Once adherent, some white blood cells migrate into the intima

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Once adherent, some white blood cells migrate into the intima Once adherent, some white blood cells migrate into the intima. The directed migration of leukocytes probably depends on chemoattractant factors, including modified lipoprotein particles themselves and chemoattractant cytokines (depicted by the smaller green spheres), such as the chemokine macrophage chemoattractant protein-1 produced by vascular wall cells in response to modified lipoproteins. Leukocytes in the evolving fatty streak can divide and exhibit augmented expression of receptors for modified lipoproteins (scavenger receptors). These mononuclear phagocytes ingest lipids and become foam cells, represented by a cytoplasm filled with lipid droplets. As the fatty streak evolves into a more complicated atherosclerotic lesion, smooth-muscle cells migrate from the media (bottom of lower panel hairline) through the internal elastic membrane (solid wavy line) and accumulate within the expanding intima, where they lay down extracellular matrix that forms the bulk of the advanced lesion (bottom panel, right side). Source: The Pathogenesis, Prevention, and Treatment of Atherosclerosis, Harrison's Principles of Internal Medicine, 19e Citation: Kasper D, Fauci A, Hauser S, Longo D, Jameson J, Loscalzo J. Harrison's Principles of Internal Medicine, 19e; 2015 Available at: https://accesspharmacy.mhmedical.com/DownloadImage.aspx?image=/data/Books/1130/kas_ch291e_f001.png&sec=98722892&BookID=1130&ChapterSecID=79743366&imagename= Accessed: October 31, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved