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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Marie-Pierre Maether; Corinne Payrastre; Alexis Valentin; Université Toulouse 3 Paul Sabatier (1969-....). |
OCLC Number: | 800565447 |
Description: | 1 vol. (255 p.) : ill. ; 30 cm. |
Responsibility: | Marie-Pierre Maether ; directeur de thèse, Corinne Payrastre et Alexis Valentin. |
Abstract:
Malaria kills about 1 million people per year and parasites develop resistance to clinically used chemotherapeutic agents and prophylactic drugs. Therefore, an urgent need exists to develop new classes of antimalarial drugs. With this aim, streptocyanines, polymethine delocalized lipophilic cationic dyes, were synthesised by reaction of various nitrogen nucleophiles on carboxonium salts with variable length of the polymethine chain (5C, 7C, 9C). Hybrid molecules, streptocyanine/4-aminoquinoline and streptocyanine/peroxide, were also obtained. The most active compounds displayed sub-micromolar in vitro antiplasmodial activities and the best selectivity was obtained for 5C-streptocyanines. SAR studies have shown the influence of polymethine chain length and also the great importance of the structural modifications at nitrogen end groups. There was a moderate effect of para aromatic substitution, except for molecules with 4-fluoro phenyl groups associated with morpholino end-groups. The studies carried out for evaluate the mechanism of action show that the three studied streptocyanines don't form complex with heme, and that the molecules 5C and 7C in opposition with 9C, could not have an effect on DNA replication and RNA transcription, but rather on proteins synthesised in the first part of erythrocyte cycle. Moreover, fluorescence microscopy observations show that only 9C could concentrate in nuclear parasite compartment. Only 9C as well, seem to interact with different single or double strand ODNs. In vitro gametocytocide activity was observed for the studied streptocyanines. The redox properties of some streptocyanines are also reported.
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