PURPOSE: The significance of abnormal E-cadherin/ catenin complex expression and the correlation of each of its components in cancer remain unclear. This study aimed to characterize the clinical significance of the abnormal membrane expression of the E-cadherin/ catenin complex and the localization patterns of the beta- catenin and p120CTN in early gastric cancer. MATERIALS AND METHODS: Immunohistochemical staining for E-cadherin, alpha-, beta- and gamma-catenin and p120CTN were performed on 47 early gastric cancer specimens. The patterns of membrange expression of the E-cadherin/catenin complex, and the localization patterns of the beta-catenin and p120CTN, were semi quantitatively graded as loss, reduced, preserved or negative and positive. RESULTS: An abnormal immunoreactivity of at least one of E-cadherin/catenin complex proteins was noted in 46 (97.8%) of the 47 early gastric cancer cases. There were no significant correlations of the membrane E-cadherin/catenin expression with, either, sex, age, location, size, macroscopic type, depth of invasion or lymphovascular invasion. Abnormal expressions of membrane E-cadherin, beta-catenin and gamma-catenin were more frequent in the diffuse-type than in the intestinal type. No linear correlation was shown for the beta-catenin between the membrane and cytoplasmic expressions. Nuclear staining of the beta-catenin was observed in 5 (10.6%) cases, but nuclear staining of the p120CTN, a promotor of Kaiso transcriptional factor, was not seen. CONCLUSION: These results suggest that alterations of the E-cadherin/catenin complex may be involved in the early stages of gastric cancer. Although beta-catenin functions as a transcriptional factor, the inactivation of membrane E-cadherin does not appear to result in significant increases in the level of cytoplasmic beta-catenin. Kaiso transcriptional factor may not be involved in the early carcinogenesis of gastric cancer.
beta Catenin ; Cadherins ; Carcinogenesis ; Cell Adhesion ; Cytoplasm ; gamma Catenin* ; Membranes ; Stomach Neoplasms*

BACKGROUND AND OBJECTIVES: E-cadherin and catenins (alpha, beta, gamma, p120cat) are important epithelial adhesion molecules in normal epithelial cells. Loss of E-cadherin-catenin adhesion is an important step in the progression of epithelial cancers such as tongue cancer. E-cadherin and catenins expression in carcinoma of human tongue was evaluated in relation to their clinicopathological features and prognostic values. SUBJECTS AND METHOD: Thirty-nine specimens of tongue squamous cell carcinoma were examined in this study. These patients were all treated by primary surgery without prior radiotherapy or chemotherapy. The specimens of formalin-fixed and paraffin-embedded tumor tissues were investigated by immunohistochemical analysis using E-cadherin and catenin (alpha, beta, gamma, p120cat) monoclonal antibodies. RESULTS: The expressions of E-cadherin, alpha-catenin, beta-catenin, gamma-catenin and p120cat in cell membranes were reduced or absent in 71.8%, 74.4%, 76.9%, 59.0% and 82.1% of the tumors examined, respectively. The reduced expressions of alpha-catenin and gamma-catenin in the cell membranes was cor-related with tumore differentiation (p=0.018, p=0.004, respectively). There were significant correlations between E-cadherin and expressions of the four cantenins in the cell membranes of tongue cancer. There were no correlations between beta-catenin and p120cat expression in the cytoplasm, cell nucleus and clinicopathological features. There was significant correlation between E-cadherin expression and Kaplan-Meier survival curves. CONCLUSION: These results suggest that E-cadherin and catenins (alpha, beta, gamma, p120cat) can be used as prognostic markers of human tongue squamous cell carninoma. The result of beta-catenin and p120cat absence in the nucleus suggests that Wnt/Wingless signaling or Kaiso transcription did not occur in the human tongue squamous cell carcinoma.
alpha Catenin ; Antibodies, Monoclonal ; beta Catenin ; Cadherins* ; Carcinoma, Squamous Cell ; Catenins ; Cell Membrane ; Cell Nucleus ; Cytoplasm ; Drug Therapy ; Epithelial Cells ; gamma Catenin ; Humans ; Kaplan-Meier Estimate ; Prognosis ; Radiotherapy ; Tongue Neoplasms* ; Tongue*

During a search for keratinocyte differentiation-related genes, we obtained a cDNA fragment from the 5'-untranslated region of a previously identified splicing variant of desmoglein 3 (Dg3). This transcript encodes a protein of 282 amino acids, which corresponds to the N-terminal truncated intracellular domain of Dg3 (Delta NDg3). Northern blot analysis detected a 4.6-kb transcript matching the predicted size of Delta NDg3 mRNA, and Western blot analysis with an antibody raised against the Dg3 C-terminus (H-145) detected a 31-kDa protein. Increased Delta NDg3 expression was observed in differentiating keratinocytes by RT-PCR and Western blot analysis, suggesting that Delta NDg3 is indeed a differentiation-related gene product. In immunohistochemical studies of normal and pathologic tissues, H-145 antibody detected the protein in the cytoplasm of suprabasal layer cells, whereas an antibody directed against the N-terminal region of Dg3 (AF1720) reacted with a membrane protein in the basal layer. In addition, Delta NDg3 transcript and protein were upregulated in psoriatic epidermis, and protein expression appeared to increase in epidermal tumors including Bowen's disease and squamous cell carcinoma. Moreover, overexpression of Delta NDg3 led to increased migration and weakening of cell adhesion. These results suggest that Delta NDg3 have a role in keratinocyte differentiation, and that may be related with tumorigenesis of epithelial origin.
Cell Adhesion ; *Cell Differentiation ; Cell Movement ; Cells, Cultured ; Desmoglein 3/*genetics/*metabolism ; Epidermis/cytology ; Gene Expression ; Humans ; Keratinocytes/*cytology ; Skin Diseases/genetics/metabolism ; gamma Catenin/metabolism

OBJECTIVE: To investigate the differential expression of junctional proteins in the normal and preeclamptic human placenta and the effect of ginsenoside Rk1 in junctional proteins. METHODS: Placental tissues from 10 women with severe preeclampsia and 5 normal women were collected at the time of their cesarean section. Five of 10 preeclamptic women were complicated with intrauterine growth restriction (IUGR). Immunohistochemistry and Western blotting was employed to localize junctional proteins (zo-1, occludin and plakoglobin) positive cells. The placental explant culture was performed to investigate if Rk1 can attenuate the expression of junctional proteins (zo-1, occluding and plakoglobin) induced by deferoxamine-induced hypoxia. Rk1 was treated at the day 3 and Western blot analysis was performed for protein quantification. RESULTS: There was no different expression of zo-1 and plakoglobin among all the study groups. Occludin showed negative at the endothelial cells of the terminal villi in both normal and preeclampsia groups. At the endothelial cells of the stem villi, occludin was detected in both normal and severe preeclamptic placenta with normal fetal growth. However, severe preeclampsia with IUGR were decreased expression of occludin at the endothelial cells of the stem villi. When we administered Rk1 to the placenta treated with DFO, expression of occludin was not different. CONCLUSION: The placental expression of zo-1 and plakoglobin were not different among the study groups, while that of occludin was significantly decreased at the endothelium of stem villi in severe preeclampsia with IUGR. Rk-1 showed no effect on the placental junctional proteins. These results suggest that occludin may play a role in pathophysiology of fetal growth restriction in utero.
Anoxia ; Blotting, Western ; Cesarean Section ; Endothelial Cells ; Endothelium ; Female ; Fetal Development ; Fetal Growth Retardation ; gamma Catenin ; Ginsenosides ; Humans ; Immunohistochemistry ; Occludin ; Placenta ; Pre-Eclampsia ; Pregnancy ; Proteins

OBJECTIVES: E-cadherin is a transmembrane protein that is one of the key players involved in cell to cell adhesion. Loss of E-cadherin expression is suggested to promote tumor invasion and distant metastasis in tumor development. Recently, it has been proposed E-cadherin function requires its linkage to the cytoskeleton through catenins. So defects in catenins may cause defective E-cadherin function and promote tumor invasion. We intend to evaluate the expression of E-cadherin and alpha-, beta-, gamma- catenin in tissues of human endometrial carcinoma to analyze the patterns of cell adhesion molecules' expression in endometrial carcinoma and to investigate the relationship between status of cell adhesion molecules and various clinicopathological factors. MATERIALS AND METHODS: The present study investigated the immunohistochemical expression of E-cadherin and alpha-, beta-, gamma- catenin in 33 paraffin embedded formalin fixed tissues of endometrial carcinomas. RESULTS: Aberrant E-cadherin, alpha-, beta-, gamma- catenin expression was observed in 33.3(11 of 33), 27.3(9 of 33), 18.2 (6 of 33), and 51.5(17 of 33) % of the specimens, respectively. Statistically significant correlation was found between aberrant expression of E-cadherin and lymph node metastasis and cell types other than endometrioid adenocarcinoma. Aberrant pattern of gamma- catenin expression also correlated with deep myometrial invasion. But alpha-, beta- catenin expression were not correlated with any clinicopathological parameters. Using Kaplan-Meier curves, abnormal expression of E-cadherin correlated closely with poor survival (p<0.05). CONCLUSION: We revealed aberrant expression of these cell adhesion molecules in part of patients with endometrial carcinoma. Aberrant expression of E-cadherin was correlated with lymph node metastasis and cell types other than endometrioid adenocarcinoma and aberrant expression of gamma-catenin was related with deep myometrial invasion.
Cadherins* ; Carcinoma, Endometrioid ; Catenins* ; Cell Adhesion ; Cell Adhesion Molecules ; Cytoskeleton ; Endometrial Neoplasms* ; Female ; Formaldehyde ; gamma Catenin ; Humans ; Lymph Nodes ; Neoplasm Metastasis ; Paraffin

PURPOSE: Previously, we reported that the expression of E-cadherin was significantly decreased according to the increase of the level of hepatocyte growth factor (HGF) in gastric cancer tissue. In this work, the effect of HGF on the cell-cell adhesion and intracellular distribution of E-cadherin in the gastric carcinoma cell lines were studied. MATERIALS AND METHODS: Western blot analysis was performed to confirm the presence or abscence of c-Met and E-cadherin in SNU-1, 5, and 16 cells. Tyrosine phosphorylation of c-Met, E-cadherin, alpha-, beta-, gamma-catenins was checked by immunoprecipitation. The morphologic changes induced by HGF were studied with immunocytochemical staining. Functional proportion of E-cadherin was estimated by cell fractionation. The effect of HGF on cell proliferation and invasion was also assessed. RESULTS: Among SNU-1, 5, and 16 cell lines, only SNU-16 cells expressed both E-cadherin and c-Met. A morphological change from epithelial shape to fibroblastic one was observed in the SNU-16 cells after treatment with HGF. In addition, E-cadherin expression of the SNU-16 cells was shifted from the membrane and to the cytoplasm, and the functional fraction of E-cadherin was decreased in the SNU-16 cells treated with HGF. On the other hand, HGF increased the proliferation and invasion of the SNU-16 cells. CONCLUSION: These results suggest that HGF may regulate cell adhesion in gastric carcinomas via the cellular redistribution and functional change of E-cadherin.
Blotting, Western ; Cadherins* ; Cell Adhesion ; Cell Fractionation ; Cell Line* ; Cell Proliferation ; Cytoplasm ; Fibroblasts ; gamma Catenin ; Hand ; Hepatocyte Growth Factor* ; Hepatocytes* ; Immunoprecipitation ; Membranes ; Phosphorylation ; Stomach Neoplasms ; Tyrosine

Objective: To investigate the relationship between the expression levels of Plakoglobin protein in residual lesions after neoadjuvant chemotherapy (NAC) and the prognosis of breast cancer patients. Methods: Clinical and pathological data from 174 breast cancer patients who underwent surgery after receiving NAC at the Cancer Hospital of Chinese Academy of Medical Sciences from January 2009 to December 2017 were collected. The expression level of Plakoglobin in residual cancer lesions was evaluated by immunohistochemistry. The correlation between Plakoglobin expression level and clinicopathological features was analyzed. Survival analysis was performed using the Kaplan-Meier method, and Cox proportional hazard regression models were used for factor analysis. Results: Among the 174 patients, 140 had low expression of Plakoglobin, and 34 had high expression. The median disease-free survival (DFS) and overall survival (OS) in the Plakoglobin low expression group were 59.46 and 71.68 months, respectively, both of which were higher than those in the high expression group (36.58 and 47.26 months, respectively, both P<0.05). Univariate analysis showed that Plakoglobin expression, pathological N stage, lymphovascular invasion status, histological grade, Ki-67, and molecular subtypes were associated with OS (all P<0.05), while pathological N stage, histological grade, and Ki-67 were associated with DFS (all P<0.05). Multivariate analysis revealed that Plakoglobin expression (HR=2.438, 95% CI: 1.256-4.735, P=0.008) was an independent predictor for OS, and Ki-67 (HR=2.228, 95% CI: 1.316-3.773, P=0.003) was an independent predictor for DFS. Conclusion: In breast cancer patients with residual lesions after NAC, those with low Plakoglobin expression have relatively longer OS and Plakoglobin is an independent prognostic factor for OS.
Humans ; Female ; Prognosis ; Breast Neoplasms/surgery* ; Ki-67 Antigen/analysis* ; Neoadjuvant Therapy/methods* ; gamma Catenin ; Neoplasm, Residual ; Disease-Free Survival ; Retrospective Studies ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use*

Objective: To investigate the relationship between the expression levels of Plakoglobin protein in residual lesions after neoadjuvant chemotherapy (NAC) and the prognosis of breast cancer patients. Methods: Clinical and pathological data from 174 breast cancer patients who underwent surgery after receiving NAC at the Cancer Hospital of Chinese Academy of Medical Sciences from January 2009 to December 2017 were collected. The expression level of Plakoglobin in residual cancer lesions was evaluated by immunohistochemistry. The correlation between Plakoglobin expression level and clinicopathological features was analyzed. Survival analysis was performed using the Kaplan-Meier method, and Cox proportional hazard regression models were used for factor analysis. Results: Among the 174 patients, 140 had low expression of Plakoglobin, and 34 had high expression. The median disease-free survival (DFS) and overall survival (OS) in the Plakoglobin low expression group were 59.46 and 71.68 months, respectively, both of which were higher than those in the high expression group (36.58 and 47.26 months, respectively, both P<0.05). Univariate analysis showed that Plakoglobin expression, pathological N stage, lymphovascular invasion status, histological grade, Ki-67, and molecular subtypes were associated with OS (all P<0.05), while pathological N stage, histological grade, and Ki-67 were associated with DFS (all P<0.05). Multivariate analysis revealed that Plakoglobin expression (HR=2.438, 95% CI: 1.256-4.735, P=0.008) was an independent predictor for OS, and Ki-67 (HR=2.228, 95% CI: 1.316-3.773, P=0.003) was an independent predictor for DFS. Conclusion: In breast cancer patients with residual lesions after NAC, those with low Plakoglobin expression have relatively longer OS and Plakoglobin is an independent prognostic factor for OS.
Humans ; Female ; Prognosis ; Breast Neoplasms/surgery* ; Ki-67 Antigen/analysis* ; Neoadjuvant Therapy/methods* ; gamma Catenin ; Neoplasm, Residual ; Disease-Free Survival ; Retrospective Studies ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use*

BACKGROUND: Catenins are the associated protein with E-cadherin in the formation of adhesion complexes in normal and tumor cells related with epithelial differentiation and development of organ formation as well as in the tumor spread. The present study was aimed to find the distribution of alpha- and gamma-catenins in fetal skin development. OBJECTIVE: The purpose of this study was to observe the distribution of above two adhesion related proteins in the fetal skin during development, and to find its relationship by expression and their distribution pattern. METHODS: Skin was obtained from the scalp, chest, and sole of 21 human fetuses, ranging from 13 to 37 weeks of gestational age. Immunohistochemical staining was performed by the avidin biotin peroxidase complex method on paraffin embedded tissue using the anti-human monoclonal antibody against the human alpha- and gamma-catenins. RESULTS: alpha- and gamma-catenins were expressed strongly in basal cells of the epidermis and germ cells of skin adnexa, such as hair and eccrine glands at 13th week, followed by decreased basal cell expression. Increase in the suprabasal epithelium and differentiated adnexal epithelium, such as outer root sheath cells and eccrine ducts and glands at 18th week, and adult pattern in 23th week of gestation. Both showed similar distribution pattern in skin though gamma-catenin appeared two or three weeks later. alpha- and gamma-catenins are expressed not only in the epithelium of the skin, but also in the mesenchymal cells such as endothelial cells and fibroblasts. Though both catenins are more strongly expressed in the membrane portion, cytoplasmic expression is also noted. CONCLUSION: Both alpha- and gamma-catenin showed basically the same expression distribution pattern in the fetal skin developmental stage, suggesting that both adhesion molecules are highly related to each other in function and development of epidermis and adnexae of the skin in fetal stage.
Adult ; Avidin ; Biotin ; Cadherins ; Catenins ; Cytoplasm ; Eccrine Glands ; Endothelial Cells ; Epidermis ; Epithelium ; Fetus ; Fibroblasts ; gamma Catenin* ; Germ Cells ; Gestational Age ; Hair ; Humans ; Membranes ; Paraffin ; Peroxidase ; Pregnancy ; Scalp ; Skin* ; Thorax

OBJECTIVES: Cadherin/catenin adhesion complex is fundamentally involved in epithelial cancer invasion and metastasis. E-cadherin and EGFR colocalize on the basolateral membrane of epithelial cell and EGF down-regulate E-cadherin expression. In the invasion and metastasis of cancer, E-cadherin expression is decreased and growth factors receptor is overexpressed. The present study was aimed to find the role of E-cadherin, beta-and gamma-catenin, growth factors and its receptors in cervical cancer cell lines. METHODS: The cervical cancer cell cultures were treated with different time duration of EGF 30 ng/ml and TGF-a 10 ng/ml(0, 10 min, 20 min, 30 min, 1 hr, 2 hr, 4 hr, 8 hr, 24 hr). The change in cancer cell morphology and the changes in E-cadherin, beta- and gamma-catenin, EGFR and activated EGFR expression were studied with a western blot analysis and an immunoprecipitation. RESULTS: Through a western blot analysis, E-cadherin 120 kDa band and EGFR 170 kDa band were expressed in CaSki, HT-3 and ME-180 cell line, which showed epithelial contact growth. 1n these 3 cell lines, expression of E-cadherin did not decrease with time dependent manner. after the treatment of EGF and TGF- alpha. The expression of EGFR decreased and activated EGFR expression increased in 30 minutes to 1 hour but decreased subsequently. When the cells treated with EGF, there were no change in beta-and gamma-catenin expression with there dependent manner. The tyrosine phosphorylation of beta-and gamma-catenin increased in 30 minutes to 1 hour but decreased subsequently with activated EGFR. CONCLUSION: This study showed that an activated EGFR which has involved with tyrosine phosphorylation of beta- and gamma-catenin influenced by growth factors rather than expression of E-cadherin, has a role in the invasion and metastasis of the cervical cancer.
Blotting, Western ; Cadherins* ; Cell Culture Techniques ; Cell Line* ; Epidermal Growth Factor* ; Epithelial Cells ; gamma Catenin* ; Immunoprecipitation ; Intercellular Signaling Peptides and Proteins ; Membranes ; Neoplasm Metastasis ; Phosphorylation* ; Transforming Growth Factor alpha* ; Tyrosine* ; Uterine Cervical Neoplasms*