Clotrimazole scaffold as an innovative pharmacophore towards potent antimalarial agents: design, synthesis, and biological and structure-activity relationship studies. 2008

Sandra Gemma, and Giuseppe Campiani, and Stefania Butini, and Gagan Kukreja, and Salvatore Sanna Coccone, and Bhupendra P Joshi, and Marco Persico, and Vito Nacci, and Isabella Fiorini, and Ettore Novellino, and Ernesto Fattorusso, and Orazio Taglialatela-Scafati, and Luisa Savini, and Donatella Taramelli, and Nicoletta Basilico, and Silvia Parapini, and Giulia Morace, and Vanessa Yardley, and Simon Croft, and Massimiliano Coletta, and Stefano Marini, and Caterina Fattorusso
Universita di Siena, Sienna, Italy.

We describe herein the design, synthesis, biological evaluation, and structure-activity relationship (SAR) studies of an innovative class of antimalarial agents based on a polyaromatic pharmacophore structurally related to clotrimazole and easy to synthesize by low-cost synthetic procedures. SAR studies delineated a number of structural features able to modulate the in vitro and in vivo antimalarial activity. A selected set of antimalarials was further biologically investigated and displayed low in vitro toxicity on a panel of human and murine cell lines. In vitro, the novel compounds proved to be selective for free heme, as demonstrated in the beta-hematin inhibitory activity assay, and did not show inhibitory activity against 14-alpha-lanosterol demethylase (a fungal P450 cytochrome). Compounds 2, 4e, and 4n exhibited in vivo activity against P. chabaudi after oral administration and thus represent promising antimalarial agents for further preclinical development.

UI MeSH Term Description Entries
D008958 Models, Molecular Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures. Molecular Models,Model, Molecular,Molecular Model
D010088 Oxidoreductases The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9) Dehydrogenases,Oxidases,Oxidoreductase,Reductases,Dehydrogenase,Oxidase,Reductase
D010962 Plasmodium berghei A protozoan parasite of rodents transmitted by the mosquito Anopheles dureni. Plasmodium bergheus,berghei, Plasmodium
D010963 Plasmodium falciparum A species of protozoa that is the causal agent of falciparum malaria (MALARIA, FALCIPARUM). It is most prevalent in the tropics and subtropics. Plasmodium falciparums,falciparums, Plasmodium
D011524 Protoporphyrins Porphyrins with four methyl, two vinyl, and two propionic acid side chains attached to the pyrrole rings. Protoporphyrin IX occurs in hemoglobin, myoglobin, and most of the cytochromes.
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D003022 Clotrimazole An imidazole derivative with a broad spectrum of antimycotic activity. It inhibits biosynthesis of the sterol ergostol, an important component of fungal CELL MEMBRANES. Its action leads to increased membrane permeability and apparent disruption of enzyme systems bound to the membrane. Bay b 5097,Canesten,FB b 5097,Kanesten,Klotrimazole,Lotrimin,Mycelex
D005260 Female Females
D005290 Ferric Compounds Inorganic or organic compounds containing trivalent iron. Compounds, Ferric
D006418 Heme The color-furnishing portion of hemoglobin. It is found free in tissues and as the prosthetic group in many hemeproteins. Ferroprotoporphyrin,Protoheme,Haem,Heme b,Protoheme IX

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