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Inhibition of AT1 receptor internalization by concanavalin A blocks angiotensin II-induced ERK activation in vascular smooth muscle cells. Involvement of epidermal growth factor receptor proteolysis but not AT1 receptor internalization

Recent studies of beta(2)-adrenergic receptor suggest that agonist-promoted receptor internalization may play an important role in extracellular signal-regulated kinase (ERK) activation by G protein-coupled receptors. In the present study, we explored the effects of angiotensin II (Ang II) type-1 re...

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Published in:The Journal of biological chemistry 2000-05, Vol.275 (18), p.13420-13426
Main Authors: Tang, H, Nishishita, T, Fitzgerald, T, Landon, E J, Inagami, T
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container_issue 18
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container_title The Journal of biological chemistry
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creator Tang, H
Nishishita, T
Fitzgerald, T
Landon, E J
Inagami, T
description Recent studies of beta(2)-adrenergic receptor suggest that agonist-promoted receptor internalization may play an important role in extracellular signal-regulated kinase (ERK) activation by G protein-coupled receptors. In the present study, we explored the effects of angiotensin II (Ang II) type-1 receptor (AT(1)) internalization on Ang II-induced activation of ERK using the receptor internalization blocker concanavalin A (ConA) and the carboxyl terminus-truncated receptor mutants with impaired internalization. ConA inhibited AT(1) receptor internalization without affecting ligand binding to the receptor, Ang II-induced generation of second messengers, and activation of tyrosine kinases Src and Pyk2 in vascular smooth muscle cells (VSMC). ConA blocked ERK activation evoked by Ang II and the calcium ionophore A23187. Impairment of AT(1) receptor internalization by truncating the receptor carboxyl terminus did not affect Ang II-induced ERK activation. ConA induced proteolytic cleavage of the epidermal growth factor (EGF) receptor at carboxyl terminus and abolished Ang II-induced transactivation of the EGF receptor, which is critical for ERK activation by Ang II in VSMC. ConA also induced proteolysis of erbB-2 but not platelet-derived growth factor receptor. Thus, ConA blocks Ang II-induced ERK activation in VSMC through a distinct mechanism, the ConA-mediated proteolysis of the EGF receptor.
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subjects Angiotensin II - metabolism
Angiotensin II - pharmacology
Angiotensin Receptor Antagonists
Animals
Cells, Cultured
Concanavalin A - pharmacology
Enzyme Activation
ErbB Receptors - metabolism
Mitogen-Activated Protein Kinases - metabolism
Muscle, Smooth, Vascular - metabolism
Rats
Rats, Sprague-Dawley
Receptors, Angiotensin - metabolism
Signal Transduction - drug effects
title Inhibition of AT1 receptor internalization by concanavalin A blocks angiotensin II-induced ERK activation in vascular smooth muscle cells. Involvement of epidermal growth factor receptor proteolysis but not AT1 receptor internalization
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