Agonist-Induced Receptor Internalization in Chinese Hamster Ovary Cells Stably Co-expressing β<sub>1</sub>- and β<sub>2</sub>-Adrenergic Receptors
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- Yoshihara Takako
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
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- Yonoki Yuzuru
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
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- Saito Maki
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
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- Nakahara Tsutomu
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
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- Sakamoto Kenji
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
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- Ishii Kunio
- Department of Molecular Pharmacology, School of Pharmaceurical Sciences, Kitasato University
Bibliographic Information
- Other Title
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- Agonist-Induced Receptor Internalization in Chinese Hamster Ovary Cells Stably Co-expressing β1- and β2-Adrenergic Receptors
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Abstract
β1- and β2-Adrenergic receptors (β1-AR and β2-AR) are co-expressed in numerous tissues, for example, heart and bladder. They play a very important role in the responses of a variety of organs to sympathetic nerve stimulation. Recent studies suggest that many G protein-coupled receptors, such as β1-AR, β2-AR, μ opioid receptor and δ opioid receptor, can form homo- and heterooligomers. Previous studies demonstrated that the β1-AR and β2-AR formed dimers in living HEK 293 cells. The aim of the present study is to investigate whether such heterooligomerization affect the agonist-induced receptor internalization in the CHO-K1 cells stably co-expressing β1-AR and β2-AR. Using co-immunoprecipitation, we confirmed that β1-AR and β2-AR formed heterooligomers in the CHO-K1 cells. In cells co-expressing β1-AR and β2-AR, 30% of β1-AR was internalized by isoproterenol, whereas only 20% of β1-AR was internalized in cells expressing the β1-AR alone. Heterooligomerization did not affect the ratio of internalized β2-AR. Salmeterol, a specific β2-AR agonist, broke β1-AR/β2-AR heterooligomers, and induced β2-AR-specific internalization in cells co-expressing β1-AR and β2-AR. The present study demonstrated that heterooligomerization between β1-AR and β2-AR accelerates the isoproterenol-promoted internalization of the β1-AR, and that salmeterol induces β2-AR-specific internalization in Chinese hamster ovary (CHO) cells stably co-expressing β1-AR and β2-AR.
Journal
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- Biological and Pharmaceutical Bulletin
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Biological and Pharmaceutical Bulletin 36 (1), 114-119, 2013
The Pharmaceutical Society of Japan
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Details 詳細情報について
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- CRID
- 1390282679610012672
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- NII Article ID
- 130003361347
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- NII Book ID
- AA10885497
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- COI
- 1:STN:280:DC%2BC3s3otFahtA%3D%3D
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- ISSN
- 13475215
- 09186158
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- NDL BIB ID
- 024173580
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- PubMed
- 23302644
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed