Journal
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Volume 404, Issue 2, Pages 302-308Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0003-9861(02)00276-X
Keywords
prostaglandin E-2; PGE(2) receptors; fibrosis; wound healing; collagen; cAMP; connective tissue growth factor; transforming growth factor beta; Rat-I cells; neonatal rat vascular smooth muscle cells
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Funding
- NHLBI NIH HHS [HL25776] Funding Source: Medline
- NIA NIH HHS [AG00115] Funding Source: Medline
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Wild-type (WT) Rat-1 fibroblasts express undetectable quantities of the prostaglandin E-2, (PGE(2)) EP1, EP2, and EP3 receptor types and detectable amounts of the EP4 receptor. In the WT Rat-1. PGE(2) enhances connective tissue growth factor (CTGF) mRNA. PGE(2) does not stimulate cAMP production in these cells. However, forskolin induces cAMP production and ablates TGFbeta-stimulated increases in CTGF mRNA. A similar pattern of CTGF expression in response to PGF(2) and forskolin is observed in neonatal rat primary smooth muscle cell cultures. When WT Rat-1 cells are stably transfected with the EP2 receptor, PGE(2) causes a sizable elevation in intracellular cAMP and ablates the TGFbeta-stimulated increase in CTGF mRNA. PGE(2) does not have this effect on cells expressing the EP1, EP3, or EP4 receptor subtypes. These results demonstrate the importance of the EP2 receptor and cAMP in the inhibition of TGFbeta-stimulated CTGF production and suggest a role for PGE(2) in increasing CTGF mRNA levels in the absence of the EP2 receptor. Involvement of inositol phosphate in this upregulation of CTGF expression by PGE(2) is doubtful. None of the cell lines containing the four EP transfectants nor the WT Rat-1 cells responded to PGE(2) with inositol phosphate production. (C) 2002 Elsevier Science (USA). All rights reserved.
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