Formulation of multivalent antibody constructs and use of...

A - Human Necessities – 61 – K

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A61K 39/395 (2006.01) A61K 9/127 (2006.01) A61K 47/48 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2582937

The invention relates to the formation of multivalent antibody constructs for testing and therapeutic purposes. In one embodiment the constructs consist of antibodies or antibody fragments conjugated to liposomes. The constructs are employed in a cell-based in vitro assay for comparing the therapeutic activity of antibodies or antibody fragments in multivalent form to the same antibodies or fragments in bivalent, free form. The assay is useful for identifying antibodies having potential in vivo activity. Selected antibodies may then be tested in an animal model of a disease state, such as cancer or an autoimmune disorder. Co-delivery of antibodies and chemotherapeutics may also be investigated. In accordance with the invention, a significant enhancement in the activity of antibodies such as trastuzumab and rituximab was observed when these antibodies were presented in the multivalent liposomal form. Key cell survival signaling molecules were down-regulated upon treatment with the multivalent liposomal antibody construct. The invention demonstrates the potential of liposome technology to enhance the therapeutic effect of antibodies via a mechanism that modulates cell survival, likely through clustering of target/antibody complex.

L'invention concerne la formation de constructions d'anticorps multivalentes utilisées pour réaliser des essais ou à des fins thérapeutiques. Dans un mode de réalisation, les constructions sont constituées d'anticorps ou de fragments d'anticorps conjugués à des liposomes. Les constructions de l'invention sont employées dans un dosage cellulaire in vitro destiné à comparer l'activité thérapeutique d'anticorps ou de fragments d'anticorps de fome multivalente à celle d'anticorps ou de fragments d'anticorps de fome libre divalente. Le dosage est utilisé pour identifier des anticorps présentant une activité in vivo potentielle. Des anticorps choisis peuvent ensuite être testés chez un modèle animal d'un état de maladie, tel que le cancer ou un trouble auto-immune. L'administration combinée d'anticorps et de substances chimiothérapeutiques peut également être étudiée. Selon l'invention, un regain sensible de l'activité d'anticorps, tels que trastuzumab et rituximab, a été observé lorsque ces anticorps ont été présentés dans leur forme liposomale multivalente. Des molécules d'indication de survie de cellules vitales ont été régulées négativement après traitement avec la construction liposomale multivalente. L'invention démontre l'aptitude de la technique liposomale à améliorer l'effet thérapeutique d'anticorps par l'intermédiaire d'un mécanisme modulant la survie des cellules, vraisemblablement par agrégation d'un complexe cible/anticorps.

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