Other

Hopital Sainte-justine

Chaichem Pharmaceuticals International

Michel Potier

Krishna G Peri

Sylvain Chemtob

Trung Bui-Khac

Disclosed is a process for isolating and purifying paclitaxel from a natural resource of taxanes, comprising the steps of (a) washing a raw material comprising paclitaxel with water in order to remove soluble impurities from the raw material; (b) extracting with an organic solvent a wet raw material comprising paclitaxel; (c) contacting the wet raw material with a salt to obtain a biomass by precipitation, isolation, and drying; (d) removing resin and natural pigments from the dried biomass by dissolving the biomass in acetone or an acetone-hexane mixture, and adding at least one polar solvent until a paclitaxel-enriched oil phase is obtained; and (e) chromatography purifying the paclitaxel-enriched oil phase in a volatile solvent to obtain a purified solution, followed by crystallization.

Process for isolation and purification of paclitaxel from natural sources

The present invention relates to a new class of G-protein-coupled receptor antagonists which bind to the intracellular molecular interface between the receptor and the G-protein, thus hampering signal transduction. The present invention describes peptide sequences derived from the prostaglandin receptor F,and the G-protein, G,protein. produced by molecular biology techniques or chemical synthesis, as selective inhibitors of signal transduction involved in the stimulation of this receptor. Such peptides or molecules derived from their primary, secondary and tertiary structures may be used as effective tocolytics for the prevention of premature labor or be utilized for the treatment of dysmenorrhea.

Antagonists of G-protein-coupled receptor

The present invention relates to a new class of G-protein-coupled receptor antagonists which bind to the intracellular molecular interface between the receptor and the G-protein, thus hampering signal transduction. The present invention describes peptide sequences derived from the prostaglandin receptor F.sub.2.alpha. and the G-protein, G.alpha.q protein, produced by molecular biology techniques or chemical synthesis, as selective inhibitors of signal transduction involved in the stimulation of this receptor. Such peptides or molecules derived from their primary, secondary and tertiary structures may be used as effective tocolytics for the prevention of premature labor or be utilized for the treatment of dysmenorrhea.

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Montreal, Canada

Michel Potier