Improving immunological tumor microenvironment using electro-hyperthermia followed by dendritic cell immunotherapy

Area of Science:

• Oncology
• Immunology
• Biomedical Engineering

Background:

• Intratumoral dendritic cell (DC) therapy often fails due to poor tumor microenvironments (TME).
• Modulated electro-hyperthermia (mEHT) selectively targets cell membranes, inducing apoptosis and potentially overcoming TME limitations.
• mEHT may enhance DC immunotherapy by converting local cell death into a systemic immune response.

Purpose of the Study:

• To investigate the efficacy of combining mEHT with intratumoral DC immunotherapy.
• To assess the impact of mEHT on tumor apoptosis, immune cell infiltration, and anti-tumor immune responses.
• To determine if mEHT can create a favorable TME for enhanced DC immunotherapy.

Main Methods:

• Utilized the CT26 murine colorectal cancer model.
• Applied mEHT to tumors, heating to 42°C for 30 minutes.
• Administered intratumoral injection of matured DCs 24 hours post-mEHT.

Main Results:

• mEHT significantly increased tumor cell apoptosis and heat shock protein 70 (Hsp70) release.
• Combination therapy (mEHT-DCs) markedly inhibited tumor growth compared to monotherapies.
• mEHT-DC treatment enhanced leukocyte and macrophage infiltration, including eosinophils, and promoted tumor-specific T cell activity.

Conclusions:

• mEHT effectively induces tumor cell apoptosis and Hsp70 release, distinct from conventional hyperthermia.
• mEHT optimizes the TME, facilitating a cascade immune response beneficial for DC immunotherapy.
• Combining mEHT with DC immunotherapy shows promise for improving cancer treatment outcomes.