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|Title:||Radiolabeled compounds for thrombus imaging|
|Abstract:||This invention relates to radiolabeled scintigraphic imaging agents, and methods and reagents for producing such agents. Specifically, the invention relates to specific binding compounds, including peptides, that bind to a platelet receptor that is the platelet GPIIb/IIIa receptor, methods and kits for making such compounds, and methods for using such compounds labeled with technetium-99m via a covalently-linked radiolabel-binding moiety to image thrombi in a mammalian body.|
|Inventor(s):||Dean; Richard T. (Bedford, NH), Lister-James; John (Bedford, NH)|
|Assignee:||Diatide, Inc. (Londonderry, NH)|
|Filing Date:||Jun 19, 1998|
|Claims:||1. A method of imaging a thrombus within a mammalian body comprising the steps of: |
a) administering an effective diagnostic amount of a radiolabeled reagent comprising
i) a radiolabel complexing moiety; and
ii) a platelet glycoprotein IIb/IIIa-binding compound covalently linked to the moiety and having a molecular weight less than 10,000 daltons;
wherein said reagent is capable of inhibiting human platelet aggregation in platelet-rich plasma by 50% when present at a concentration not greater than about 1 .mu.M; and
b) detecting a radiolabel localized at said thrombus.
2. The method of claim 1, wherein the radiolabel is selected from the group consisting of technetium-99m, indium-111, and gallium-68.
3. The method of claim 2, wherein the radiolabel is technetium-99m.
4. The method of claim 3, wherein the reagent is CH.sub.2 CO--Y.sub.D ApcGDCGGC.sub.Acm GC.sub.Acm GGC.amide.