Abstract
Prostacyclin (PGI(2)) and its stable analogue carbacyclin (cPGI(2)) are known to trigger the protein kinase A pathway after binding to the cell surface IP receptor and to promote or enhance terminal differentiation of adipose precursor cells to adipose cells. The early expression of C/EBPbeta and C/EBPdelta is known to be critical for adipocyte differentiation in vitro as well as in vivo. We report herein that in Ob1771 and 3T3-F442A preadipose cells, activation of the IP receptor by specific agonists (PGI(2), cPGI(2) and BMY 45778) is sufficient to up-regulate rapidly the expression of C/EBPbeta and C/EBPdelta. Cyclic AMP-elevating agents are able to substitute for IP receptor agonists, in agreement with the coupling of IP receptor to adenylate cyclase. Consistent with the fact that PGI(2) is released from preadipose cells and behaves as a paracrine/autocrine effector of adipose cell differentiation, the present results favor a key role of prostacyclin by means of the IP receptor and its intracellular signaling pathway in eliciting the critical early expression of both transcription factors.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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3T3 Cells
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Adipocytes / cytology
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Adipocytes / metabolism*
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Animals
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CCAAT-Enhancer-Binding Proteins
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Carrier Proteins / genetics
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Cell Differentiation
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Clone Cells
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Colforsin / administration & dosage
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Cyclic AMP / metabolism
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DNA-Binding Proteins / genetics*
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Epoprostenol / metabolism
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Fatty Acid-Binding Protein 7
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Fatty Acid-Binding Proteins
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Kinetics
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Mice
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Myelin P2 Protein / genetics
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Neoplasm Proteins*
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Nerve Tissue Proteins*
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Nuclear Proteins / genetics*
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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Receptors, Cytoplasmic and Nuclear / metabolism
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Receptors, Epoprostenol
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Receptors, Prostaglandin / agonists
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Receptors, Prostaglandin / metabolism*
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Rosiglitazone
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Signal Transduction
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Stem Cells / cytology
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Stem Cells / metabolism
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Thiazoles / administration & dosage
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Thiazolidinediones*
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Transcription Factors / metabolism
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Up-Regulation
Substances
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CCAAT-Enhancer-Binding Proteins
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Carrier Proteins
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DNA-Binding Proteins
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Fabp5 protein, mouse
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Fabp7 protein, mouse
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Fatty Acid-Binding Protein 7
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Fatty Acid-Binding Proteins
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Myelin P2 Protein
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Neoplasm Proteins
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Nerve Tissue Proteins
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Nuclear Proteins
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RNA, Messenger
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Receptors, Cytoplasmic and Nuclear
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Receptors, Epoprostenol
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Receptors, Prostaglandin
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Thiazoles
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Thiazolidinediones
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Transcription Factors
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Rosiglitazone
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Colforsin
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Epoprostenol
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Cyclic AMP