Superoxide dismutase 1 (SOD1) is a target for a small molecule identified in a screen for inhibitors of the growth of lung adenocarcinoma cell lines

Proc Natl Acad Sci U S A. 2011 Sep 27;108(39):16375-80. doi: 10.1073/pnas.1113554108. Epub 2011 Sep 19.

Abstract

We previously described four small molecules that reduced the growth of lung adenocarcinoma cell lines with either epidermal growth factor receptor (EGFR) or KRAS mutations in a high-throughout chemical screen. By combining affinity proteomics and gene expression analysis, we now propose superoxide dismutase 1 (SOD1) as the most likely target of one of these small molecules, referred to as lung cancer screen 1 (LCS-1). siRNAs against SOD1 slowed the growth of LCS-1 sensitive cell lines; conversely, expression of a SOD1 cDNA increased proliferation of H358 cells and reduced sensitivity of these cells to LCS-1. In addition, SOD1 enzymatic activity was inhibited in vitro by LCS-1 and two closely related analogs. These results suggest that SOD1 is an LCS-1-binding protein that may act in concert with mutant proteins, such as EGFR and KRAS, to promote cell growth, providing a therapeutic target for compounds like LCS-1.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / enzymology
  • Adenocarcinoma / pathology*
  • Cell Division / drug effects*
  • Cell Line, Tumor
  • Gene Expression Profiling
  • Humans
  • Lung Neoplasms / enzymology
  • Lung Neoplasms / pathology*
  • RNA, Small Interfering / genetics
  • Superoxide Dismutase / drug effects
  • Superoxide Dismutase / genetics
  • Superoxide Dismutase / metabolism*
  • Superoxide Dismutase-1

Substances

  • RNA, Small Interfering
  • SOD1 protein, human
  • Superoxide Dismutase
  • Superoxide Dismutase-1