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Updated: May 28, 2026
11:19
Merging Absolute and Relative Quantitative PCR Data to Quantify STAT3 Splice Variant Transcripts
Published on: October 9, 2016
Antitumorigenic potential of STAT3 alternative splicing modulation
Francesca Zammarchi1, Elisa de Stanchina, Eirini Bournazou
1Department of Molecular Pharmacology and Chemistry, Antitumor Assessment Core Facility, Breast Cancer Service, Memorial Sloan-Kettering Cancer Center Imaging Center, and Experimental Therapeutic Center, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.
Summary
Modified antisense oligonucleotides shift splicing to induce STAT3β, promoting apoptosis and cell-cycle arrest. This splicing redirection strategy shows potent antitumorigenic effects in vivo.
Area of Science:
- Molecular Biology
- Cancer Biology
- Genetics
Background:
- Signal transducer and activator of transcription 3 (STAT3) is a key regulator in oncogenic pathways.
- STAT3α is the canonical isoform, while the STAT3β splicing variant acts as a dominant-negative regulator.
Purpose of the Study:
- To investigate the therapeutic potential of targeting STAT3 alternative splicing.
- To compare the effects of STAT3β induction via splicing redirection versus total STAT3 knockdown.
Main Methods:
- Utilized modified antisense oligonucleotides to target a splicing enhancer for STAT3 exon 23.
- Induced endogenous STAT3β expression and compared its effects to STAT3 knockdown via FSD-NMD.
- Analyzed molecular signatures and tumor regression in a xenograft cancer model.
Main Results:
- Splicing redirection specifically increased STAT3β over STAT3α, leading to apoptosis and cell-cycle arrest.
- STAT3β induction demonstrated a unique molecular signature distinct from total STAT3 knockdown.
- In vivo redirection of STAT3 splicing resulted in significant tumor regression.
Conclusions:
- Pharmacological manipulation of STAT3 alternative splicing is a viable cancer therapeutic strategy.
- Endogenous splicing reprogramming offers powerful antitumorigenic properties by inducing STAT3β.
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