Immune Profiling of Polysaccharide Submicron Vesicles.

Area of Science:

• Biomaterials Science
• Immunology
• Nanotechnology

Background:

• Alginate (ALG) and chitosan (CS) are widely used in biomedical fields.
• Limited data exists on their specific immune responses.
• Novel submicron vesicle (SV) systems combining ALG and CS require immunocompatibility assessment.

Purpose of the Study:

• To synthesize and characterize alginate-core/chitosan-shell submicron vesicles (SV).
• To evaluate the in vitro immune response of SVs using human peripheral blood mononuclear cells (PBMCs).
• To assess the impact of SVs on PBMC viability, uptake, and activation.

Main Methods:

• Synthesis of alginate-core/chitosan-shell submicron vesicles (SV).
• Ex vivo evaluation of SVs using human peripheral blood mononuclear cells (PBMCs).
• Flow cytometry analysis of PBMC uptake, viability (necrosis/apoptosis), and activation markers (CD69, CD25, CD80, TNF-α, IL-6).

Main Results:

• SVs were internalized by PBMCs via differential uptake mechanisms.
• No significant cytotoxic effects (necrosis or apoptosis) were observed.
• SVs exhibited low immunomodulatory properties, with minimal impact on PBMC activation markers and cytokine release.

Conclusions:

• The synthesized SVs demonstrate high immune biocompatibility.
• These polymer-based nanostructures possess low immunomodulating properties.
• The findings support the potential of SVs for safe translation into clinical biomedical applications.