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

Paul C. Saunders, Giuseppe Pintucci, Costas S. Bizekis, Ram Sharony, Kevin M. Hyman, Fiorella Saponara, F. Gregory Baumann, Eugene A. Grossi, Stephen B. Colvin, Paolo Mignatti, Aubrey C. Galloway*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Objective: Vascular injury results in activation of the mitogen-activated protein kinases-extracellular-signal regulated kinases, c-jun N-terminal kinase, and p38MAPK-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 p38MAPK 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 p38MAPK (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 p38MAPK; 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.

Original languageEnglish
Pages (from-to)1276-1284
Number of pages9
JournalJournal of Thoracic and Cardiovascular Surgery
Issue number5
StatePublished - May 2004
Externally publishedYes


FundersFunder number
Seymour Cohn Foundation for Cardiovascular Surgery Research


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