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Tripathi J, Stoklasa M, Nayak S, En Low K, Qian Hui Lee E, Duong Tien QH, Rénia L, Malleret B, Bozdech Z. The artemisinin-induced dormant stages of Plasmodium falciparum exhibit hallmarks of cellular quiescence/senescence and drug resilience. Nat Commun 2024; 15:7485. [PMID: 39209862 PMCID: PMC11362153 DOI: 10.1038/s41467-024-51846-0] [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: 02/14/2023] [Accepted: 08/20/2024] [Indexed: 09/04/2024] Open
Abstract
Recrudescent infections with the human malaria parasite, Plasmodium falciparum, presented traditionally the major setback of artemisinin-based monotherapies. Although the introduction of artemisinin combination therapies (ACT) largely solved the problem, the ability of artemisinin to induce dormant parasites still poses an obstacle for current as well as future malaria chemotherapeutics. Here, we use a laboratory model for induction of dormant P. falciparum parasites and characterize their transcriptome, drug sensitivity profile, and cellular ultrastructure. We show that P. falciparum dormancy requires a ~ 5-day maturation process during which the genome-wide gene expression pattern gradually transitions from the ring-like state to a unique form. The transcriptome of the mature dormant stage carries hallmarks of both cellular quiescence and senescence, with downregulation of most cellular functions associated with growth and development and upregulation of selected metabolic functions and DNA repair. Moreover, the P. falciparum dormant stage is considerably more resistant to antimalaria drugs compared to the fast-growing asexual stages. Finally, the irregular cellular ultrastructure further suggests unique properties of this developmental stage of the P. falciparum life cycle that should be taken into consideration by malaria control strategies.
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Affiliation(s)
- Jaishree Tripathi
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore.
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, 117597, Singapore.
| | - Michal Stoklasa
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore
| | - Sourav Nayak
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore
| | - Kay En Low
- Electron Microscopy Unit, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, 117597, Singapore
| | - Erica Qian Hui Lee
- Department of Microbiology and Immunology, Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, 117597, Singapore
| | - Quang Huy Duong Tien
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore
| | - Laurent Rénia
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University (NTU), Singapore, 636921, Singapore
- A*STAR Infectious Diseases Labs (A*STAR ID Labs), Agency for Science, Technology and Research (A*STAR), Singapore, 138648, Singapore
| | - Benoit Malleret
- Electron Microscopy Unit, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, 117597, Singapore
- Department of Microbiology and Immunology, Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, 117597, Singapore
| | - Zbynek Bozdech
- School of Biological Sciences, Nanyang Technological University (NTU), Singapore, 637551, Singapore.
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Ilieva Y, Zaharieva MM, Najdenski H, Kroumov AD. Antimicrobial Activity of Arthrospira (Former Spirulina) and Dunaliella Related to Recognized Antimicrobial Bioactive Compounds. Int J Mol Sci 2024; 25:5548. [PMID: 38791586 PMCID: PMC11122404 DOI: 10.3390/ijms25105548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 05/10/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024] Open
Abstract
With the increasing rate of the antimicrobial resistance phenomenon, natural products gain our attention as potential drug candidates. Apart from being used as nutraceuticals and for biotechnological purposes, microalgae and phytoplankton have well-recognized antimicrobial compounds and proved anti-infectious potential. In this review, we comprehensively outline the antimicrobial activity of one genus of cyanobacteria (Arthrospira, formerly Spirulina) and of eukaryotic microalgae (Dunaliella). Both, especially Arthrospira, are mostly used as nutraceuticals and as a source of antioxidants for health supplements, cancer therapy and cosmetics. Their diverse bioactive compounds provide other bioactivities and potential for various medical applications. Their antibacterial and antifungal activity vary in a broad range and are strain specific. There are strains of Arthrospira platensis with very potent activity and minimum inhibitory concentrations (MICs) as low as 2-15 µg/mL against bacterial fish pathogens including Bacillus and Vibrio spp. Arthrospira sp. has demonstrated an inhibition zone (IZ) of 50 mm against Staphylococcus aureus. Remarkable is the substantial amount of in vivo studies of Arthrospira showing it to be very promising for preventing vibriosis in shrimp and Helicobacter pylori infection and for wound healing. The innovative laser irradiation of the chlorophyll it releases can cause photodynamic destruction of bacteria. Dunaliella salina has exhibited MIC values lower than 300 µg/mL and an IZ value of 25.4 mm on different bacteria, while Dunaliella tertiolecta has demonstrated MIC values of 25 and 50 μg/mL against some Staphylococcus spp. These values fulfill the criteria for significant antimicrobial activity and sometimes are comparable or exceed the activity of the control antibiotics. The bioactive compounds which are responsible for that action are fatty acids including PUFAs, polysaccharides, glycosides, peptides, neophytadiene, etc. Cyanobacteria, such as Arthrospira, also particularly have antimicrobial flavonoids, terpenes, alkaloids, saponins, quinones and some unique-to-them compounds, such as phycobiliproteins, polyhydroxybutyrate, the peptide microcystin, etc. These metabolites can be optimized by using stress factors in a two-step process of fermentation in closed photobioreactors (PBRs).
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Affiliation(s)
| | | | | | - Alexander Dimitrov Kroumov
- Department of Infectious Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 26 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria; (Y.I.); (M.M.Z.); (H.N.)
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Laminou IM, Issa I, Adehossi E, Maman K, Jackou H, Coulibaly E, Tohon ZB, Ahmed J, Sanoussi E, Koko D. Therapeutic efficacy and tolerability of artemether-lumefantrine for uncomplicated Plasmodium falciparum malaria in Niger, 2020. Malar J 2024; 23:144. [PMID: 38741101 DOI: 10.1186/s12936-024-04945-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 04/12/2024] [Indexed: 05/16/2024] Open
Abstract
BACKGROUND Monitoring therapeutic efficacy is important to ensure the efficacy of artemisinin-based combination therapy (ACT) for malaria. The current first-line treatment for uncomplicated malaria recommended by the National Malaria Control Program in Niger is artemether-lumefantrine (AL). In 2020, an in vivo study was carried out to evaluate clinical and parasitological responses to AL as well as the molecular resistance to the drug in three sentinel sites: Agadez, Tessaoua and Gaya, in Niger. METHODS A multi-center, single-arm trial was conducted according to the 28-day World Health Organization (WHO) 2009 therapeutic efficacy study protocol. Children between 6 months and 15 years with confirmed uncomplicated Plasmodium falciparum infection and 1000-200,000 asexual parasites/μL of blood were enrolled and followed up for 28 days. Uncorrected and PCR-corrected efficacy results at day 28 were calculated, and molecular correction was performed by genotyping the msp1, msp2, and glurp genes. The pfk13, pfdhfr, pfdhps, pfcrt and pfmdr genes were analyzed by PCR and Sanger sequencing. The Kaplan-Meier curve assessed parasite clearance. RESULTS A total of 255 patients were enrolled in the study. The adequate clinical and parasitological response after PCR correction was 98.9% (95% CI 96.4-101.0%), 92.2% (85.0-98.5%) and 97.1% (93.1-101.0%) in Gaya, Tessaoua and Agadez, respectively. No adverse events were observed. Ten mutations (SNP) were found, including 7 synonyms (K248K, G690G, E691E, E612E, C469C, G496G, P718P) and 3 non-synonyms (N594K, R255K, V714S). Two mutations emerged: N594K and V714S. The R255K mutation detected in Southeast Asia was also detected. The pfdhpsK540E and pfdhfrI164L mutations associated with high levels of resistance are absent. There is a reversal of chloroquine resistance. CONCLUSION The study findings indicate that AL is effective and well tolerated for the treatment of uncomplicated malaria in three sites in Niger. The emergence of a pfk13 mutation requires additional testing such as the Ring Stage Assay and CRISPR/Cas9 to confirm the role of these emerging mutations. Trial registration NCT05070520, October 7, 2021.
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Affiliation(s)
| | | | - Eric Adehossi
- Abdou Moumouni School of Health Sciences at University of Niamey-Niger , Niamey, Niger
| | | | | | - Eric Coulibaly
- U.S. President's Malaria Initiative, USAID, Niamey, Niger
| | | | - Jehan Ahmed
- U.S. President's Malaria Initiative Impact Malaria, Atlanta, USA
| | - Elisha Sanoussi
- U.S. President's Malaria Initiative Impact Malaria, Niamey, Niger
| | - Daniel Koko
- U.S. President's Malaria Initiative Impact Malaria, Niamey, Niger
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Shukla M, Rathi K, Hassam M, Yadav DK, Karnatak M, Rawat V, Verma VP. An overview on the antimalarial activity of 1,2,4-trioxanes, 1,2,4-trioxolanes and 1,2,4,5-tetraoxanes. Med Res Rev 2024; 44:66-137. [PMID: 37222435 DOI: 10.1002/med.21979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 05/04/2023] [Accepted: 05/08/2023] [Indexed: 05/25/2023]
Abstract
The demand for novel, fast-acting, and effective antimalarial medications is increasing exponentially. Multidrug resistant forms of malarial parasites, which are rapidly spreading, pose a serious threat to global health. Drug resistance has been addressed using a variety of strategies, such as targeted therapies, the hybrid drug idea, the development of advanced analogues of pre-existing drugs, and the hybrid model of resistant strains control mechanisms. Additionally, the demand for discovering new potent drugs grows due to the prolonged life cycle of conventional therapy brought on by the emergence of resistant strains and ongoing changes in existing therapies. The 1,2,4-trioxane ring system in artemisinin (ART) is the most significant endoperoxide structural scaffold and is thought to be the key pharmacophoric moiety required for the pharmacodynamic potential of endoperoxide-based antimalarials. Several derivatives of artemisinin have also been found as potential treatments for multidrug-resistant strain in this area. Many 1,2,4-trioxanes, 1,2,4-trioxolanes, and 1,2,4,5-tetraoxanes derivatives have been synthesised as a result, and many of these have shown promise antimalarial activity both in vivo and in vitro against Plasmodium parasites. As a consequence, efforts to develop a functionally straight-forward, less expensive, and vastly more effective synthetic pathway to trioxanes continue. This study aims to give a thorough examination of the biological properties and mode of action of endoperoxide compounds derived from 1,2,4-trioxane-based functional scaffolds. The present system of 1,2,4-trioxane, 1,2,4-trioxolane, and 1,2,4,5-tetraoxane compounds and dimers with potentially antimalarial activity will be highlighted in this systematic review (January 1963-December 2022).
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Affiliation(s)
- Monika Shukla
- Department of Chemistry, Banasthali University, Newai, Rajasthan, India
| | - Komal Rathi
- Department of Chemistry, Banasthali University, Newai, Rajasthan, India
| | - Mohammad Hassam
- Department of Chemistry, Chemveda Life Sciences Pvt Ltd, Hyderabad, Telangana, India
| | - Dinesh Kumar Yadav
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur, Rajasthan, India
| | - Manvika Karnatak
- Department of Chemistry, Banasthali University, Newai, Rajasthan, India
| | - Varun Rawat
- School of Chemistry, Tel Aviv University, Tel Aviv, Israel
| | - Ved Prakash Verma
- Department of Chemistry, Banasthali University, Newai, Rajasthan, India
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Tewari P, Ma P, Gan G, Janhavi A, Choo ELW, Koo JR, Dickens BL, Lim JT. Non-linear associations between meteorological factors, ambient air pollutants and major mosquito-borne diseases in Thailand. PLoS Negl Trop Dis 2023; 17:e0011763. [PMID: 38150471 PMCID: PMC10752508 DOI: 10.1371/journal.pntd.0011763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 10/31/2023] [Indexed: 12/29/2023] Open
Abstract
BACKGROUND Transmission intensity for mosquito-borne diseases are highly heterogenous and multi-factorial. Understanding risk factors associated to disease transmission allow the optimization of vector control. This study sets out to understand and compare the combined anthropogenic and environmental risk factors of four major mosquito-borne diseases, dengue, malaria, chikungunya and Japanese encephalitis in Thailand. METHODS An integrated analysis of mosquito-borne diseases, meteorological and ambient air pollutants of 76 provinces of Thailand was conducted over 2003-2021. We explored the use of generalized linear models and generalized additive models to consider both linear and non-linear associations between meteorological factors, ambient air pollutants and mosquito-borne disease incidence. Different assumptions on spatio-temporal dependence and nonlinearity were considered through province-specific and panel models, as well as different spline functions. Disease-specific model evidence was assessed to select best-fit models for epidemiological inference downstream. RESULTS Analyses indicated several findings which can be generally applied to all diseases explored: (1) higher AH above mean values was positively associated with disease case counts (2) higher total precipitation above mean values was positively associated with disease case counts (3) extremely high temperatures were negatively associated with disease case counts (4) higher SO2 and PM2.5 surface concentrations were negatively associated with disease case counts. However, the relationships between disease and RH, non-extreme temperatures and CO surface concentration were more mixed, with directions of associations changing across the different diseases considered. CONCLUSIONS This study found protective and enhancing effects of meteorological and ambient air pollutant factors on mosquito-borne diseases burdens in Thailand. Further studies should employ these factors to understand and predict risk factors associated with mosquito-borne disease transmission.
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Affiliation(s)
- Pranav Tewari
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Pei Ma
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Gregory Gan
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - A. Janhavi
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Esther Li Wen Choo
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Joel Ruihan Koo
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Borame Lee Dickens
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Jue Tao Lim
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
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Sharma S, Ali ME. How do the mutations in PfK13 protein promote anti-malarial drug resistance? J Biomol Struct Dyn 2023; 41:7329-7338. [PMID: 36153000 DOI: 10.1080/07391102.2022.2120539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 08/27/2022] [Indexed: 10/14/2022]
Abstract
Plasmodium falciparum develops resistance to artemisinin upon exposure to the anti-malarial drug. Various mutations in the Plasmodium falciparum Kelch13 (PfK13) protein such as Y493H, R539T, I543T and C580Y have been associated with anti-malarial drug resistance. These mutations impede the regular ubiquitination process that eventually invokes drug resistance. However, the relationship between the mutation and the mechanism of drug resistance has not yet been fully elucidated. The comparative protein dynamics are studied by performing the classical molecular dynamics (MD) simulations and subsequent analysis of the trajectories adopting root-mean-square fluctuations, the secondary-structure predictions and the dynamical cross-correlation matrix analysis tools. Here, we observed that the mutations in the Kelch-domain do not have any structural impact on the mutated site; however, it significantly alters the overall dynamics of the protein. The loop-region of the BTB-domain especially for Y493H and C580Y mutants is found to have the enhanced dynamical fluctuations. The enhanced fluctuations in the BTB-domain could affect the protein-protein (PfK13-Cullin) binding interactions in the ubiquitination process and eventually lead to anti-malarial drug resistance.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Shikha Sharma
- Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, India
| | - Md Ehesan Ali
- Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, India
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Shi S, Luo H, Ji Y, Ouyang H, Wang Z, Wang X, Hu R, Wang L, Wang Y, Xia J, Cheng B, Bao B, Li X, Liao G, Xu B. Repurposing Dihydroartemisinin to Combat Oral Squamous Cell Carcinoma, Associated with Mitochondrial Dysfunction and Oxidative Stress. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2023; 2023:9595201. [PMID: 37273554 PMCID: PMC10239307 DOI: 10.1155/2023/9595201] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/28/2022] [Accepted: 10/06/2022] [Indexed: 08/15/2023]
Abstract
Oral squamous cell carcinoma (OSCC), with aggressive locoregional invasion, has a high rate of early recurrences and poor prognosis. Dihydroartemisinin (DHA), as a derivative of artemisinin, has been found to exert potent antitumor activity. Recent studies reported that DHA suppresses OSCC cell growth and viability through the regulation of reactive oxygen species (ROS) production and mitochondrial calcium uniporter. However, the mechanism underlying the action of DHA on OSCCs remains elusive. In the study, we observed that 159 genes were remarkably misregulated in primary OSCC tumors associated with DHA-inhibited pathways, supporting that OSCCs are susceptible to DHA treatment. Herein, our study showed that DHA exhibited promising effects to suppress OSCC cell growth and survival, and single-cell colony formation. Interestingly, the combination of DHA and cisplatin (CDDP) significantly reduced the toxicity of CDDP treatment alone on human normal oral cells (NOK). Moreover, DHA remarkably impaired mitochondrial structure and function, and triggered DNA damage and ROS generation, and activation of mitophagy. In addition, DHA induced leakage of cytochrome C and apoptosis-inducing factor (AIF) from mitochondria, elevated Bax/cleaved-caspase 3 expression levels and compromised Bcl2 protein expression. In the OSCC tumor-xenograft mice model, DHA remarkably suppressed tumor growth and induced apoptosis of OSCCs in vivo. Intriguingly, a selective mitophagy inhibitor Mdivi-1 could significantly reinforce the anticancer activity of DHA treatment. DHA and Mdivi-1 can synergistically suppress OSCC cell proliferation and survival. These data uncover a previously unappreciated contribution of the mitochondria-associated pathway to the antitumor activity of DHA on OSCCs. Our study shed light on a new aspect of a DHA-based therapeutic strategy to combat OSCC tumors.
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Affiliation(s)
- Shanwei Shi
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
- Hospital of Stomatology, Department of Oral and Maxillofacial Surgery, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Huigen Luo
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Yuna Ji
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Huiya Ouyang
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Zheng Wang
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Xinchen Wang
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Renjie Hu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Lihong Wang
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Yun Wang
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Juan Xia
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Bin Cheng
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Baicheng Bao
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Xin Li
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
- National Engineering Research Center of JUNCAO Technology, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Guiqing Liao
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
- Hospital of Stomatology, Department of Oral and Maxillofacial Surgery, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong Province, China
| | - Baoshan Xu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong Province, China
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Kalita E, Panda M, Rao A, Prajapati VK. Exploring the role of secretory proteins in the human infectious diseases diagnosis and therapeutics. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2023; 133:231-269. [PMID: 36707203 DOI: 10.1016/bs.apcsb.2022.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Secretory proteins are playing important role during the host-pathogen interaction to develop the infection or protection into the cell. Pathogens developing infectious disease to human being are taken up by host macrophages or number of immune cells, play an important role in physiological, developmental and immunological function. At the same time, infectious agents are also secreting various proteins to neutralize the resistance caused by host cells and also helping the pathogens to develop the infection. Secretory proteins (secretome) are only developed at the time of host-pathogen interaction, therefore they become very important to develop the targeted and potential therapeutic strategies. Pathogen specific secretory proteins released during interaction with host cell provide opportunity to develop point of care and rapid diagnostic kits. Proteins secreted by pathogens at the time of interaction with host cell have also been found as immunogenic in nature and numbers of vaccines have been developed to control the spread of human infectious diseases. This chapter highlights the importance of secretory proteins in the development of diagnostic and therapeutic strategies to fight against human infectious diseases.
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Affiliation(s)
- Elora Kalita
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - Mamta Panda
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - Abhishek Rao
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - Vijay Kumar Prajapati
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Ajmer, Rajasthan, India.
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Xu Z, Eichler B, Klausner EA, Duffy-Matzner J, Zheng W. Lead/Drug Discovery from Natural Resources. Molecules 2022; 27:8280. [PMID: 36500375 PMCID: PMC9736696 DOI: 10.3390/molecules27238280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/18/2022] [Accepted: 11/18/2022] [Indexed: 11/29/2022] Open
Abstract
Natural products and their derivatives have been shown to be effective drug candidates against various diseases for many years. Over a long period of time, nature has produced an abundant and prosperous source pool for novel therapeutic agents with distinctive structures. Major natural-product-based drugs approved for clinical use include anti-infectives and anticancer agents. This paper will review some natural-product-related potent anticancer, anti-HIV, antibacterial and antimalarial drugs or lead compounds mainly discovered from 2016 to 2022. Structurally typical marine bioactive products are also included. Molecular modeling, machine learning, bioinformatics and other computer-assisted techniques that are very important in narrowing down bioactive core structural scaffolds and helping to design new structures to fight against key disease-associated molecular targets based on available natural products are considered and briefly reviewed.
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Affiliation(s)
- Zhihong Xu
- Department of Chemistry and Biochemistry, Augustana University, 2001 S Summit Ave., Sioux Falls, SD 57197, USA
- Institute of Interventional & Vascular Surgery, Tongji University, Shanghai 200072, China
- Department of Pharmaceutical Sciences, South College School of Pharmacy, 400 Goody’s Lane, Knoxville, TN 37922, USA
| | - Barrett Eichler
- Department of Chemistry and Biochemistry, Augustana University, 2001 S Summit Ave., Sioux Falls, SD 57197, USA
| | - Eytan A. Klausner
- Department of Pharmaceutical Sciences, South College School of Pharmacy, 400 Goody’s Lane, Knoxville, TN 37922, USA
| | - Jetty Duffy-Matzner
- Department of Chemistry and Biochemistry, Augustana University, 2001 S Summit Ave., Sioux Falls, SD 57197, USA
| | - Weifan Zheng
- Biomanufacturing Research Institute and Technology Enterprise, North Carolina Central University, 1801 Fayetteville St., Durham, NC 27707, USA
- Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Ibrahim AO, Bello IS, Shabi OM, Omonijo AO, Ayodapo A, Afolabi BA. Malaria infection and its association with socio-demographics, preventive measures, and co-morbid ailments among adult febrile patients in rural Southwestern Nigeria: A cross-sectional study. SAGE Open Med 2022; 10:20503121221117853. [PMID: 36051785 PMCID: PMC9424889 DOI: 10.1177/20503121221117853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Accepted: 07/18/2022] [Indexed: 11/17/2022] Open
Abstract
Objectives: The study determined the prevalence of malaria infection and its association
with socio-demographics, environmental, housing, and co-morbid ailment
factors. Methods: The study was a cross-sectional of 330 consented adult febrile patients who
were recruited at a tertiary health facility in rural Southwestern Nigeria.
The standardized interviewer-administered questionnaire sought information
on their socio-demographics, environmental, housing, and co-morbid ailment
factors. Venous blood samples were collected and processed for malaria
parasite detection, retroviral screening, glycated hemoglobin, and
hemoglobinopathy. Data were analyzed using SPSS version 20. The strength of
the association between independent and dependent variables was measured
using odds ratio and 95% confidence interval with a significant level
(p value <0.05). Results: The prevalence of malaria parasitemia was 63.3% (95% confidence interval:
57.9%–68.5%). Being a farmer (p = 0.002), lack of formal
education (p = 0.043), low-income earners
(p = 0.031), presence of bushes
(p = 0.048), stagnant water (p = 0.042),
not sleeping under long-lasting insecticide-treated nets
(p < 0.001), and sickle cell disease
(p = 0.041) were significantly associated with malaria
infection. Conclusion: The study revealed that there is a high prevalence of malaria infection in
rural Southwestern Nigeria. There may be a need to pay greater attention to
adult populations in rural areas for malaria intervention and control
programs.
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Affiliation(s)
| | | | | | | | - Abayomi Ayodapo
- Department of Family Medicine, University College Hospital, Ibadan, Ibadan, Nigeria
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11
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Noreen N, Ullah A, Salman SM, Mabkhot Y, Alsayari A, Badshah SL. New insights into the spread of resistance to artemisinin and its analogues. J Glob Antimicrob Resist 2021; 27:142-149. [PMID: 34517141 DOI: 10.1016/j.jgar.2021.09.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 08/19/2021] [Accepted: 09/02/2021] [Indexed: 12/22/2022] Open
Abstract
Plasmodium falciparum, the causative agent of malaria, has been developing resistance to several drugs worldwide for more than five decades. Initially, resistance was against drugs such as chloroquine, pyrimethamine, sulfadoxine, mefloquine and quinine. Research studies are now reporting parasites with resistance to the most effective and novel drug used against malaria infection worldwide, namely artemisinin. For this reason, the first-line treatment strategy of artemisinin-based combination therapy is becoming unsuccessful in areas where drug resistance is highly prevalent. The increase in artemisinin-resistant P. falciparum strains has threatened international efforts to eliminate malarial infections and to reduce the disease burden. Detection of several phenotypes that display artemisinin resistance, specification of basic genetic factors, the discovery of molecular pathways, and evaluation of its clinical outcome are possible by the current series of research on genomics and transcriptomic levels in Asia and Africa. In artemisinin resistance, slow parasite clearance among malaria-infected patients and enhanced in vitro survival of parasites occurs at the early ring stage. This resistance is due to single nucleotide polymorphisms within the Kelch 13 gene of the parasite and is related to significantly upregulated resistance signalling pathways; thus, the pro-oxidant action of artemisinins can be antagonised. New strategies are required to halt the spread of artemisinin-resistant malarial parasites.
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Affiliation(s)
- Noreen Noreen
- Department of Chemistry, Islamia College University, Peshawar 25120, Pakistan
| | - Asad Ullah
- Department of Chemistry, Islamia College University, Peshawar 25120, Pakistan
| | | | - Yahia Mabkhot
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Khalid University, P.O. Box 960, Abha 61421, Saudi Arabia.
| | - Abdulrhman Alsayari
- Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Syed Lal Badshah
- Department of Chemistry, Islamia College University, Peshawar 25120, Pakistan.
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12
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Kumar S, Mina PR, Kumar R, Pal A, Ahmad A, Tandon S, Darokar MP. 4-Chlorothymol Exerts Antiplasmodial Activity Impeding Redox Defense System in Plasmodium falciparum. Front Pharmacol 2021; 12:628970. [PMID: 33776772 PMCID: PMC7988344 DOI: 10.3389/fphar.2021.628970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 01/13/2021] [Indexed: 11/13/2022] Open
Abstract
Malaria remains one of the major health concerns due to the resistance of Plasmodium species toward the existing drugs warranting an urgent need for new antimalarials. Thymol derivatives were known to exhibit enhanced antimicrobial activities; however, no reports were found against Plasmodium spp. In the present study, the antiplasmodial activity of thymol derivatives was evaluated against chloroquine-sensitive (NF-54) and -resistant (K1) strains of Plasmodium falciparum. Among the thymol derivatives tested, 4-chlorothymol showed potential activity against sensitive and resistant strains of P. falciparum. 4-Chlorothymol was found to increase the reactive oxygen species and reactive nitrogen species level. Furthermore, 4-chlorothymol could perturb the redox balance by modulating the enzyme activity of GST and GR. 4-Chlorothymol also showed synergy with chloroquine against chloroquine-resistant P. falciparum. 4-Chlorothymol was found to significantly suppress the parasitemia and increase the mean survival time in in vivo assays. Interestingly, in in vivo assay, 4-chlorothymol in combination with chloroquine showed higher chemosuppression as well as enhanced mean survival time at a much lower concentration as compared to individual doses of chloroquine and 4-chlorothymol. These observations clearly indicate the potential use of 4-chlorothymol as an antimalarial agent, which may also be effective in combination with the existing antiplasmodial drugs against chloroquine-resistant P. falciparum infection. In vitro cytotoxicity/hemolytic assay evidently suggests that 4-chlorothymol is safe for further exploration of its therapeutic properties.
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Affiliation(s)
- Saurabh Kumar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Pooja Rani Mina
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Ravi Kumar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Anirban Pal
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Ateeque Ahmad
- Process Chemistry and Technology Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Sudeep Tandon
- Process Chemistry and Technology Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Mahendra P Darokar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
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13
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Chen P, Yao Z, He Z. Resveratrol protects against high glucose-induced oxidative damage in human lens epithelial cells by activating autophagy. Exp Ther Med 2021; 21:440. [PMID: 33747177 PMCID: PMC7967869 DOI: 10.3892/etm.2021.9871] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 07/01/2020] [Indexed: 12/21/2022] Open
Abstract
In the pathogenesis of diabetic cataract, high glucose levels induce oxidative damage in human lens epithelial cells (HLECs). Resveratrol has been demonstrated to be a potent antioxidant in various disease conditions; however, limited information is available on its effects on oxidative damage associated with the pathogenesis of diabetic cataract in HLECs. The present study aimed to determine whether resveratrol prevents high glucose-induced oxidative damage to human lens epithelial cells by activating autophagy. In the present study, HLECs treated with high glucose were used as a cellular model of diabetic cataract and treated with resveratrol for 24 h. Flow cytometry was performed to detect the cellular reactive oxygen species (ROS) content. Autophagy marker protein levels were determined by western blotting. Immunofluorescence assay was performed to analyze in vitro microtubule-associated protein 1 light chain 3 β (LC3B) protein expression. Autophagosome formation in HLECs was observed using transmission electron microscopy. The results demonstrated that high glucose suppressed HLEC viability and proliferation rate compared with normal glucose levels (5 mM), which were significantly reversed by resveratrol treatment. High glucose also increased the ROS content compared with ROS content in normal HLECs, which was reduced following resveratrol treatment. Further experiments demonstrated that resveratrol significantly reversed the high glucose-decreased protein levels of LC3II and beclin-1 proteins and the high glucose-increased protein levels of LC3I and p62 in HLECs. In conclusion, resveratrol inhibited the high glucose-induced oxidative damage in HLECs by promoting autophagy through the activation of the p38 mitogen-activated protein kinase signaling pathway. These results provide a theoretical basis for the application of resveratrol in diabetic cataract prevention and treatment.
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Affiliation(s)
- Pengzhi Chen
- Department of Ophthalmology, The Affiliated Hospital of Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028006, P.R. China
| | - Zhenyu Yao
- Medical College, Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028006, P.R. China
| | - Zhihui He
- Medical College, Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028006, P.R. China
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14
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Fu R, Li J, Yu H, Zhang Y, Xu Z, Martin C. The Yin and Yang of traditional Chinese and Western medicine. Med Res Rev 2021; 41:3182-3200. [PMID: 33599314 DOI: 10.1002/med.21793] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 01/22/2023]
Abstract
The success of Western Scientific approaches to medicine, over the last 150 years, can be measured by substantial increases in life expectancy, reductions in infant mortality and the virtual elimination of many infectious diseases accompanied by development of effective management practices for noncommunicable diseases. However, major challenges remain in the form of infectious diseases that evolve resistance to pharmaceuticals rapidly, new diseases, particularly those caused by viruses and effective long-term treatments for chronic, noncommunicable diseases. Traditional Chinese Medicine (TCM) can offer complementary treatments based on personalised interventions, informed by knowledge accumulated from empirical observations gathered over centuries of practice, that address the impact of disease on the whole body. We provide examples of both infectious and noncommunicable diseases where the combination of Western Scientific Medicine (WSM) and TCM can benefit patients in terms of the speed and efficacy of recovery or disease management. TCM is a healing skill based on practice, while WSM is scientific, based on experiments. Against this background, an understanding of the mechanisms of action of traditional Chinese medicinal preparations will offer fresh routes to discovery and development of new therapeutics as well as patented medical prescriptions, which will rely heavily on modern scientific methodologies for their adoption and success, particularly those in plant genomics, plant breeding and synthetic biology.
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Affiliation(s)
- Rao Fu
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Jie Li
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich, UK
| | - Huatao Yu
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yang Zhang
- Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Zhihong Xu
- State Key Laboratory of Protein and Plant Gene Research, School of Life Science, Peking University, Beijing, China
| | - Cathie Martin
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich, UK
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15
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Webster J, Hoyt J, Diarra S, Manda-Taylor L, Okoth G, Achan J, Ghilardi L, D’Alessandro U, Madanista M, Kariuki S, Kayentao K, Hill J. Adoption of evidence-based global policies at the national level: intermittent preventive treatment for malaria in pregnancy and first trimester treatment in Kenya, Malawi, Mali and The Gambia. Health Policy Plan 2021; 35:1364-1375. [PMID: 33179027 PMCID: PMC7886437 DOI: 10.1093/heapol/czaa132] [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] [Accepted: 09/05/2020] [Indexed: 11/14/2022] Open
Abstract
In 2012, the World Health Organization (WHO) updated its policy on intermittent preventive treatment in pregnancy with sulphadoxine-pyrimethamine (IPTp-SP). A global recommendation to revise the WHO policy on the treatment of malaria in the first trimester is under review. We conducted a retrospective study of the national policy adoption process for revised IPTp-SP dosing in four sub-Saharan African countries. Alongside this retrospective study, we conducted a prospective policy adoption study of treatment of first trimester malaria with artemisinin combination therapies (ACTs). A document review informed development and interpretation of stakeholder interviews. An analytical framework was used to analyse data exploring stakeholder perceptions of the policies from 47 in-depth interviews with a purposively selected range of national level stakeholders. National policy adoption processes were categorized into four stages: (1) identify policy need; (2) review the evidence; (3) consult stakeholders and (4) endorse and draft policy. Actors at each stage were identified with the roles of evidence generation; technical advice; consultative and statutory endorsement. Adoption of the revised IPTp-SP policy was perceived to be based on strong evidence, support from WHO, consensus from stakeholders; and followed these stages. Poor tolerability of quinine was highlighted as a strong reason for a potential change in treatment policy. However, the evidence on safety of ACTs in the first trimester was considered weak. For some, trust in WHO was such that the anticipated announcement on the change in policy would allay these fears. For others, local evidence would first need to be generated to support a change in treatment policy. A national policy change from quinine to ACTs for the treatment of first trimester malaria will be less straightforward than experienced with increasing the IPTp dosing regimen despite following the same policy processes. Strong leadership will be needed for consultation and consensus building at national level.
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Affiliation(s)
- Jayne Webster
- Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St., London WC1E 7HT, UK
| | - Jenna Hoyt
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
| | - Samba Diarra
- Malaria Research and Training Centre, University of Sciences, Techniques, and Technologies of Bamako, Bamako BP: 1805, Mali
| | - Lucinda Manda-Taylor
- School of Public Health and Family Medicine, College of Medicine, University of Malawi, Private Bag 360, Chichiri, Blantyre 3, Malawi
| | - George Okoth
- Kenya Medical Research Institute/Centre for Global Health Research, Off Kisumu-Busia Road, PO Box 1578-4100 Kisumu, Kenya
| | - Jane Achan
- Medical Research Council Unit, The Gambia at the London School of Hygiene and Tropical Medicine, Atlantic Boulevard, Fajara, The Gambia
| | - Ludovica Ghilardi
- Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St., London WC1E 7HT, UK
| | - Umberto D’Alessandro
- Medical Research Council Unit, The Gambia at the London School of Hygiene and Tropical Medicine, Atlantic Boulevard, Fajara, The Gambia
| | - Mwayi Madanista
- School of Public Health and Family Medicine, College of Medicine, University of Malawi, Private Bag 360, Chichiri, Blantyre 3, Malawi
| | - Simon Kariuki
- Kenya Medical Research Institute/Centre for Global Health Research, Off Kisumu-Busia Road, PO Box 1578-4100 Kisumu, Kenya
| | - Kassoum Kayentao
- Malaria Research and Training Centre, University of Sciences, Techniques, and Technologies of Bamako, Bamako BP: 1805, Mali
| | - Jenny Hill
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
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16
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Anwar N, Ahmed NZ, Fathima AF, Begum S, Khan AA. Emergence of antimicrobial resistance and magnitude of Unani medicine - scope and challenges. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2021; 18:477-483. [PMID: 33544550 DOI: 10.1515/jcim-2020-0092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 07/08/2020] [Indexed: 11/15/2022]
Abstract
Emergence of antimicrobial resistance, with practically all newly developed and even more potent antibiotics like carbapenem and colistin, has become a matter of great public health concern. A number of common diseases of public health importance are becoming harder and sometimes impossible to treat due to increased resistance of pathogens. These alarming threats seek prime attention of scientific community to develop newer antibiotics with long-lasting efficacy, least side effects, and low economic burden. Unani classical texts have enormous citations on different infectious diseases. Many single drugs and compound formulations are in vogue since ages for the treatment of infectious diseases. Use of Afaviya (spices), Mufarrehat (exhilarants), Tiryaqi Advia (drugs with antidote properties) and Sirka (vinegar) is highly advocated in treating various infectious diseases. Though, enormous research activities have been undertaken worldwide to explore and develop newer antibiotics from natural resources, indicating massive magnitude of natural products in treating various infectious diseases, however, the higher plants, still largely seems to be unexplored. Moreover, elaborated and well controlled clinical studies are still lacking to authenticate their clinical significance. Hence, a rigorous, well-designed & well-structured research is highly paramount to ascertain the provision of newer, relatively safe and cost effective natural antibiotics.
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Affiliation(s)
- Noman Anwar
- Regional Research Institute of Unani Medicine, Chennai, Tamil Nadu, India
| | - N Zaheer Ahmed
- Regional Research Institute of Unani Medicine, Chennai, Tamil Nadu, India
| | - A Farhath Fathima
- Department of Ilm-us-Saidla, National Institute of Unani Medicine, Bangalore, Karnataka, India
| | - Shehnaz Begum
- Regional Research Institute of Unani Medicine, Chennai, Tamil Nadu, India
| | - Asim Ali Khan
- Central Council for Research in Unani Medicine, Ministry of AYUSH, Govt. of India, New Delhi, India
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17
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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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18
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Fomba S, Koné D, Doumbia B, Diallo D, Druetz T, Florey L, Eisele TP, Eckert E, Mihigo J, Ashton RA. Management of uncomplicated malaria among children under five years at public and private sector facilities in Mali. BMC Public Health 2020; 20:1888. [PMID: 33298011 PMCID: PMC7724888 DOI: 10.1186/s12889-020-09873-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 11/10/2020] [Indexed: 11/23/2022] Open
Abstract
Background Prompt and effective malaria diagnosis and treatment is a cornerstone of malaria control. Case management guidelines recommend confirmatory testing of suspected malaria cases, then prescription of specific drugs for uncomplicated malaria and for severe malaria. This study aims to describe case management practices for children aged 1–59 months seeking treatment with current or recent fever from public and private, rural and urban health providers in Mali. Methods Data were collected at sites in Sikasso Region and Bamako. Health workers recorded key information from the consultation including malaria diagnostic testing and result, their final diagnosis, and all drugs prescribed. Children with signs of severe diseases were ineligible. Consultations were not independently observed. Appropriate case management was defined as both 1) tested for malaria using rapid diagnostic test or microscopy, and 2) receiving artemisinin combination therapy (ACT) and no other antimalarials if test-positive, or receiving no antimalarials if test-negative. Results Of 1602 participating children, 23.7% were appropriately managed, ranging from 5.3% at public rural facilities to 48.4% at community health worker sites. The most common reason for ‘inappropriate’ management was lack of malaria diagnostic testing (50.4% of children). Among children with confirmed malaria, 50.8% received a non-ACT antimalarial (commonly artesunate injection or artemether), either alone or in combination with ACT. Of 215 test-negative children, 44.2% received an antimalarial drug, most commonly ACT. Prescription of multiple drugs was common: 21.7% of all children received more than one type of antimalarial, while 51.9% received an antibiotic and antimalarial. Inappropriate case management increased in children with increasing axillary temperatures and those seeking care over weekends. Conclusions Multiple limitations in management of febrile children under five were identified, including inconsistent use of confirmatory testing and apparent use of severe malaria drugs for uncomplicated malaria. While we cannot confirm the reasons for these shortcomings, there is a need to address the high use of non-ACT antimalarials in this context; to minimize potential for drug resistance, reduce unnecessary expense, and preserve life-saving treatment for severe malaria cases. These findings highlight the challenge of managing febrile illness in young children in a high transmission setting. Supplementary Information The online version contains supplementary material available at 10.1186/s12889-020-09873-1.
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Affiliation(s)
- Seydou Fomba
- Programme National de Lutte contre le Paludisme, Bamako, Mali
| | - Diakalia Koné
- Programme National de Lutte contre le Paludisme, Bamako, Mali
| | | | | | - Thomas Druetz
- Center for Applied Malaria Research and Evaluation, Tulane School of Public Health and Tropical Medicine, New Orleans, LA, USA.,Department of Social and Preventive Medicine, School of Public Health, University of Montreal, Montreal, QC, Canada
| | - Lia Florey
- President's Malaria Initiative, United States Agency for International Development, Washington, DC, USA
| | - Thomas P Eisele
- Center for Applied Malaria Research and Evaluation, Tulane School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Erin Eckert
- President's Malaria Initiative, United States Agency for International Development, Washington, DC, USA.,RTI International, Washington, DC, USA
| | - Jules Mihigo
- President's Malaria Initiative, United States Agency for International Development, Bamako, Mali
| | - Ruth A Ashton
- MEASURE Evaluation, Center for Applied Malaria Research and Evaluation, Tulane School of Public Health and Tropical Medicine, New Orleans, LA, USA.
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19
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Zhang H, Zhou F, Wang Y, Xie H, Luo S, Meng L, Su B, Ye Y, Wu K, Xu Y, Gong X. Eliminating Radiation Resistance of Non-Small Cell Lung Cancer by Dihydroartemisinin Through Abrogating Immunity Escaping and Promoting Radiation Sensitivity by Inhibiting PD-L1 Expression. Front Oncol 2020; 10:595466. [PMID: 33194761 PMCID: PMC7656009 DOI: 10.3389/fonc.2020.595466] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 09/16/2020] [Indexed: 12/18/2022] Open
Abstract
Radiation resistance is linked to immune escaping and radiation sensitivity. In this study, we found that the PD-L1 expressions of non-killed tumor cells in NSCLC were enhanced after radiotherapy, and dihydroartemisinin (DHA) could synergistically enhance the antitumor effect of radiotherapy in NSCLC. A total of 48 NSCLC patients with sufficient tumor tissues for further analyses were enrolled. The PD-L1 expressions of NSCLC were evaluated by immunohistochemistry. Cell apoptosis was measured by flow cytometry, and the relationship between the PD-L1 expression and radiation resistance was investigated in patient specimens, xenograft model, and cell lines. First, the results indicate that the PD-L1 expression of NSCLC was positively related with the radiation resistance. Second, we found that DHA could eliminate the radiation resistance and synergistically enhance the antitumor effect of radiotherapy in the NSCLC cells lines and xenograft model. Finally, mechanistically, DHA could inhibit the PD-L1 expression to avoid immune escaping by inhibiting TGF-β, PI3K/Akt, and STAT3 signaling pathways. In addition, DHA could activate TRIM21 and regulate the EMT-related proteins by inhibiting the PD-L1 so as to enhance the radiation sensitivity and eliminate radiation resistance to NSCLC. Collectively, this study established a basis for the rational design of integrated radiotherapy and DHA for the treatment of NSCLC.
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Affiliation(s)
- Hai Zhang
- Department of Pharmacy, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China
| | - Fei Zhou
- Department of Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yingying Wang
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Huikang Xie
- Department of Pathology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shilan Luo
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Lu Meng
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Bin Su
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Ying Ye
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Kailiang Wu
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Yaping Xu
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiaomei Gong
- Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
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A Study of Synergy of Combination of Eosin B with Chloroquine, Artemisinin, and Sulphadoxine-Pyrimethamine on Plasmodium falciparum In Vitro and Plasmodium berghei In Vivo. J Trop Med 2020; 2020:3013701. [PMID: 32565830 PMCID: PMC7285249 DOI: 10.1155/2020/3013701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 04/20/2020] [Indexed: 01/06/2023] Open
Abstract
Methods Drug assessment was carried out singly or in combination on Plasmodium falciparum in vitro using the candle jar method at three inhibitory concentrations. Percent parasitemia of live cells was obtained by microscopic counting. Peter's suppression test was carried out on mice infected with Plasmodium berghei after 3 administration of the drugs singly and in combination, and parasites were counted by microscopy for 10 days. Results Synergy was exhibited by isobolograms of eosin B combined with artesunate and sulphadoxine-pyrimethamine with more than 10 fold reduction of all drugs in vitro. A good combination index was obtained with artesunate at 50% inibitory concentration with 3.4 nM eosin B and 1.7 nM artesunate in contrast to 124 nM eosin B and 7.6 nM artesunate singly. In vivo studies also showed a considerable lowering of the effective dose of eosin B 30 mg/kg: artesunate 3 mg/kg with 200 mg/kg eosin B and 60 mg/kg artesunate separately. Sulphadoxine-pyrimethamine seemed to have the greatest synergistic effect with a combination index of 0.007, but this could be due to it consisting of a combination of three drugs. Eosin B's combination index with chloroquine was fair, and in vivo tests too did not show as much competence as the other two drugs. Conclusion and Interpretation. It can be concluded that eosin B can be used in combination with antimalarial drugs with favorable results.
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Nyamai DW, Tastan Bishop Ö. Identification of Selective Novel Hits against Plasmodium falciparum Prolyl tRNA Synthetase Active Site and a Predicted Allosteric Site Using in silico Approaches. Int J Mol Sci 2020; 21:E3803. [PMID: 32471245 PMCID: PMC7312540 DOI: 10.3390/ijms21113803] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/10/2020] [Accepted: 05/19/2020] [Indexed: 12/14/2022] Open
Abstract
Recently, there has been increased interest in aminoacyl tRNA synthetases (aaRSs) as potential malarial drug targets. These enzymes play a key role in protein translation by the addition of amino acids to their cognate tRNA. The aaRSs are present in all Plasmodium life cycle stages, and thus present an attractive malarial drug target. Prolyl tRNA synthetase is a class II aaRS that functions in charging tRNA with proline. Various inhibitors against Plasmodium falciparum ProRS (PfProRS) active site have been designed. However, none have gone through clinical trials as they have been found to be highly toxic to human cells. Recently, a possible allosteric site was reported in PfProRS with two possible allosteric modulators: glyburide and TCMDC-124506. In this study, we sought to identify novel selective inhibitors targeting PfProRS active site and possible novel allosteric modulators of this enzyme. To achieve this, virtual screening of South African natural compounds against PfProRS and the human homologue was carried out using AutoDock Vina. The modulation of protein motions by ligand binding was studied by molecular dynamics (MD) using the GROningen MAchine for Chemical Simulations (GROMACS) tool. To further analyse the protein global motions and energetic changes upon ligand binding, principal component analysis (PCA), and free energy landscape (FEL) calculations were performed. Further, to understand the effect of ligand binding on the protein communication, dynamic residue network (DRN) analysis of the MD trajectories was carried out using the MD-TASK tool. A total of ten potential natural hit compounds were identified with strong binding energy scores. Binding of ligands to the protein caused observable global and residue level changes. Dynamic residue network calculations showed increase in betweenness centrality (BC) metric of residues at the allosteric site implying these residues are important in protein communication. A loop region at the catalytic domain between residues 300 and 350 and the anticodon binding domain showed significant contributions to both PC1 and PC2. Large motions were observed at a loop in the Z-domain between residues 697 and 710 which was also in agreement with RMSF calculations that showed increase in flexibility of residues in this region. Residues in this loop region are implicated in ATP binding and thus a change in dynamics may affect ATP binding affinity. Free energy landscape (FEL) calculations showed that the holo protein (protein-ADN complex) and PfProRS-SANC184 complexes were stable, as shown by the low energy with very few intermediates and hardly distinguishable low energy barriers. In addition, FEL results agreed with backbone RMSD distribution plots where stable complexes showed a normal RMSD distribution while unstable complexes had multimodal RMSD distribution. The betweenness centrality metric showed a loss of functional importance of key ATP binding site residues upon allosteric ligand binding. The deep basins in average L observed at the allosteric region imply that there is high accessibility of residues at this region. To further analyse BC and average L metrics data, we calculated the ΔBC and ΔL values by taking each value in the holo protein BC or L matrix less the corresponding value in the ligand-bound complex BC or L matrix. Interestingly, in allosteric complexes, residues located in a loop region implicated in ATP binding had negative ΔL values while in orthosteric complexes these residues had positive ΔL values. An increase in contact frequency between residues Ser263, Thr267, Tyr285, and Leu707 at the allosteric site and residues Thr397, Pro398, Thr402, and Gln395 at the ATP binding TXE loop was observed. In summary, this study identified five potential orthosteric inhibitors and five allosteric modulators against PfProRS. Allosteric modulators changed ATP binding site dynamics, as shown by RMSF, PCA, and DRN calculations. Changes in dynamics of the ATP binding site and increased contact frequency between residues at the proposed allosteric site and the ATP binding site may explain how allosteric modulators distort the ATP binding site and thus might inhibit PfProRS. The scaffolds of the identified hits in the study can be used as a starting point for antimalarial inhibitor development with low human cytotoxicity.
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Affiliation(s)
| | - Özlem Tastan Bishop
- Research Unit in Bioinformatics (RUBi), Department of Biochemistry and Microbiology, Rhodes University, Grahamstown 6140, South Africa;
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Tiwari MK, Chaudhary S. Artemisinin-derived antimalarial endoperoxides from bench-side to bed-side: Chronological advancements and future challenges. Med Res Rev 2020; 40:1220-1275. [PMID: 31930540 DOI: 10.1002/med.21657] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/21/2019] [Accepted: 12/17/2019] [Indexed: 12/14/2022]
Abstract
According to WHO World Malaria Report (2018), nearly 219 million new cases of malaria occurred and a total no. of 435 000 people died in 2017 due to this infectious disease. This is due to the rapid spread of parasite-resistant strains. Artemisinin (ART), a sesquiterpene lactone endoperoxide isolated from traditional Chinese herb Artemisia annua, has been recognized as a novel class of antimalarial drugs. The 2015 "Nobel Prize in Physiology or Medicine" was given to Prof Dr Tu Youyou for the discovery of ART. Hence, ART is termed as "Nobel medicine." The present review article accommodates insights from the chronological advancements and direct statistics witnessed during the past 48 years (1971-2019) in the medicinal chemistry of ART-derived antimalarial endoperoxides, and their clinical utility in malaria chemotherapy and drug discovery.
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Affiliation(s)
- Mohit K Tiwari
- Laboratory of Organic and Medicinal Chemistry, Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, India
| | - Sandeep Chaudhary
- Laboratory of Organic and Medicinal Chemistry, Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, India
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Mansour E, Aboelnaga A, Nassar EM, Elewa SI. A new series of thiazolyl pyrazoline derivatives linked to benzo[1,3]dioxole moiety: Synthesis and evaluation of antimicrobial and anti-proliferative activities. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1695839] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Eman Mansour
- Organic Chemistry Department, Faculty of Women’s for Arts, Science and Education, Ain Shams University, Cairo, Egypt
| | - Asmaa Aboelnaga
- Organic Chemistry Department, Faculty of Women’s for Arts, Science and Education, Ain Shams University, Cairo, Egypt
| | - Ekhlass M. Nassar
- Organic Chemistry Department, Faculty of Women’s for Arts, Science and Education, Ain Shams University, Cairo, Egypt
| | - Safaa I. Elewa
- Organic Chemistry Department, Faculty of Women’s for Arts, Science and Education, Ain Shams University, Cairo, Egypt
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Sharifi A, Azizi M, Moradi-Choghakabodi P, Aghaei S, Azizi A. In vitro anti-Helicobacter pylori activity of aqueous extract from Persian Oak testa. CHINESE HERBAL MEDICINES 2019. [DOI: 10.1016/j.chmed.2019.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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Tiwari MK, Yadav DK, Chaudhary S. Recent Developments in Natural Product Inspired Synthetic 1,2,4- Trioxolanes (Ozonides): An Unusual Entry into Antimalarial Chemotherapy. Curr Top Med Chem 2019; 19:831-846. [DOI: 10.2174/1568026619666190412104042] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 03/11/2019] [Accepted: 03/14/2019] [Indexed: 11/22/2022]
Abstract
According to WHO “World health statistics 2018”, malaria alongside acute respiratory infections
and diarrhoea, is one of the major infectious disease causing children’s death in between the
age of 1-5 years. Similarly, according to another report (2016) malaria accounts for approximately
3.14% of the total disease burden worldwide. Although malaria has been widely eradicated in many
parts of the world, the global number of cases continues to rise due to the rapid spread of malaria parasites
that are resistant to antimalarial drugs. Artemisinin (8), a major breakthrough in the antimalarial
chemotherapy was isolated from the plant Artemisia annua in 1972. Its semi-synthetic derivatives such
as artemether (9), arteether (10), and artesunic acid (11) are quite effective against multi-drug resistant
malaria strains and are currently the drug of choice for the treatment of malaria. Inspite of exhibiting
excellent antimalarial activity by artemisinin (8) and its derivatives, parallel programmes for the discovery
of novel natural and synthetic peroxides were also the area of investigation of medicinal chemists
all over the world. In these continuous efforts of extensive research, natural ozonide (1,2,4-
trioxolane) was isolated from Adiantum monochlamys (Pteridaceae) and Oleandra wallichii (Davalliaceae)
in 1976. These naturally occurring stable ozonides inspired chemists to investigate this novel
class for antimalarial chemotherapy. The first identification of unusually stable synthetic antimalarial
1,2,4-trioxolanes was reported in 1992. Thus, an unusual entry of ozonides in the field of antimalarial
chemotherapy had occurred in the early nineties. This review highlights the recent advancements and
historical developments observed during the past 42 years (1976-2018) focusing mainly on important
ventures of the antimalarial 1,2,4-trioxolanes (ozonides).
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Affiliation(s)
- Mohit K. Tiwari
- Laboratory of Organic and Medicinal Chemistry, Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jawaharlal Nehru Marg, Jaipur-302017, India
| | - Dharmendra K. Yadav
- College of Pharmacy, Gachon University of Medicine and Science, Hambakmoeiro 191, Yeonsu-gu, Incheon city, 406-799, Korea
| | - Sandeep Chaudhary
- Laboratory of Organic and Medicinal Chemistry, Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jawaharlal Nehru Marg, Jaipur-302017, India
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Shaffer JG, Mather FJ, Wele M, Li J, Tangara CO, Kassogue Y, Srivastav SK, Thiero O, Diakite M, Sangare M, Dabitao D, Toure M, Djimde AA, Traore S, Diakite B, Coulibaly MB, Liu Y, Lacey M, Lefante JJ, Koita O, Schieffelin JS, Krogstad DJ, Doumbia SO. Expanding Research Capacity in Sub-Saharan Africa Through Informatics, Bioinformatics, and Data Science Training Programs in Mali. Front Genet 2019; 10:331. [PMID: 31031807 PMCID: PMC6473184 DOI: 10.3389/fgene.2019.00331] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 03/28/2019] [Indexed: 12/04/2022] Open
Abstract
Bioinformatics and data science research have boundless potential across Africa due to its high levels of genetic diversity and disproportionate burden of infectious diseases, including malaria, tuberculosis, HIV and AIDS, Ebola virus disease, and Lassa fever. This work lays out an incremental approach for reaching underserved countries in bioinformatics and data science research through a progression of capacity building, training, and research efforts. Two global health informatics training programs sponsored by the Fogarty International Center (FIC) were carried out at the University of Sciences, Techniques and Technologies of Bamako, Mali (USTTB) between 1999 and 2011. Together with capacity building efforts through the West Africa International Centers of Excellence in Malaria Research (ICEMR), this progress laid the groundwork for a bioinformatics and data science training program launched at USTTB as part of the Human Heredity and Health in Africa (H3Africa) initiative. Prior to the global health informatics training, its trainees published first or second authorship and third or higher authorship manuscripts at rates of 0.40 and 0.10 per year, respectively. Following the training, these rates increased to 0.70 and 1.23 per year, respectively, which was a statistically significant increase (p < 0.001). The bioinformatics and data science training program at USTTB commenced in 2017 focusing on student, faculty, and curriculum tiers of enhancement. The program's sustainable measures included institutional support for core elements, university tuition and fees, resource sharing and coordination with local research projects and companion training programs, increased student and faculty publication rates, and increased research proposal submissions. Challenges reliance of high-speed bandwidth availability on short-term funding, lack of a discounted software portal for basic software applications, protracted application processes for United States visas, lack of industry job positions, and low publication rates in the areas of bioinformatics and data science. Long-term, incremental processes are necessary for engaging historically underserved countries in bioinformatics and data science research. The multi-tiered enhancement approach laid out here provides a platform for generating bioinformatics and data science technicians, teachers, researchers, and program managers. Increased literature on bioinformatics and data science training approaches and progress is needed to provide a framework for establishing benchmarks on the topics.
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Affiliation(s)
- Jeffrey G. Shaffer
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Frances J. Mather
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Mamadou Wele
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Jian Li
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Cheick Oumar Tangara
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Yaya Kassogue
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Sudesh K. Srivastav
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Oumar Thiero
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Mahamadou Diakite
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Modibo Sangare
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Djeneba Dabitao
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Mahamoudou Toure
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Abdoulaye A. Djimde
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Sekou Traore
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Brehima Diakite
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Mamadou B. Coulibaly
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Yaozhong Liu
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Michelle Lacey
- Department of Mathematics, Tulane University, New Orleans, LA, United States
| | - John J. Lefante
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Ousmane Koita
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - John S. Schieffelin
- Sections of Pediatric & Adult Infectious Diseases, School of Medicine, Tulane University, New Orleans, LA, United States
| | - Donald J. Krogstad
- Department of Global Biostatistics and Data Science, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, United States
| | - Seydou O. Doumbia
- Faculty of Medicine and Odontostomatology, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
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Ristroph KD, Feng J, McManus SA, Zhang Y, Gong K, Ramachandruni H, White CE, Prud'homme RK. Spray drying OZ439 nanoparticles to form stable, water-dispersible powders for oral malaria therapy. J Transl Med 2019; 17:97. [PMID: 30902103 PMCID: PMC6431012 DOI: 10.1186/s12967-019-1849-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 03/15/2019] [Indexed: 12/18/2022] Open
Abstract
Background OZ439 is a new chemical entity which is active against drug-resistant malaria and shows potential as a single-dose cure. However, development of an oral formulation with desired exposure has proved problematic, as OZ439 is poorly soluble (BCS Class II drug). In order to be feasible for low and middle income countries (LMICs), any process to create or formulate such a therapeutic must be inexpensive at scale, and the resulting formulation must survive without refrigeration even in hot, humid climates. We here demonstrate the scalability and stability of a nanoparticle (NP) formulation of OZ439. Previously, we applied a combination of hydrophobic ion pairing and Flash NanoPrecipitation (FNP) to formulate OZ439 NPs 150 nm in diameter using the inexpensive stabilizer hydroxypropyl methylcellulose acetate succinate (HPMCAS). Lyophilization was used to process the NPs into a dry form, and the powder’s in vitro solubilization was over tenfold higher than unprocessed OZ439. Methods In this study, we optimize our previous formulation using a large-scale multi-inlet vortex mixer (MIVM). Spray drying is a more scalable and less expensive operation than lyophilization and is, therefore, optimized to produce dry powders. The spray dried powders are then subjected to a series of accelerated aging stability trials at high temperature and humidity conditions. Results The spray dried OZ439 powder’s dissolution kinetics are superior to those of lyophilized NPs. The powder’s OZ439 solubilization profile remains constant after 1 month in uncapped vials in an oven at 50 °C and 75% RH, and for 6 months in capped vials at 40 °C and 75% RH. In fasted-state intestinal fluid, spray dried NPs achieved 80–85% OZ439 dissolution, to a concentration of 430 µg/mL, within 3 h. In fed-state intestinal fluid, 95–100% OZ439 dissolution is achieved within 1 h, to a concentration of 535 µg/mL. X-ray powder diffraction and differential scanning calorimetry profiles similarly remain constant over these periods. Conclusions The combined nanofabrication and drying process described herein, which utilizes two continuous unit operations that can be operated at scale, is an important step toward an industrially-relevant method of formulating the antimalarial OZ439 into a single-dose oral form with good stability against humidity and temperature. Electronic supplementary material The online version of this article (10.1186/s12967-019-1849-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kurt D Ristroph
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08854, USA
| | - Jie Feng
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08854, USA
| | - Simon A McManus
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08854, USA
| | - Yingyue Zhang
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08854, USA
| | - Kai Gong
- Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08854, USA.,Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, 08854, USA
| | - Hanu Ramachandruni
- Medicines for Malaria Venture, Route de Pré-Bois 20, 1215, Meyrin, Switzerland
| | - Claire E White
- Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08854, USA.,Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, 08854, USA
| | - Robert K Prud'homme
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08854, USA.
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Nyamai DW, Tastan Bishop Ö. Aminoacyl tRNA synthetases as malarial drug targets: a comparative bioinformatics study. Malar J 2019; 18:34. [PMID: 30728021 PMCID: PMC6366043 DOI: 10.1186/s12936-019-2665-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 01/27/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Treatment of parasitic diseases has been challenging due to evolution of drug resistant parasites, and thus there is need to identify new class of drugs and drug targets. Protein translation is important for survival of malarial parasite, Plasmodium, and the pathway is present in all of its life cycle stages. Aminoacyl tRNA synthetases are primary enzymes in protein translation as they catalyse amino acid addition to the cognate tRNA. This study sought to understand differences between Plasmodium and human aminoacyl tRNA synthetases through bioinformatics analysis. METHODS Plasmodium berghei, Plasmodium falciparum, Plasmodium fragile, Plasmodium knowlesi, Plasmodium malariae, Plasmodium ovale, Plasmodium vivax, Plasmodium yoelii and human aminoacyl tRNA synthetase sequences were retrieved from UniProt database and grouped into 20 families based on amino acid specificity. These families were further divided into two classes. Both families and classes were analysed. Motif discovery was carried out using the MEME software, sequence identity calculation was done using an in-house Python script, multiple sequence alignments were performed using PROMALS3D and TCOFFEE tools, and phylogenetic tree calculations were performed using MEGA vs 7.0 tool. Possible alternative binding sites were predicted using FTMap webserver and SiteMap tool. RESULTS Motif discovery revealed Plasmodium-specific motifs while phylogenetic tree calculations showed that Plasmodium proteins have different evolutionary history to the human homologues. Human aaRSs sequences showed low sequence identity (below 40%) compared to Plasmodium sequences. Prediction of alternative binding sites revealed potential druggable sites in PfArgRS, PfMetRS and PfProRS at regions that are weakly conserved when compared to the human homologues. Multiple sequence analysis, motif discovery, pairwise sequence identity calculations and phylogenetic tree analysis showed significant differences between parasite and human aaRSs proteins despite functional and structural conservation. These differences may provide a basis for further exploration of Plasmodium aminoacyl tRNA synthetases as potential drug targets. CONCLUSION This study showed that, despite, functional and structural conservation, Plasmodium aaRSs have key differences from the human homologues. These differences in Plasmodium aaRSs can be targeted to develop anti-malarial drugs with less toxicity to the host.
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Affiliation(s)
- Dorothy Wavinya Nyamai
- Research Unit in Bioinformatics (RUBi), Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, 6140, South Africa
| | - Özlem Tastan Bishop
- Research Unit in Bioinformatics (RUBi), Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, 6140, South Africa.
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Funck-Brentano C, Ouologuem N, Duparc S, Felices M, Sirima SB, Sagara I, Soulama I, Ouedraogo JB, Beavogui AH, Borghini-Fuhrer I, Khan Y, Djimdé AA, Voiriot P. Evaluation of the effects on the QT-interval of 4 artemisinin-based combination therapies with a correction-free and heart rate-free method. Sci Rep 2019; 9:883. [PMID: 30696921 PMCID: PMC6351684 DOI: 10.1038/s41598-018-37113-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 12/04/2018] [Indexed: 12/04/2022] Open
Abstract
Several antimalarial drugs are known to prolong ventricular repolarization as evidenced by QT/QTc interval prolongation. This can lead to Torsades de Pointes, a potentially lethal ventricular arrhythmia. Whether this is the case with artemisinin-based combination therapies (ACTs) remains uncertain. Assessment of the extent of QTc prolongation with antimalarials is hampered by important variations of heart rate during malaria crises and previous studies have reported highly variable values of QTc prolongations with ACTs. We assessed QTc prolongation with four ACTs, using high quality ECG recording and measurement techniques, during the first episode of malaria in 2,091 African patients enrolled in the WANECAM study which also monitored clinical safety. Using an original and robust method of QTc assessment, independent from heart rate changes and from the method of QT correction, we were able to accurately assess the extent of mean maximum QTc prolongation with the four ACTs tested. There was no evidence of proarrhythmia with any treatment during the study although dihydroartemisinin-piperaquine, artesunate-amodiaquine and artemether-lumefantrine significantly prolonged QTc. The extent of prolongation of ventricular repolarization can be accurately assessed in studies where heart rate changes impede QTc assessment.
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Affiliation(s)
- Christian Funck-Brentano
- INSERM, CIC-1421 and UMR ICAN 1166, Sorbonne Université, Faculty of Medicine, AP-HP, Pitié-Salpêtrière Hospital, Department of Pharmacology and Clinical Investigation Center, Institute of Cardiometabolism and Nutrition (ICAN), F-75013, Paris, France.
| | - Nouhoum Ouologuem
- Malaria research and training center. Département d'épidémiologie des affections parasitaires, Faculté de médecine de pharmacie et d'odonto-stomatologie. P.O. Box 1805, Point G, Bamako, Mali
| | - Stephan Duparc
- Medicines for Malaria Venture, International Center Cointrin, 20 route de Pré-Bois, 1215, Geneva 15, Switzerland
| | - Mathieu Felices
- Phinc Development, Immeuble Genavenir 8, 5 rue Henri Desbruères, 91030, Evry Cedex, France
| | - Sodiomon B Sirima
- Centre national de recherche et de formation sur le paludisme, 01 P.O. Box 2208, Ouagadougou 01, Burkina Faso
| | - Issaka Sagara
- Malaria research and training center. Département d'épidémiologie des affections parasitaires, Faculté de médecine de pharmacie et d'odonto-stomatologie. P.O. Box 1805, Point G, Bamako, Mali
| | - Issiaka Soulama
- Centre national de recherche et de formation sur le paludisme, 01 P.O. Box 2208, Ouagadougou 01, Burkina Faso
| | - Jean-Bosco Ouedraogo
- IRSS, Direction Régionale de l'Ouest, 399, Avenue de la Liberté 01, P.O. Box 545, Bobo-Dioulasso 01, Burkina Faso
| | - Abdoul H Beavogui
- Centre National de Formation et de Recherche en Santé Rurale de Mafèrinyah, P.O. Box 2649, Conakry, Guinea
| | - Isabelle Borghini-Fuhrer
- Medicines for Malaria Venture, International Center Cointrin, 20 route de Pré-Bois, 1215, Geneva 15, Switzerland
| | - Yasmin Khan
- Cardiabase, 84 avenue du XXème Corps, 54000, Nancy, France
| | - Abdoulaye A Djimdé
- Malaria research and training center. Département d'épidémiologie des affections parasitaires, Faculté de médecine de pharmacie et d'odonto-stomatologie. P.O. Box 1805, Point G, Bamako, Mali
| | - Pascal Voiriot
- Cardiabase, 84 avenue du XXème Corps, 54000, Nancy, France
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Kumari A, Karnatak M, Singh D, Shankar R, Jat JL, Sharma S, Yadav D, Shrivastava R, Verma VP. Current scenario of artemisinin and its analogues for antimalarial activity. Eur J Med Chem 2018; 163:804-829. [PMID: 30579122 DOI: 10.1016/j.ejmech.2018.12.007] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 11/29/2018] [Accepted: 12/02/2018] [Indexed: 11/17/2022]
Abstract
Human malaria, one of the most striking, reemerging infectious diseases, is caused by several types of Plasmodium parasites. Whilst advances have been made in lowering the numbers of cases and deaths, it is clear that a strategy based solely on disease control year on year, without reducing transmission and ultimately eradicating the parasite, is unsustainable. Natural products have served as a template for the design and development of antimalarial drugs currently in the clinic or in the development phase. Artemisinin combine potent, rapid antimalarial activity with a wide therapeutic index and an absence of clinically important resistance. The alkylating ability of artemisinin and its semi-synthetic analogues toward heme related to their antimalarial efficacy are underlined. Although impressive results have already been achieved in malaria research, more systematization and concentration of efforts are required if real breakthroughs are to be made. This review will concisely cover the clinical, preclinical antimalarial and current updates in artemisinin based antimalarial drugs. Diverse classes of semi-synthetic analogs of artemisinin reported in the last decade have also been extensively studied. The experience gained in this respect is discussed.
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Affiliation(s)
- Akriti Kumari
- Department of Chemistry, Banasthali University, Banasthali Newai, 304022, Rajasthan, India
| | - Manvika Karnatak
- Department of Chemistry, Banasthali University, Banasthali Newai, 304022, Rajasthan, India
| | - Davinder Singh
- Bio-Organic Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, Jammu and Kashmir, India
| | - Ravi Shankar
- Bio-Organic Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, Jammu and Kashmir, India
| | - Jawahar L Jat
- Department of Applied Chemistry, BabaSaheb Bhimrao Ambedkar University (A Central University), Vidya Vihar Raebareli Road, Lucknow, 226025, India
| | - Siddharth Sharma
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur, 313001, India
| | - Dinesh Yadav
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur, 313001, India
| | - Rahul Shrivastava
- Department of Chemistry, Manipal University Jaipur, Jaipur, 303007, India
| | - Ved Prakash Verma
- Department of Chemistry, Banasthali University, Banasthali Newai, 304022, Rajasthan, India.
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Emerging Southeast Asian PfCRT mutations confer Plasmodium falciparum resistance to the first-line antimalarial piperaquine. Nat Commun 2018; 9:3314. [PMID: 30115924 PMCID: PMC6095916 DOI: 10.1038/s41467-018-05652-0] [Citation(s) in RCA: 165] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 07/11/2018] [Indexed: 11/16/2022] Open
Abstract
The widely used antimalarial combination therapy dihydroartemisinin + piperaquine (DHA + PPQ) has failed in Cambodia. Here, we perform a genomic analysis that reveals a rapid increase in the prevalence of novel mutations in the Plasmodium falciparum chloroquine resistance transporter PfCRT following DHA + PPQ implementation. These mutations occur in parasites harboring the K13 C580Y artemisinin resistance marker. By introducing PfCRT mutations into sensitive Dd2 parasites or removing them from resistant Cambodian isolates, we show that the H97Y, F145I, M343L, or G353V mutations each confer resistance to PPQ, albeit with fitness costs for all but M343L. These mutations sensitize Dd2 parasites to chloroquine, amodiaquine, and quinine. In Dd2 parasites, multicopy plasmepsin 2, a candidate molecular marker, is not necessary for PPQ resistance. Distended digestive vacuoles were observed in pfcrt-edited Dd2 parasites but not in Cambodian isolates. Our findings provide compelling evidence that emerging mutations in PfCRT can serve as a molecular marker and mediator of PPQ resistance. Increasing resistance of Plasmodium falciparum strains to piperaquine (PPQ) in Southeast Asia is of concern and resistance mechanisms are incompletely understood. Here, Ross et al. show that mutations in the P. falciparum chloroquine resistance transporter are rapidly increasing in prevalence in Cambodia and confer resistance to PPQ.
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Douine M, Lazrek Y, Blanchet D, Pelleau S, Chanlin R, Corlin F, Hureau L, Volney B, Hiwat H, Vreden S, Djossou F, Demar M, Nacher M, Musset L. Predictors of antimalarial self-medication in illegal gold miners in French Guiana: a pathway towards artemisinin resistance. J Antimicrob Chemother 2018; 73:231-239. [PMID: 29045645 DOI: 10.1093/jac/dkx343] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 08/23/2017] [Indexed: 11/15/2022] Open
Abstract
Background Malaria is endemic in French Guiana (FG), South America. Despite the decrease in cases in the local population, illegal gold miners are very affected by malaria (22.3% of them carried Plasmodium spp.). Self-medication seems to be very common, but its modalities and associated factors have not been studied. The aim of this study was to evaluate parasite susceptibility to drugs and to document behaviours that could contribute to resistance selection in illegal gold miners. Methods This multicentric cross-sectional study was conducted in resting sites along the FG-Surinamese border. Participating gold miners working in FG completed a questionnaire and provided a blood sample. Results From January to June 2015, 421 illegal gold miners were included. Most were Brazilian (93.8%) and 70.5% were male. During the most recent malaria attack, 45.5% reported having been tested for malaria and 52.4% self-medicated, mainly with artemisinin derivatives (90%). Being in FG during the last malaria attack was the main factor associated with self-medication (adjusted OR = 22.1). This suggests that access to malaria diagnosis in FG is particularly difficult for Brazilian illegal gold miners. Treatment adherence was better for persons who reported being tested. None of the 32 samples with Plasmodium falciparum presented any mutation on the pfK13 gene, but one isolate showed a resistance profile to artemisinin derivatives in vitro. Conclusions The risk factors for the selection of resistance are well known and this study showed that they are present in FG with persons who self-medicated with poor adherence. Interventions should be implemented among this specific population to avoid the emergence of artemisinin resistance.
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Affiliation(s)
- M Douine
- Centre d'Investigation Clinique Antilles-Guyane (Inserm 1424), Cayenne Hospital, French Guiana.,Epidemiology of Tropical Parasitoses, EA 3593, Université de Guyane, Cayenne, French Guiana
| | - Y Lazrek
- Laboratoire de Parasitologie, WHO Collaborating Center for Surveillance of Anti-Malarial Drug Resistance, Centre National de Référence du Paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana
| | - D Blanchet
- Academic Laboratory of Parasitology - Mycology, Cayenne Hospital, Cayenne, French Guiana
| | - S Pelleau
- Laboratoire de Parasitologie, WHO Collaborating Center for Surveillance of Anti-Malarial Drug Resistance, Centre National de Référence du Paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana
| | - R Chanlin
- Academic Laboratory of Parasitology - Mycology, Cayenne Hospital, Cayenne, French Guiana
| | - F Corlin
- Centre d'Investigation Clinique Antilles-Guyane (Inserm 1424), Cayenne Hospital, French Guiana
| | - L Hureau
- Centre d'Investigation Clinique Antilles-Guyane (Inserm 1424), Cayenne Hospital, French Guiana
| | - B Volney
- Laboratoire de Parasitologie, WHO Collaborating Center for Surveillance of Anti-Malarial Drug Resistance, Centre National de Référence du Paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana
| | - H Hiwat
- Ministry of Health, Malaria Program, Paramaribo, Suriname
| | - S Vreden
- Foundation for Scientific Research Suriname (SWOS), Paramaribo, Suriname
| | - F Djossou
- Epidemiology of Tropical Parasitoses, EA 3593, Université de Guyane, Cayenne, French Guiana.,Infectious and Tropical Diseases Department, Cayenne Hospital, Cayenne, French Guiana
| | - M Demar
- Epidemiology of Tropical Parasitoses, EA 3593, Université de Guyane, Cayenne, French Guiana.,Academic Laboratory of Parasitology - Mycology, Cayenne Hospital, Cayenne, French Guiana
| | - M Nacher
- Centre d'Investigation Clinique Antilles-Guyane (Inserm 1424), Cayenne Hospital, French Guiana.,Epidemiology of Tropical Parasitoses, EA 3593, Université de Guyane, Cayenne, French Guiana
| | - L Musset
- Laboratoire de Parasitologie, WHO Collaborating Center for Surveillance of Anti-Malarial Drug Resistance, Centre National de Référence du Paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana
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A Review of Pharmacogenetics of Antimalarials and Associated Clinical Implications. Eur J Drug Metab Pharmacokinet 2018; 42:745-756. [PMID: 28070879 DOI: 10.1007/s13318-016-0399-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Genetic variability in drug-metabolizing enzymes and drug transporters is known to influence the pharmacokinetics of many drugs. Antimalarial drugs are a class of agents known to utilize metabolic and elimination pathways prone to genetic variation. This paper aims to review the genetic variants affecting antimalarial medications and discuss their clinical implications. Data were identified for the genes coding for the cytochrome P450 (CYP) enzymes: CYP2C8, CYP2C19, CYP2A6, CYP2D6, CYP2B6, and the P-glycoprotein drug transporter. Adverse effects of amodiaquine were more common in patients with decreased CYP2C8 metabolism. CYP2C19 variants influenced the metabolism of proguanil but no differences in efficacy outcomes were observed. Ultra-metabolizers of CYP2A6 showed increased incidence of adverse effects of artesunate (prodrug for active metabolite, dihydroartemisinin). In the presence of efavirenz, mutations in CYP2B6 influenced the number of patients achieving day-7 lumefantrine concentrations above accepted therapeutic cut-offs. Lumefantrine concentrations were also influenced by ABCB1 variants in the presence of nevirapine. The most critical pharmacogenetic consideration identified was the association of glucose-6-phosphate dehydrogenase deficiency with development of hemolytic anemia and decreased hemoglobin levels in patients treated with primaquine or a combination of chlorproguanil-dapsone-artesunate. These findings demonstrate a need for close monitoring of patients originating from populations where genetic variation in metabolizing enzymes is prevalent, so as to ensure that optimal clinical outcomes are achieved. Future studies should determine which populations are at greatest risk of potential treatment failures and/or adverse effects, which drugs are most susceptible to genetic variation in metabolizing enzymes, and the impact of genetic influence on the efficacy and safety of first-line treatment regimens.
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Kumar Singh A, Rajendran V, Singh S, Kumar P, Kumar Y, Singh A, Miller W, Potemkin V, Poonam, Grishina M, Gupta N, Kempaiah P, Durvasula R, Singh BK, Dunn BM, Rathi B. Antiplasmodial activity of hydroxyethylamine analogs: Synthesis, biological activity and structure activity relationship of plasmepsin inhibitors. Bioorg Med Chem 2018; 26:3837-3844. [PMID: 29983285 DOI: 10.1016/j.bmc.2018.06.037] [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: 06/26/2018] [Accepted: 06/28/2018] [Indexed: 01/08/2023]
Abstract
Malaria, particularly in endemic countries remains a threat to the human health and is the leading the cause of mortality in the tropical and sub-tropical areas. Herein, we explored new C2 symmetric hydroxyethylamine analogs as the potential inhibitors of Plasmodium falciparum (P. falciparum; 3D7) in in-vitro cultures. All the listed compounds were also evaluated against crucial drug targets, plasmepsin II (Plm II) and IV (Plm IV), enzymes found in the digestive vacuole of the P. falciparum. Analog 10f showed inhibitory activities against both the enzymes Plm II and Plm IV (Ki, 1.93 ± 0.29 µM for Plm II; Ki, 1.99 ± 0.05 µM for Plm IV). Among all these analogs, compounds 10g selectively inhibited the activity of Plm IV (Ki, 0.84 ± 0.08 µM). In the in vitro screening assay, the growth inhibition of P. falciparum by both the analogs (IC50, 2.27 ± 0.95 µM for 10f; IC50, 3.11 ± 0.65 µM for 10g) displayed marked killing effect. A significant growth inhibition of the P. falciparum was displayed by analog 12c with IC50 value of 1.35 ± 0.85 µM, however, it did not show inhibitory activity against either Plms. The hemolytic assay suggested that the active compounds selectively inhibit the growth of the parasite. Further, potent analogs (10f and 12c) were evaluated for their cytotoxicity towards mammalian HepG2 and vero cells. The selectivity index (SI) values were noticed greater than 10 for both the analogs that suggested their poor toxicity. The present study indicates these analogs as putative lead structures and could serve as crucial for the development of new drug molecules.
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Affiliation(s)
- Amit Kumar Singh
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Vinoth Rajendran
- Department of Biochemistry, University of Delhi South Campus, New Delhi 110021, India
| | - Snigdha Singh
- Department of Chemistry, University of Delhi, Delhi 110007, India; Laboratory for Translational Chemistry and Drug Discovery, Department of Chemistry, Hansraj College, University of Delhi, Delhi 110007, India
| | - Prashant Kumar
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Yogesh Kumar
- Laboratory for Translational Chemistry and Drug Discovery, Department of Chemistry, Hansraj College, University of Delhi, Delhi 110007, India
| | - Archana Singh
- Department of Botany, Hansraj College University Enclave, University of Delhi, Delhi 110007, India
| | - Whelton Miller
- Department of Chemistry & Physics, Lincoln University, Lincoln University, PA 19352, USA; Department of Chemical & Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Vladimir Potemkin
- South Ural State University, Laboratory of Computational Modeling of Drugs, 454080, Russia
| | - Poonam
- South Ural State University, Laboratory of Computational Modeling of Drugs, 454080, Russia; Department of Chemistry, Miranda House University Enclave, University of Delhi, Delhi 110007 India
| | - Maria Grishina
- South Ural State University, Laboratory of Computational Modeling of Drugs, 454080, Russia
| | - Nikesh Gupta
- Special Centre for Nanosciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Prakasha Kempaiah
- Center for Global Health, Department of Internal Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA
| | - Ravi Durvasula
- Department of Medicine, Loyola University Stritch School of Medicine, Maywood, IL 60153, USA
| | | | - Ben M Dunn
- Department of Biochemistry & Molecular Biology, University of Florida College of Medicine, P.O. Box 100245, Gainesville, FL, USA
| | - Brijesh Rathi
- Laboratory for Translational Chemistry and Drug Discovery, Department of Chemistry, Hansraj College, University of Delhi, Delhi 110007, India; South Ural State University, Laboratory of Computational Modeling of Drugs, 454080, Russia.
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Lu HD, Ristroph KD, Dobrijevic ELK, Feng J, McManus SA, Zhang Y, Mulhearn WD, Ramachandruni H, Patel A, Prud’homme RK. Encapsulation of OZ439 into Nanoparticles for Supersaturated Drug Release in Oral Malaria Therapy. ACS Infect Dis 2018; 4:970-979. [PMID: 29575888 PMCID: PMC5996344 DOI: 10.1021/acsinfecdis.7b00278] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
![]()
Malaria
poses a major burden on human health and is becoming increasingly
difficult to treat due to the development of antimalarial drug resistance.
The resistance issue is further exacerbated by a lack of patient adherence
to multi-day dosing regimens. This situation motivates the development
of new antimalarial treatments that are less susceptible to the development
of resistance. We have applied Flash NanoPrecipitation (FNP), a polymer-directed
self-assembly process, to form stable, water-dispersible nanoparticles
(NPs) of 50–400 nm in size containing OZ439, a poorly orally
bioavailable but promising candidate for single-dose malaria treatment
developed by Medicines for Malaria Venture (MMV). During the FNP process,
a hydrophobic OZ439 oleate ion paired complex was formed and was encapsulated
into NPs. Lyophilization conditions for the NP suspension were optimized
to produce a dry powder. The in vitro release rates
of OZ439 encapsulated in this powder were determined in biorelevant
media and compared with the release rates of the unencapsulated drug.
The OZ439 NPs exhibit a sustained release profile and several-fold
higher release concentrations compared to that of the unencapsulated
drug. In addition, XRD suggests the drug was stabilized into an amorphous
form within the NPs, which may explain the improvement in dissolution
kinetics. Formulating OZ439 into NPs in this way may be an important
step toward developing a single-dose oral malaria therapeutic, and
offers the possibility of reducing the amount of drug required per
patient, lowering delivery costs, and improving dosing compliance.
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Affiliation(s)
- Hoang D. Lu
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Kurt D. Ristroph
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Ellen L. K. Dobrijevic
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Jie Feng
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Simon A. McManus
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Yingyue Zhang
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - William D. Mulhearn
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
| | - Hanu Ramachandruni
- Medicines for Malaria Venture, Route de Pré-Bois 20, 1215 Meyrin, Switzerland
| | - Anil Patel
- Medicines for Malaria Venture, Route de Pré-Bois 20, 1215 Meyrin, Switzerland
| | - Robert K. Prud’homme
- Department of Chemical and Biological Engineering, Princeton University, A301 Engineering Quadrangle, Olden Street, Princeton, New Jersey 08854, United States
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De Lucia S, Tsamesidis I, Pau MC, Kesely KR, Pantaleo A, Turrini F. Induction of high tolerance to artemisinin by sub-lethal administration: A new in vitro model of P. falciparum. PLoS One 2018; 13:e0191084. [PMID: 29342187 PMCID: PMC5771598 DOI: 10.1371/journal.pone.0191084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 12/18/2017] [Indexed: 12/13/2022] Open
Abstract
Artemisinin resistance is a major threat to malaria control efforts. Resistance is characterized by an increase in the Plasmodium falciparum parasite clearance half-life following treatment with artemisinin-based combination therapies (ACTs) and an increase in the percentage of surviving parasites. The remarkably short blood half-life of artemisinin derivatives may contribute to drug-resistance, possibly through factors including sub-lethal plasma concentrations and inadequate exposure. Here we selected for a new strain of artemisinin resistant parasites, termed the artemisinin resistant strain 1 (ARS1), by treating P. falciparum Palo Alto (PA) cultures with sub-lethal concentrations of dihydroartemisinin (DHA). The resistance phenotype was maintained for over 1 year through monthly maintenance treatments with low doses of 2.5 nM DHA. There was a moderate increase in the DHA IC50 in ARS1 when compared with parental strain PA after 72 h of drug exposure (from 0.68 nM to 2 nM DHA). In addition, ARS1 survived treatment physiologically relevant DHA concentrations (700 nM) observed in patients. Furthermore, we confirmed a lack of cross-resistance against a panel of antimalarials commonly used as partner drugs in ACTs. Finally, ARS1 did not contain Pfk13 propeller domain mutations associated with ART resistance in the Greater Mekong Region. With a stable growth rate, ARS1 represents a valuable tool for the development of new antimalarial compounds and studies to further elucidate the mechanisms of ART resistance.
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Affiliation(s)
- Serena De Lucia
- Department of Oncology, University of Turin, Turin, Italy
- * E-mail:
| | - Ioannis Tsamesidis
- Department of Medicine, Section of Internal Medicine, University of Verona, Verona, Italy
| | - Maria Carmina Pau
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - Kristina R. Kesely
- Department of Biochemistry, Purdue University, West Lafayette, United States of America
| | - Antonella Pantaleo
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
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Badshah SL, Ullah A, Ahmad N, Almarhoon ZM, Mabkhot Y. Increasing the Strength and Production of Artemisinin and Its Derivatives. Molecules 2018; 23:E100. [PMID: 29301383 PMCID: PMC6017432 DOI: 10.3390/molecules23010100] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 12/19/2017] [Accepted: 12/28/2017] [Indexed: 12/04/2022] Open
Abstract
Artemisinin is a natural sesquiterpene lactone obtained from the Artemisia annua herb. It is widely used for the treatment of malaria. In this article, we have reviewed the role of artemisinin in controlling malaria, spread of resistance to artemisinin and the different methods used for its large scale production. The highest amount of artemisinin gene expression in tobacco leaf chloroplast leads to the production of 0.8 mg/g of the dry weight of the plant. This will revolutionize the treatment and control of malaria in third world countries. Furthermore, the generations of novel derivatives of artemisinin- and trioxane ring structure-inspired compounds are important for the treatment of malaria caused by resistant plasmodial species. Synthetic endoperoxide-like artefenomel and its derivatives are crucial for the control of malaria and such synthetic compounds should be further explored.
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Affiliation(s)
- Syed Lal Badshah
- Department of Chemistry, Islamia College University Peshawar, Peshawar 25120, Pakistan.
| | - Asad Ullah
- Department of Chemistry, Islamia College University Peshawar, Peshawar 25120, Pakistan.
| | - Nasir Ahmad
- Department of Chemistry, Islamia College University Peshawar, Peshawar 25120, Pakistan.
| | - Zainab M Almarhoon
- Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Yahia Mabkhot
- Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
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Grech J, Robertson J, Thomas J, Cooper G, Naunton M, Kelly T. An empirical review of antimalarial quality field surveys: the importance of characterising outcomes. J Pharm Biomed Anal 2018; 147:612-623. [DOI: 10.1016/j.jpba.2017.04.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/19/2017] [Accepted: 04/23/2017] [Indexed: 10/19/2022]
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Canavati SE, Quintero CE, Haller B, Lek D, Yok S, Richards JS, Whittaker MA. Maximizing research study effectiveness in malaria elimination settings: a mixed methods study to capture the experiences of field-based staff. Malar J 2017; 16:362. [PMID: 28893264 PMCID: PMC5594431 DOI: 10.1186/s12936-017-2016-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 09/06/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND In a drug-resistant, malaria elimination setting like Western Cambodia, field research is essential for the development of novel anti-malarial regimens and the public health solutions necessary to monitor the spread of resistance and eliminate infection. Such field studies often face a variety of similar implementation challenges, but these are rarely captured in a systematic way or used to optimize future study designs that might overcome similar challenges. Field-based research staff often have extensive experience and can provide valuable insight regarding these issues, but their perspectives and experiences are rarely documented and seldom integrated into future research protocols. This mixed-methods analysis sought to gain an understanding of the daily challenges encountered by research field staff in the artemisinin-resistant, malaria elimination setting of Western Cambodia. In doing so, this study seeks to understand how the experiences and opinions of field staff can be captured, and used to inform future study designs. METHODS Twenty-two reports from six field-based malaria studies conducted in Western Cambodia were reviewed using content analysis to identify challenges to conducting the research. Informal Interviews, Focus Group Discussions and In-depth Interviews were also conducted among field research staff. Thematic analysis of the data was undertaken using Nvivo 9® software. Triangulation and critical case analysis was also used. RESULTS There was a lack of formalized avenues through which field workers could report challenges experienced when conducting the malaria studies. Field research staff faced significant logistical barriers to participant recruitment and data collection, including a lack of available transportation to cover long distances, and the fact that mobile and migrant populations (MMPs) are usually excluded from studies because of challenges in follow-up. Cultural barriers to communication also hindered participant recruitment and created unexpected delays. Field staff often paid a physical, emotional and financial cost, going beyond their duty in order to keep the study running. CONCLUSIONS Formal monthly reports filled out by field study staff could be a key tool for capturing field study staff experiences effectively, but require specific report fields to encourage staff to outline their challenges and to propose potential solutions. Forging strong bonds with communities and their leaders may improve communication, and decrease barriers to participant recruitment. Study designs that make it feasible for MMPs to participate should be pursued; in addition to increasing the potential participant pool, this will ensure that the most malaria-endemic demographic is taken into account in research studies. Overlaps between clinical care and research create ethical dilemmas for study staff, a fact that warrants careful consideration. Lessons learned from study field staff should be used to create a set of locally-relevant recommendations to inform future study designs.
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Affiliation(s)
- Sara E. Canavati
- Centre for Biomedical Research, Burnet Institute, Melbourne, Australia
- Vysnova Partners Inc., Washington, DC USA
| | - Cesia E. Quintero
- Centre for Biomedical Research, Burnet Institute, Melbourne, Australia
| | | | - Dysoley Lek
- The National Centre for Parasitology, Entomology and Malaria Control, Ministry of Health, Phnom Penh, Cambodia
| | - Sovann Yok
- Provincial Health Department, Pailin City, Pailin Province Cambodia
| | - Jack S. Richards
- Centre for Biomedical Research, Burnet Institute, Melbourne, Australia
- Department of Medicine, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
- Department of Infectious Diseases, Monash University, Melbourne, Australia
| | - Maxine Anne Whittaker
- College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, Australia
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Chotsiri P, Wattanakul T, Hoglund RM, Hanboonkunupakarn B, Pukrittayakamee S, Blessborn D, Jittamala P, White NJ, Day NPJ, Tarning J. Population pharmacokinetics and electrocardiographic effects of dihydroartemisinin-piperaquine in healthy volunteers. Br J Clin Pharmacol 2017; 83:2752-2766. [PMID: 28695570 PMCID: PMC5698590 DOI: 10.1111/bcp.13372] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 06/21/2017] [Accepted: 06/30/2017] [Indexed: 12/21/2022] Open
Abstract
Aims The aims of the present study were to evaluate the pharmacokinetic properties of dihydroartemisinin (DHA) and piperaquine, potential drug–drug interactions with concomitant primaquine treatment, and piperaquine effects on the electrocardiogram in healthy volunteers. Methods The population pharmacokinetic properties of DHA and piperaquine were assessed in 16 healthy Thai adults using an open‐label, randomized, crossover study. Drug concentration–time data and electrocardiographic measurements were evaluated with nonlinear mixed‐effects modelling. Results The developed models described DHA and piperaquine population pharmacokinetics accurately. Concomitant treatment with primaquine did not affect the pharmacokinetic properties of DHA or piperaquine. A linear pharmacokinetic–pharmacodynamic model described satisfactorily the relationship between the individually corrected QT intervals and piperaquine concentrations; the population mean QT interval increased by 4.17 ms per 100 ng ml–1 increase in piperaquine plasma concentration. Simulations from the final model showed that monthly and bimonthly mass drug administration in healthy subjects would result in median maximum QT interval prolongations of 18.9 ms and 16.8 ms, respectively, and would be very unlikely to result in prolongation of more than 50 ms. A single low dose of primaquine can be added safely to the existing DHA–piperaquine treatment in areas of multiresistant Plasmodium falciparum malaria. Conclusions Pharmacokinetic–pharmacodynamic modelling and simulation in healthy adult volunteers suggested that therapeutic doses of DHA–piperaquine in the prevention or treatment of P. falciparum malaria are unlikely to be associated with dangerous QT prolongation.
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Affiliation(s)
- Palang Chotsiri
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Thanaporn Wattanakul
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Richard M Hoglund
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | | | | | - Daniel Blessborn
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | | | - Nicholas J White
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Nicholas P J Day
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Joel Tarning
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
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Sweileh WM, Al-Jabi SW, Sawalha AF, AbuTaha AS, Zyoud SH. Bibliometric Analysis of Worldwide Publications on Antimalarial Drug Resistance (2006-2015). Malar Res Treat 2017; 2017:6429410. [PMID: 28856028 PMCID: PMC5569636 DOI: 10.1155/2017/6429410] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 04/28/2017] [Accepted: 07/10/2017] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND In response to international efforts to control and eradicate malaria, we designed this study to give a bibliometric overview of research productivity in antimalarial drug resistance (AMDR). METHODS Keywords related to AMDR were used to retrieve relevant literature using Scopus database. RESULTS A total of 976 publications with an h-index of 63 were retrieved. The number of publications showed a noticeable increase starting in the early 1990s. The USA was the most productive country with 337 publications equivalent to one-third of worldwide publications in this field. More than two-thirds of publications by the USA (236, 70.03%) were made by international collaboration. Of the top ten productive countries, two countries were from Mekong subregion, particularly Thailand and Cambodia. The Malaria Journal was the most productive journal (136, 13.93%) in this field. Mahidol University (80, 8.20%) in Thailand was the most productive institution. Seven articles in the top-ten list were about artemisinin resistance in Plasmodium falciparum, one was about chloroquine resistance, one was about sulfadoxine-pyrimethamine resistance, and the remaining one was about general multidrug resistance. CONCLUSION Eradication and control of AMDR require continuing research activity to help international health organizations identify spots that require an immediate action to implement appropriate measures.
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Affiliation(s)
- Waleed M. Sweileh
- Department of Physiology, Pharmacology and Toxicology, College of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Samah W. Al-Jabi
- Department of Clinical and Community Pharmacy, College of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Ansam F. Sawalha
- Department of Physiology, Pharmacology and Toxicology, College of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Adham S. AbuTaha
- Department of Physiology, Pharmacology and Toxicology, College of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
| | - Sa'ed H. Zyoud
- Department of Clinical and Community Pharmacy, College of Medicine and Health Sciences, An-Najah National University, Nablus, State of Palestine
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Aponte S, Guerra ÁP, Álvarez-Larrotta C, Bernal SD, Restrepo C, González C, Yasnot MF, Knudson-Ospina A. Baseline in vivo, ex vivo and molecular responses of Plasmodium falciparum to artemether and lumefantrine in three endemic zones for malaria in Colombia. Trans R Soc Trop Med Hyg 2017; 111:71-80. [DOI: 10.1093/trstmh/trx021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 04/13/2017] [Indexed: 01/28/2023] Open
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Abstract
Mangosteen (Garcinia mangostana Linn.) is a well-known tropical tree indigenous to Southeast Asia. Its fruit's pericarp abounds with a class of isoprenylated xanthones which are referred as mangostins. Numerous in vitro and in vivo studies have shown that mangostins and their derivatives possess diverse pharmacological activities, such as antibacterial, antifungal, antimalarial, anticarcinogenic, antiatherogenic activities as well as neuroprotective properties in Alzheimer's disease (AD). This review article provides a comprehensive review of the pharmacological activities of mangostins and their derivatives to reveal their promising utilities in the treatment of certain important diseases, mainly focusing on the discussions of the underlying molecular targets/pathways, modes of action, and relevant structure-activity relationships (SARs). Meanwhile, the pharmacokinetics (PK) profile and recent toxicological studies of mangostins are also described for further druggability exploration in the future.
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Alesaeidi S, Miraj S. A Systematic Review of Anti-malarial Properties, Immunosuppressive Properties, Anti-inflammatory Properties, and Anti-cancer Properties of Artemisia Annua. Electron Physician 2016; 8:3150-3155. [PMID: 27957318 PMCID: PMC5133043 DOI: 10.19082/3150] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Accepted: 08/14/2016] [Indexed: 12/14/2022] Open
Abstract
Artemisia annua belongs to the asteraceae family, indigenous to the mild climate of Asia. The aim of this study was to overview its anti-malarial properties, immunosuppressive properties, anti-inflammatory properties and anti-cancer properties. This systematic review was carried out by searching studies in PubMed, Medline, Web of Science, and IranMedex databases. The initial search strategy identified approximately ninety eight references. In this study, forty six studies were accepted for further screening and met all of our inclusion. The search terms were "Artemisia annua", "therapeutic properties", "and pharmacological effects". Artemisia annua is commonly used for its anti-malarial, immunosuppressive anti-inflammatory properties. Artemisia annua contributes to the treatment of various diseases such as diabetes, heart diseases, arthritis and eczema and possesses various effects such as antibacterial, antioxidant, anticoccidial, and antiviral effects. Furthermore, it was said to be good for cancer treatment. In this study, anti-malarial, immunosuppressive, anti-inflammatory properties of this plant are presented using published articles in scientific sites.
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Affiliation(s)
- Samira Alesaeidi
- M.D., Assistant Professor of Rheumatology and Internal Medicine, Department of Rheumatology, Internal Medicine, Amiralam Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Sepide Miraj
- M.D., Gynecologist, Fellowship of Infertility, Assistant Professor, Faculty of Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran
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Household perceptions and subjective valuations of indoor residual spraying programmes to control malaria in northern Uganda. Infect Dis Poverty 2016; 5:100. [PMID: 27716420 PMCID: PMC5053089 DOI: 10.1186/s40249-016-0190-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 08/29/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Insecticide-based tools remain critical for controlling vector-borne diseases in Uganda. Securing public support from targeted populations for such tools is an important component in sustaining their long-run effectiveness. Yet little quantitative evidence is available on the perceived benefits and costs of vector control programmes among targeted households. METHODS A survey was administered to a clustered random sample of 612 households in Gulu and Oyam districts of northern Uganda during a period of very high malaria transmission and following a pilot indoor residual spray (IRS) programme. A discrete choice experiment was conducted within the survey, in which respondents indicated their preferences for different IRS programmes relative to money compensation in a series of experimentally controlled, hypothetical choice sets. The data were analysed using conditional logit regression models to estimate respondents' willingness to accept (WTA) some amount of money compensation in lieu of foregone malaria risk reductions. Latent class models were used to analyse whether respondent characteristics predicted WTA. RESULTS Average WTA is estimated at $8.94 annually for a 10 % reduction in malaria risk, and additional co-benefits of IRS were estimated to be worth on average $54-$56 (depending on insecticide type) per round of IRS. Significant heterogeneity is observed: Four in five household heads in northern Uganda have high valuations for IRS programmes, while the remaining 20 % experience costly side effects of IRS (valued at between $2 and $3 per round). Statistically significant predictors of belonging to the high-value group include respondent gender, mean age of household members, participation in previous IRS, basic knowledge of mosquito reproduction, and the number of mosquito nets owned. Proxies for household income and wealth are not found to be statistically significant predictors of WTA. CONCLUSIONS This study suggests that the majority of people in areas of high malaria transmission like northern Uganda place a high value on vector control programmes using IRS. However, there is significant heterogeneity in terms of the perceived side effects (positive and negative). This has implications for sustaining public support for these programmes in the long-term.
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Single-Dose Primaquine in a Preclinical Model of Glucose-6-Phosphate Dehydrogenase Deficiency: Implications for Use in Malaria Transmission-Blocking Programs. Antimicrob Agents Chemother 2016; 60:5906-13. [PMID: 27458212 DOI: 10.1128/aac.00600-16] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 07/02/2016] [Indexed: 12/24/2022] Open
Abstract
Individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency (G6PDd) are at risk for developing hemolytic anemia when given the antimalarial drug primaquine (PQ). The WHO Evidence Review Group released a report suggesting that mass administration of a single dose of PQ at 0.25 mg of base/kg of body weight (mpk) (mouse equivalent of 3.125 mpk) could potentially reduce malaria transmission based on its gametocytocidal activity and could be safely administered to G6PD-deficient individuals, but there are limited safety data available confirming the optimum single dose of PQ. A single-dose administration of PQ was therefore assessed in our huRBC-SCID mouse model used to predict hemolytic toxicity with respect to G6PD deficiency. In this model, nonobese diabetic (NOD)/SCID mice are engrafted with human red blood cells (huRBC) from donors with the African or Mediterranean variant of G6PDd (A-G6PDd or Med-G6PDd, respectively) and demonstrate dose-dependent sensitivity to PQ. In mice engrafted with A-G6PD-deficient huRBC, single-dose PQ at 3.125, 6.25, or 12.5 mpk had no significant loss of huRBC compared to the vehicle control group. In contrast, in mice engrafted with Med-G6PDd huRBC, a single dose of PQ at 3.125, 6.25, or 12.5 mpk resulted in a significant, dose-dependent loss of huRBC compared to the value for the vehicle control group. Our data suggest that administration of a single low dose of 0.25 mpk of PQ could induce hemolytic anemia in Med-G6PDd individuals but that use of single-dose PQ at 0.25 mpk as a gametocytocidal drug to block transmission would be safe in areas where A-G6PDd predominates.
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Hastings IM, Hodel EM, Kay K. Quantifying the pharmacology of antimalarial drug combination therapy. Sci Rep 2016; 6:32762. [PMID: 27604175 PMCID: PMC5036534 DOI: 10.1038/srep32762] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/12/2016] [Indexed: 12/31/2022] Open
Abstract
Most current antimalarial drugs are combinations of an artemisinin plus a
‘partner’ drug from another class, and are known as
artemisinin-based combination therapies (ACTs). They are the frontline drugs in
treating human malaria infections. They also have a public-health role as an
essential component of recent, comprehensive scale-ups of malaria interventions and
containment efforts conceived as part of longer term malaria elimination efforts.
Recent reports that resistance has arisen to artemisinins has caused considerable
concern. We investigate the likely impact of artemisinin resistance by quantifying
the contribution artemisinins make to the overall therapeutic capacity of ACTs. We
achieve this using a simple, easily understood, algebraic approach and by more
sophisticated pharmacokinetic/pharmacodynamic analyses of drug action; the two
approaches gave consistent results. Surprisingly, the artemisinin component
typically makes a negligible contribution (≪0.0001%) to the therapeutic
capacity of the most widely used ACTs and only starts to make a significant
contribution to therapeutic outcome once resistance has started to evolve to the
partner drugs. The main threat to antimalarial drug effectiveness and control comes
from resistance evolving to the partner drugs. We therefore argue that public health
policies be re-focussed to maximise the likely long-term effectiveness of the
partner drugs.
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Affiliation(s)
- Ian M Hastings
- Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom
| | - Eva Maria Hodel
- Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom
| | - Katherine Kay
- Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom
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Woodrow CJ, White NJ. The clinical impact of artemisinin resistance in Southeast Asia and the potential for future spread. FEMS Microbiol Rev 2016; 41:34-48. [PMID: 27613271 PMCID: PMC5424521 DOI: 10.1093/femsre/fuw037] [Citation(s) in RCA: 151] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 04/11/2016] [Accepted: 07/31/2016] [Indexed: 11/25/2022] Open
Abstract
Artemisinins are the most rapidly acting of currently available antimalarial drugs. Artesunate has become the treatment of choice for severe malaria, and artemisinin-based combination therapies (ACTs) are the foundation of modern falciparum malaria treatment globally. Their safety and tolerability profile is excellent. Unfortunately, Plasmodium falciparum infections with mutations in the ‘K13’ gene, with reduced ring-stage susceptibility to artemisinins, and slow parasite clearance in patients treated with ACTs, are now widespread in Southeast Asia. We review clinical efficacy data from the region (2000–2015) that provides strong evidence that the loss of first-line ACTs in western Cambodia, first artesunate-mefloquine and then DHA-piperaquine, can be attributed primarily to K13 mutated parasites. The ring-stage activity of artemisinins is therefore critical for the sustained efficacy of ACTs; once it is lost, rapid selection of partner drug resistance and ACT failure are inevitable consequences. Consensus methods for monitoring artemisinin resistance are now available. Despite increased investment in regional control activities, ACTs are failing across an expanding area of the Greater Mekong subregion. Although multiple K13 mutations have arisen independently, successful multidrug-resistant parasite genotypes are taking over and threaten to spread to India and Africa. Stronger containment efforts and new approaches to sustaining long-term efficacy of antimalarial regimens are needed to prevent a global malaria emergency. Artemisinin resistance in Plasmodium falciparum malaria is causing failure of artemisinin-based combination therapies across an expanding area of Southeast Asia, undermining control and elimination efforts. The potential global consequences can only be avoided by new approaches that ensure sustained efficacy for antimalarial regimens in malaria affected populations.
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Affiliation(s)
- Charles J Woodrow
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6, Rajvithi Road, Bangkok 10400, Thailand
| | - Nicholas J White
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6, Rajvithi Road, Bangkok 10400, Thailand
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Luo Q, Wang Z, Chen H, Fang MH, Xie S, Qian X, Lin X. Identification of Anticancer Drug Candidate Targeting Nuclear Receptor Retinoid X receptor-α from Natural Products using Receptor-Ligand Recognition. ChemistrySelect 2016. [DOI: 10.1002/slct.201600907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Qiang Luo
- Animal Husbandry and Fisheries Research Center; Guangdong Haid Group Co., Ltd.; Guangzhou China
- Institute of Hydrobiology; Chinese Academy of Science; Wuhan China
| | - Zhaokai Wang
- Engineering Research Center of Marine Biological Resource Comprehensive Utilization, Third Institute of Oceanography; State Oceanic Administration; Xiamen China
| | - Huibin Chen
- Engineering Research Center of Marine Biological Resource Comprehensive Utilization, Third Institute of Oceanography; State Oceanic Administration; Xiamen China
| | - Ms. Hui Fang
- Engineering Research Center of Marine Biological Resource Comprehensive Utilization, Third Institute of Oceanography; State Oceanic Administration; Xiamen China
| | - Shouqi Xie
- Institute of Hydrobiology; Chinese Academy of Science; Wuhan China
| | - Xueqiao Qian
- Animal Husbandry and Fisheries Research Center; Guangdong Haid Group Co., Ltd.; Guangzhou China
| | - Xiangzhi Lin
- Engineering Research Center of Marine Biological Resource Comprehensive Utilization, Third Institute of Oceanography; State Oceanic Administration; Xiamen China
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