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Synthèse et évaluation pharmacologique de nouveaux peptides biomimétiques et de benzothiadiazines

Abstract : ATP-sensitive potassium channels (KATP) play an important role in many cellular processes. The modulation of these channels by activating molecules may constitute very interesting pharmacological and medicinal applications. For this purpose, we have designed and synthesized new hybrid molecules cromakalim-diazoxide and diazoxide-amine/aminoacid. We also evaluated the relaxant activity of these compounds on aorta of rats. The obtained results do not show a significant relaxant effect. Studies on other tissues, including pancreatic  cells and uterine muscle, are envisaged to explore the potency of these compounds and their possible tissue selectivity.Otherwise, Protein-protein interactions play a fundamental role in almost all cellular processes. They are strongly involved in the formation of the dimeric structure of HIV-1 protease and β amyloid peptide aggregation involved in Alzheimer's disease. Inhibition of these interactions would be a therapeutic advantage for the treatment of AIDS and Alzheimer's disease. We designed and synthesized on one hand, molecular tongs based on carbonylhydrazide oligohydrazid (Azatide) fragments and in the other hand, pentapeptide molecules with a central fluorinated and hydroxylated aminoacid. Finally, we tested the ability of molecular tongs to disrupt the terminal β sheet of the HIV-1 PR to inhibit its dimerization and thus its activity. We have also conducted a structure-activity relationship study and According to the results it seems that flexibility is detrimental to the inhibitory activity. We evaluated as well the ability of new fluorinated and hydroxylated peptidomimetics to accelerate or inhibit the aggregation of Aβ1-42 peptide in order to reduce the presence of small toxic oligomers. The results are very promising that we succeeded in developing a pentapeptide able to completely inhibit the aggregation of Aβ1-42, and in the other hand pseudopentapeptides able to accelerate its aggregation. We also demonstrated the influence of fluorine on the structure of a pentapeptides. Studies by NMR and DC are in progress.
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Nadjib Kihal. Synthèse et évaluation pharmacologique de nouveaux peptides biomimétiques et de benzothiadiazines. Autre. Université Paris Sud - Paris XI; Université de Jijel, 2013. Français. ⟨NNT : 2013PA114804⟩. ⟨tel-00940587⟩

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