Abstract | AIM: METHODS: The in vitro biological function analyses of FMNL3 were performed by gain- and loss-of function approaches. Changes in the F-actin cytoskeleton were detected by the technologies of phalloidin- TRITC labeling and confocal microscopy. The signaling pathway mediated by FMNL3 was explored by western blot, gelatin zymograph assay, co-immunoprecipitation (co-IP), immunofluorescence co-localization, and glutathione S-transferase (GST) pull-down assay. RESULTS: The in vitro experimental results showed that FMNL3 significantly promoted the proliferation, invasion, and migration of CRC cells (P < 0.05 and P < 0.01). Moreover, FMNL3 regulated the remodeling of actin-based protrusions such as filopodia and lamellipodia in a RhoC-dependent manner. The western blot and gelatin zymograph assay results indicated that FMNL3 was involved in the RhoC/ focal adhesion kinase (FAK) pathway and acted as an effector of RhoC to activate the downstream signaling of p-FAK as well as p-MAPK and p-AKT. This resulted in the increased expression of matrix metalloproteinase 2 (MMP2), matrix metalloproteinase 9 (MMP9) and vascular endothelial growth factor ( VEGF), and the subsequent promotion of CRC cell invasion. The results of TAE226, U0126 or Ly294002 treatment confirmed an essential role of FMNL3 in activation of the RhoC/FAK pathway and the subsequent promotion of CRC invasion. Co-IP, co-localization and GST pull-down assays showed the direct interaction of FMNL3 with RhoC in vivo and in vitro. CONCLUSION: FMNL3 regulates the RhoC/FAK signaling pathway and RhoC-dependent remodeling of actin-based protrusions to promote CRC invasion.
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Authors | Yuan-Feng Zeng, Yi-Sheng Xiao, Yong Liu, Xiao-Jiang Luo, Li-Dan Wen, Qian Liu, Min Chen |
Journal | World journal of gastroenterology
(World J Gastroenterol)
Vol. 24
Issue 34
Pg. 3884-3897
(Sep 14 2018)
ISSN: 2219-2840 [Electronic] United States |
PMID | 30228782
(Publication Type: Journal Article)
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Chemical References |
- Actins
- Enzyme Inhibitors
- FMNL3 protein, human
- Formins
- Proteins
- RNA, Small Interfering
- Focal Adhesion Kinase 2
- PTK2B protein, human
- RHOC protein, human
- rhoC GTP-Binding Protein
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Topics |
- Actins
(metabolism)
- Cell Adhesion
(drug effects)
- Cell Line, Tumor
- Cell Movement
(drug effects)
- Colorectal Neoplasms
(pathology)
- Enzyme Inhibitors
(pharmacology)
- Focal Adhesion Kinase 2
(genetics, metabolism)
- Formins
- HEK293 Cells
- Humans
- Neoplasm Invasiveness
(pathology)
- Proteins
(antagonists & inhibitors, genetics, metabolism)
- RNA, Small Interfering
(metabolism)
- Signal Transduction
(drug effects)
- rhoC GTP-Binding Protein
(metabolism)
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