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Prostaglandin E2 (PGE2) mediates a wide range of biological effects including anti-inflammatory effects,airway resistance in asthma, fertility and maintenance of vascular tone. The precise identity of the receptors which mediate these effects are unclear. A main focus of Dr. Breyer?s research is the characterization of the molecular mechanism of action of PGE2 and determination of the structure-function relationships of the PGE2 receptors. Dr. Breyer’s group is currently investigating alterations in immune/inflammatory cells function in hypertension and type 2 diabetes using both the PGE2 EP receptor knockout mice and small molecule antagonists. T
A second project in the laboratory involves using the EP3 receptors as a model system to study multiple signal transduction pathways activated by these G-protein coupled receptors. The prostaglandin EP3 receptor signals primarily through the inhibitory G-protein Gi, thereby decreasing intracellular cAMP levels, however preliminary studies have described a non-Gi coupled signal transduction pathway activated by the this receptor. Partial blockade of this novel signal transduction pathway with kinase inhibitors demonstrates that this pathway is transduced in part by a Ca++ dependent kinase pathway. Studies are underway to determine the downstream regulators which mediate this signal transduction pathway.
In addition Dr. Breyer?s lab has recently developed the technology for purifying milligram quantities of the recombinant G-protein coupled receptors. The goal of this project is to utilize this purified receptor protein to undertake biochemical characterization of the receptor protein, identify interacting proteins, and ultimately to determine the three dimensional structure of one of these receptors
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Shigekuni Okumura,Utako Yokoyama,Sayuki Oka,Takako Sasaki,Marion Anne Cooley,Yuko Hidaka,Shota Tanifuji,Mari Kaneko,Takaya Abe,Richard M Breyer, Hiroshi Homma,Yuko Kato
bioRxiv (Cold Spring Harbor Laboratory) (2023)
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Allergyno. 3 (2022): 714-730
Ashley A. Christensen,Spencer R. Andrei,Jennifer C. Dunn, Valerie F. Ricciardi, William A. Pace,Richard M. Breyer,Maureen Gannon
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