Upregulation of Cdc2 and cyclin A during apoptosis of endothelial cells induced by cleaved high-molecular-weight kininogen.
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.
Sol Sherry Thrombosis Research Center, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, USA.
Shujie
S
Wang
Muneer G
MG
Hasham
Irma
I
Isordia-Salas
Alexander Y
AY
Tsygankov
Robert W
RW
Colman
Yan-Lin
YL
Guo
D017302:Annexins / Q000737:chemistry / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D015153:Blotting, Western; D016203:CDC2 Protein Kinase / Q000096:biosynthesis*; D002453:Cell Cycle / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D002478:Cells, Cultured; D019925:Cyclin A / Q000096:biosynthesis*; D004247:DNA / Q000096:biosynthesis; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D016650:Fluorescein-5-isothiocyanate / Q000737:chemistry; D006801:Humans; D019679:Kininogen, High-Molecular-Weight / Q000494:pharmacology*; D013997:Time Factors; D015854:Up-Regulation / Q000502:physiology
D017302:Annexins; D019925:Cyclin A; D019679:Kininogen, High-Molecular-Weight; D004247:DNA; D016203:CDC2 Protein Kinase; D016650:Fluorescein-5-isothiocyanate