| 2000 |
NADRIN (ARHGAP17) contains a GAP domain that activates RhoA, Rac1, and Cdc42 GTPases in vitro. Expression in NIH3T3 cells reduced actin stress fibers and ruffled membranes. In PC12 cells, NADRIN co-localized with synaptotagmin at neurite termini and with cortical actin filaments. Expression of NADRIN or its coiled-coil+GAP domain mutant enhanced Ca2+-dependent exocytosis, while a GAP-domain-lacking mutant inhibited exocytosis, establishing that GAP activity is required for its role in regulated exocytosis. |
In vitro GAP assay, NIH3T3 cell morphology, PC12 cell co-localization and exocytosis assay with domain-deletion mutants |
The Journal of biological chemistry |
High |
10967100
|
| 2002 |
Three novel splice variants of NADRIN (ARHGAP17) were identified (nadrin-102, -104, -116, -126). Nadrin-116 inhibited NGF-dependent neurite outgrowth in a GAP-activity-dependent manner, while other variants had no effect. The 66-kDa C-terminal fragment of nadrin-102 and nadrin-116 localized to the nucleus, and NGF-induced differentiation accelerated this nuclear translocation. |
Splice variant identification, PC12 cell neurite outgrowth assay with GAP-mutants, subcellular fractionation and localization |
Journal of neurochemistry |
Medium |
12358749
|
| 2004 |
The BAR domain of RICH-1 (ARHGAP17) binds membrane lipids and deforms spherical liposomes into striated tubes, consistent with oligomerization via a coiled-coil region within the BAR domain. RICH-1 forms oligomers in the presence of the chemical cross-linker BS3. |
Liposome tubulation assay, lipid-binding assay, chemical crosslinking (BS3) |
Biochemical and biophysical research communications |
Medium |
15240152
|
| 2006 |
RICH1 (ARHGAP17) binds the scaffolding protein angiomotin (Amot), which targets RICH1 to a tight junction complex containing Pals1, Patj, and Par-3. Regulation of Cdc42 by RICH1 is necessary for maintenance of tight junctions in MDCK epithelial cells. The coiled-coil domain of Amot, required for Rich1 binding, is also necessary for Amot localization to apical membranes and for Amot to relocalize Pals1 and Par-3 to internal puncta. |
Proteomic screen (functional and protein interaction), Co-IP, MDCK cell tight junction assays, domain-deletion experiments |
Cell |
High |
16678097
|
| 2012 |
Nadrin (ARHGAP17) is present in platelets where it co-localizes with actin-rich regions and Rho GTPases. Different Nadrin isoforms selectively regulate RhoA, Cdc42, or Rac1. The BAR domain controls Nadrin-GAP activity and directs the GAP to the plasma membrane. Nadrin overexpression strongly reduced platelet cell adhesion on fibrinogen and controls RhoA-mediated stress fiber and focal adhesion formation. |
Isoform-specific overexpression, Rho GTPase activity assays, co-localization, spreading/adhesion assay on fibrinogen, BAR domain deletion |
Cellular signalling |
Medium |
22975681
|
| 2013 |
NADRIN (ARHGAP17) expression increased in stellate astrocytes. Induced expression accelerated morphological differentiation of cultured astrocytes into stellate cells in a GAP-activity-dependent manner. NADRIN formed a dimer via amino- and carboxy-terminal domain interaction, which was disrupted by inductive signals (dibutyryl-cAMP, EGF). Upon inductive signals, NADRIN formed a complex with ERM proteins via ERM-binding phosphoprotein 50 (EBP50) through its C-terminal PDZ-binding motif, where it inactivates RhoA. |
Immunoprecipitation (co-IP), GAP-activity mutant rescue, astrocyte stellation assay, domain-deletion analysis |
Journal of biochemistry |
Medium |
23355722
|
| 2014 |
Nadrin (ARHGAP17) becomes tyrosine-phosphorylated upon platelet activation by Src family kinases (Src, Lyn, Fyn). Phosphorylation leads to isoform- and target-specific regulation: Src-phosphorylation of Nadrin5 mediates Cdc42 inactivation, while Src-phosphorylation of Nadrin2 leads to RhoA and Rac1 activation. |
Platelet activation assay, kinase co-IP, phosphorylation assays with Src-family inhibitors, isoform-specific Rho GTPase activity assays |
Cellular signalling |
Medium |
24703939
|
| 2015 |
PKA and PKG phosphorylate ARHGAP17 at serine 702 in platelets, which is mapped using Phos-tag gels. ARHGAP17 binds CIP4 in platelets and Ser-702 phosphorylation interferes with CIP4 binding; reduced CIP4 binding results in enhanced inhibition of cell migration by ARHGAP17. PKA/PKG activation reduces Rac1-GTP levels, and ARHGAP17 is identified as a Rac1-specific GAP mediating this effect. |
Phos-tag gel phosphorylation mapping, Co-IP/pulldown of ARHGAP17-CIP4 complex, Rac1-GTP assay (pull-down), cell migration assay |
The Journal of biological chemistry |
High |
26507661
|
| 2015 |
Rich1 (ARHGAP17) overexpression in hepatocyte HL7702 epithelial cells causes S-phase arrest, proliferation inhibition, and adhesion decline with decreased F-actin. Rich1 stimulates GTP hydrolysis on both CDC42 and RAC1, attenuating their activity and the phosphorylation of PAK1 and ERK1/2. GAP-domain-deleted Rich1 or Rich1 silencing abolished all these effects, establishing a CDC42/RAC1-PAK1-ERK1/2 signaling axis. |
Overexpression/knockdown, Rho GTPase activity assay (GTP hydrolysis), phosphorylation (Western blot), cell cycle analysis, adhesion assay |
Cellular signalling |
Medium |
26004135
|
| 2016 |
Arhgap17-deficient mice show increased paracellular permeability and aberrant localization of the apical junction complex in intestinal luminal epithelium, establishing a role for Arhgap17 in regulating transcellular transport and maintaining intestinal barrier integrity in vivo. |
Knockout mouse model, paracellular permeability assay, immunofluorescence localization of apical junction complex |
Scientific reports |
High |
27229483
|
| 2018 |
VEGF long isoform acting through NRP1 controls filopodia formation and cell migration of breast cancer cells by modulating Cdc42 activity via ARHGAP17. Genome-wide expression profiling identified ARHGAP17 as a target gene downstream of the VEGF/NRP1 signal, and VEGF knockout or soluble NRP1 overexpression impaired cell migration concordantly with altered ARHGAP17 expression and Cdc42 activity. |
VEGF knockout, soluble NRP1 overexpression, genome-wide expression profiling, Cdc42 activity assay, filopodia imaging |
International journal of cancer |
Medium |
29971782
|
| 2018 |
ARHGAP17 overexpression in colon cancer cells inhibits cell growth and invasion and restricts lung metastasis in vivo. Mechanistically, ARHGAP17 increases phosphorylation of GSK3β and decreases β-catenin nuclear localization and transcriptional activity. WIF-1-mediated inhibition of Wnt signaling attenuated the proliferation/invasion promotion caused by ARHGAP17 knockdown, placing ARHGAP17 upstream of Wnt/β-catenin. |
Overexpression/knockdown, in vivo metastasis model, Western blot for β-catenin/GSK3β phosphorylation, GSEA, Wnt inhibitor epistasis |
Cellular physiology and biochemistry |
Medium |
29730655
|
| 2020 |
ARHGAP17 overexpression abolished pathological cyclic strain-induced apoptosis in human periodontal ligament fibroblasts by inactivating Rac1/Cdc42. Rac1 inhibitors (NSC23766, EHT 1864) attenuated ARHGAP17 knockdown-mediated apoptosis, confirming epistatic placement of ARHGAP17 upstream of Rac1/Cdc42 in the apoptosis pathway. |
Cyclic strain model, overexpression/knockdown, Rac1/Cdc42 activity assay, pharmacological inhibition epistasis, apoptosis assay |
Clinical and experimental pharmacology & physiology |
Medium |
32391922
|
| 2022 |
ARHGAP17 is a Cdc42-specific RhoGAP that localizes to the invadopodia ring during assembly, restricting Cdc42 activity to the invadopodia core. During disassembly, ARHGAP17 translocates from the ring to the core in a process mediated by its interaction with the Cdc42 effector CIP4. Once at the core, ARHGAP17 inactivates Cdc42 to promote invadopodia disassembly, defining a spatiotemporal regulatory mechanism for Cdc42 at invadopodia. |
Live imaging, FRAP/localization at invadopodia, Cdc42 activity biosensor (FRET-based), knockdown, Co-IP with CIP4 |
The Journal of cell biology |
High |
36571786
|
| 2022 |
RICH1 (ARHGAP17) activates the Hippo kinase cascade in breast cancer cells by competing with Merlin for binding to Amot-p80. This competition is mediated by the BAR domain of RICH1; deletion of the BAR domain abolished RICH1's ability to displace Amot-p80 from Merlin. Loss of RICH1 promoted stemness and disrupted epithelial architecture. |
Co-IP (RICH1-Amot-p80-Merlin complex), BAR domain deletion mutant, Hippo pathway kinase activity (MST1/2, LATS), stemness assays |
Cell death & disease |
Medium |
35064101
|
| 2022 |
ARHGAP17 knockdown in colon cancer cells led to elevated active Rac1 levels, while ARHGAP17 overexpression reduced active Rac1 and sensitized 5-FU-resistant cells to apoptosis. Rac1 inhibitor abolished the anti-apoptotic effect of ARHGAP17 knockdown, and Rac1 overexpression reversed the pro-apoptotic effect of ARHGAP17 overexpression, placing ARHGAP17 upstream of Rac1 in the apoptosis pathway. |
Rac1-GTP pull-down assay, overexpression/knockdown, pharmacological Rac1 inhibition epistasis, apoptosis (cleaved caspase-3, PARP), in vivo xenograft |
Neoplasma |
Medium |
35293764
|
| 2023 |
Wdr4, a substrate adaptor of the CUL4 E3 ligase complex, induces ubiquitination and degradation of Arhgap17 in cerebellar granule neuron progenitors (GNPs), thereby activating Rac1 and facilitating cell cycle progression. Loss of Wdr4 in GNPs increased Arhgap17 levels, reduced Rac1 activity, and caused proliferation defects and cerebellar developmental abnormalities. |
Genetic mouse KO, ubiquitination assay, Rac1-GTP pull-down, cell cycle analysis, cerebellar immunohistology |
Cell death & disease |
High |
36681682
|
| 2025 |
RICH1 (ARHGAP17) facilitates ubiquitination-mediated degradation of RhoA by binding TRIM21 E3 ligase and enhancing TRIM21-RhoA interaction in breast cancer cells. This leads to decreased STAT3 phosphorylation, increased IFN-γ production/secretion, and promotion of M1-like macrophage polarization. |
Co-IP (RICH1-TRIM21-RhoA complex), ubiquitination assay, STAT3 phosphorylation Western blot, cytokine secretion assay, macrophage polarization assay |
NPJ precision oncology |
Medium |
41436617
|
| 2026 |
NME1, whose histidine phosphorylation is required for its activity, modulates CDC42 activity via ARHGAP17, thereby influencing cytoskeletal organization and Hippo pathway activation. Loss of NME1 reduced YAP phosphorylation and promoted YAP nuclear localization, consistent with suppression of Hippo signaling through the NME1-ARHGAP17-CDC42-cytoskeleton axis. Identified using PhastID-based proximity labeling. |
PhastID proximity labeling, CDC42 activity assay, YAP phosphorylation/localization assay, loss-of-function |
Life medicine |
Medium |
41978798
|