Novel molecular imaging ligands targeting matrix metalloproteinases 2 and 9 for imaging of unstable atherosclerotic plaques
作者:Nazanin Hakimzadeh、Victorine A. Pinas、Ger Molenaar、Vivian de Waard、Esther Lutgens、Berthe L. F. van Eck-Smit、Kora de Bruin、Jan J. Piek、Jos L. H. Eersels、Jan Booij、Hein J. Verberne、Albert D. Windhorst
DOI:10.1371/journal.pone.0187767
日期:——
Molecular imaging of matrix metalloproteinases (MMPs) may allow detection of atherosclerotic lesions vulnerable to rupture. In this study, we develop a novel radiolabelled compound that can target gelatinase MMP subtypes (MMP2/9) with high selectivity and inhibitory potency. Inhibitory potencies of several halogenated analogues of MMP subtype-selective inhibitors (N-benzenesulfonyliminodiacetyl monohydroxamates and N-halophenoxy-benzenesulfonyl iminodiacetyl monohydroxamates) were in the nanomolar range for MMP2/9. The analogue with highest inhibitory potency and selectivity was radiolabelled with [123I], resulting in moderate radiochemical yield, and high radiochemical purity. Biodistribution studies in mice, revealed stabilization in blood 1 hour after intravenous bolus injection. Intravenous infusion of the radioligand and subsequent autoradiography of excised aortas showed tracer uptake in atheroprone mice. Distribution of the radioligand showed co-localization with MMP2/9 immunohistochemical staining. In conclusion, we have developed a novel selective radiolabeled MMP2/9 inhibitor, suitable for single photon emission computed tomography (SPECT) imaging that effectively targets atherosclerotic lesions in mice.
分子影像技术对于基质金属蛋白酶(MMPs)的成像可能有助于检测易破裂的动脉粥样硬化病变。在本研究中,我们开发了一种新型放射性标记化合物,该化合物能够高度选择性地靶向明胶酶MMP亚型(MMP2/9)并具有抑制活性。几种卤素化类似物的抑制活性对于MMP亚型选择性抑制剂(N-苯磺酰亚胺二乙酸单羟肟酸和N-卤代苯氧基苯磺酰亚胺二乙酸单羟肟酸)在纳米摩尔范围内对MMP2/9有效。具有最高抑制活性和选择性的类似物被[123I]标记,产生了中等放射化学产率和高度放射化学纯度。在小鼠中的生物分布研究表明,静脉注射后1小时血液中稳定。静脉注射放射配体并随后对切除的主动脉进行自显影显示,易患动脉粥样硬化的小鼠有示踪剂摄取。放射配体的分布显示出与MMP2/9免疫组织化学染色的共定位。总之,我们开发了一种新型选择性放射性标记的MMP2/9抑制剂,适用于单光子发射计算机断层摄影术(SPECT)成像,能有效靶向小鼠的动脉粥样硬化病变。