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MicroRNA-375 functions as a tumor suppressor in osteosarcoma by targeting PIK3CA

Zhi-cai Shi1, Xue-rong Chu2, Yun-gang Wu1

  • 1Department of Orthopedics, Changhai Hospital, The Second Military Medical University, Shanghai, 200433, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|June 4, 2015
PubMed

Insights

MicroRNA-375 (miR-375) is downregulated in osteosarcoma, suppressing tumor growth by targeting PIK3CA and inhibiting the PI3K/Akt pathway. Restoring miR-375 levels offers a potential therapeutic strategy for osteosarcoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Osteosarcoma is a prevalent primary bone malignancy in children and adults.
  • Aberrant microRNA (miRNA) expression is implicated in various cancers, including osteosarcoma.
  • The specific miRNAs regulating osteosarcoma progression remain incompletely understood.

Purpose of the Study:

  • To investigate the role of miR-375 in osteosarcoma.
  • To identify the molecular targets and pathways regulated by miR-375 in osteosarcoma.

Main Methods:

  • Quantitative real-time PCR to assess miR-375 expression in osteosarcoma tissues and cell lines.
  • Western blotting and qRT-PCR to analyze PIK3CA expression.
  • Cell proliferation assays (in vitro) to evaluate the functional impact of miR-375.
  • Bioinformatic analysis and luciferase reporter assays to confirm PIK3CA as a direct target of miR-375.

Main Results:

  • miR-375 was significantly downregulated in osteosarcoma tissues and cell lines compared to normal controls.
  • Overexpression of miR-375 reduced PIK3CA (phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit alpha) expression at both mRNA and protein levels.
  • miR-375 overexpression suppressed osteosarcoma cell proliferation in vitro, while its inhibition promoted tumor growth.
  • PIK3CA was validated as a direct target of miR-375, and its downregulation by miR-375 led to the suppression of the PI3K/Akt signaling pathway.

Conclusions:

  • miR-375 acts as a tumor-suppressive miRNA in osteosarcoma.
  • Targeting PIK3CA by miR-375 inhibits osteosarcoma cell proliferation and tumorigenesis.
  • miR-375 represents a potential therapeutic target for osteosarcoma treatment.
Keywords:
Cell proliferationMicroRNAOsteosarcomaPIK3CA

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