Diagnostic method for atherosclerosis

G - Physics – 01 – N

Patent

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G01N 33/53 (2006.01)

Patent

CA 2527196

The invention relates to a method of identifying/monitoring active atherosclerotic plaques associated with blood vessel walls wherein the plaques comprise activated macrophages having accessible binding sites for a ligand. The method comprises the steps of administering to a patient being evaluated for atherosclerosis an effective amount of a composition comprising a conjugate of a ligand and a chromophore capable of emitting light under predetermined conditions, allowing sufficient time for the ligand conjugate to bind to the activated macrophages, subjecting the blood vessels to the predetermined conditions using a catheter-based device, and identifying active plaques by detecting light emitted by the chromophore using a catheter-based device. The invention also relates to a similar method wherein a chemical moiety capable of emitting radiation is conjugated to the ligand.

L'invention concerne un procédé permettant l'identification ou la surveillance des plaques d'athérosclérose associées aux parois des vaisseaux sanguins, ces plaques comprenant des macrophages activés disposant de sites de liaisons accessibles pour un ligand. A cet effet, on administre au patient chez qui rechercher l'athérosclérose une quantité suffisante d'une composition comprenant un conjugué d'un ligand avec un chromophore capable d'émettre de la lumière dans des conditions définies. On donne assez de temps au conjugué à ligand pour se lier aux macrophages activés, puis, utilisant un dispositif à cathéter, on expose les vaisseaux sanguins aux conditions définies. Il suffit dès lors, pour identifier les plaques actives, d'utiliser un dispositif à cathéter détectant la lumière émise par le chromophore. L'invention concerne également des procédés analogues où un groupe fonctionnel chimique capable d'émettre un rayonnement est conjugué au ligand.

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