期刊
LIFE SCIENCES
卷 74, 期 2-3, 页码 143-153出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.lfs.2003.09.031
关键词
G-protein coupled receptors; prostaglandins; PGE2; cAMP; cancer
资金
- NEI NIH HHS [EY11291] Funding Source: Medline
The EP2 and EP4 prostanoid receptors are two of the four subtypes of receptors for prostaglandin E-2 (PGE(2)). They are in the family of G-protein coupled receptors and both receptors were initially characterized as coupling to Gs and increasing intracellular cAMP formation. Recently, however, we have shown that both receptors can stimulate T-cell factor (Tcf) mediated transcriptional activity. The EP2 receptor does this primarily through cAMP-dependent protein kinase (PKA), whereas the EP4 utilizes phosphatidylinositol 3-kinase (PI3K) as well as PKA. In addition, we have shown that the EP4 receptor, but not the EP2, can activate the extracellular signal-regulated kinases (ERKs) I and 2 by way of PI3K leading to the induction of early growth response factor-1 (EGR-1), a transcription factor traditionally associated with wound healing. This induction of EGR-1 expression has significant implications concerning the potential role of PGE(2) in cancer and inflammatory disorders. (C) 2003 Elsevier Inc. All rights reserved.
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