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Role of apoptosis in the transmission of Plasmodium falciaprum

Thesis

French

ID: <10670/1.0lhl09>

Abstract

Plasmodium species use programmed cell death for the survival of their offspring as some prokaryotic parasites. This study was designed to - assess the gametocytes carrier and their genotypes before/ after treatment and studying their infectivity; - express the catalytic domain (PfMCA1-cd-Sc) of Plasmodium falciparum metacaspase (PfMCA1) in yeast; - Test the “in vitro” anti-plasmodial activity of pyrano and ferro- quinolines derived new synthetic molecules on 3D7 and Dd2 Chloroquine laboratory clones. The 28-day “in vivo” WHO test, molecular markers of resistance and direct feeding; yeast culture, protein expression of P. falciparum metacaspase 1, Western blot, proliferation and survival test, and cell death markers were used to achieve the first two objectives while parasite culture and in vitro tests by the method of fluorimetry in SYBR Green I was used to evaluate the anti-plasmodial activity of new molecules. Results show that post-treatment gametocytes were carriers of point mutations and the most infective in the Chloroquine group. The heterologous expression of PfMCA1 catalytic domain in Saccharomyces cerevisiae resulted in apoptotic clonal death and growth retardation activity-dependent Protease-VAD, showing the involvement of PfMCA1 in the process of cell death. The aromatic substitutes with pyrimidine or benzyldimethylamine ferrocene residues showed satisfactory activity against the methoxyethylidene on 3D7 and Dd2. The data suggest that the structural optimization of these compounds based on pyrimidine and ferrocene is more interesting from the standpoint anti-plasmodial activity for candidate molecules in the near future.

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