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J Thorac Cardiovasc Surg 2004;128:595-601
© 2004 The American Association for Thoracic Surgery

Cardiopulmonary support and physiology

Homozygous deletion of early growth response 1 gene and critical limb ischemia after vascular ligation in mice: Evidence for a central role in vascular homeostasis

^a Evanston Northwestern Healthcare, Evanston, Ill, USA
^b Washington University, St Louis, Mo, USA
^c Lexicon Genetics, Inc, The Woodlands, Tex, USA
^d Weill Medical College of Cornell University, New York, NY, USA
^e Feinberg School of Medicine of Northwestern University, Chicago, Ill, USA

Received for publication November 26, 2003; revisions received January 20, 2004; accepted for publication February 23, 2004.

^* Address for reprints: Todd K. Rosengart, MD, 2650 Ridge Ave, Burch 100, Evanston, IL 60201, USA
trosengart{at}enh.org

BACKGROUND: The early growth response 1 gene (Egr1) encodes for an immediate to early response transcription factor that is upregulated by changes in vascular strain and hypoxia and in turn upregulates the downstream expressions of a number of angiogenic growth factors. We therefore hypothesized that early growth response 1 may be a critical early messenger governing revascularization in the setting of acute vascular occlusions.

METHODS: C57 BL/6 mice deficient in the Egr1 gene (knockout) and their wild-type litter mates underwent ligation and excision of the femoral artery with or without the previous administration of 2.7 x 10⁹ particle units of an adenoviral vector coding for the vascular endothelial growth factor gene (VEGF) or Egr1. Distal hind limb perfusion was serially measured in these animals with laser Doppler perfusion imaging.

RESULTS: Wild-type mice (n = 9) had nearly complete restitution of hind limb perfusion by day 35 after ligation. In contrast, all noninjected Egr1 knockout mice (n = 5) had severe ipsilateral limb necrosis develop between 1 and 4 days after ligation (P < .0001). Egr1 knockout mice injected with VEGF vector (n = 4) demonstrated significantly improved perfusion relative to baseline by postligation day 28, which persisted to postligation day 35 (P < .05). Egr1 knockout animals injected with Egr1 vector (n = 7) demonstrated a partial recovery of hind limb perfusion relative to VEGF vector–treated knockout animals at postligation day 4 (P < .01), which persisted to day 35.

CONCLUSIONS: These findings suggest that early growth response 1 plays a pivotal role in reperfusion responses to vascular occlusion in mice and possibly other mammals.

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