Serpin A3N

Serpin A3N is a mouse serpin encoded within the expanded Serpina3 gene cluster on mouse chromosome 12, the counterpart of the human SERPINA1/SERPINA3 locus on chromosome 14. Like its cluster relatives, it is a secreted glycoprotein with the canonical serpin fold, and its expression in lung, liver, and myeloid cells is strongly induced by lipopolysaccharide, allergen challenge, and tissue injury, pointing to a protective role in limiting extracellular proteolysis during inflammation. The cluster paralogs are so similar that gene-specific recombinant Serpin A3N is needed to resolve individual contributions in knockout, antibody, and biomarker studies of mouse inflammatory disease models.