Molecular and Cellular Biology, January 2001, p. 595-602, Vol. 21, No. 2
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.2.595-602.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Department of Biological Sciences, Hunter College of The City University of New York, New York, New York 10021
Received 22 June 2000/Returned for modification 27 July 2000/Accepted 12 October 2000
In response to epidermal growth factor (EGF), the EGF receptor is
endocytosed and degraded. A substantial lag period exists between
endocytosis and degradation, suggesting that endocytosis is more than a
simple negative feedback. Phospholipase D (PLD), which has been
implicated in vesicle formation in the Golgi, is activated in response
to EGF and other growth factors. We report here that EGF receptor
endocytosis is dependent upon PLD and the PLD1 regulators, protein
kinase C
and RalA. EGF-induced receptor degradation is accelerated
by overexpression of either wild-type PLD1 or PLD2 and retarded by
overexpression of catalytically inactive mutants of either PLD1 or
PLD2. EGF-induced activation of mitogen-activated protein kinase, which
is dependent upon receptor endocytosis, is also dependent upon PLD.
These data suggest a role for PLD in signaling that facilitates
receptor endocytosis.
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