PUBLICATION
The Amot/Patj/Syx signaling complex spatially controls RhoA GTPase activity in migrating endothelial cells
- Authors
- Ernkvist, M., Luna Persson, N., Audebert, S., Lecine, P., Sinha, I., Liu, M., Schlueter, M., Horowitz, A., Aase, K., Weide, T., Borg, J.P., Majumdar, A., and Holmgren, L.
- ID
- ZDB-PUB-081001-19
- Date
- 2009
- Source
- Blood 113(1): 244-253 (Journal)
- Registered Authors
- Majumdar, Arindam
- Keywords
- none
- MeSH Terms
-
- Animals
- Animals, Genetically Modified
- Aorta/cytology
- Capillaries/cytology
- Capillaries/embryology*
- Capillaries/metabolism
- Carrier Proteins/metabolism
- Cell Line, Transformed
- Cell Movement/physiology
- Endothelial Cells/cytology
- Endothelial Cells/physiology*
- Guanine Nucleotide Exchange Factors/genetics
- Guanine Nucleotide Exchange Factors/metabolism*
- Humans
- Intercellular Signaling Peptides and Proteins/genetics
- Intercellular Signaling Peptides and Proteins/metabolism*
- Kidney/cytology
- Membrane Proteins/genetics
- Membrane Proteins/metabolism*
- Mice
- Neovascularization, Physiologic/physiology
- PDZ Domains/physiology
- Rho Guanine Nucleotide Exchange Factors
- Tight Junction Proteins
- Zebrafish
- Zebrafish Proteins/genetics
- Zebrafish Proteins/metabolism
- rhoA GTP-Binding Protein/metabolism*
- PubMed
- 18824598 Full text @ Blood
Citation
Ernkvist, M., Luna Persson, N., Audebert, S., Lecine, P., Sinha, I., Liu, M., Schlueter, M., Horowitz, A., Aase, K., Weide, T., Borg, J.P., Majumdar, A., and Holmgren, L. (2009) The Amot/Patj/Syx signaling complex spatially controls RhoA GTPase activity in migrating endothelial cells. Blood. 113(1):244-253.
Abstract
Controlled regulation of Rho GTPase activity is an essential component mediating growth factor stimulated migration. We have previously shown that angiomotin (Amot), a membrane associated scaffold protein, plays a critical role during vascular patterning and endothelial migration during embryogenesis. However, the signaling pathways by which Amot controls directional migration are not known. Here we have employed peptide pull-down and yeast two-hybrid (Y2H) screening to identify proteins that interact with the C-terminal PDZ-binding motifs of Amot and its related proteins AmotL1 and 2. We report that Amot and its related proteins bind to the RhoA GTPase Exchange Factor (RhoGEF) protein Syx. We show that Amot forms a ternary complex together with Patj (or its paralogue Mupp1) and Syx. By using FRET analysis we provide evidence that Amot controls targeting of RhoA activity to lamellipodia in vitro. We also report that, similar to Amot, morpholino knock down of Syx in zebrafish results in inhibition of migration of inter-segmental arteries. Taken together, our results indicate that the directional migration of capillaries in the embryo is governed by the Amot:Patj/Mupp1:Syx signaling that control local GTPase activity.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping