Cytotoxic peptides and peptidomimetics based thereon, and...

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/705 (2006.01) A61K 31/7088 (2006.01) A61K 38/00 (2006.01) A61K 38/04 (2006.01) A61K 38/17 (2006.01) A61K 39/395 (2006.01) A61K 45/00 (2006.01) A61K 48/00 (2006.01) A61P 25/28 (2006.01) C07K 14/00 (2006.01) C07K 16/00 (2006.01) C07K 17/00 (2006.01) C12Q 1/02 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2443160

In accordance with the present invention, it has been discovered that the .beta.-amyloid precursor protein (APP), and two APP-like proteins (APLP1 and APLP2) are proteolytically cleaved by caspases in the C terminus to generate an approximately 31 amino acid peptide. It has been further discovered that the resultant C-terminal peptide is a potent inducer of apoptosis. Both caspase-cleaved APP and activated caspase-9 is present in brains of Alzheimer's disease patients but not in control brains. These findings indicate that caspase cleavage of APP and APP-like proteins leads to the generation of apoptotic peptides, which may contribute to the neuronal death associated with Alzheimer's disease. Accordingly, there are provided compositions and methods for modulating apoptosis.

L'invention est fondée sur la découverte selon laquelle le précurseur de la protéine bêta-amyloïde (APP), et deux protéines apparentées à APP (APLP1 et APLP2) sont clivées protéolytiquement par des caspases en position terminale C afin de générer un peptide d'environ 31 acides aminés. L'on a découvert en outre que le peptide en position terminale C obtenu est un puissant inducteur de l'apoptose. Tant l'APP clivée par la caspase que la caspase-9 activée sont présentes dans le cerveau de patients atteints de la maladie d'Alzheimer, mais pas dans un cerveau de contrôle. Ces découvertes indiquent que le clivage par la caspase de la protéine APP ou apparentée à APP donne lieu à la production de peptides apoptotiques, lesquels peuvent contribuer à la mort neuronale associée à la maladie d'Alzheimer. L'invention concerne en outre des compositions et des méthodes de modulation de l'apoptose.

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