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SND1 affects proliferation of hepatocellular carcinoma cell line SMMC-7721 by regulating IGFBP3 expression

Jie Yin1, Jianmin Ding, Li Huang

  • 1Department of Immunology and Biochemistry, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China; Tianjin Key Laboratory of Cellular and Molecular Immunology, Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China; Key laboratory of Educational Ministry of China, Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China; Laboratory of Molecular Immunology, Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China.

Anatomical Record (Hoboken, N.J. : 2007)
|July 24, 2013
PubMed

Insights

Staphylococcal nuclease domain containing 1 (SND1) promotes hepatocellular carcinoma (HCC) by downregulating IGFBP3 and activating IGF signaling. Reducing SND1 inhibits HCC cell proliferation and tumor growth.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Staphylococcal nuclease domain containing 1 (SND1) is a multifunctional protein implicated in various cancers.
  • Its specific role in hepatocellular carcinoma (HCC) progression remains largely uninvestigated.
  • Ectopic SND1 expression is observed in multiple tumor types, suggesting oncogenic potential.

Purpose of the Study:

  • To elucidate the role of SND1 in hepatocellular carcinoma (HCC) progression.
  • To investigate the molecular mechanisms by which SND1 influences HCC cell behavior.
  • To determine the relationship between SND1, IGFBP3, and the insulin-like growth factor (IGF) signaling pathway in HCC.

Main Methods:

  • Immunohistochemistry was used to compare SND1 expression in HCC and adjacent non-tumor tissues.
  • Stable knockdown of SND1 in HCC cell line SMMC-7721 was achieved using shRNA lentiviral vectors.
  • Cell proliferation, clone formation, and tumor formation in nude mice were assessed.
  • Real-time PCR was employed to analyze gene expression within the IGF signaling pathway.
  • Knockdown of IGFBP3 was performed to evaluate its effect on HCC cell proliferation.

Main Results:

  • SND1 expression was significantly higher in HCC tissues compared to adjacent non-tumor tissues.
  • SND1 knockdown reduced HCC cell proliferation, colony formation, and tumor growth in vivo.
  • Decreased SND1 expression led to increased IGF-binding protein 3 (IGFBP3) expression.
  • IGFBP3 knockdown promoted HCC cell proliferation, confirming its tumor-suppressive role.
  • SND1 appears to regulate HCC progression by modulating IGFBP3 expression and IGF signaling.

Conclusions:

  • SND1 plays a crucial role in promoting HCC initiation and progression.
  • SND1 exerts its oncogenic effects by downregulating IGFBP3 expression, thereby activating the IGF signaling pathway.
  • Targeting SND1 may represent a potential therapeutic strategy for hepatocellular carcinoma.
Keywords:
IGF pathwayIGFBP3SMMC-7721SND1cell proliferationhepatocellular carcinoma

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