hst 1196

SERPINB3, also known as SCCA-1, belongs to the serpin family. Serpins are a group of proteins with similar structures that were first identified as a set of proteins able to inhibit proteases. The acronym serpin was originally coined because many serpins inhibit chymotrypsin-like serine proteases. SERPINB3 is expressed in some hepatocellular carcinoma (at protein level). Its expression is closely related to cellular differentiation in both normal and malignant squamous cells. It seems to also be secreted in plasma by cancerous cells but at a low level. SERPINB3 significantly attenuates apoptosis by contrasting cytochrome c release from the mitochondria and by antichemotactic effect for NK cells. It may act as a protease inhibitor to modulate the host immune response against tumor cells and may be involved in the malignant behavior of squamous cell carcinoma cells.

Overexpression of SERPINB4 in tumor cells inhibited recombinant GrM-induced as well as NK cell-mediated cell death and this inhibition depended on the reactive center loop of the serpin.

Serpin B3 Protein, Human, Recombinant (C-His) is expressed in HEK293 mammalian cells with C-6xHis tag. The predicted molecular weight is 41-50 KDa and the accession number is P29508.

Serpin B3 Protein, Human, Recombinant (N-His) is expressed in E. coli expression system with N-6xHis tag. The predicted molecular weight is 40-55 KDa and the accession number is P29508.