Thermally controlled state switches for macrophage immunotherapy

Area of Science:

• Biotechnology
• Immunology
• Genetic Engineering

Background:

• Cellular immunotherapies offer potential treatments for cancer, autoimmune diseases, and heart disease.
• Controlling the activity of engineered cells is crucial to prevent adverse effects in healthy tissues.
• Spatial activation using external energy, like ultrasound-induced heating, is a promising strategy for precise control.

Purpose of the Study:

• To design and characterize a genetic circuit for controlled macrophage activation.
• To enable stable transcriptional activation of macrophages via a thermal stimulus.
• To provide a precise control element for cell-therapeutic agents.

Main Methods:

• Development of a genetic circuit enabling transcriptional activation of macrophages.
• Characterization of the genetic circuit's response to thermal stimuli.
• In vivo testing of the bioswitch in a mouse macrophage cell line after ultrasound heating.

Main Results:

• The genetic circuit demonstrated stable transcriptional activation of macrophages following a brief thermal stimulus.
• Ultrasound heating successfully activated the bioswitch, leading to reporter gene expression or IL-12 secretion.
• Spatially localized gene expression was maintained for at least 14 days post-activation in vivo.

Conclusions:

• A novel thermal bioswitch for macrophages has been successfully designed and validated.
• This bioswitch allows for precise, spatially controlled gene expression in engineered macrophages using ultrasound.
• The developed thermal bioswitch offers a significant advancement for the safe and effective application of cell-based therapies.