ArticleResearch square2026
Exon-skipping antisense oligonucleotides targeting SUMO1 and SUMO2 demonstrate chemosensitizing effects in NSCLC cells in tissue culture.
Article in Research square, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Lung cancer remains a leading cause of cancer-related death, highlighting the urgent need for new treatment strategies. SUMOylation, a post-translational modification that regulates DNA repair, replication, and cell cycle progression, is often increased in cancers and is a promising therapeutic target. Previously, we identified alternative splicing events affecting the SUMO transcripts, resulting in variant mRNAs coding for both non-conjugatable (SUMO1α and SUMO2α) and conjugatable (SUMO3α) isoforms-potentially helping to regulate overall cellular SUMOylation. In this study, we investigated whether increasing the levels of the transcripts coding for the non-conjugatable isoforms could decrease SUMOylation and improve chemotherapy efficacy in non-small cell lung cancer (NSCLC). To test this, we designed two sets of exon-skipping morpholinos called SUM2IN and SUMO1IN, targeting the pre-mRNAs of SUMO2 and SUMO1, respectively, and tested them in A549 and HCC827 cell lines. While treatment with SUM2IN significantly increased SUMO2α mRNA and reduced overall SUMO1 and SUMO2 conjugation in all tested cell lines, SUM1IN affected the proportion of SUMO1 mRNA variants and overall SUMO conjugation in a cell-type-specific manner. Still, both SUM2IN and SUM1IN altered cell cycle progression, decreased cell growth, and enhanced the cytotoxic effects of cisplatin and etoposide in A549 and HCC827 cells, while having a notably smaller impact on these parameters in the non-malignant lung fibroblast cell line HEL-299. Therefore, SUM2IN and SUM1IN display chemosensitizing activity against NSCLC and provide a strong foundation for developing SUMO-targeted chemosensitizers for NSCLC and other aggressive human cancers.
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