BACKGROUND: Inflammation within atherosclerotic lesions contributes to plaque instability and vulnerability to rupture. We set out to evaluate the use of a macrophage labeling agent to identify carotid plaque inflammation by in vivo magnetic resonance imaging (MRI). METHODS AND RESULTS: Thirty patients with symptomatic severe carotid stenosis scheduled for carotid endarterectomy underwent multi-sequence MRI of the carotid bifurcation before and after injection of ultrasmall superparamagnetic particles of iron oxide (USPIOs). USPIO particles accumulated in macrophages in 24 of 30 plaques (80%). Areas of signal intensity reduction, corresponding to USPIO/macrophage-positive histological sections, were visualized in 24 of 27 (89%) patients, with an average reduction in signal intensity induced by the USPIO particles of 24% (range, 3.1% to 60.8%). CONCLUSIONS: USPIO-enhanced MRI can identify plaque inflammation in vivo by accumulation of USPIO within macrophages in carotid plaques.
BACKGROUND:Inflammation within atherosclerotic lesions contributes to plaque instability and vulnerability to rupture. We set out to evaluate the use of a macrophage labeling agent to identify carotid plaque inflammation by in vivo magnetic resonance imaging (MRI). METHODS AND RESULTS: Thirty patients with symptomatic severe carotid stenosis scheduled for carotid endarterectomy underwent multi-sequence MRI of the carotid bifurcation before and after injection of ultrasmall superparamagnetic particles of iron oxide (USPIOs). USPIO particles accumulated in macrophages in 24 of 30 plaques (80%). Areas of signal intensity reduction, corresponding to USPIO/macrophage-positive histological sections, were visualized in 24 of 27 (89%) patients, with an average reduction in signal intensity induced by the USPIO particles of 24% (range, 3.1% to 60.8%). CONCLUSIONS: USPIO-enhanced MRI can identify plaque inflammation in vivo by accumulation of USPIO within macrophages in carotid plaques.
Authors: Shann S Yu; Ryan A Ortega; Brendan W Reagan; John A McPherson; Hak-Joon Sung; Todd D Giorgio Journal: Wiley Interdiscip Rev Nanomed Nanobiotechnol Date: 2011-08-10
Authors: Jose J Rico-Jimenez; Michael J Serafino; Sebina Shrestha; Xi Chen; Wihan Kim; Jessie Adame; L Maximillan Buja; Deborah Vela; Brian E Applegate; Javier A Jo Journal: Atherosclerosis Date: 2019-04-19 Impact factor: 5.162
Authors: Tjun Y Tang; Simon P S Howarth; Sam R Miller; Martin J Graves; Jean-Marie U-King-Im; Rikin A Trivedi; Zhi Yong Li; Stewart R Walsh; Andrew P Brown; Peter J Kirkpatrick; Michael E Gaunt; Jonathan H Gillard Journal: J Neurol Neurosurg Psychiatry Date: 2007-06-19 Impact factor: 10.154
Authors: A Millon; S D Dickson; A Klink; D Izquierdo-Garcia; J Bini; E Lancelot; S Ballet; P Robert; J Mateo de Castro; C Corot; Z A Fayad Journal: Atherosclerosis Date: 2013-03-26 Impact factor: 5.162