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Updated: Jul 3, 2025

Intratibial Osteosarcoma Cell Injection to Generate Orthotopic Osteosarcoma and Lung Metastasis Mouse Models
Published on: October 28, 2021
Silencing FUT4 Inhibits the Progression of Osteosarcoma through Activation of FOXO1
Yang Yang1, Xiaodi Yan2, YueYuan Chen3
1Department of Trauma Center, Affiliated Hospital of Nantong University, Nantong City, Jiangsu Province 226001, China.
Background:
It has been reported that inhibition of Fucosyltransferase4 (FUT4) to activate Forkhead box O1 (FOXO1) can lead to apoptosis of cancer cells, however, the mechanism in osteosarcoma is still unclear.
Objective:
To explore the biological significance of the connection between FUT4 and FOXO1 in osteosarcoma growth.
Methods:
In vitro tests were conducted using the human osteoblast cell line and the osteosarcoma cell lines. QRT-PCR assay as well as western blot assay were used to ascertain the relative expression levels of FUT4 and FOXO1 in the cells. By using the CCK-8 assay, colony assay, EDU assay, wound healing assay and Transwell assay, osteosarcoma cells' ability to proliferate, migrate and invade were examined in relation to si- FUT4. TUNEL test was used to evaluate Si-impact FUT4's on KHOS and U2OS apoptosis in osteosarcoma cells. Western blot assay was used to identify the expression of proliferative, migrating and apoptosis-related protein markers in osteosarcoma cells KHOS and U2OS and the expression of important proteins in the Wnt/ β-catenin signaling pathway.
Results:
In comparison with osteoblasts, osteosarcoma cells expressed more FUT4. The osteosarcoma cells' capacities to proliferate, invade, and migrate were markedly inhibited by the inhibition of FUT4 expression, which also increased osteosarcoma cell apoptosis. The Wnt/β-catenin signaling pathway was blocked by upregulating FOXO1 expression, which was in turn inhibited by inhibiting FUT4 expression.
Conclusion:
Osteosarcoma cells express more FUT4. The Wnt/β-catenin signaling pathway has a significant effect on osteosarcoma cell death, and inhibition of FUT4 expression may target FOXO1 activation to decrease osteosarcoma cells' ability to proliferate, invade, and migrate.
Insights
Inhibition of Fucosyltransferase4 (FUT4) activates Forkhead box O1 (FOXO1), reducing osteosarcoma cell proliferation, invasion, and migration. This suggests FUT4 inhibition is a potential therapeutic strategy for osteosarcoma by targeting the Wnt/β-catenin pathway.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Fucosyltransferase4 (FUT4) inhibition activates Forkhead box O1 (FOXO1), inducing cancer cell apoptosis.
- The precise mechanism of FUT4 and FOXO1 in osteosarcoma remains unclear.
Purpose of the Study:
- To investigate the biological role of the FUT4-FOXO1 interaction in osteosarcoma progression.
- To determine if FUT4 inhibition impacts osteosarcoma cell proliferation, migration, invasion, and apoptosis.
Main Methods:
- Utilized in vitro assays with human osteoblast and osteosarcoma cell lines.
- Assessed FUT4 and FOXO1 expression via qRT-PCR and Western blot.
- Evaluated osteosarcoma cell proliferation, migration, invasion, and apoptosis using CCK-8, colony, EDU, wound healing, Transwell, and TUNEL assays.
- Investigated the Wnt/β-catenin signaling pathway and related protein markers.
Main Results:
- Osteosarcoma cells exhibited higher FUT4 expression compared to osteoblasts.
- FUT4 inhibition significantly suppressed osteosarcoma cell proliferation, invasion, and migration.
- Inhibition of FUT4 led to increased osteosarcoma cell apoptosis.
- FUT4 inhibition blocked the Wnt/β-catenin pathway by upregulating FOXO1 expression.
Conclusions:
- Osteosarcoma cells overexpress FUT4.
- FUT4 inhibition targets FOXO1 activation, impacting the Wnt/β-catenin pathway and reducing osteosarcoma cell viability.
- Targeting FUT4 offers a potential therapeutic strategy for osteosarcoma treatment.
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