In vitro immune and redox response induced by cationic cellulose-based nanomaterials

Area of Science:

• Nanomaterials Science
• Immunology
• Biochemistry

Background:

• Cellulose nanocrystals (CNCs) possess unique properties for diverse applications.
• Understanding nanomaterial-induced immune responses is crucial for assessing adjuvanticity.
• Investigating immunomodulation mechanisms requires correlating physicochemical traits with biological effects.

Purpose of the Study:

• To explore immunomodulation and redox activity of two cationic CNC derivatives.
• To elucidate the in vitro mechanisms of action for CNC-METAC-1B and CNC-METAC-2B.
• To associate observed biological effects with nanomaterial physicochemical characteristics.

Main Methods:

• Utilized human peripheral blood mononuclear cells and mouse macrophage cell lines (J774A.1).
• Assessed short-term exposure effects on immune responses.
• Measured Interleukin-1 beta (IL-1β) secretion and mitochondrial reactive oxygen species (ROS) generation.

Main Results:

• Observed distinct immunomodulatory activities between CNC-METAC-1B and CNC-METAC-2B.
• CNC-METAC-2B induced IL-1β secretion early (2h), while CNC-METAC-1B decreased it later (24h).
• Both CNCs increased mitochondrial ROS levels upon short-term exposure; size differences may explain functional discrepancies.

Conclusions:

• Cationic CNC derivatives exhibit complex, time-dependent immunomodulatory effects.
• Nanomaterial size appears to be a key factor influencing biological outcomes, more so than surface charge.
• This study provides foundational knowledge for developing cationic CNCs as potential immunomodulators.