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J Thorac Cardiovasc Surg 2004;127:1276-1284
© 2004 The American Association for Thoracic Surgery

Cardiopulmonary support and physiology

Vein graft arterialization causes differential activation of mitogen-activated protein kinases

^a the Seymour Cohn Cardiovascular Research Laboratory, Division of Cardiothoracic Surgery, Department of Surgery, New York University School of Medicine, New York, NY, USA

Received for publication April 4, 2003; revisions received June 2, 2003; revisions received July 30, 2003; accepted for publication July 31, 2003.

^* Address for reprints: Aubrey C. Galloway, MD, Professor of Surgery, Director, Cardiac Surgical Research, New York University School of Medicine, 530 First Ave, Suite 9V, New York, NY 10016, USA
galloway{at}cv.med.nyu.edu

OBJECTIVE: Vascular injury results in activation of the mitogen-activated protein kinases—extracellular-signal regulated kinases, c-jun N-terminal kinase, and p38^MAPK—which have been implicated in cell proliferation, migration, and apoptosis. The goal of this study was to characterize mitogen-activated protein kinase activation in arterialized vein grafts.

METHODS: Carotid artery bypass using reversed external jugular vein was performed in 29 dogs. Vein grafts were harvested after 30 minutes and 3, 8, and 24 hours, and 4, 7, 14, and 28 days. Contralateral external jugular vein and external jugular vein interposition vein-to-vein grafts were used as controls. Vein graft extracts were analyzed for extracellular-signal regulated kinases, c-jun N-terminal kinase, and p38^MAPK activation. Proliferating cell nuclear antigen expression was investigated as a parameter of cell proliferation. Apoptosis was assessed by terminal deoxynucleotidyl transferase–mediated 2'-deoxyuridine 5'-triphosphate nick end labeling staining and intimal hyperplasia by morphometric examination of tissue sections.

RESULTS: Significant intimal hyperplasia was observed at 28 days. Over the time points studied, vein graft arterialization resulted in bimodal activation of both extracellular-signal regulated kinase and p38^MAPK (30 minutes through 3 hours; 4 days) but did not induce activation of c-jun N-terminal kinase. Proliferating cell nuclear antigen expression increased from days 1 through 28, and apoptosis increased between 8 and 24 hours.

CONCLUSION: Vein graft arterialization induces bimodal activation of extracellular-signal regulated kinase and p38^MAPK; however, in contrast with what is described in arterial injury, it does not induce c-jun N-terminal kinase activation. These results provide the first comprehensive characterization of the mitogen-activated protein kinase signaling pathways activated in vein graft arterialization and identify mitogen-activated protein kinases as potential mediators of vein graft remodeling and subsequent intimal hyperplasia.

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