| Summary: | 碩士 === 國立中山大學 === 生物科學系研究所 === 98 === Abstract
C1 inhibitor (C1 INH) is a member of the serine protease inhibitor (serpin) superfamily. It is the only physiological inhibitor of protease C1r and C1s in the complement system. C1 INH is a single chain glycoprotein with apparent molecular weight of 105 KDa, consisting of 478 amino acids. C1 INH N-terminal domain includes first 98 amino acids with 10 definite and 7 potential glycosylation site. Various of carbohydrates are present on the cell surface and component of ECM (extracellular matrix) in every eukaryotic cell, including both cancer cells and cells that are important for tumour survival. Carbohydrates on the cancer cell surface have been shown to be important in many aspects of cancer cell physiological processes, involved in cell growth and cell adhesion. Carbohydrates are also able to bind and interact with growth factors and other proteins that trigger signal transduction. Interfere carbohydrates maybe offer a useful therapeutic approach for treating cancers. In order to understand whether the C1 INH NT98 polypeptides can influences cancer or not, we amplified a DNA fragment encoding C1 INH N-terminal domain 98 residues (C1 INH NT98) by PCR assay, and transfer to the plasmid pGEX-2T, than use E.coli (BL21 strain) to express the non-glycosylated polypeptides, and further analyze the influence of the effective roles exhibited by the polypeptides non-glycosylated on breast cancer cell MDA-MB-435s. Proliferation and migration assays in our experiment showed that non-glycosylated C1 INH NT98 can inhibited breast cancer cell growth and migration, and the mechanism needed to be clarified clearly through extensive research.
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