Breakthrough in Cancer Gene Therapy: Mitochondrial Dysfunction overcomes T Cell Exhaustion

Strategic Insights -

Research conducted at Tongji University has led to a new study on cancer gene therapy, focusing on manganese-based STING-activating tumor immunotherapy. The study highlights the limitations of this approach due to T cell exhaustion, with mitochondrial dysfunction being a key contributing factor. Researchers employed liposomes as nano-reactors to facilitate the reaction between pre-loaded Mn² and O in the presence of SPD, enhancing mitochondrial function in T cells and co-delivering Mn, SPD, and O.

Key Takeaways:

  • The study found that modulating mitochondrial function during manganese-based immunotherapy offers a promising strategy to reverse T cell exhaustion.
  • Spermidine (SPD) enhances mitochondrial function in T cells, and its co-delivery with Mn is a potential therapeutic approach.
  • The use of liposomes as nano-reactors facilitates the reaction between pre-loaded Mn² and O in the presence of SPD, forming MnO(OH) precipitates within the liposomes.
  • These liposomes function as nanofactories, further processing MnO(OH) under the regulation of the tumor microenvironment (TME) and delivering Mn, SPD, and O.
  • The STING-activating nanofactory achieves a 2.44-fold increase in tumor suppression compared to MnCl, along with a 47% rise in CD8 T cell infiltration, a 62.1% reduction in PD-1 expression, and a 110% increase in IFN-g secretion.
  • The study highlights the importance of addressing mitochondrial dysfunction in exhausted T cells to enhance manganese-based tumor immunotherapy.

Statistics:

  • Tumor suppression increase: 2.44-fold compared to MnCl
  • CD8 T cell infiltration increase: 47%
  • PD-1 expression reduction: 62.1%
  • IFN-g secretion increase: 110%
  • Funding sources:

+ National Natural Science Foundation of China

+ Talent Program of Shanghai Municipal Health Commission

+ Natural Science Foundation of Shanghai Municipality

+ Sci-tech Innovation 2030 Major Project of Brain Science And Brain-inspired Intelligence Technology

+ Fundamental Research Funds For The Central Universities

Sources:

  • The STING-activating nanofactory relieves T cell exhaustion in Mn-based tumor immunotherapy by regulating mitochondrial dysfunction. Journal of Nanobiotechnology, 2025,23(1):1-18.
  • doi.org/10.1186/s12951-025-03469-w