p47phox is required for atherosclerotic lesion progression in ApoE–/– mice
Patricia A. Barry-Lane, … , Edward T.H. Yeh, Marschall S. Runge
Patricia A. Barry-Lane, … , Edward T.H. Yeh, Marschall S. Runge
Published November 15, 2001
Citation Information: J Clin Invest. 2001;108(10):1513-1522. https://doi.org/10.1172/JCI11927.
View: Text | PDF
Article

p47phox is required for atherosclerotic lesion progression in ApoE–/– mice

Abstract

NADPH oxidase is upregulated in smooth muscle cells (SMCs) in response to growth factor stimulation, concomitant with increased reactive oxygen species (ROS) production. We investigated the role of ROS production by NADPH oxidase in SMC responses to growth factors and in atherosclerotic lesion formation in ApoE–/– mice. SMCs from wild-type, p47phox–/–, and gp91phox–/– mice differed markedly with respect to growth factor responsiveness and ROS generation. p47phox–/– SMCs had diminished superoxide production and a decreased proliferative response to growth factors compared with wild-type cells, whereas the response of gp91phox–/– SMCs was indistinguishable from that of wild-type SMCs. The relevance of these in vitro observations was tested by measuring atherosclerotic lesion formation in genetically modified (wild-type, p47phox–/–, ApoE–/–, and ApoE–/–/p47phox–/–) mice. ApoE–/–/p47phox–/– mice had less total lesion area than ApoE–/– mice, regardless of whether mice were fed standard chow or a high-fat diet. Together, these studies provide convincing support for the hypothesis that superoxide generation in general, and NADPH oxidase in particular, have a requisite role in atherosclerotic lesion formation, and they provide a rationale for further studies to dissect the contributions of ROS to vascular lesion formation.

Authors

Patricia A. Barry-Lane, Cam Patterson, Marié van der Merwe, Zhaoyong Hu, Stephen M. Holland, Edward T.H. Yeh, Marschall S. Runge

×

Figure 7

Options: View larger image (or click on image) Download as PowerPoint
Comparison of oil red O–positive lesion size in mice on a high-fat diet....
Comparison of oil red O–positive lesion size in mice on a high-fat diet. Lesions were measured from whole aortas (a) and the aortic sinus (b). Aortas from 18-week-old ApoE–/–/p47phox–/– male mice maintained on a high-fat diet for 10 weeks had decreased total aortic lesion size compared with ApoE–/– mice of the same age. There is an approximately 67% decrease in lesion size in ApoE–/–/p47phox–/– mice compared with ApoE–/– mice on a high-fat diet. There is no detectable difference between these two genotypes when the aortic sinus lesions are compared (b). **P < 0.05.