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created:
  W3 CDTF: Tue Aug 24 14:34:45 BST 2010
occurs in: BTO:0001009
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initial assignment: BIOMD0000000264#
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curated: true
creator:
  ORG:
    orgname: EMBL-EBI
  n:
    given: Lukas
    family: Endler
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has version: GO:0070849
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name: Fujita2010_Akt_Signalling_EGFRinhib
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notes: Akt pathway model with EGFR inhibitor made by Kazuhiro A. Fujita. This is the Akt pathway model with an EGFR inhibitor described in: Decoupling of receptor and downstream signals in the Akt pathway by its low-pass filter characteristics. Fujita KA, Toyoshima Y, Uda S, Ozaki Y, Kubota H, and Kuroda S. Sci Signal. 2010 Jul 27;3(132):ra56. PMID: 20664065 ; DOI: 10.1126/scisignal.2000810 Abstract: In cellular signal transduction, the information in an external stimulus is encoded in temporal patterns in the activities of signaling molecules; for example, pulses of a stimulus may produce an increasing response or may produce pulsatile responses in the signaling molecules. Here, we show how the Akt pathway, which is involved in cell growth, specifically transmits temporal information contained in upstream signals to downstream effectors. We modeled the epidermal growth factor (EGF)–dependent Akt pathway in PC12 cells on the basis of experimental results. We obtained counterintuitive results indicating that the sizes of the peak amplitudes of receptor and downstream effector phosphorylation were decoupled; weak, sustained EGF receptor (EGFR) phosphorylation, rather than strong, transient phosphorylation, strongly induced phosphorylation of the ribosomal protein S6, a molecule downstream of Akt. Using frequency response analysis, we found that a three-component Akt pathway exhibited the property of a low-pass filter and that this property could explain decoupling of the peak amplitudes of receptor phosphorylation and that of downstream effectors. Furthermore, we found that lapatinib, an EGFR inhibitor used as an anticancer drug, converted strong, transient Akt phosphorylation into weak, sustained Akt phosphorylation, and, because of the low-pass filter characteristics of the Akt pathway, this led to stronger S6 phosphorylation than occurred in the absence of the inhibitor. Thus, an EGFR inhibitor can potentially act as a downstream activator of some effectors. The different…
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occurs in: http://identifiers.org/taxonomy/10116
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has version: REACT 9417.3
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length unit: length
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is described by: http://identifiers.org/pubmed/20664065
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name: EGF_EGFR_i
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282956
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is version of: GO:0032148
name: Akt_phosphorylation

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name: S6_phosphorylation
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283016
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282953
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282969
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624303
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624291
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282968
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282954
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282959
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reversible: true

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624003
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623991
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282944
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282999
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282965
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is version of: GO:0004672
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name: EGFR_phosphorylation

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name: EGF_conc_ramp

283004
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value: 49886.2
name: pS6_scaleFactor

282964
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is version of: GO:0010467
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name: EGFR_synthesis

624159
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624147
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283014
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name: inhibitor_binding_kf

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name: EGF_binding_kb

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name: EGFR_degradation

624219
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name: pEGFR_degradation

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283011
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value: 1.06386E-4
name: EGFR_turnover

282971
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624388
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283003
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is version of: GO:0004721
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reversible: false
name: pS6_dephospho

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value: 0.00113102
name: k1

624123
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624111
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283002
type: Parameter
constant: true
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value: 1.81735E-4
name: pEGFR_scaleFactor

W3 CDTF: Wed Sep 21 09:36:08 BST 2011

ORG:
  orgname: University of Tokyo
n:
  given: Kazuhiro
  family: Fujita