Adapting AlphaLISA high throughput screen to discover a novel small-molecule inhibitor targeting protein arginine methyltransferase 5 in pancreatic and colorectal cancers

Lakshmi Prabhu, Han Wei, Lan Chen, Özlem Demir, George Sandusky, Emily Sun, John Wang, Jessica Mo, Lifan Zeng, Melissa Fishel, Ahmad Safa, Rommie Amaro, Murray Korc, Zhong Yin Zhang, Tao Lu

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Pancreatic ductal adenocarcinoma (PDAC) and colorectal cancer (CRC) are notoriously challenging for treatment. Hyperactive nuclear factor κB (NF-κB) is a common culprit in both cancers. Previously, we discovered that protein arginine methyltransferase 5 (PRMT5) methylated and activated NF-κB. Here, we show that PRMT5 is highly expressed in PDAC and CRC. Overexpression of PRMT5 promoted cancer progression, while shRNA knockdown showed an opposite effect. Using an innovative AlphaLISA high throughput screen, we discovered a lead compound, PR5-LL-CM01, which exhibited robust tumor inhibition effects in both cancers. An in silico structure prediction suggested that PR5-LL-CM01 inhibits PRMT5 by binding with its active pocket. Importantly, PR5-LL-CM01 showed higher anti-tumor efficacy than the commercial PRMT5 inhibitor, EPZ015666, in both PDAC and CRC. This study clearly highlights the significant potential of PRMT5 as a therapeutic target in PDAC and CRC, and establishes PR5-LL-CM01 as a promising basis for new drug development in the future.

Original languageEnglish (US)
Pages (from-to)39963-39977
Number of pages15
JournalOncotarget
Volume8
Issue number25
DOIs
StatePublished - Jan 1 2017

Keywords

  • AlphaLISA
  • Colorectal cancer
  • PRMT5
  • Pancreatic ductal adenocarcinoma
  • Small-molecule inhibitor

ASJC Scopus subject areas

  • Oncology

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