Compound 5-O-Sulfamoyl Adenosine Enhances Cancer Drug Sensitivity by Targeting NSD1 Protein
Researchers report that 5-O-sulfamoyl adenosine (5-SA) inhibits the oncogenic enzyme NSD1, suppresses cancer cell proliferation, and enhances the effectiveness of the chemotherapy drug 5-Fluorouracil (5-FU). NSD1 is a histone methyltransferase whose overexpression is associated with poor cancer prognosis and tumor growth. The findings suggest a potential new strategy for improving chemotherapy outcomes by combining epigenetic inhibition with existing treatments.
A study posted to bioRxiv describes the identification and preclinical testing of 5-O-sulfamoyl adenosine (5-SA) as an inhibitor of NSD1, a histone methyltransferase enzyme implicated in cancer progression. 5-SA demonstrated an IC50 of approximately 54 µM against NSD1, outperforming the structural analog S-Adenosyl-l-Cysteine (SAC), which had an IC50 of 115 µM. In prostate cancer (DU145) and liver cancer (HepG2) cell lines, 5-SA reduced cell viability, impeded proliferation and migration, altered cell cycle progression, and induced apoptosis. The compound also reduced RNA and protein expression of NSD1 and suppressed H3K36me2, a histone modification linked to oncogenic activity. In a xenograft mouse model of prostate cancer, 5-SA alone slowed tumor growth, while its combination with 5-FU synergistically reduced tumor growth and improved animal survival. The authors claim this is the first report demonstrating that NSD1 inhibition via 5-SA can sensitize tumors to 5-FU chemotherapy.
What's missing
As a preprint, this study has not yet undergone peer review. Key limitations include the use of only two cancer cell lines and a single xenograft model, leaving generalizability to other cancer types uncertain. Pharmacokinetic and toxicity profiles of 5-SA in vivo are not reported, and the precise molecular mechanism by which NSD1 inhibition enhances 5-FU sensitivity remains to be fully elucidated. The study does not address potential off-target effects of 5-SA or its metabolic stability.
What different sources said
- bioRxivCenter
Inhibition of NSD1 by 5-O-Sulfamoyl Adenosine improved 5-FU sensitivity by suppressing cancer cell proliferation and xenograft tumor growth
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