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J. Biol. Chem., Vol. 275, Issue 34, 26545-26550, August 25, 2000
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From the Gastroenterology Division, Beth Israel Deaconess Medical
Center, Harvard Medical School, Boston, Massachusetts 02215
Ligand-induced activation of G protein-coupled
receptors is emerging as an important pathway leading to the
activation of certain receptors with intrinsic tyrosine kinase
activity, such as the epidermal growth factor receptor (EGFR).
Substance P (SP) exerts many effects via activation of its G
protein-coupled receptor (neurokinin-1, NK-1). SP participates
in acute inflammation and activates key proteins involved in mitogenic
pathways, such mitogen-activated protein kinases (MAPKs), stimulating
DNA synthesis. We tested the hypothesis that SP-induced MAPK activation
and DNA synthesis require activation of the EGFR. In U-373 MG cells,
which express functional NK-1, SP induced tyrosine phosphorylation of
several proteins including EGFR. SP induced formation of an activated EGFR complex containing the adapter proteins SHC and Grb2, but not c-Src. SP activated the MAPK pathway as shown by increased Erk2
kinase activity. SP induced Erk2 activation, and DNA synthesis was
inhibited in cells transfected with a dominant negative EGFR plasmid
lacking kinase activity, as well as in cells treated with a specific
EGFR inhibitor. In addition, pertussis toxin, an inhibitor of
G
Epidermal Growth Factor Receptor Transactivation Mediates
Substance P-induced Mitogenic Responses in U-373 MG Cells*
,
protein subunits, prevented SP-induced EGFR
transactivation and subsequent DNA synthesis. Our results implicate
EGFR as an essential regulator in SP/NK-1-induced activation of the
MAPK pathway and cell proliferation in U-373 MG cells, and these events are mediated by a pertussis toxin-sensitive G
protein. We suggest that this mechanism by which SP controls cell proliferation is an
important pathway in tissue restoration and healing.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Beth Israel Deaconess
Medical Center, Division of Gastroenterology, Dana 501, 330 Brookline
Ave., Boston, MA 02215. Tel.: 617-667-1259; Fax: 617-667-2767; E-mail:
icastagl@ux1.unipd.it.
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