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Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin.

Publication ,  Journal Article
Braun-Dullaeus, RC; Mann, MJ; Seay, U; Zhang, L; von Der Leyen, HE; Morris, RE; Dzau, VJ
Published in: Arterioscler Thromb Vasc Biol
July 2001

Cell cycle progression represents a key event in vascular proliferative diseases, one that depends on an increased rate of protein synthesis. An increase in phosphatidylinositol 3-kinase (PI 3-kinase) activity is associated with vascular smooth muscle cell proliferation, and rapamycin, which blocks the activity of the mammalian target of rapamycin, inhibits this proliferation in vitro and in vivo. We hypothesized that these 2 molecules converge on a critical pathway of translational regulation that is essential for successful upregulation of cell cycle-regulatory proteins in activated smooth muscle cells. p70(S6) kinase, a target of PI 3-kinase and the mammalian target of rapamycin, was rapidly activated on growth factor stimulation of quiescent coronary artery smooth muscle cells and after balloon injury of rat carotid arteries. The translational repressor protein 4E-binding protein 1 was similarly hyperphosphorylated under these conditions. These events were associated with increases in the protein levels of cyclin B1, cyclin D1, cyclin E, cyclin-dependent kinase 1, cyclin-dependent kinase 2, proliferating cell nuclear antigen, and p21(Cip1) in vivo and in vitro, whereas inhibition of the PI 3-kinase signaling pathway with either rapamycin or wortmannin blocked the upregulation of these cell cycle proteins, but not mRNA, and arrested the cells in vitro before S phase. In contrast to findings in other cell types, growth factor- or balloon injury-induced downregulation of the cell cycle inhibitor p27(Kip1) was not affected by rapamycin treatment. These data suggest that cell cycle progression in vascular cells in vitro and in vivo depends on the integrity of the PI 3-kinase signaling pathway in allowing posttranscriptional accumulation of cell cycle proteins.

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Published In

Arterioscler Thromb Vasc Biol

DOI

EISSN

1524-4636

Publication Date

July 2001

Volume

21

Issue

7

Start / End Page

1152 / 1158

Location

United States

Related Subject Headings

  • Sirolimus
  • Signal Transduction
  • Ribosomal Protein S6 Kinases
  • Rats, Sprague-Dawley
  • Rats
  • RNA, Messenger
  • Protein Biosynthesis
  • Phosphorylation
  • Phosphoproteins
  • Phosphatidylinositol 3-Kinases
 

Citation

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Braun-Dullaeus, R. C., Mann, M. J., Seay, U., Zhang, L., von Der Leyen, H. E., Morris, R. E., & Dzau, V. J. (2001). Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin. Arterioscler Thromb Vasc Biol, 21(7), 1152–1158. https://doi.org/10.1161/hq0701.092104
Braun-Dullaeus, R. C., M. J. Mann, U. Seay, L. Zhang, H. E. von Der Leyen, R. E. Morris, and V. J. Dzau. “Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin.Arterioscler Thromb Vasc Biol 21, no. 7 (July 2001): 1152–58. https://doi.org/10.1161/hq0701.092104.
Braun-Dullaeus RC, Mann MJ, Seay U, Zhang L, von Der Leyen HE, Morris RE, et al. Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin. Arterioscler Thromb Vasc Biol. 2001 Jul;21(7):1152–8.
Braun-Dullaeus, R. C., et al. “Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin.Arterioscler Thromb Vasc Biol, vol. 21, no. 7, July 2001, pp. 1152–58. Pubmed, doi:10.1161/hq0701.092104.
Braun-Dullaeus RC, Mann MJ, Seay U, Zhang L, von Der Leyen HE, Morris RE, Dzau VJ. Cell cycle protein expression in vascular smooth muscle cells in vitro and in vivo is regulated through phosphatidylinositol 3-kinase and mammalian target of rapamycin. Arterioscler Thromb Vasc Biol. 2001 Jul;21(7):1152–1158.

Published In

Arterioscler Thromb Vasc Biol

DOI

EISSN

1524-4636

Publication Date

July 2001

Volume

21

Issue

7

Start / End Page

1152 / 1158

Location

United States

Related Subject Headings

  • Sirolimus
  • Signal Transduction
  • Ribosomal Protein S6 Kinases
  • Rats, Sprague-Dawley
  • Rats
  • RNA, Messenger
  • Protein Biosynthesis
  • Phosphorylation
  • Phosphoproteins
  • Phosphatidylinositol 3-Kinases