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Teklemichael AA, Teshima A, Hirata A, Akimoto M, Taniguchi M, Khodakaramian G, Fujimura T, Tokumasu F, Arakawa K, Mizukami S. Discovery of antimalarial drugs from secondary metabolites in actinomycetes culture library. Trop Med Health 2024; 52:47. [PMID: 38982547 PMCID: PMC11232162 DOI: 10.1186/s41182-024-00608-1] [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: 02/05/2024] [Accepted: 05/29/2024] [Indexed: 07/11/2024] Open
Abstract
BACKGROUND Natural products play a key role as potential sources of biologically active substances for the discovery of new drugs. This study aimed to identify secondary metabolites from actinomycete library extracts that are potent against the asexual stages of Plasmodium falciparum (P. falciparum). METHODS Secondary metabolites from actinomycete library extracts were isolated from culture supernatants by ethyl acetate extraction. Comprehensive screening was performed to identify novel antimalarial compounds from the actinomycete library extracts (n = 28). The antimalarial activity was initially evaluated in vitro against chloroquine/mefloquine-sensitive (3D7) and-resistant (Dd2) lines of P. falciparum. The cytotoxicity was then evaluated in primary adult mouse brain (AMB) cells. RESULTS Out of the 28 actinomycete extracts, 17 showed parasite growth inhibition > 50% at a concentration of 50 µg/mL, nine were identified with an IC50 value < 10 µg/mL, and seven suppressed the parasite significantly with an IC50 value < 5 µg/mL. The extracts from Streptomyces aureus strains HUT6003 (Extract ID number: 2), S. antibioticus HUT6035 (8), and Streptomyces sp. strains GK3 (26) and GK7 (27), were found to have the most potent antimalarial activity with IC50 values of 0.39, 0.09, 0.97, and 0.36 µg/mL (against 3D7), and 0.26, 0.22, 0.72, and 0.21 µg/mL (against Dd2), respectively. Among them, Streptomyces antibioticus strain HUT6035 (8) showed the highest antimalarial activity with an IC50 value of 0.09 µg/mL against 3D7 and 0.22 µg/mL against Dd2, and a selective index (SI) of 188 and 73.7, respectively. CONCLUSION Secondary metabolites obtained from the actinomycete extracts showed promising antimalarial activity in vitro against 3D7 and Dd2 cell lines of P. falciparum with minimal toxicity. Therefore, secondary metabolites obtained from actinomycete extracts represent an excellent starting point for the development of antimalarial drug leads.
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Affiliation(s)
- Awet Alem Teklemichael
- Department of Immune Regulation, SHIONOGI Global Infectious Diseases Division, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Nagasaki, Japan
| | - Aiko Teshima
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Hiroshima Research Center for Healthy Aging (HiHA), Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Asahi Hirata
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Hiroshima Research Center for Healthy Aging (HiHA), Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Momoko Akimoto
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Hiroshima Research Center for Healthy Aging (HiHA), Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Mayumi Taniguchi
- Department of Immune Regulation, SHIONOGI Global Infectious Diseases Division, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Nagasaki, Japan
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Nagasaki, Japan
| | - Gholam Khodakaramian
- Department of Plant Protection, College of Agriculture, Bu-Ali Sina University, Hamedan, Iran
| | - Takashi Fujimura
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Hiroshima Research Center for Healthy Aging (HiHA), Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Fuyuki Tokumasu
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Nagasaki, Japan
- Department of Cellular Architecture Studies, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Nagasaki, Japan
- Department of Laboratory Sciences, Graduate School of Health Sciences, Gunma University, Maebashi, Gunma, Japan
| | - Kenji Arakawa
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
- Hiroshima Research Center for Healthy Aging (HiHA), Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
| | - Shusaku Mizukami
- Department of Immune Regulation, SHIONOGI Global Infectious Diseases Division, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Nagasaki, Japan.
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Nagasaki, Japan.
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de Carvalho LP, Niepoth E, Mavraj-Husejni A, Kreidenweiss A, Herrmann J, Müller R, Knaab T, Burckhardt BB, Kurz T, Held J. Quantification of Plasmodium falciparum HRP-2 as an alternative method to [ 3H]hypoxanthine incorporation to measure the parasite reduction ratio in vitro. Int J Antimicrob Agents 2023; 62:106894. [PMID: 37348620 DOI: 10.1016/j.ijantimicag.2023.106894] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/06/2023] [Accepted: 06/10/2023] [Indexed: 06/24/2023]
Abstract
In the absence of a highly efficacious vaccine, chemotherapy remains the cornerstone to control malaria morbidity and mortality. The threat of the emergence of parasites resistant to artemisinin-based combination therapies highlights the need for new antimalarial drugs ideally with superior properties. The killing rate reflects the speed of action of antimalarial drugs, which can be measured in vitro through the parasite reduction ratio (PRR) assay to shortlist interesting candidates. As a standard, the in vitro PRR assay is performed by measuring [3H]hypoxanthine incorporation of Plasmodium falciparum. This methodology is restricted to specialised laboratories owing to the handling of radioactive material. In this work, we describe a sandwich enzyme-linked immunosorbent assay to detect P. falciparum histidine-rich protein 2 (HRP-2) as an alternative methodology to assess the PRR. We first validated the methodology with established antimalarial drugs (artesunate, chloroquine, pyrimethamine and atovaquone) by comparing our results with previous results of the [3H]hypoxanthine incorporation readout provided by an expert laboratory, and subsequently assessed the speed of action of four new antimalarial candidates (compound 22, chlorotonil A, boromycin and ivermectin). The HRP-2 PRR assay achieved comparable results to the [3H]hypoxanthine incorporation readout in terms of parasite growth rate over time, lag phase and parasite clearance time. In addition, parasite growth following drug exposure was quantified after 7, 14, 21 and 28 days of recovery time. In conclusion, the PRR assay based on HRP-2 is similar to [3H]hypoxanthine in determining a drug's parasite killing rate and can be widely used in all research laboratories.
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Affiliation(s)
| | - Elena Niepoth
- Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany
| | | | - Andrea Kreidenweiss
- Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany; Centre de Recherches Médicales de Lambaréné, Lambaréné, Gabon; German Center for Infection Research (DZIF), Braunschweig, Germany
| | - Jennifer Herrmann
- German Center for Infection Research (DZIF), Braunschweig, Germany; Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken, Germany
| | - Rolf Müller
- German Center for Infection Research (DZIF), Braunschweig, Germany; Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken, Germany
| | - Tanja Knaab
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Bjoern B Burckhardt
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Münster, Germany
| | - Thomas Kurz
- Institute of Pharmaceutical and Medicinal Chemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Jana Held
- Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany; Centre de Recherches Médicales de Lambaréné, Lambaréné, Gabon; German Center for Infection Research (DZIF), Braunschweig, Germany.
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Bernard MM, Mohanty A, Rajendran V. Title: A Comprehensive Review on Classifying Fast-acting and Slow-acting Antimalarial Agents Based on Time of Action and Target Organelle of Plasmodium sp. Pathog Dis 2022; 80:6589403. [PMID: 35588061 DOI: 10.1093/femspd/ftac015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 03/20/2022] [Accepted: 05/17/2022] [Indexed: 11/13/2022] Open
Abstract
The clinical resistance towards malarial parasites has rendered many antimalarials ineffective, likely due to a lack of understanding of time of action and stage specificity of all life stages. Therefore, to tackle this problem a more incisive comprehensive analysis of the fast and slow-acting profile of antimalarial agents relating to parasite time-kill kinetics and the target organelle on the progression of blood-stage parasites was carried out. It is evident from numerous findings that drugs targeting food vacuole, nuclear components, and endoplasmic reticulum mainly exhibit a fast-killing phenotype within 24h affecting first-cycle activity. Whereas drugs targeting mitochondria, apicoplast, microtubules, parasite invasion and egress exhibit a largely slow-killing phenotype within 96-120h, affecting second-cycle activity with few exemptions as moderately fast-killing. It is essential to understand the susceptibility of drugs on rings, trophozoites, schizonts, merozoites, and the appearance of organelle at each stage of 48h intraerythrocytic parasite cycle. Therefore, these parameters may facilitate the paradigm for understanding the timing of antimalarials action in deciphering its precise mechanism linked with time. Thus, classifying drugs based on the time of killing may promote designing new combination regimens against varied strains of P. falciparum and evaluating potential clinical resistance.
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Affiliation(s)
- Monika Marie Bernard
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605014, India
| | - Abhinab Mohanty
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605014, India
| | - Vinoth Rajendran
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605014, India
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Poje G, Pessanha de Carvalho L, Held J, Moita D, Prudêncio M, Perković I, Tandarić T, Vianello R, Rajić Z. Design and synthesis of harmiquins, harmine and chloroquine hybrids as potent antiplasmodial agents. Eur J Med Chem 2022; 238:114408. [DOI: 10.1016/j.ejmech.2022.114408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 04/07/2022] [Accepted: 04/20/2022] [Indexed: 01/12/2023]
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