/kg when given orally); no apparent toxicity has been observed up to the highest dose tested (3 x 30 mg/kg). The bisquinoline inhibits in vitro hemozoin (beta-hematin) formation with an IC(50) of 1.1 microM, which is about 10-fold more potent than chloroquine (IC(50) 9.5 microM). Overall, this article describes the discovery of a new class of cyclen 4-aminoquinoline analogs as potent antimalarial drugs.
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Loup C, Lelièvre J, Benoit-Vical F, Meunier B. Trioxaquines and heme-artemisinin adducts inhibit the in vitro formation of hemozoin better than chloroquine. Antimicrob Agents Chemother 2007; 51:3768-70. [PMID: 17698628 PMCID: PMC2043280 DOI: 10.1128/aac.00239-07] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Trioxaquines, potential antimalarial agents, and heme-artemisinin adducts, resulting from the alkylation of heme by artemisinin, were evaluated as inhibitors of beta-hematin formation in 10 M acetate medium at pH 5.
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Affiliation(s)
- Christophe Loup
- Laboratoire de Chimie de Coordination, CNRS, 205 Route de Narbonne, 31000, Toulouse Cedex 4, France.
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Huy NT, Uyen DT, Maeda A, Trang DTX, Oida T, Harada S, Kamei K. Simple colorimetric inhibition assay of heme crystallization for high-throughput screening of antimalarial compounds. Antimicrob Agents Chemother 2006; 51:350-3. [PMID: 17088494 PMCID: PMC1797674 DOI: 10.1128/aac.00985-06] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Current assays for screening new antimalarials need initiators of beta-hematin formation that require laborious preparation, special devices, and substrates. In this study, based on reduction of heme absorption in beta-hematin formation, we developed a simple colorimetric assay using Tween 20 as an initiator and a microplate reader for high-throughput screening of inhibitors of beta-hematin formation.
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Affiliation(s)
- Nguyen Tien Huy
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Scholl PF, Tripathi AK, Sullivan DJ. Bioavailable iron and heme metabolism in Plasmodium falciparum. Curr Top Microbiol Immunol 2006; 295:293-324. [PMID: 16265896 DOI: 10.1007/3-540-29088-5_12] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Iron metabolism is essential for cell function and potentially toxic because iron can catalyze oxygen radical production. Malaria-attributable anemia and iron deficiency anemia coincide as being treatable diseases in the developing world. In absolute amounts, more than 95% of Plasmodium metal biochemistry occurs in the acidic digestive vacuole where heme released from hemoglobin catabolism forms heme crystals. The antimalarial quinolines interfere with crystallization. Despite the completion of the Plasmodium genome, many 'gene gaps' exist in components of the metal pathways described in mammalian or yeast cells. Present evidence suggests that parasite bioavailable iron originates from a labile erythrocyte cytosolic pool rather than from abundant heme iron. Indeed the parasite has to make its own heme within two separate organelles, the mitochondrion and the apicomplast. Paradoxically, despite the abundance of iron within the erythrocyte, iron chelators are cytocidal to the Plasmodium parasite. Hemozoin has become a sensitive biomarker for laser desorption mass spectrometry detection of Plasmodium infection in both mice and humans.
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Affiliation(s)
- P F Scholl
- Department of Environmental Health Sciences, Baltimore, MD 21205, USA
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Moore LR, Fujioka H, Williams PS, Chalmers JJ, Grimberg B, Zimmerman P, Zborowski M. Hemoglobin degradation in malaria-infected erythrocytes determined from live cell magnetophoresis. FASEB J 2006; 20:747-9. [PMID: 16461330 PMCID: PMC3728832 DOI: 10.1096/fj.05-5122fje] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
During intra-erythrocytic development, malaria trophozoites digest hemoglobin, which leads to parasite growth and asexual replication while accumulating toxic heme. To avoid death, the parasite synthesizes insoluble hemozoin crystals in the digestive vacuole through polymerization of beta-hematin dimers. In the process, the heme is converted to a high-spin ferriheme whose magnetic properties were studied as early as 1936 by Pauling et al. Here, by magnetophoretic cell motion analysis, we provide evidence for a graduated increase of live cell magnetic susceptibility with developing blood-stage parasites, compatible with the increase in hemozoin content and the mechanism used by P. falciparum to avoid heme toxicity. The measured magnetophoretic mobility of the erythrocyte infected with a late-stage schizont form was m = 2.94 x 10(-6) mm3 s/kg, corresponding to the net volume magnetic susceptibility (relative to water) of Deltachi = 1.80 x 10(-6), significantly higher than that of the oxygenated erythrocyte (-0.18x10(-6)) but lower than that of the fully deoxygenated erythrocyte (3.33x10(-6)). The corresponding fraction of hemoglobin converted to hemozoin, calculated based on the known magnetic susceptibilities of hemoglobin heme and hemozoin ferriheme, was 0.50, in agreement with the published biochemical and crystallography data. Magnetophoretic analysis of live erythrocytes could become significant for antimalarial drug susceptibility and resistance determination.
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Affiliation(s)
- Lee R. Moore
- Department of Biomedical Engineering Lerner Research Institute The Cleveland Clinic Foundation, Cleveland, Ohio
| | - Hisashi Fujioka
- Institute of Pathology Case Western Reserve University School of Medicine, Cleveland, Ohio
| | - P. Stephen Williams
- Department of Biomedical Engineering Lerner Research Institute The Cleveland Clinic Foundation, Cleveland, Ohio
| | - Jeffrey J. Chalmers
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio
| | - Brian Grimberg
- The Center for Global Health & Diseases, Case Western Reserve University, Cleveland, Ohio
| | - Peter Zimmerman
- The Center for Global Health & Diseases, Case Western Reserve University, Cleveland, Ohio
| | - Maciej Zborowski
- Department of Biomedical Engineering Lerner Research Institute The Cleveland Clinic Foundation, Cleveland, Ohio
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