Mitogen-activated protein kinase inhibition reduces mucin 2 production and mucinous tumor growth

Ashok K. Dilly, Xinxin Song, Herbert J. Zeh, Zong S. Guo, Yong J. Lee, David L. Bartlett, Haroon A. Choudry*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Excessive accumulation of mucin 2 (MUC2) protein (a gel-forming secreted mucin) within the peritoneal cavity is the major cause of morbidity and mortality in pseudomyxoma peritonei (PMP), a unique mucinous malignancy of the appendix. Mitogen-activated protein kinase (MAPK) signaling pathway is upregulated in PMP and has been shown to modulate MUC2 promoter activity. We hypothesized that targeted inhibition of the MAPK pathway would be a novel, effective, and safe therapeutic strategy to reduce MUC2 production and mucinous tumor growth. We tested RDEA119, a specific MEK1/2 (MAPK extracellular signal-regulated kinase [ERK] kinase) inhibitor, in MUC2-secreting LS174T cells, human PMP explant tissue, and in a unique intraperitoneal murine xenograft model of PMP. RDEA119 reduced ERK1/2 phosphorylation and inhibited MUC2 messenger RNA and protein expression in vitro. In the xenograft model, chronic oral therapy with RDEA119 inhibited mucinous tumor growth in an MAPK pathway-dependent manner and this translated into a significant improvement in survival. RDEA119 downregulated phosphorylated ERK1/2 and nuclear factor κB p65 protein signaling and reduced activating protein 1 (AP1) transcription factor binding to the MUC2 promoter in LS174T cells. This study provides a preclinical rationale for the use of MEK inhibitors to treat patients with PMP.

Original languageEnglish (US)
Pages (from-to)344-354
Number of pages11
JournalTranslational Research
Issue number4
StatePublished - Oct 1 2015

ASJC Scopus subject areas

  • General Medicine
  • Biochemistry, medical
  • Public Health, Environmental and Occupational Health


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