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Inhibitory effect of PPARγ on NR0B1 in tumorigenesis of lung adenocarcinoma

Yoshiyuki Susaki1, Masayoshi Inoue, Masato Minami

  • 1Department of Pathology, Osaka University Graduate School of Medicine, Suita 565-0871, Japan.

International Journal of Oncology
|July 31, 2012
PubMed

Insights

Nuclear receptor NR0B1 promotes lung adenocarcinoma by inhibiting PPARγ, a tumor suppressor. High NR0B1 and low PPARγ levels predict poor prognosis in early-stage lung cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • NR0B1, an orphan nuclear receptor, is found in lung adenocarcinoma side population cells.
  • NR0B1 knockdown reduces lung adenocarcinoma's tumorigenic and anti-apoptotic properties.
  • Peroxisome proliferator-activated receptor γ (PPARγ) induces apoptosis in lung cancer cells.

Purpose of the Study:

  • To investigate the interaction between NR0B1 and PPARγ in lung adenocarcinoma.
  • To elucidate the functional consequences of this interaction on tumor progression and prognosis.

Main Methods:

  • Examined NR0B1 and PPARγ interaction using co-immunoprecipitation.
  • Assessed transactivation inhibition and effects on aldehyde dehydrogenase (ALDH) activity and ALDH3A1 expression.
  • Analyzed clinical data from Pathological-Stage IA lung adenocarcinoma cases.

Main Results:

  • NR0B1 inhibits PPARγ transactivation in lung adenocarcinoma via its N-terminal LxxLL motifs.
  • NR0B1 induces ALDH activity and ALDH3A1 expression, promoting tumorigenesis, while PPARγ overexpression counteracts this effect.
  • PPARγ inhibition enhances NR0B1-induced ALDH activity.
  • High NR0B1 and low PPARγ expression correlate with a negative prognosis in Pathological-Stage IA lung adenocarcinoma.

Conclusions:

  • NR0B1 and PPARγ have a reciprocal relationship influencing lung adenocarcinoma malignancy.
  • NR0B1 promotes lung adenocarcinoma progression by antagonizing PPARγ.
  • The NR0B1/PPARγ axis represents a potential therapeutic target and prognostic biomarker in lung adenocarcinoma.

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