Publikation

Reduced in vivo aortic uptake of radiolabeled oxidation-specific antibodies reflects changes in plaque composition consistent with plaque stabilization

Wissenschaftlicher Artikel/Review - 01.12.2004

PubMed
DOI

Zitation
Torzewski M, Shaw P, Han K, Shortal B, Lackner K, Witztum J, Palinski W, Tsimikas S. Reduced in vivo aortic uptake of radiolabeled oxidation-specific antibodies reflects changes in plaque composition consistent with plaque stabilization. Arterioscler Thromb Vasc Biol 2004; 24:2307-12.
Art
Wissenschaftlicher Artikel/Review (Englisch)
Zeitschrift
Arterioscler Thromb Vasc Biol 2004; 24
Veröffentlichungsdatum
01.12.2004
eISSN (Online)
1524-4636
Seiten
2307-12
Kurzbeschreibung/Zielsetzung

OBJECTIVE: Labeled oxidation-specific antibodies (Ox-AB) detect, quantify, and noninvasively image lipid-rich atherosclerotic lesions. However, it is unknown whether Ox-AB detect plaque stabilization. METHODS AND RESULTS: The aortic uptake of intravenously injected 125I-MDA2 (Ox-AB to malondialdehyde [MDA]-low-density lipoprotein [LDL]) was quantitated in: (1) LDL receptor-/- mice with established atherosclerosis continued on Western diet (Progression) or switched to chow (Regression) or chow+vitamins E and C (Regression-VIT) for 6 months; and (2) Watanabe rabbits (3- to 57-months old) with naturally evolved atherosclerotic lesions. In mice, the Progression group had more extensive atherosclerosis, higher 125I-MDA2 uptake, high concordance of Sudan (lipid)-staining and 125I-MDA2 uptake, and stronger oxidized LDL (OxLDL) and macrophage immunostaining than both Regression groups. In contrast, the Regression groups showed Sudan-positive lesions with focally diminished 125I-MDA2 uptake, which coincided with reduced OxLDL and macrophages but more smooth muscle cells (SMCs) and collagen. In rabbits, areas of increased 125I-MDA2 uptake were associated with high Sudan concordance and strong immunostaining for OxLDL and macrophages. Interestingly, advanced lesions with focally diminished 125I-MDA2 uptake showed stronger immunostaining for SMCs and collagen, particularly at the fibrous cap. CONCLUSIONS: Ox-AB uptake is focally diminished in plaques displaying accepted features of plaque stability. Imaging techniques to detect the presence and depletion of OxLDL may be useful in assessing plaque stabilization.