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Application of  α -gal nanoparticles to wounds and burns induces accelerated healing by harnessing the natural anti-Gal antibody which constitutes ~1% of human immunoglobulins.  α -gal nanoparticles present multiple  α -gal epitopes (Gal α 1-3Gal β 1-4GlcNAc-R), the carbohydrate ligand of anti-Gal. Studied  α -gal nanoparticles were comprised of glycolipids with  α -gal epitopes, phospholipids, and cholesterol. Binding of anti-Gal to  α -gal nanoparticles in wounds activates the complement cascade, resulting in formation of chemotactic complement cleavage peptides that induce rapid recruitment of many macrophages. The Fc/Fc γ  receptors interaction between anti-Gal coating  α -gal nanoparticles and the recruited macrophages activates macrophages to produce cytokines/growth factors that promote wound healing and recruit stem cells. Studies of wound healing by  α -gal nanoparticles were feasible in  α 1,3galactosyltransferase knockout mice and pigs. In contrast to other nonprimate mammals, these mice and pigs lack the  α -gal epitope, and thus they are not immunotolerant to it and produce anti-Gal. Treatment of skin wounds and burns with  α -gal nanoparticles resulted in 40–60% decrease in healing time in comparison with control wounds treated with saline. This accelerated healing is associated with increased recruitment of macrophages and extensive angiogenesis in wounds, faster regrowth of epidermis, and regeneration of the dermis. The accelerated healing further decreases and may completely eliminate fibrosis and scar formation in wounds. Since healing of internal injuries is mediated by mechanisms similar to those in external wound healing, it is suggested that  α -gal nanoparticles treatment may also improve regeneration and restoration of biological function following internal injuries such as surgical incisions, myocardial ischemia following infarction, and nerve injuries.

journal of immunology research

Acceleration of Wound Healing by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mo mathvariant="bold">α</mml:mo></mml:mrow></mml:math>-gal Nanoparticles Interacting with the Natural Anti-Gal Antibody

Acceleration of Wound Healing byα-gal Nanoparticles Interacting with the Natural Anti-Gal Antibody