Imaging with radiolabelled anti-membrane type 1 matrix metalloproteinase (MT1-MMP) antibody: potentials for characterizing atherosclerotic plaques.

European Journal of Nuclear Medicine and Molecular Imaging
Yuji KugeHideo Saji

Abstract

Membrane type 1 matrix metalloproteinase (MT1-MMP) activates pro-MMP-2 and pro-MMP-13 to their active forms and plays important roles in the destabilization of atherosclerotic plaques. This study sought to determine the usefulness of (99m)Tc-labelled monoclonal antibody (mAb), recognizing MT1-MMP, for imaging atherosclerosis in a rabbit model (WHHLMI rabbits). Anti-MT1-MMP monoclonal IgG(3) and negative control IgG(3) were radiolabelled with (99m)Tc after derivatization with 6-hydrazinonicotinic acid (HYNIC) to yield (99m)Tc-MT1-MMP mAb and (99m)Tc-IgG(3), respectively. WHHLMI and control rabbits were injected with these radio-probes. The aorta was removed and radioactivity was measured at 24 h after the injection. Autoradiography and histological studies were performed. (99m)Tc-MT1-MMP mAb accumulation in WHHLMI rabbit aortas was 5.4-fold higher than that of control rabbits. Regional (99m)Tc-MT1-MMP mAb accumulation was positively correlated with MT1-MMP expression (r = 0.59, p < 0.0001), while (99m)Tc-IgG(3) accumulation was independent of MT1-MMP expression (r = 0.03, p = NS). The highest (99m)Tc-MT1-MMP mAb accumulation was found in atheromatous lesions (4.8 ± 1.9, %ID×BW/mm(2) × 10(2)), followed in decreasing order by fibr...Continue Reading

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