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Am J Physiol Heart Circ Physiol 284: H1917-H1923, 2003; doi:10.1152/ajpheart.00861.2002
0363-6135/03 $5.00
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Vol. 284, Issue 6, H1917-H1923, June 2003

SPECIAL TOPICS
Regulation of Cardiovascular Signaling by Kinins and Products of Similar Converting Enzyme Systems
Upregulation of Cdc2 and cyclin A during apoptosis of endothelial cells induced by cleaved high-molecular-weight kininogen

Shujie Wang1, Muneer G. Hasham2, Irma Isordia-Salas1, Alexander Y. Tsygankov2, Robert W. Colman1, and Yan-Lin Guo1

1 Sol Sherry Thrombosis Research Center and 2 Department of Microbiology and Immunology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140

We (8) reported that the cleaved high-molecular-weight kininogen (HKa) and its domain 5 (D5) inhibited angiogenesis. Further studies (15) revealed that D5 could inhibit cell proliferation and induce apoptosis of proliferating endothelial cells, which together may represent a critical part of antiangiogenic activity of HKa and D5. In the present study, we further examined the effect of HKa on cell cycle progression and cell viability. We report that HKa induced a significant upregulation of Cdc2 and cyclin A in proliferating endothelial cells, concurrent with a marked increase of Cdc2 activity. The increased expression of Cdc2 and cyclin A by HKa was not associated with an apparent change in cell cycle profiles of basic fibroblast growth factor-stimulated proliferating cells, but closely correlated with a marked increase of apoptosis, suggesting that the elevated Cdc2 activity is involved in HKa-induced apoptosis of proliferating endothelial cells. Our results support an emerging hypothesis that Cdc2 and cyclin A are important regulators for cell cycle as well as for apoptosis.

angiogenesis; bradykinin; cell cycle


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