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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
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MicroRNA-638 inhibits cell proliferation by targeting suppress PIM1 expression in human osteosarcoma

Xiao-Xu Wang1, Jue Liu2, Yi-Min Tang3

  • 1Department of Joint Surgery, the Second Affiliated Hospital, University of South China, 35 Jiefang Road, Hengyang, Hunan, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|January 5, 2017
PubMed

Insights

MicroRNA 638 (miR-638) acts as a tumor suppressor in osteosarcoma (OS) by downregulating proviral integration site for Moloney murine leukemia virus 1 (PIM1). Lower miR-638 and higher PIM1 levels correlate with poor OS prognosis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are crucial in carcinogenesis, but their specific roles and mechanisms remain under investigation.
  • Osteosarcoma (OS) is a primary bone cancer with complex molecular underpinnings.
  • Understanding miRNA functions in OS is vital for developing targeted therapies.

Purpose of the Study:

  • To investigate the function and mechanism of miR-638 in osteosarcoma (OS).
  • To identify the downstream target gene of miR-638 in OS.
  • To explore the clinical significance of miR-638 and its target in OS.

Main Methods:

  • Real-time PCR to quantify miR-638 expression and DNA copy number.
  • CCK8 assay to assess cell proliferation.
  • Bioinformatics, luciferase reporter assay, and Western blotting to identify and validate PIM1 as a miR-638 target.
  • Immunohistochemical assay to evaluate PIM1 expression in clinical OS tissues.

Main Results:

  • miR-638 was significantly downregulated in OS tissues compared to non-cancerous tissues (NCTs), associated with lower DNA copy number.
  • Overexpression of miR-638 inhibited OS cell proliferation in vitro.
  • Proviral integration site for Moloney murine leukemia virus 1 (PIM1) was identified as a direct target of miR-638.
  • PIM1 was overexpressed in OS tissues and correlated with poor patient survival.
  • Silencing PIM1 mimicked the tumor-suppressive effects of miR-638.

Conclusions:

  • miR-638 functions as a tumor suppressor in osteosarcoma.
  • miR-638 exerts its tumor-suppressive role by inhibiting PIM1 expression.
  • The miR-638/PIM1 axis represents a potential therapeutic target for osteosarcoma.
Keywords:
OsteosarcomaPIM1ProliferationmiR-638

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