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plasmodium berghei

Diatretol, an α, α'-dioxo-diketopiperazine, is a potent in vitro and in vivo antimalarial

January 19, 2021 - 16:04 -- Open Access
Author(s): 
Ishiyama A, Hokari R, Nonaka K, Chiba T, Miura H, Otoguro K, Iwatsuki M
Reference: 
J Antibiot (Tokyo). 2021 Jan 14:1-3

A fungal metabolite, diatretol, has shown to be a promising antimalarial agent.

Anti-Oxidant Potential and Antimalarial Effects of Acanthus polystachyus Delile (Acanthaceae) Against Plasmodium berghei: Evidence for in vivo Antimalarial Activity

December 23, 2020 - 10:32 -- Open Access
Author(s): 
Kifle ZD, Atnafie SA
Reference: 
J Exp Pharmacol. 2020 Dec 11;12:575-587

Malaria is among the most devastating and widespread tropical parasitic diseases which is more prevalent in developing countries. Acanthus polystachyus (Acanthaceae) leaves are traditionally used for the treatment of malaria in Ethiopia. This study aimed to investigate the in vivo antimalarial and in vitro antioxidant activity of the leaves extract of Acanthus polystachyus.

MRE11 Is Crucial for Malaria Parasite Transmission and Its Absence Affects Expression of Interconnected Networks of Key Genes Essential for Life

December 9, 2020 - 07:27 -- Open Access
Author(s): 
Guttery DS, Ramaprasad A, Ferguson DJP, Zeeshan M, Pandey R, Brady D, Holder AA, Pain A, Tewari R
Reference: 
Cells. 2020 Dec 3;9(12):E2590

The meiotic recombination 11 protein (MRE11) plays a key role in DNA damage response and maintenance of genome stability. However, little is known about its function during development of the malaria parasite Plasmodium.

Structural ordering of the Plasmodium berghei circumsporozoite protein repeats by inhibitory antibody 3D11

December 3, 2020 - 12:17 -- Open Access
Author(s): 
Kucharska I, Thai E, Srivastava A, Rubinstein JL, Pomès R, Julien JP
Reference: 
Elife. 2020 Nov 30;9:e59018

Plasmodium sporozoites express circumsporozoite protein (CSP) on their surface, an essential protein that contains central repeating motifs. Antibodies targeting this region can neutralize infection, and the partial efficacy of RTS,S/AS01 - the leading malaria vaccine against P. falciparum (Pf) - has been associated with the humoral response against the repeats.

Not Open Access | Comparative antimalarial, toxicity and mito-protective effects of Diospyros mespiliformis Hochst. ex A. DC. and Mondia whitei (Hook.f.) Skeels on Plasmodium berghei infection in mice

November 18, 2020 - 11:41 -- NOT Open Access
Author(s): 
Olanlokun JO, Bodede O, Prinsloo G, Olorunsogo OO
Reference: 
J Ethnopharmacol. 2020 Nov 12:113585

Diospyros mespiliformis Hochst. ex A. DC. and Mondia whitei (Hook.f.) Skeels are traditionally used in Africa for the treatment of malaria. However, scientific evidence to substantiate this folkloric claim and their effects on liver mitochondria during malaria treatment have not been reported.

Aim of the study

This study investigated the efficacy of D. mespiliformis and M. whitei against chloroquine-sensitive and resistant strains of malarial parasites in mice. It also investigated the toxicity and protection against cellular organelles like mitochondria.

Plasmodium berghei K13 Mutations Mediate In Vivo Artemisinin Resistance That Is Reversed by Proteasome Inhibition

November 11, 2020 - 14:33 -- Open Access
Author(s): 
Simwela NV, Stokes BH, Aghabi D, Bogyo M, Fidock DA, Waters AP
Reference: 
mBio. 2020 Nov 10;11(6):e02312-20

The recent emergence of Plasmodium falciparum parasite resistance to the first line antimalarial drug artemisinin is of particular concern. Artemisinin resistance is primarily driven by mutations in the P. falciparum K13 protein, which enhance survival of early ring-stage parasites treated with the artemisinin active metabolite dihydroartemisinin in vitro and associate with delayed parasite clearance in vivo However, association of K13 mutations with in vivo artemisinin resistance has been problematic due to the absence of a tractable model.

NOT Open Access | Antimalarial properties and preventive effects on mitochondrial dysfunction by extract and fractions of Phyllanthus amarus (Schum. and Thonn) in Plasmodium berghei-infected mice

November 10, 2020 - 14:30 -- NOT Open Access
Author(s): 
Olanlokun JO, Babarinde CO, Olorunsogo OO
Reference: 
J Basic Clin Physiol Pharmacol. 2020 Nov 6, 20200046, eISSN 2191-0286, ISSN 0792-6855

Broad spectrum antimalarial drugs without deleterious effects on mitochondria are scarce. It is in this regard that we investigated the potency of methanol extract and solvent fractions of Phyllanthus amarus on chloroquine-susceptible and resistant strains of Plasmodium berghei, toxicity and its consequential effects on mitochondrial permeability transition (mPT) pore opening.

NOT Open Access | Expression of Heat shock protein 70 (Hsp70-1) in Plasmodium berghei ookinetes and its participation in midgut mosquito infection

November 7, 2020 - 12:32 -- NOT Open Access
Author(s): 
Rodriguez MC, Martínez-Barnetche J, Lecona-Valera AN, Téllez-Sosa J, Argotte-Ramos RS, Alvarado-Delgado A, Ovilla MT, Saldaña-Navor V, Rodriguez MH
Reference: 
Mol Biochem Parasitol. 2020 Nov 1:111337

The heat shock protein family 70 (Hsp70) comprises chaperone proteins that play major multiple roles in Plasmodium asexual and sexual development. In this study, we analyzed the expression of Hsp70-1 in gametocytes, gametes, zygotes, and its participation in ookinete formation and their transition into oocysts. A monoclonal antibody against recombinant Hsp70-1 revealed its presence in zygotes and micronemes of ookinetes.

Plasmodium DEH is ER-localized and crucial for oocyst mitotic division during malaria transmission

October 28, 2020 - 09:57 -- Open Access
Author(s): 
Guttery DS, Pandey R, Ferguson DJ, Wall RJ, Brady D, Gupta D, Holder AA, Tewari R
Reference: 
Life Sci Alliance. 2020 Oct 26;3(12):e202000879

Cells use fatty acids (FAs) for membrane biosynthesis, energy storage, and the generation of signaling molecules. 3-hydroxyacyl-CoA dehydratase-DEH-is a key component of very long chain fatty acid synthesis. Here, we further characterized in-depth the location and function of DEH, applying in silico analysis, live cell imaging, reverse genetics, and ultrastructure analysis using the mouse malaria model Plasmodium berghei DEH is evolutionarily conserved across eukaryotes, with a single DEH in Plasmodium spp. and up to three orthologs in the other eukaryotes studied.

The CLIP-domain serine protease CLIPC9 regulates melanization downstream of SPCLIP1, CLIPA8, and CLIPA28 in the malaria vector Anopheles gambiae

October 13, 2020 - 13:03 -- Open Access
Author(s): 
Sousa GL, Bishnoi R, Baxter RHG, Povelones M
Reference: 
PLoS Pathog. 2020 Oct 12;16(10):e1008985

The arthropod melanization immune response is activated by extracellular protease cascades predominantly comprised of CLIP-domain serine proteases (CLIP-SPs) and serine protease homologs (CLIP-SPHs). In the malaria vector, Anopheles gambiae, the CLIP-SPHs SPCLIP1, CLIPA8, and CLIPA28 form the core of a hierarchical cascade downstream of mosquito complement that is required for microbial melanization. However, our understanding of the regulatory relationship of the CLIP-SPH cascade with the catalytic CLIP-SPs driving melanization is incomplete.

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