2. Academic Validation
  3. Computer-Aided Discovery of Small Molecules Targeting the RNA Splicing Activity of hnRNP A1 in Castration-Resistant Prostate Cancer

Computer-Aided Discovery of Small Molecules Targeting the RNA Splicing Activity of hnRNP A1 in Castration-Resistant Prostate Cancer

  • Molecules. 2019 Feb 20;24(4):763. doi: 10.3390/molecules24040763.
Lavinia A Carabet 1,  Eric Leblanc 2,  Nada Lallous 3,  Helene Morin 4,  Fariba Ghaidi 5,  Joseph Lee 6,  Paul S Rennie 7,  Artem Cherkasov 8
Affiliations

Affiliations

  • 1 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. lcarabet@prostatecentre.com.
  • 2 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. eleblanc@prostatecentre.com.
  • 3 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. nlallous@prostatecentre.com.
  • 4 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. hmorin@prostatecentre.com.
  • 5 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. fghaidi@prostatecentre.com.
  • 6 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. jlee@prostatecentre.com.
  • 7 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. prennie@prostatecentre.com.
  • 8 Vancouver Prostate Centre, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada. acherkasov@prostatecentre.com.
PMID: 30791548 DOI: 10.3390/molecules24040763
Abstract

The heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) is a versatile RNA-binding protein playing a critical role in alternative pre-mRNA splicing regulation in Cancer. Emerging data have implicated hnRNP A1 as a central player in a splicing regulatory circuit involving its direct transcriptional control by c-Myc oncoprotein and the production of the constitutively active ligand-independent alternative splice variant of Androgen Receptor, AR-V7, which promotes castration-resistant prostate Cancer (CRPC). As there is an urgent need for effective CRPC drugs, targeting hnRNP A1 could, therefore, serve a dual purpose of preventing AR-V7 generation as well as reducing c-Myc transcriptional output. Herein, we report compound VPC-80051 as the first small molecule inhibitor of hnRNP A1 splicing activity discovered to date by using a computer-aided drug discovery approach. The inhibitor was developed to target the RNA-binding domain (RBD) of hnRNP A1. Further experimental evaluation demonstrated that VPC-80051 interacts directly with hnRNP A1 RBD and reduces AR-V7 messenger levels in 22Rv1 CRPC cell line. This study lays the groundwork for future structure-based development of more potent and selective small molecule inhibitors of hnRNP A1⁻RNA interactions aimed at altering the production of cancer-specific alternative splice isoforms.

Keywords

alternative splicing; castration-resistant prostate cancer; computer-aided drug discovery; hnRNP A1; protein–RNA interactions; small molecule inhibitors.

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