Macrophages behavior on different NIPAm-based thermoresponsive substrates

Area of Science:

• Biomaterials Science
• Immunology
• Cell Biology

Background:

• Thermoresponsive materials are utilized in cell culture for non-enzymatic cell harvesting.
• The immunological response to these materials, particularly in immune cells like macrophages, remains understudied.
• RAW264.7 cells, a standard model for immune activation, are difficult to detach enzymatically.

Purpose of the Study:

• To compare the effects of various thermoresponsive film compositions on macrophage cells (RAW264.7).
• To explore the use of thermoresponsive materials for macrophage cultivation and non-enzymatic detachment.
• To assess the immunological impact of thermoresponsive materials on macrophages during detachment.

Main Methods:

• Fabrication of N-isopropylacrylamide-based polymer films using spin coating and solvent casting.
• Cultivation of RAW264.7 cells on thermoresponsive films of varying thickness and composition.
• Assessment of cell adhesion, proliferation, and detachment via temperature reduction.
• Analysis of macrophage activation through cytokine secretion and surface receptor profiling.

Main Results:

• Cell adhesion and proliferation on thermoresponsive films were dependent on coating thickness and composition.
• RAW264.7 cells were successfully detached from the films upon lowering the temperature.
• Detached RAW264.7 cells showed no signs of immune activation, with low cytokine levels and unaltered surface receptor profiles.

Conclusions:

• Thermoresponsive materials can be effectively used for macrophage cultivation and non-enzymatic harvesting.
• The detachment method preserves macrophage phenotype and avoids immune activation.
• These findings support the use of thermoresponsive polymers as a biocompatible platform for immune cell culture.