Oxidized LDL/CD36 interaction induces loss of cell polarity and inhibits macrophage locomotion

Young Mi Park, Judith A. Drazba, Amit Vasanji, Thomas Egelhoff, Maria Febbraio, Roy L. Silverstein

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Cell polarization is essential for migration and the exploratory function of leukocytes. However, the mechanism by which cells maintain polarity or how cells revert to the immobilized state by gaining cellular symmetry is not clear. Previously we showed that interaction between oxidized low-density lipoprotein (oxLDL) and CD36 inhibits macrophage migration; in the current study we tested the hypothesis that oxLDL/CD36-induced inhibition of migration is the result of intracellular signals that regulate cell polarity. Live cell imaging of macrophages showed that oxLDL actuated retraction of macrophage front end lamellipodia and induced loss of cell polarity. Cd36 null and macrophages null for Vav, a guanine nucleotide exchange factor (GEF), did not show this effect. These findings were caused by Rac-mediated inhibition of nonmuscle myosin II, a cell polarity determinant. OxLDL induced dephosphorylation of myosin regulatory light chain (MRLC) by increasing the activity of Rac. Six-thioguanine triphosphate (6-thio-GTP), which inhibits Vav-mediated activation of Rac, abrogated the effect of oxLDL. Activation of the Vav-Rac-myosin II pathway by oxidant stress may induce trapping of macrophages at sites of chronic inflammation such as atherosclerotic plaque.

Original languageEnglish
Pages (from-to)3057-3068
Number of pages12
JournalMolecular Biology of the Cell
Volume23
Issue number16
DOIs
StatePublished - 15 Aug 2012

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