Ultradeformable archaeosomes as new topical adjuvants.

Area of Science:

• * Biomaterials science
• * Nanotechnology
• * Immunology

Background:

• * Development of ultradeformable archaeosomes (UDA) for transdermal delivery.
• * Comparison of UDA with ultradeformable liposomes (UDL) for skin penetration and immune response.

Purpose of the Study:

• * To evaluate the efficacy of UDA as a transdermal delivery vehicle.
• * To compare the skin penetration, cellular uptake, and immunogenicity of UDA and UDL.

Main Methods:

• * Characterization of UDA and UDL properties (size, zeta potential).
• * In vitro cytotoxicity assays on keratinocytes and macrophages.
• * In vivo topical immunization studies in Balb/C mice using ovalbumin (OVA) as a model antigen.
• * Skin penetration studies using excised human skin.

Main Results:

• * UDA and UDL showed no cytotoxicity on keratinocytes.
• * UDA was avidly captured by macrophages, while UDL were poorly captured.
• * Topical immunization with OVA-loaded UDA induced significantly higher IgG titers compared to OVA-loaded UDL.
• * Both UDA and UDL penetrated to a similar depth in excised human skin (approx. 10 μm).

Conclusions:

• * UDA demonstrates superior topical adjuvancy and phagocytic uptake compared to UDL, attributed to its glycolipid content.
• * UDA is a promising nanocarrier for transdermal delivery systems, enhancing skin penetration and immune responses.
• * The glycolipid component of UDA plays a crucial role in its enhanced performance.