Somatic nuclear auto-antigenic sperm protein sensitizes human breast cancer cells to 5-Fluorouracil
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Updated: Oct 4, 2025
Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo
Published on: February 6, 2015
Yanjing Huang1, Shenghui Yang1, Weiling Yu2
1Department of Medical Oncology, Hainan General Hospital Affiliated to Hainan Medical University, Haikou, 570311, Hainan, China.
Purpose:
To assess the potential role of nuclear auto-antigenic sperm protein (NASP) in the cellular sensitivity to 5-Fluorouracil (5-FU) in breast cancer cells.
Methods:
The expression of two NASP isotypes, namely somatic NASP (sNASP) and testis NASP (tNASP) in breast cancer lines were detected under 5-FU treatment using real-time polymerase chain reaction and western blot assays. NASP effect on cellular viability and apoptosis under 5-FU treatment were evaluated. The interaction between NASP and its downstream proteins were evaluated using the co-immunoprecipitation (Co-IP) assays.
Results:
5-FU significantly decreased the mRNA and protein expression levels of sNASP. Inhibition of sNASP increased cellular viability, colony formation ability, but reduced apoptosis in tested cell lines in response to 5-FU, which were reversed by sNASP over-expression. Further study reveals 5-FU disrupts sNASP/TNF receptor-associated factor 6 (TRAF6) complex, potentiates cellular sensitivity to 5-FU via NK-kB.
Conclusion:
Our findings suggest sNASP is a novel molecular target having potential to overcome the resistance to 5-FU in breast cancer cells.
Insights
Nuclear auto-antigenic sperm protein (NASP) influences breast cancer cell sensitivity to 5-Fluorouracil (5-FU). Inhibiting somatic NASP (sNASP) increases 5-FU resistance, suggesting sNASP as a potential therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Therapeutics
Background:
- Breast cancer treatment often involves chemotherapy, with 5-Fluorouracil (5-FU) being a common agent.
- Understanding mechanisms of chemoresistance is crucial for improving treatment efficacy.
Purpose of the Study:
- To investigate the role of nuclear auto-antigenic sperm protein (NASP) in breast cancer cell sensitivity to 5-FU.
- To explore NASP as a potential therapeutic target for overcoming 5-FU resistance.
Main Methods:
- Real-time PCR and Western blot to detect NASP isotype expression (sNASP, tNASP) under 5-FU treatment.
- Assays to evaluate NASP's effect on cellular viability and apoptosis.
- Co-immunoprecipitation (Co-IP) to study NASP-protein interactions.
Main Results:
- 5-FU treatment decreased sNASP mRNA and protein levels.
- sNASP inhibition enhanced cellular viability and colony formation while reducing apoptosis in response to 5-FU.
- Overexpression of sNASP reversed these effects.
- 5-FU disrupted the sNASP/TRAF6 complex, potentiating sensitivity via NF-κB signaling.
Conclusions:
- somatic NASP (sNASP) plays a significant role in modulating breast cancer cell response to 5-FU.
- sNASP is a novel molecular target for overcoming 5-FU resistance in breast cancer.
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