Changes in aromatase (CYP19) gene promoter usage in non-small cell lung cancer

Masashi Demura, Yoshiki Demura, Shingo Ameshima, Takeshi Ishizaki, Masato Sasaki, Isamu Miyamori, Masakazu Yamagishi, Yoshiyu Takeda, Serdar E. Bulun*

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In humans, aromatase (CYP19) gene expression is regulated via alternative promoters. Activation of each promoter gives rise to a CYP19 mRNA species with a unique 5'-untranslated region. Inhibition of aromatase has been reported to downregulate lung tumor growth. The genetic basis for CYP19 gene expression and aromatase activity in lung cancer remains poorly understood. We analyzed tissues from 15 patients with non-small cell lung cancer (NSCLC) to evaluate CYP19 promoter usage and promoter-specific aromatase mRNA levels in NSCLC tumor tissues and adjacent non-malignant tissues. CYP19 promoter usage was determined by multiplex RT-PCR and aromatase mRNA levels were measured with real-time RT-PCR. In non-malignant tissues, aromatase mRNA was primarily derived from activation of CYP19 promoter I.4. Although promoter I.4 usage was also dominant in tumor tissues, I.4 activation was significantly lower compared with adjacent non-malignant tissues. Activity of promoters I.3, I.1 and I.7 was significantly higher in tumor tissues compared with non-malignant tissues. In 4 of 15 cases of non-small cell lung cancer, switching from CYP19 promoter I.4 to the alternative promoters II, I.1 or I.7 was observed. In 9 cases, there were significantly higher levels of aromatase mRNA in lung tumor tissues compared with adjacent non-malignant tissues. These findings suggest aberrant activation of alternative CYP19 promoters that may lead to upregulation of local aromatase expression in some cases of NSCLC. Further studies are needed to examine the impact of alternative CYP19 promoter usage on local estrogen levels and lung tumor growth.

Original languageEnglish (US)
Pages (from-to)289-293
Number of pages5
JournalLung Cancer
Volume73
Issue number3
DOIs
StatePublished - Sep 2011

Keywords

  • Aromatase
  • CYP19
  • Estrogen
  • Non-small cell lung cancer
  • Promoter
  • Promoter usage

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine
  • Cancer Research

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  • Cite this

    Demura, M., Demura, Y., Ameshima, S., Ishizaki, T., Sasaki, M., Miyamori, I., Yamagishi, M., Takeda, Y., & Bulun, S. E. (2011). Changes in aromatase (CYP19) gene promoter usage in non-small cell lung cancer. Lung Cancer, 73(3), 289-293. https://doi.org/10.1016/j.lungcan.2011.01.003