Attenuation of ligand-induced activation of angiotensin II type 1 receptor signaling by the type 2 receptor via protein kinase C

Angiotensin II (AII) type 2 receptor (AT2R) negatively regulates type 1 receptor (AT1R) signaling. However, the precise molecular mechanism of AT2R-mediated AT1R inhibition remains poorly understood. Here, we characterized the local and functional interaction of AT2R with AT1R. AT2R colocalized and...

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Published in:Scientific reports 2016-02, Vol.6 (1), p.21613-21613, Article 21613
Main Authors: Inuzuka, Takayuki, Fujioka, Yoichiro, Tsuda, Masumi, Fujioka, Mari, Satoh, Aya O, Horiuchi, Kosui, Nishide, Shinya, Nanbo, Asuka, Tanaka, Shinya, Ohba, Yusuke
Format: Article
Language:English
Subjects:
Angiotensin
Angiotensin II
Cell Membrane - genetics
Cell Membrane - metabolism
Endosomes
Endosomes - genetics
Endosomes - metabolism
Fluorescence Resonance Energy Transfer
HeLa Cells
Humans
Internalization
Kinases
Ligands
Phosphorylation
Protein kinase C
Protein Kinase C - genetics
Protein Kinase C - metabolism
Receptor, Angiotensin, Type 1 - genetics
Receptor, Angiotensin, Type 1 - metabolism
Receptor, Angiotensin, Type 2 - genetics
Receptor, Angiotensin, Type 2 - metabolism
Signal Transduction - physiology
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Summary:Angiotensin II (AII) type 2 receptor (AT2R) negatively regulates type 1 receptor (AT1R) signaling. However, the precise molecular mechanism of AT2R-mediated AT1R inhibition remains poorly understood. Here, we characterized the local and functional interaction of AT2R with AT1R. AT2R colocalized and formed a complex with AT1R at the plasma membrane, even in the absence of AII. Upon AII stimulation, the spatial arrangement of the complex was modulated, as confirmed by Förster resonance energy transfer (FRET) analysis, followed by AT2R internalization along with AT1R. AT2R internalization was specifically observed only in the presence of AT1R; AT2R alone could not be internalized. The AT1R-specific inhibitor losartan completely inhibited both the conformational change and the internalization of AT2R with AT1R, whereas the AT2R-specific inhibitor PD123319 partially hindered these phenomena, demonstrating that the activation of both receptors was indispensable for these effects. In addition, treatment with the protein kinase C (PKC) inhibitors inhibited the ligand-dependent accumulation of AT2R but not that of AT1R in the endosomes. A mutation in the putative phosphorylation sites of AT2R also abrogated the co-internalization of ATR2 with AT1R and the inhibitory effect of ATR2 on AT1R. These data suggest that AT2R inhibits ligand-induced AT1R signaling through the PKC-dependent pathway.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep21613