Site specific binding system, imaging compositions and methods

A - Human Necessities – 61 – K

Patent

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Details

A61K 49/00 (2006.01) A61K 9/107 (2006.01) A61K 9/127 (2006.01) A61K 31/70 (2006.01) A61K 39/395 (2006.01) A61K 47/48 (2006.01) A61K 48/00 (2006.01) A61K 49/18 (2006.01) A61K 51/04 (2006.01) A61K 51/12 (2006.01) C12Q 1/68 (2006.01) G01N 33/543 (2006.01) G01N 33/58 (2006.01)

Patent

CA 2222544

A method for ligand-based binding of lipid encapsulated particles to molecular epitopes on a surface in vivo or in vitro comprises sequentially administering (a) a site-specific ligand activated with a biotin activating agent; (b) an avidin activating agent; and (c) lipid encapsulated particles activated with a biotin activating agent, whereby the ligand is conjugated to the particles through an avidin-biotin interaction and the resulting conjugate is bound to the molecular epitopes on such surface. The conjugate is effective for imaging by x-ray, ultrasound, magnetic resonance or positron emission tomography. Compositions for use in ultrasonic imaging of natural or synthetic surfaces and for enhancing the acoustic reflectivity thereof are also disclosed.

Le procédé selon l'invention permet d'assurer une liaison à base de ligands des particules encapsulées dans des lipides à des épitopes moléculaires sur une surface in vivo ou in vitro. Selon ce procédé, on administre successivement (a) un ligand d'un site spécifique activé par un agent activateur de la biotine; (b) un agent activateur de l'avidine; et (c) des particules encapsulées dans des lipides activées par un agent activateur de la biotine, le ligand étant conjugué avec les particules par une interaction entre l'avidine et la biotine et le conjugué ainsi obtenu étant lié aux épitopes moléculaires sur ladite surface. Ce conjugué est utile en imagerie radiographique, ultrasonique, par résonance magnétique ou en tomographie par émission de positrons. L'invention concerne également des compositions utilisées en imagerie ultrasonique de surfaces naturelles ou synthétiques et pour améliorer la capacité de réflexion acoustique de ces surfaces.

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