Decreased neointimal formation in Nox2-deficient mice reveals a direct role for NADPH oxidase in the response to arterial injury

doi:10.1073/pnas.0405389101

Decreased neointimal formation in Nox2-deficient mice reveals a direct role for NADPH oxidase in the response to arterial injury

^*Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115; ^‡Evans Memorial Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118; and ^¶Departments of Cell Biology and Cardiovascular Medicine, Cleveland Clinic Foundation, Cleveland, OH 44195

Communicated by Eugene Braunwald, Partners HealthCare System, Boston, MA, July 26, 2004 (received for review January 12, 2004)

Abstract

Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are produced, in part, from NADPH oxidase in response to host invasion and tissue injury. Defects in NADPH oxidase impair host defense; however, the role of ROS and RNS in the response to tissue injury is not known. We addressed this issue by subjecting leukocyte oxidase (Nox2)-deficient (Nox2^-/-) mice to arterial injury. Femoral artery injury was associated with increased Nox2 expression, ROS/RNS production, and oxidative protein and lipid modification in wild-type mice. In Nox2^-/- mice, RNS-mediated protein oxidation, as monitored by protein nitrotyrosine content, was significantly diminished. This was accompanied by reduced neointimal proliferation, as monitored by intimal thickness and intimal/medial ratio, in Nox2^-/- compared to wild-type mice. In addition, Nox2 deficiency led to reduced cellular proliferation and leukocyte accumulation. These data indicate that Nox2-mediated oxidant production has a requisite role in the response to tissue injury.

Footnotes

↵ § To whom correspondence may be addressed. E-mail: jkeaney{at}bu.edu or dsimon{at}rics.bwh.harvard.edu.
↵ † Z.C. and J.F.K. contributed equally to this work.
Abbreviations: ROS, reactive oxygen species; RNS, reactive nitrogen species; SMC, smooth muscle cell; Nox2^-/-, Nox2 deficient; HODE, hydroxyoctadecadienoic acids; HETE, hydroxyeicosatetraenoic acids; DHE, dihydroethidium.