Nanomaterials Trigger Functional Anti-Tumoral Responses in Primary Human Immune Cells

Area of Science:

• Immunology
• Nanomedicine
• Materials Science

Background:

• Nanoparticles (NPs) are explored for targeted delivery in cancer immunotherapy.
• The impact of drug-free nanomaterials on immune cells, particularly NK and T cells, is largely unknown.
• Understanding nanomaterial-immune interactions is crucial for developing effective nanoimmunotherapies.

Purpose of the Study:

• To characterize the molecular and functional response of human NK and pan T cells to common biomedical NPs.
• To evaluate the immunomodulatory effects of drug-free nanomaterials.
• To identify NPs suitable for immune system reactivation in cancer patients.

Main Methods:

• Screening of five common NPs for toxicity on immune cells.
• Selection of ultrasmall silica-based gadolinium (Si-Gd) NPs and poly(lactic-co-glycolic acid) (PLGA) NPs for further study.
• Bulk RNA-sequencing and flow cytometry analysis of NK and pan T cells exposed to selected NPs.

Main Results:

• PLGA NPs induced transcriptional changes indicative of activation in NK and pan T cells.
• PLGA NPs enhanced NK cell anti-tumoral functions in a low-cytokine environment.
• Si-Gd NPs demonstrated inhibitory effects on T cell activation and functional responses.

Conclusions:

• PLGA NPs show potential for reactivating the immune system in cancer patients.
• Si-Gd NPs may negatively impact T cell-mediated anti-tumor immunity.
• Drug-free nanomaterials have distinct immunomodulatory effects that warrant careful consideration in nanoimmunotherapy design.