Precisely Striking Tumors without Adjacent Normal Tissue Damage via Mitochondria-Templated Accumulation

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Oncology

Background:

• Damage to adjacent normal tissue is a critical challenge in tumor therapy, particularly for brain tumors.
• Random drug diffusion and tumor complexity hinder effective treatment strategies.
• Selective targeting of tumor cells is essential for minimizing side effects.

Purpose of the Study:

• To develop a method for selective hyperthermia in tumor mitochondria.
• To investigate the use of gold nanoparticles with a mitochondria-targeting moiety for cancer therapy.
• To evaluate the efficacy and safety of this targeted approach in vivo.

Main Methods:

• Synthesized spherical gold nanoparticles functionalized with triphenyl phosphonium (a mitochondria-targeting moiety).
• Investigated the preferential accumulation of these nanoparticles within tumor mitochondria.
• Utilized interparticle plasmonic coupling to activate light-thermal conversion for hyperthermia.
• Assessed temperature changes and mitochondrial dysfunction in tumor and adjacent normal tissues in vivo.

Main Results:

• Gold nanoparticles selectively accumulated in tumor mitochondria, activating interparticle plasmonic coupling.
• Targeted hyperthermia led to mitochondrial dysfunction specifically in tumor cells.
• In vivo studies showed a nearly 4-fold temperature increase in tumor tissue compared to adjacent normal tissue upon irradiation.
• Negligible hyperthermia and mitochondrial dysfunction were observed in normal tissues.

Conclusions:

• A subcellular organelle-templated nanoparticle accumulation strategy enables highly selective tumor therapy.
• This approach effectively induces localized hyperthermia and mitochondrial dysfunction in tumors.
• The developed method shows potential for cancer treatment with significantly reduced local side effects.