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Cell cycle related inhibition of mouse vascular smooth muscle cell proliferation by prostaglandin E1: relationship between prostaglandin E1 and intracellular cAMP levels.

Authors
  • Fan, Y Y
  • Ramos, K S
  • Chapkin, R S
Type
Published Article
Journal
Prostaglandins Leukotrienes and Essential Fatty Acids
Publisher
Elsevier
Publication Date
Feb 01, 1996
Volume
54
Issue
2
Pages
101–107
Identifiers
PMID: 8848428
Source
Medline
License
Unknown

Abstract

Elucidation of the cellular and molecular mechanisms which regulate vascular smooth muscle cell proliferation is critical to the understanding of atherogenesis. The present studies were conducted to evaluate the relationship between prostaglandin E1 (PGE1) and cAMP in the regulation of DNA synthesis in mouse vascular smooth muscle cells (SMCs). Quiescent cultures of SMCs were challenged with 10% fetal bovine serum to initiate cell cycle transit and PGE1 (10 microM) or dibutyryl cAMP (1, 10, 100 microM) added at 0, 8, 16, 24, and 32 h. DNA synthesis as measured by [3H] thymidine incorporation and intracellular cAMP levels were measured 24 h following individual treatments. PGE1 modulated DNA synthesis in a cell cycle related fashion, with inhibition only observed in cells challenged 16 h or longer following initiation of cell cycle transit. The decrease in DNA synthesis induced by PGE1 was associated with increased intracellular cAMP levels at 16 and 24 h, but not 32 h. Exposure of SMCs to dibutyryl-cAMP also inhibited DNA synthesis in a cell cycle related fashion, with the most pronounced effect seen at 16 h. These results demonstrate that the effects of PGE1 are restricted to a defined period within the cell cycle following S phase entry and implicate modulation of intracellular cAMP levels in the inhibitory response.

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