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(Circulation. 1999;99:2310-2316.)
© 1999 American Heart Association, Inc.

Basic Science Reports

Monocyte Chemoattractant Protein-1 but Not Tumor Necrosis Factor- Is Correlated With Monocyte Infiltration in Mouse Lipid Lesions

Jill Reckless, BSc, PhD; Edward M. Rubin, MD, PhD; Judy B. Verstuyft, BA; James C. Metcalfe, MA, PhD; David J. Grainger, MA, PhD

From the Departments of Biochemistry and Medicine, University of Cambridge (UK) (J.R., J.C.M., D.J.G.), and Life Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley (E.M.R., J.B.V.).

Correspondence to Jill Reckless, Department of Medicine, University of Cambridge, Addenbrookes Hospital, Box 157, Hills Rd, Cambridge CB2 2QQ UK. E-mail jr219{at}mole.bio.cam.ac.uk

Background—Apolipoprotein (apo)(a) transgenic mice and C57BL/6 mice fed a high fat diet develop similar-sized lipid lesions, but lesions in apo(a) mice are devoid of macrophages. We used this observation to identify which proinflammatory proteins might be involved in mediating monocyte recruitment during atherogenesis.

Methods and Results—Macrophage-deficient apo(a) transgenic mouse lesions contained similar levels of several different proinflammatory proteins, both adhesion molecules (intercellular adhesion molecule-1 [ICAM-1] and vascular cell adhesion molecule-1 [VCAM-1]) and cytokines (tumor necrosis factor- [TNF-] and macrophage inflammatory protein-1 [MIP-1]), similar to the macrophage-rich lesions of C57BL/6 mice.

Conclusions—From this we conclude that ICAM-1, VCAM-1, TNF-, and MIP-1 may all be necessary for vascular monocyte recruitment in vivo, but they cannot be sufficient. Monocyte chemoattractant protein-1 (MCP-1) protein was undetectable in the vessel wall taken from apo(a) transgenic mice fed a high fat diet compared with high expression in mice with lipid lesions (C57BL/6 and apoE knockout mice). Therefore elevated expression of MCP-1 but not TNF-, MIP-1, ICAM-1, or VCAM-1 is correlated with vascular macrophage accumulation. To test the hypothesis that monocyte infiltration during atherogenesis is MCP-1 dependent, it will be necessary to develop specific pharmacological inhibitors of MCP-1 activity.

Key Words: atherosclerosis • monocytes • aorta • lipids • lesion

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