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Updated: Sep 3, 2025

Intratibial Osteosarcoma Cell Injection to Generate Orthotopic Osteosarcoma and Lung Metastasis Mouse Models
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Intratibial Osteosarcoma Cell Injection to Generate Orthotopic Osteosarcoma and Lung Metastasis Mouse Models

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Circular RNA ROCK1, a novel circRNA, suppresses osteosarcoma proliferation and migration via altering the

Yize Liu1,2, Guanzhen Qiu2, Yinzhou Luo2

  • 1Department of Orthopedic Surgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, 310003, Hangzhou, China.

Experimental & Molecular Medicine
|July 25, 2022
PubMed

Insights

A novel circular RNA, circROCK1-E3/E4, acts as a tumor suppressor in osteosarcoma (OS). It inhibits OS cell proliferation and metastasis by regulating PTEN, offering potential new therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Osteosarcoma (OS) is the most common bone tumor in children and adolescents.
  • The underlying mechanisms of OS pathogenesis and metastasis are not fully understood.

Purpose of the Study:

  • To investigate the role and mechanism of a novel circular RNA, circROCK1-E3/E4, in osteosarcoma progression.

Main Methods:

  • Investigated circROCK1-E3/E4 expression in OS tissues and cell lines.
  • Performed functional assays (proliferation, cell motility) in OS cells.
  • Utilized nude mouse models to assess in vivo tumor growth and metastasis.
  • Conducted mechanistic studies involving microRNA-532-5p (miR-532-5p) and phosphatase and tensin homolog (PTEN).

Main Results:

  • circROCK1-E3/E4 was downregulated in OS and associated with poor clinical outcomes.
  • circROCK1-E3/E4 suppressed OS cell proliferation and migration.
  • circROCK1-E3/E4 acts as a tumor suppressor by sponging miR-532-5p, leading to PTEN upregulation.
  • In vivo studies showed circROCK1-E3/E4 inhibited tumor growth and lung metastasis.

Conclusions:

  • circROCK1-E3/E4 functions as a tumor suppressor in osteosarcoma.
  • The circROCK1-E3/E4/miR-532-5p/PTEN axis is a key pathway in OS progression.
  • circROCK1-E3/E4 represents a potential therapeutic target for osteosarcoma.

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