Astrocyte elevated gene-1 interacts with ß-catenin and increases migration and invasion of colorectal carcinoma.

To investigate the astrocyte elevated gene-1 (AEG-1) expression and its relationship with the clinicopathological features of colorectal carcinoma (CRC) and ß-catenin signaling pathway. Real-time PCR, Western blot, immunohistochemistry, and immunofluorescence staining were performed to detect AEG-1 expression in CRC cell lines, 8 pairs of fresh CRC and adjacent nontumor tissues (ANT), 120 pairs of paraffin-embedded CRC specimens and ANT tissues, and 60 samples of lymph node metastatic CRC tissues. Scratch wound assay and transwell matrix penetration assay were performed to determine migration and invasion of SW480 cell lines with stable AEG-1 overexpression or SW620 cell lines with AEG-1 knockdown. AEG-1 expression was upregulated in CRC cell lines and tissues compared with ANT. Furthermore, AEG-1 expression level significantly correlated with UICC stage, and the N classification. AEG-1 overexpression significantly enhanced migration and invasion of SW480 cell lines. However, AEG-1 knockdown suppressed migration and invasion of SW620 cell lines. Meanwhile, there was a positive correlation between AEG-1 high expression and ß-catenin nuclear expression in CRC. AEG-1 overexpression increased nuclear ß-catenin accumulation in CRC cell lines. AEG-1 knockdown decreased nuclear ß-catenin accumulation in CRC cell lines. Moreover, we firstly found that AEG-1 interacted with ß-catenin in SW480 cell lines. Our results for the first time showed that AEG-1 interacted with ß-catenin in CRC cells and AEG-1 expression was closely associated with progression of CRC. AEG-1 might be a potential therapeutic target in CRC.

An accurate prediction of the origin for bone metastatic cancer using deep learning on digital pathological images.

BACKGROUND: Determining the origin of bone metastatic cancer (OBMC) is of great significance to clinical therapeutics. It is challenging for pathologists to determine the OBMC with limited clinical information and bone biopsy. METHODS: We designed a regional multiple-instance learning algorithm to predict the OBMC based on hematoxylin-eosin (H&E) staining slides alone. We collected 1041 cases from eight different hospitals and labeled 26,431 regions of interest to train the model. The performance of the model was assessed by ten-fold cross validation and external validation. Under the guidance of top3 predictions, we conducted an IHC test on 175 cases of unknown origins to compare the consistency of the results predicted by the model and indicated by the IHC markers. We also applied the model to identify whether there was tumor or not in a region, as well as distinguishing squamous cell carcinoma, adenocarcinoma, and neuroendocrine tumor. FINDINGS: In the within-cohort, our model achieved a top1-accuracy of 91.35% and a top3-accuracy of 97.75%. In the external cohort, our model displayed a good generalizability with a top3-accuracy of 97.44%. The top1 consistency between the results of the model and the immunohistochemistry markers was 83.90% and the top3 consistency was 94.33%. The model obtained an accuracy of 98.98% to identify whether there was tumor or not and an accuracy of 93.85% to differentiate three types of cancers. INTERPRETATION: Our model demonstrated good performance to predict the OBMC from routine histology and had great potential for assisting pathologists with determining the OBMC accurately. FUNDING: National Science Foundation of China (61875102 and 61975089), Natural Science Foundation of Guangdong province (2021A15-15012379 and 2022A1515 012550), Science and Technology Research Program of Shenzhen City (JCYJ20200109110606054 and WDZC20200821141349001), and Tsinghua University Spring Breeze Fund (2020Z99CFZ023).

EBV-encoded LMP1 increases nuclear ß-catenin accumulation and its transcriptional activity in nasopharyngeal carcinoma.

This paper aimed to study whether Epstein-Barr virus-encoded latent membrane protein 1 (LMP1) regulates ß-catenin signaling pathway in nasopharyngeal carcinoma (NPC). Western blotting, immunofluorescence, luciferase reporter assay, co-immunoprecipitation assay, and immunohistochemistry staining were used. LMP1 increased ß-catenin transcriptional activity in NPC cell lines. The upregulation of ß-catenin transcriptional activity induced by LMP1 was much higher in poorly differentiated NPC cell line CNE2 than that in well-differentiated NPC cell line CNE1. Immunofluorescence staining and Western blotting also showed that LMP1 increased nuclear ß-catenin accumulation in NPC cell lines. Moreover, LMP1 expression was closely related to abnormal ß-catenin expression in NPC tissues by immunohistochemistry. LMP1 may be involved in nasopharyngeal carcinogenesis via ß-catenin signaling pathway.

MACC1 down-regulation inhibits proliferation and tumourigenicity of nasopharyngeal carcinoma cells through Akt/ß-catenin signaling pathway.

The present study was aimed at investigating the expression of metastasis-associated in colon cancer 1 (MACC1) in nasopharyngeal carcinoma (NPC), its relationship with ß-catenin, Met expression and the clinicopathological features of NPC, and its roles in carcinogenesis of NPC. Our results showed that MACC1 expression was higher in NPC cells and tissues than that in normal nasopharyngeal cells and chronic inflammation of the nasopharynx tissues, respectively. MACC1 expression was closely related to the clinical stage (p = 0.005) and the N classification (p<0.05) of NPC. Significant correlations between MACC1 expression and Met expression (p = 0.003), MACC1 expression and ß-catenin abnormal expression (p = 0.033) were found in NPC tissues. MACC1 knockdown dramatically inhibited cellular proliferation, migration, invasion, and colony formation, but induced apoptosis in NPC cells compared with the control group. Furthermore, MACC1 down-regulation inhibited phosphorylated-Akt (Ser473) and ß-catenin expression in NPC cells, but phosphorylated-Erk1/2 expression was not altered. Further study showed that phosphotidylinsitol-3-kinase inhibitor downregulated ß-catenin and Met expression in NPC cells. There was a significant relationship between MACC1 expression and phosphorylated-Akt expression (p = 0.03), ß-catenin abnormal expression and phosphorylated-Akt expression (p = 0.012) in NPC tissue, respectively. In addition, Epstein Barr virus-encoded oncogene latent membrane protein 1 upregulated MACC1 expression in NPC cells. Our results firstly suggest that MACC1 plays an important role in carcinogenesis of NPC through Akt/ß-catenin signaling pathway. Targeting MACC1 may be a novel therapeutic strategy for NPC.

Suppression of nasopharyngeal carcinoma cell by targeting ß-catenin signaling pathway.

AIM: To investigate the role of ß-catenin in pathogenesis of nasopharyngeal carcinoma (NPC). METHODS: Cellular proliferation, apoptosis, matrix penetration assay, and western blotting were employed to determine cell biological changes in NPC cell lines transfected with ß-catenin siRNA. Immunohistochemistry staining was used to detect ß-catenin and Ki-67 expression in NPC tissue. RESULTS: ß-Catenin was upregulated in NPC cell lines and tissues compared with chronic nasopharyngitis tissue. ß-Catenin knockdown dramatically inhibited cellular growth, migration and invasion, but induced apoptosis of NPC cells. Further study showed that downstream genes of ß-catenin signaling pathway including cyclin D1, c-Myc, MMP2 and MMP9 expression were suppressed in NPC cell lines transfected with ß-catenin siRNA. CONCLUSION: Targeting ß-catenin signaling pathway may be a noval strategy for NPC therapy.

Suppression of retinoid X receptor alpha and aberrant ß-catenin expression significantly associates with progression of colorectal carcinoma.

To investigate retinoid X receptor alpha (RXRα) and ß-catenin expression and their relationship with the clinicopathological features of colorectal carcinoma (CRC). Real-time PCR and western blot analyses revealed that ß-catenin and RXRα expression at both mRNA and protein levels in four pairs of fresh CRC and adjacent non-tumour tissues (ANT) dramatically was increased and decreased in CRC compared with ANT, respectively. Furthermore, RXRα expression at both mRNA and protein levels was downregulated in higher histological grade CRC. Immunohistochemistry staining in 120 cases of CRC and 60 cases of lymph node metastatic carcinoma of CRC showed that RXRα expression was significantly suppressed in CRC compared with ANT (P<0.001) and low expression of RXRα in CRC was significantly associated with histological grade (P<0.001), TNM stage (P=0.022) and N classification (P=0.002). The aberrant (accumulated cytoplasm or/and nuclei) expression of ß-catenin was higher in CRC than that in ANT (P<0.001) and associated with histological grade (P=0.001) and N classification (P=0.002). Moreover, there was a close relationship between low RXRα expression and aberrant ß-catenin expression in CRC (P=0.032). Taken together with our previous study, aberrant ß-catenin expression upregulated by suppression of RXRα may play a crucial role in pathogenesis and progression of CRC.