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Monitoring Hippo Signaling Pathway Activity Using a Luciferase-based Large Tumor Suppressor LATS Biosensor
Published on: September 13, 2018
[Downregulation of Herg1 suppresses osteosarcoma proliferation and invasion by targeting Hippo signaling pathway]
1Orthopaedics Center of PLA, the 909th Hospital of PLA, the Affiliated Southeast Hospital of Xiamen University, Zhangzhou 363000, China.
Abstract:
Objective: To detect the effect and regulatory mechanism of human ether à go-go related gene 1 (Herg 1) knockdown on the proliferation and invasion of osteosarcoma (OS). Methods: We constructed a recombinant adenovirus vector (Ad5-Herg1-shRNA) expressing short hair RNA (shRNA) against Herg1 and tested the knockdown efficiency. Then, the effects of Herg 1 knockdown on the proliferation, growth and invasion of osteosarcoma were measured by using cell counting kit-8 (CCK-8), wound healing assay, Transwell assay and xenograft model of nude mice, respectively. Tandem affinity purification, mass spectrometry and dual luciferase reporter assay were used to find out the molecules interacted with Herg1. Western blot was used to detect the expressions of large tumor suppressor gene (LATS1), p-LATS1, Yes-associated protein (YAP) and p-YAP in cells after infection of Ad5-Herg1-shRNA. Results: Compared to Ad5-control-shRNA, Ad5-Herg1-shRNA dramatically inhibited the expression of Herg1 in OS cells. The result of CCK8 array demonstrated that 143B cell vitalities of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were (65.47±3.90)% and (79.90±1.52)%, significantly lower than (100.00±6.14)% of Ad5-control-shRNA group. Meanwhile, U2OS cell vitality of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were (69.69±1.36)% and (76.72±2.75)%, significantly lower than (100.00±3.01)% of Ad5-control-shRNA group (all P<0.001). The results of wound healing array showed that 143B cell migration rates of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were (33.03±2.88)% and (36.47±4.16)%, significantly lower than (97.78±2.28)% of Ad5-control-shRNA group. Meanwhile, U2OS cell migration rates of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were (68.07±0.90)% and (73.97±1.25)%, significantly lower than (96.50±1.12)% of Ad5-control-shRNA group (all P<0.001). The results of Transwell showed that 143B cell invasion numbers of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were 36.50±12.15 and 44.83±7.62, significantly lower than 195.33±19.68 of Ad5-control-shRNA group. Meanwhile, U2OS cell migration rates of Ad5-Herg1-shRNA1 and Ad5-Herg1-shRNA2 group were 21.83±7.99 and 22.85±7.08, significantly lower than 83.33±12.36 of Ad5-control-shRNA group (all P<0.001). The results of xenograft model of OS showed that the tumor volume and weight of Ad5-Herg1-shRNA group were significantly smaller than of Ad5-control-shRNA group after 14 days and 5 weeks of inoculation, respectively (P<0.001). Moreover, knockdown of Herg1 inhibited the metastasis of OS cells. In mechanism, Herg1 protein interacted with NF2 protein. Knockdown of Herg1 significantly suppressed the expression levels of LATS1 and YAP protein, and promoted the phosphorylation of LATS1 and YAP in OS cells (all P<0.001). Conclusion: Our findings suggest that Herg1 participates in the proliferation and motility of OS cells and may serve as a potential therapeutic target for osteosarcoma patients.
Insights
Knocking down human ether à go-go related gene 1 (Herg 1) significantly inhibited osteosarcoma cell proliferation and invasion. Herg 1 knockdown also suppressed tumor growth and metastasis in vivo, suggesting it as a potential therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Osteosarcoma (OS) is a primary bone malignancy with limited treatment options.
- The role of human ether à go-go related gene 1 (Herg 1) in OS progression is not fully understood.
Purpose of the Study:
- To investigate the effect of Herg 1 knockdown on osteosarcoma cell proliferation and invasion.
- To elucidate the regulatory mechanism of Herg 1 in osteosarcoma.
Main Methods:
- Constructed recombinant adenovirus vector (Ad5-Herg1-shRNA) for Herg 1 knockdown.
- Assessed proliferation, migration, and invasion using CCK-8, wound healing, and Transwell assays.
- Utilized xenograft models, tandem affinity purification, mass spectrometry, and Western blot analysis.
Main Results:
- Herg 1 knockdown significantly inhibited OS cell proliferation, migration, and invasion in vitro.
- Herg 1 knockdown suppressed tumor growth and metastasis in a nude mouse xenograft model.
- Herg 1 interacted with NF2 and regulated the LATS1/YAP signaling pathway.
Conclusions:
- Herg 1 plays a crucial role in osteosarcoma cell proliferation and motility.
- Herg 1 represents a potential therapeutic target for osteosarcoma.
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