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Updated: Jun 4, 2026
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Isolation and Characterization of Tumor-initiating Cells from Sarcoma Patient-derived Xenografts
Published on: June 13, 2019
The role of TLE1 in synovial sarcoma
Sung Wook Seo1, Hyewon Lee, Hyun-Il Lee
1Department of Orthopaedic Surgery, Samsung Medical Center, Sungkyunkwan University, #50, Ilwon-dong, Gangnam-gu, 135-710, Seoul, South Korea.
Summary
Transducin-like enhancer of split 1 (TLE1) is crucial for synovial sarcoma survival. Inhibiting TLE1 suppresses tumor growth and enhances chemotherapy effectiveness by inducing apoptosis via Bcl-2 downregulation.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Synovial sarcoma exhibits poor treatment outcomes due to resistance to conventional therapies.
- Transducin-like enhancer of split 1 (TLE1), a co-repressor, is uniquely expressed in synovial sarcomas, but its function remains unclear.
Purpose of the Study:
- To investigate the functional role of TLE1 in synovial sarcoma.
- To determine if TLE1 inhibition suppresses sarcoma proliferation and enhances doxorubicin cytotoxicity.
Main Methods:
- TLE1 was knocked down using siRNA in synovial sarcoma cells (HS-SYII).
- Cell proliferation was assessed using MTT assays.
- Apoptosis and Bcl-2 expression were analyzed following TLE1 silencing and doxorubicin treatment.
Main Results:
- TLE1 knockdown significantly inhibited HS-SYII cell proliferation but not normal fibroblasts.
- Silencing TLE1 potentiated doxorubicin's cytotoxic effects, primarily through apoptosis induction.
- Bcl-2 was identified as a potential downstream target of TLE1 signaling.
Conclusions:
- TLE1 is essential for synovial sarcoma cell survival.
- Inhibiting TLE1 suppresses proliferation and promotes apoptosis by downregulating Bcl-2 expression, offering a potential therapeutic strategy.
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