Oncotarget

Priority Research Papers:

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 and Tao Lu _

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Oncotarget. 2017; 8:39963-39977. https://doi.org/10.18632/oncotarget.18102

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Abstract

Lakshmi Prabhu1, Han Wei1, Lan Chen2,3,4, Özlem Demir5, George Sandusky6, Emily Sun1, John Wang1, Jessica Mo1, Lifan Zeng2,3, Melissa Fishel9, Ahmad Safa1, Rommie Amaro5, Murray Korc7, Zhong-Yin Zhang3,4 and Tao Lu1,3,8

1 Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN, USA

2 Chemical Genomics Core Facility, Indiana University School of Medicine, Indianapolis, IN, USA

3 Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, USA

4 Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, USA

5 Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA

6 Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN, USA

7 Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA

8 Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA

9 Department of Pediatrics, Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA

Correspondence to:

Tao Lu, email:

Keywords: AlphaLISA, colorectal cancer, pancreatic ductal adenocarcinoma, PRMT5, small-molecule inhibitor

Received: December 02, 2016 Accepted: April 28, 2017 Published: May 23, 2017

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.


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