Journal article
The Bradykinin B2 Receptor Is a Delayed Early Response Gene for Platelet-derived Growth Factor in Arterial Smooth Muscle Cells
The Journal of biological chemistry, Vol.271(23), pp.13324-13332
06/07/1996
DOI: 10.1074/jbc.271.23.13324
PMID: 8662783
Abstract
Bradykinin and platelet-derived growth factor (PDGF) are inflammatory mediators important in the response to vascular injury. Based upon the known effect of oncogenic Ras to increase bradykinin receptor expression and the ability of PDGF to stimulate Ras, we examined whether PDGF regulates bradykinin B2 receptor expression in cultured arterial smooth muscle cells. Treatment with PDGF (AB and BB, but not AA) produced a dose- and time-dependent increase in both mRNA (6-7-fold increase at 2-4 h) and cell surface receptors (2-4-fold at 6-12 h) for the B2 receptor. There was a 60-min delay between exposure to PDGF and the initial increase in B2 receptor mRNA. Transcriptional inhibitors, actinomycin D or 5,6-dichloro-1-β-D-ribofuranosylbenzimidazole, completely blocked the increase in B2 receptor mRNA when added up to 60 min after stimulation with PDGF. However, protein synthesis was not required, as treatment with cycloheximide did not block but rather superinduced the PDGF-induced increase in B2 receptor mRNA. Comparison with the immediate early response gene c-fos demonstrated that the increase in B2 receptor mRNA was similarly inhibited by the tyrosine kinase inhibitor, tyrphostin, as well as staurosporine. However, stimulation of c-fos was slightly more sensitive to genistein, while the B2 receptor mRNA was more sensitive to inhibition by the protein kinase C inhibitor, calphostin C. The increase in cell surface B2 receptors were functionally coupled to an increase in phosphoinositide-specific phospholipase C, and the effects of PDGF were selective as there was no increase in either angiotensin II- or arginine vasopressin-induced inositol phosphate formation or intracellular calcium release. Taken together, these results demonstrate that the B2 receptor is a delayed early response gene for PDGF in vascular smooth muscle cells.
Details
- Title: Subtitle
- The Bradykinin B2 Receptor Is a Delayed Early Response Gene for Platelet-derived Growth Factor in Arterial Smooth Muscle Cells
- Creators
- Bradley S Dixon - Departments of Medicine and Anatomy, University of Iowa College of Medicine and Veterans Affairs Medical Center, Iowa City, Iowa 52242Ram V Sharma - Departments of Medicine and Anatomy, University of Iowa College of Medicine and Veterans Affairs Medical Center, Iowa City, Iowa 52242Michael J Dennis - Departments of Medicine and Anatomy, University of Iowa College of Medicine and Veterans Affairs Medical Center, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- The Journal of biological chemistry, Vol.271(23), pp.13324-13332
- DOI
- 10.1074/jbc.271.23.13324
- PMID
- 8662783
- NLM abbreviation
- J Biol Chem
- ISSN
- 0021-9258
- eISSN
- 1083-351X
- Publisher
- Elsevier Inc
- Language
- English
- Date published
- 06/07/1996
- Academic Unit
- Nephrology; Internal Medicine
- Record Identifier
- 9984094584002771
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