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Unintended target effect of anti-BCL-2 DNAi

Abdul Shukkur Ebrahim1, Mustapha Kandouz2, Nada Emara1

  • 1Lymphoma Research Laboratory.

Cancer Management and Research
|October 10, 2017
PubMed
Abstract

Insights

The novel compound PNT2258, intended to inhibit B-cell lymphoma 2 (BCL-2), also impacts cyclin-dependent kinase-4 (CDK4) expression. This suggests DNA interference (DNAi) may target multiple genes, broadening its therapeutic potential in non-Hodgkin's lymphoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • The compound PNT2258 was previously shown to inhibit B-cell lymphoma 2 (BCL-2) transcription via DNA interference (DNAi).
  • PNT2258 demonstrated efficacy in preclinical models and a Phase II trial for non-Hodgkin's lymphoma (NHL).
  • Concerns arose regarding PNT100's homology with other gene promoters, potentially leading to unintended targets.

Purpose of the Study:

  • To identify unintended target genes of PNT2258.
  • To investigate the role of cyclin-dependent kinase-4 (CDK4) as a potential off-target in NHL.

Main Methods:

  • Conducted Basic Local Alignment Search Tool (BLAST) homology searches with PNT100 sequences.
  • Performed CDK4 promoter assays in K562 cells.
  • Assessed CDK4 protein expression in various lymphoma cell lines (WSU-FSCCL, WSU-DLCL, WSU-WM).

Main Results:

  • BLAST confirmed PNT100 homology with the BCL-2 gene and identified a 14-base sequence with 100% homology to CDK4.
  • PNT2258 significantly inhibited CDK4 promoter activity in K562 cells.
  • PNT2258 downregulated CDK4 protein expression in WSU-FSCCL and WSU-WM cell lines.

Conclusions:

  • DNA interference (DNAi) can affect both intended (BCL-2) and unintended (CDK4) genes.
  • PNT2258 influences CDK4 expression and promoter activity, indicating a broader mechanism of action.
  • These findings suggest a more complex therapeutic mechanism for DNAi agents in cancer treatment.
Keywords:
BCL-2BLASTCDK4PNT2258non-Hodgkin’s lymphoma

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