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Small nucleolar RNA 42 acts as an oncogene in lung tumorigenesis

Y-P Mei1, J-P Liao, J Shen

  • 1Departments of Pathology, University of Maryland School of Medicine, Baltimore, MD 21201-1192, USA.

Oncogene
|October 12, 2011
PubMed

Insights

Small nucleolar RNA 42 (SNORA42) is overexpressed in non-small cell lung cancer (NSCLC) due to genomic amplification. SNORA42 promotes NSCLC growth and is linked to poorer patient survival, indicating its oncogenic role.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Non-small cell lung cancer (NSCLC) remains a leading cause of cancer mortality, necessitating novel therapeutic and diagnostic strategies.
  • Small nucleolar RNAs (snoRNAs) are increasingly implicated in cancer development, with specific roles in tumorigenesis requiring elucidation.
  • Previous research indicated SNORA42 overexpression in lung tumors, prompting further investigation into its oncogenic potential.

Purpose of the Study:

  • To investigate the role of small nucleolar RNA 42 (SNORA42) in the tumorigenesis of non-small cell lung cancer (NSCLC).
  • To determine the relationship between SNORA42 expression, its genomic alterations, and its functional impact on NSCLC cell behavior.
  • To assess SNORA42 as a potential diagnostic marker and therapeutic target for NSCLC.

Main Methods:

  • Assessed genomic dosages and expression levels of SNORA42 and its host gene KIAA0907 in NSCLC cell lines and normal bronchial epithelial cells.
  • Performed in vitro gain- and loss-of-function analyses of SNORA42 in lung cancer cell lines.
  • Evaluated the in vivo tumorigenicity of SNORA42-manipulated NSCLC cells in mice and analyzed SNORA42 expression in patient tumor tissues.

Main Results:

  • Frequent genomic amplification and consequent overexpression of SNORA42, but not KIAA0907, were observed in lung cancer cells.
  • SNORA42 knockdown inhibited both in vitro and in vivo tumorigenicity of NSCLC cells.
  • Enforced SNORA42 expression promoted cell growth and colony formation in bronchial epithelial cells, partly via p53-dependent apoptosis.
  • Higher SNORA42 expression in patient tumor samples correlated inversely with patient survival.

Conclusions:

  • SNORA42 activation, driven by genomic amplification, plays a significant oncogenic role in NSCLC development.
  • SNORA42 inhibition suppresses NSCLC tumorigenicity, suggesting its potential as a therapeutic target.
  • SNORA42 expression levels may serve as a prognostic biomarker for NSCLC patients.

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