title: High expression and prognostic role of CAP1 and CtBP2 in breast carcinoma: associated with E-cadherin and cell proliferation.
abstract: Overexpression of C-terminal binding protein-2 (CtBP2) has been noted to correlate with cancer metastasis in several human cancers including breast cancer. The aim of this study was to examine the effect of cyclase-associated protein 1 (CAP1) overexpression on CtBP2 expression and related mechanism in the metastasis of breast cancer. Immunohistochemical analysis was performed in 100 human breast carcinoma samples, and the data were correlated with clinicopathologic features. Furthermore, Western blot analysis was performed for CAP1 and CtBP2 in breast carcinoma samples and cell lines to evaluate their protein levels and molecular interaction. We found that the expression of CAP1 was positively related to CtBP2 expression (P<0.01); moreover, CAP1 expression was significantly correlated with histologic grade (P<0.01) and negatively related to E-cadherin expression (P<0.01). Meanwhile, CtBP2 expression obtained similar results. Kaplan-Meier survival analysis showed that overexpression of CAP1 and CtBP2 exhibited a significant correlation with poor prognosis in human breast cancer (P<0.01). While in vitro, we employed siRNA technique to knockdown CAP1 and CtBP2 expressions and observed their effects on MDA-MB-231 cells growth. CtBP2 depletion by siRNA-inhibited cell proliferation, resulted in increased E-cadherin levels. Moreover, knockdown of CAP1 resulted in decreased CtBP2 and increased E-cadherin expression. On the basis of these results, we suggested that CAP1's oncogenic abilities appear to be triggered at least in part by the modulation of CtBP2 and E-cadherin, which might serve as a future target for breast cancer.
authors: Department of Radiation Therapy, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu Province, People's Republic of China.
authors: Xiancheng
authors: X
authors: Liu
authors: Ninghua
authors: N
authors: Yao
authors: Jing
authors: J
authors: Qian
authors: Huiwei
authors: H
authors: Huang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000429:Alcohol Oxidoreductases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D015820:Cadherins / Q000235:genetics / Q000378:metabolism*; D018270:Carcinoma, Ductal, Breast / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D018797:Cell Cycle Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D049109:Cell Proliferation; D056970:Co-Repressor Proteins; D003598:Cytoskeletal Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D005260:Female; D005500:Follow-Up Studies; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D060787:Neoplasm Grading; D009361:Neoplasm Invasiveness; D009419:Nerve Tissue Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D011379:Prognosis; D012333:RNA, Messenger / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015996:Survival Rate
chemical_list: D014408:Biomarkers, Tumor; C489549:CAP1 protein, human; D015820:Cadherins; D018797:Cell Cycle Proteins; D056970:Co-Repressor Proteins; D003598:Cytoskeletal Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D000429:Alcohol Oxidoreductases; C421248:CTBP2 protein, human