A signalling cascade involving receptor-activated phospholipase A
Animals
Binding Sites
Cell Movement
Epidermal Growth Factor
/ pharmacology
ErbB Receptors
/ metabolism
Inositol Phosphates
/ metabolism
Mice
NIH 3T3 Cells
Phospholipases A2
/ metabolism
Phosphorylation
Protein Binding
Protein Tyrosine Phosphatase, Non-Receptor Type 6
/ chemistry
RAW 264.7 Cells
Signal Transduction
Wound Healing
src Homology Domains
src-Family Kinases
/ metabolism
Actin polymerisation
Cell motility
EGF
Glycerophosphoinositols
Membrane ruffles
Phosphoinositides
SH2 domain
Shp1
Journal
Cell communication and signaling : CCS
ISSN: 1478-811X
Titre abrégé: Cell Commun Signal
Pays: England
ID NLM: 101170464
Informations de publication
Date de publication:
01 03 2019
01 03 2019
Historique:
received:
12
12
2018
accepted:
13
02
2019
entrez:
3
3
2019
pubmed:
3
3
2019
medline:
14
6
2019
Statut:
epublish
Résumé
Shp1, a tyrosine-phosphatase-1 containing the Src-homology 2 (SH2) domain, is involved in inflammatory and immune reactions, where it regulates diverse signalling pathways, usually by limiting cell responses through dephosphorylation of target molecules. Moreover, Shp1 regulates actin dynamics. One Shp1 target is Src, which controls many cellular functions including actin dynamics. Src has been previously shown to be activated by a signalling cascade initiated by the cytosolic-phospholipase A Affinity chromatography, mass spectrometry and co-immunoprecipitation studies were employed to identify the GroPIns4P-interactors; among these Shp1 was selected for further analysis. The specific Shp1 residues interacting with GroPIns4P were revealed by NMR and validated by site-directed mutagenesis and biophysical methods such as circular dichroism, isothermal calorimetry, fluorescence spectroscopy, surface plasmon resonance and computational modelling. Morphological and motility assays were performed in NIH3T3 fibroblasts. We find that Shp1 is the direct cellular target of GroPIns4P. GroPIns4P directly binds to the Shp1-SH2 domain region (with the crucial residues being Ser 118, Arg 138 and Ser 140) and thereby promotes the association between Shp1 and Src, and the dephosphorylation of the Src-inhibitory phosphotyrosine in position 530, resulting in Src activation. As a consequence, fibroblast cells exposed to GroPIns4P show significantly enhanced wound healing capability, indicating that GroPIns4P has a stimulatory role to activate fibroblast migration. GroPIns4P is produced by cPLA This study identifies a so-far undescribed mechanism of Shp1/Src modulation that promotes cell motility and that is dependent on the cPLA
Sections du résumé
BACKGROUND
Shp1, a tyrosine-phosphatase-1 containing the Src-homology 2 (SH2) domain, is involved in inflammatory and immune reactions, where it regulates diverse signalling pathways, usually by limiting cell responses through dephosphorylation of target molecules. Moreover, Shp1 regulates actin dynamics. One Shp1 target is Src, which controls many cellular functions including actin dynamics. Src has been previously shown to be activated by a signalling cascade initiated by the cytosolic-phospholipase A
METHODS
Affinity chromatography, mass spectrometry and co-immunoprecipitation studies were employed to identify the GroPIns4P-interactors; among these Shp1 was selected for further analysis. The specific Shp1 residues interacting with GroPIns4P were revealed by NMR and validated by site-directed mutagenesis and biophysical methods such as circular dichroism, isothermal calorimetry, fluorescence spectroscopy, surface plasmon resonance and computational modelling. Morphological and motility assays were performed in NIH3T3 fibroblasts.
RESULTS
We find that Shp1 is the direct cellular target of GroPIns4P. GroPIns4P directly binds to the Shp1-SH2 domain region (with the crucial residues being Ser 118, Arg 138 and Ser 140) and thereby promotes the association between Shp1 and Src, and the dephosphorylation of the Src-inhibitory phosphotyrosine in position 530, resulting in Src activation. As a consequence, fibroblast cells exposed to GroPIns4P show significantly enhanced wound healing capability, indicating that GroPIns4P has a stimulatory role to activate fibroblast migration. GroPIns4P is produced by cPLA
CONCLUSIONS
This study identifies a so-far undescribed mechanism of Shp1/Src modulation that promotes cell motility and that is dependent on the cPLA
Identifiants
pubmed: 30823936
doi: 10.1186/s12964-019-0329-3
pii: 10.1186/s12964-019-0329-3
pmc: PMC6396489
doi:
Substances chimiques
Inositol Phosphates
0
glycero-3-phosphoinositol 4-phosphate
125638-70-2
Epidermal Growth Factor
62229-50-9
ErbB Receptors
EC 2.7.10.1
src-Family Kinases
EC 2.7.10.2
Phospholipases A2
EC 3.1.1.4
Protein Tyrosine Phosphatase, Non-Receptor Type 6
EC 3.1.3.48
Ptpn6 protein, mouse
EC 3.1.3.48
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
20Subventions
Organisme : Associazione Italiana per la Ricerca sul Cancro
ID : IG10341 and IG18776
Pays : International
Organisme : Associazione Italiana per la Ricerca sul Cancro
ID : 20786
Pays : International
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