Original Article

Inhibition of E-Selectin Gene Expression by Transforming Growth Factor ß in Endothelial Cells Involves Coactivator Integration of Smad and Nuclear Factor B–mediated Signals

Correspondence to: James N. Topper, COR Therapeutics, Inc., 256 E. Grand Ave., South San Francisco, CA 94080. Tel:650-244-7333 Fax:650-244-9270 E-mail:jtopper{at}corr.com.

Transforming growth factor (TGF)-ß₁ is a pleiotropic cytokine/growth factor that is thought to play a critical role in the modulation of inflammatory events. We demonstrate that exogenous TGF-ß₁ can inhibit the expression of the proinflammatory adhesion molecule, E-selectin, in vascular endothelium exposed to inflammatory stimuli both in vitro and in vivo. This inhibitory effect occurs at the level of transcription of the E-selectin gene and is dependent on the action of Smad proteins, a class of intracellular signaling proteins involved in mediating the cellular effects of TGF-ß₁. Furthermore, we demonstrate that these Smad-mediated effects in endothelial cells result from a novel competitive interaction between Smad proteins activated by TGF-ß₁ and nuclear factor B (NFB) proteins activated by inflammatory stimuli (such as cytokines or bacterial lipopolysaccharide) that is mediated by the transcriptional coactivator cyclic AMP response element–binding protein (CREB)-binding protein (CBP). Augmentation of the limited amount of CBP present in endothelial cells (via overexpression) or selective disruption of Smad–CBP interactions (via a dominant negative strategy) effectively antagonizes the ability of TGF-ß₁ to block proinflammatory E-selectin expression. These data thus demonstrate a novel mechanism of interaction between TGF-ß₁–regulated Smad proteins and NFB proteins regulated by inflammatory stimuli in vascular endothelial cells. This type of signaling mechanism may play an important role in the immunomodulatory actions of this cytokine/growth factor in the cardiovascular system.

Key Words: inflammation, transcription, transforming growth factor, vascular biology, endothelium

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