Arteriosclerosis and Thrombosis, Vol 14, 1021-1031, Copyright © 1994 by American Heart Association

ARTICLES

Regulation of cyclooxygenase-2 expression in aortic smooth muscle cells

JA Rimarachin, JA Jacobson, P Szabo, J Maclouf, C Creminon and BB Weksler
Division of Hematology-Oncology, Cornell University Medical College, New York, NY 10021.

Activation of the gene for inducible cyclooxygenase (cyclooxygenase-2 [Cox-2], prostaglandin endoperoxide synthase) is an early response to injury in vascular smooth muscle cells. We used in vitro and in vivo models to demonstrate that activation of quiescent smooth muscle cells by mitogens leads to a rapid, short-term rise in mRNA for Cox-2, followed by synthesis of new Cox-2 enzyme protein and a marked increase in prostaglandin production that depends on new enzyme synthesis. Moreover, the Cox-2 mRNA response observed in smooth muscle cells differs in both time and degree, depending on the particular mitogenic stimulus. Serum, platelet-derived growth factor, epidermal growth factor, and thrombin are strong inducers of Cox-2 mRNA, whereas acidic and basic fibroblast growth factors and interleukin-1 alpha are weak inducers. In contrast to the transient activation of Cox-2 in vitro after introduction of a mitogenic stimulus, the Cox-2 response after in vivo vascular injury extends over many days and may represent protracted cellular activation. During induction of Cox-2 message and protein, expression of constitutive cyclooxygenase (Cox-1) remains unchanged, however. These data suggest a pathophysiological role for Cox-2 in the early modulation of vascular responses to injury.

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