title: Serpin B5 is a CEA-interacting biomarker for colorectal cancer.
abstract: Serpin B5 is a candidate tumour suppressor, but its oncogenic activity has also been reported. Its function may be affected by protein interactions. The aim of this study was to assess the relationship between serpin B5 and carcinoembryonic antigen (CEA) expression in colorectal cancer (CRC). We also analysed the clinicopathological significance of serpin B5 expression in patients with CRC. Downregulation of serpin B5 was identified in a CEA-suppressed LoVo cell line using two-dimensional gel electrophoresis (2-DE) and matrix-associated laser desorption ionisation-mass spectrometry (MALDI-MS). The specific interaction and co-localisation of serpin B5 with CEA were confirmed by co-immunoprecipitation and confocal microscopy. Western blot analysis and ELISAs revealed significant positive correlations between levels of serpin B5 and CEA in human colon cancer cell lines and in the blood of patients with CRC. Tissue expression of serpin B5 in 377 patients with CRC was significantly associated with serum CEA, histological grade, stage, lymph node metastasis, lymphatic and perineural invasion, and infiltrative border. Strong expression of serpin B5 was also associated with a reduced DFS (p = 0.001) and OS (p = 0.017). Together, these findings describe a relationship between serpin B5 and CEA expression in CRC. Strong expression of serpin B5 was associated with a worse prognosis in patients with CRC and its expression may correlate with CEA levels in CRC.
authors.affiliation: Center for Colorectal Cancer, National Cancer Center, Goyang, Republic of Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Baek
authors.forename: Hyun Yang
authors.initials: HY
authors.lastname: Yeo
authors.forename: Hee Jin
authors.initials: HJ
authors.lastname: Chang
authors.forename: Kyung-Hee
authors.initials: KH
authors.lastname: Kim
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Ji Won
authors.initials: JW
authors.lastname: Park
authors.forename: Sung Chan
authors.initials: SC
authors.lastname: Park
authors.forename: Hyo Seong
authors.initials: HS
authors.lastname: Choi
authors.forename: Dae Yong
authors.initials: DY
authors.lastname: Kim
authors.forename: Jae Hwan
authors.initials: JH
authors.lastname: Oh
mesh_terms: D014408:Biomarkers, Tumor / Q000096:biosynthesis / Q000097:blood* / Q000235:genetics; D018938:Caco-2 Cells; D002272:Carcinoembryonic Antigen / Q000097:blood* / Q000235:genetics; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000097:blood* / Q000235:genetics / Q000473:pathology; D015536:Down-Regulation; D045325:HCT116 Cells; D006801:Humans; D008207:Lymphatic Metastasis; D011379:Prognosis; D015843:Serpins / Q000096:biosynthesis / Q000097:blood* / Q000235:genetics
chemical_list: D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; C085344:SERPIN-B5; D015843:Serpins
keywords: Serpin B5; carcinoembryonic antigen (CEA); colorectal cancer; maspin; prognostic factor