Silencing circ_0000644 inhibits papillary thyroid cancer cell malignancy by combining with miR-671-5p to release the inhibition on ANXA2.

BACKGROUND: Papillary thyroid cancer (PTC) is life-threatening due to its malignant progression. Considerable evidence demonstrates that circular RNA (circRNA) regulates PTC development. This study aims to explore the mechanism of circ_0000644 modulating PTC malignant progression. METHODS: The RNA levels of circ_0000644, microRNA-671-5p (miR-671-5p) and annexin A2 (ANXA2) were detected by quantitative real-time polymerase chain reaction. Western blot was performed to check protein expression. Cell proliferation and cell apoptosis were investigated by 5-ethynyl-29-deoxyuridine and flow cytometry. Angiogenic capacity, migration and invasion were analyzed by tube formation assay and transwell assay. The interaction between miR-671-5p and circ_0000644 or ANXA2 was identified by dual-luciferase reporter assay. Xenograft mouse model assay was performed to analyze the effect of circ_0000644 on tumor formation in vivo. RESULTS: Circ_0000644 and ANXA2 expression was significantly upregulated, while miR-671-5p was downregulated in PTC tissues and cells when compared with control groups. Circ_0000644 knockdown inhibited PTC cell proliferation, tube formation, migration, and invasion, but induced apoptosis in vitro. Moreover, circ_0000644 knockdown led to delayed tumorigenesis in vivo. In addition, circ_0000644 acted as a miR-671-5p sponge and mediated PTC cell tumor properties through miR-671-5p. ANXA2 was identified as a target gene of miR-671-5p, and its overexpression relieved miR-671-5p-induced effects in PTC cells. Furthermore, circ_0000644 depletion inhibited ANXA2 production by combining with miR-671-5p. CONCLUSION: Circ_0000644 depletion repressed PTC cell tumor properties through the miR-671-5p/ANXA2 axis.

MTUS1 is a promising diagnostic and prognostic biomarker for colorectal cancer.

BACKGROUND: The morbidity and mortality of colorectal cancer (CRC) remain high, posing a serious threat to human life and health. The early diagnosis and prognostic evaluation of CRC are two major challenges in clinical practice. MTUS1 is considered a tumour suppressor and can play an important role in inhibiting cell proliferation, migration, and tumour growth. Moreover, the expression of MTUS1 is decreased in different human cancers, including CRC. However, the biological functions and molecular mechanisms of MTUS1 in CRC remain unclear. METHODS: In the present study, data from The Cancer Genome Atlas (TCGA) database were analysed using R statistical software (version 3.6.3.) to evaluate the expression of MTUS1 in tumour tissues and adjacent normal tissues using public databases such as the TIMER and Oncomine databases. Then, 38 clinical samples were collected, and qPCR was performed to verify MTUS1 expression. We also investigated the relationship between MTUS1 expression and clinicopathological characteristics and elucidated the diagnostic and prognostic value of MTUS1 in CRC. In addition, the correlation between MTUS1 expression and immune infiltration levels was identified using the TIMER and GEPIA databases. Furthermore, we constructed and analysed a PPI network and coexpression modules of MTUS1 to explore its molecular functions and mechanisms. RESULTS: CRC tissues exhibited lower levels of MTUS1 than normal tissues. The logistic regression analysis indicated that the expression of MTUS1 was associated with N stage, TNM stage, and neoplasm type. Moreover, CRC patients with low MTUS1 expression had poor overall survival (OS). Multivariate analysis revealed that the downregulation of MTUS1 was an independent prognostic factor and was correlated with poor OS in CRC patients. MTUS1 expression had good diagnostic value based on ROC analysis. Furthermore, we identified a group of potential MTUS1-interacting proteins and coexpressed genes. GO and KEGG enrichment analyses showed that MTUS1 was involved in multiple cancer-related signalling pathways. Moreover, the expression of MTUS1 was significantly related to the infiltration levels of multiple cells. Finally, MTUS1 expression was strongly correlated with various immune marker sets. CONCLUSIONS: Our results indicated that MTUS1 is a promising biomarker for predicting the diagnosis and prognosis of CRC patients. MTUS1 can also become a new molecular target for tumour immunotherapy.

The Impact of Cysteine-Rich Intestinal Protein 1 (CRIP1) on Thyroid Carcinoma.

BACKGROUND/AIMS: CRIP1 (cysteine-rich intestinal protein 1) has been found in several tumor types; however, its prognostic impact and role in cellular processes, particularly in thyroid carcinoma, are still unclear. METHODS: To elucidate the prognostic impact of CRIP1, we analyzed tissues from 58 primary invasive thyroid carcinomas using immunohistochemistry. Western blotting was performed to investigate CRIP1 protein expression in the thyrocyte cell line Nthy-ori 3-1 and four different thyroid carcinoma cell lines, K1, TPC-1, TT, and SW579. Endogenous expression of CRIP1 was suppressed using a siRNA (si-CRIP1). The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay was used to investigate cell viability. Flow cytometric analysis was used to detect cell cycle progression and cell apoptosis. The effects of silencing CRIP1 on cell migration and invasion were detected using the transwell assay. RESULTS: The immunohistochemistry results showed that CRIP1 was overexpressed in thyroid carcinoma. CRIP1 expression was associated with tumor size, TNM stage, and lymphatic metastasis, but not with age, gender, and tumor location. In addition, the expression of CRIP1 in K1, TPC-1, TT, and SW529 cells was higher than that in the Nthy-ori 3-1 cells. The highest expression was observed in the SW579 and TT cells. Furthermore, silencing CRIP1 inhibited the proliferation, migration, and invasion of thyroid carcinoma cell lines SW579 and TT. We also found that silencing CRIP1 induced G1 arrest and apoptosis of thyroid carcinoma cell lines SW579 and TT. CONCLUSION: In conclusion, CRIP1 acts as an oncogene in the cell proliferation, migration, and invasion processes of thyroid carcinoma. CRIP1 may serve well as an independent prognostic marker with significant predictive power for use in thyroid carcinoma therapy.

Combinational study with network pharmacology, molecular docking and preliminary experiments on exploring common mechanisms underlying the effects of weijing decoction on various pulmonary diseases.

Objective: 'Homotherapy for heteropathy' is a theory by which different diseases with similar pathogenesis can be treated with one Chinese formula. We aimed to explore the key components and core targets of Weijing decoction (WJD) in treating various lung diseases, namely, pneumonia, chronic obstructive pulmonary disease (COPD), acute lung injury (ALI), pulmonary fibrosis, pulmonary tuberculosis and non-small cell lung cancer (NSCLC), via network pharmacology, molecular docking and some experiments. Significance: This is the first study on the mechanism of WJD in treating various lung diseases by 'homotherapy for heteropathy'. This study is helpful for the transformation of TCM formula and development of new drugs. Methods: Active components and therapeutic targets of WJD were obtained via TCMSP and UniProt databases. Targets of the six pulmonary diseases were harvested from the GeneCards TTD, DisGeNet, UniProt and OMIM databases. Drug-disease intersection targets, corresponding Venn diagrams, herb-component-target networks and protein-protein interaction networks were established. Furthermore, GO biological function and KEGG enrichment analysis were completed. Moreover, the binding activity between main compounds and core targets was measured through molecular docking. Finally, the xenograft NSCLC mouse model was established. Immune responses were evaluated by flow cytometry and mRNA expression levels of critical targets were measured by real-time PCR. Results: JUN, CASP3 and PTGS2 were the most critical targets in six pulmonary diseases. The active compounds beta-sitosterol, tricin and stigmasterol stably bound to many active sites on target proteins. WJD had extensive pharmacological regulation, involving pathways related to cancer, inflammation, infection, hypoxia, immunity and so on. Conclusions: Effects of WJD against various lung diseases involve lots of compounds, targets and pathways. These findings will facilitate further research as well as clinical application of WJD.

Network Pharmacology-Based Exploration on the Intervention of Qinghao Biejia Decoction on the Inflammation-Carcinoma Transformation Process of Chronic Liver Disease via MAPK and PI3k/AKT Pathway.

Chronic liver disease(CLD) is a slow-developing and long-term disease that can cause serious damage to the liver. Thus far, it has been associated with viral hepatitis, non-alcoholic fatty liver disease(NAFLD), alcoholic liver disease(ALD), hepatic fibrosis(HF), liver cirrhosis (LC), and liver cancer. Qinghao Biejia Decoction (QBD) is a classic ancient Chinese herbal prescription with strong immune-enhancing, anti-inflammatory, and anti-tumor effects. In this study, we used a network pharmacology approach to investigate the molecular mechanisms of QBD in the inflammation-carcinoma transformation process of chronic liver disease. Two key drug targets, MAPK1 and PIK3CA, were screened using network pharmacology and molecular docking techniques, revealing dihydroartemisinin, artesunate, 12-O-Nicotinoylisolineolone, caffeic acid, and diincarvilone A as active ingredients involved in QBD mechanisms. The main signaling pathways involved were the PI3K-AKT signaling pathway and MAPK signaling pathway. In summary, our results indicated that QBD affects the inflammatory transformation of chronic liver disease through MAPK1 and PIK3CA and signaling pathways MAPK and PI3K/AKT. These data provide research direction for investigating the mechanisms underlying the inflammation-carcinoma transformation process in QBD for chronic liver disease.

NVD-BM-mediated genetic biosensor triggers accumulation of 7-dehydrocholesterol and inhibits melanoma via Akt1/NF-ĸB signaling.

Aberrant activation of the cholesterol biosynthesis supports tumor cell growth. In recent years, significant progress has been made by targeting rate-limiting enzymes in cholesterol biosynthesis pathways to prevent carcinogenesis. However, precise mechanisms behind cholesterol degradation in cancer cells have not been comprehensively investigated. Here, we report that codon optimization of the orthologous cholesterol 7-desaturase, NVD-BM from Bombyx mori, significantly slowed melanoma cell proliferation and migration, and inhibited cancer cell engraftment in nude mice, by converting cholesterol to toxic 7-dehydrocholesterol. Based on these observations, we established a synthetic genetic circuit to induce melanoma cell regression by sensing tumor specific signals in melanoma cells. The dual-input signals, RELA proto-oncogene (RELA) and signal transducer and activator of transcription 1 (STAT1), activated NVD-BM expression and repressed melanoma cell proliferation and migration. Mechanically, we observed that NVD-BM decreased Akt1-ser473 phosphorylation and inhibited cytoplasmic RELA translocation. Taken together, NVD-BM was identified as a tumor suppressor in malignant melanoma, and we established a dual-input biosensor to promote cancer cell regression, via Akt1/NF-κB signaling. Our results demonstrate the potential therapeutic effects of cholesterol 7-desaturase in melanoma metabolism, and provides insights for genetic circuits targeting 7-dehydrocholesterol accumulation in tumors.

Inhibitory effect of Sophora subprosrate polysaccharide on mitochondria oxidative stress induced by PCV-2 infection in RAW264.7 cells.

In the present study, the inhibitory effect of Sophora subprosrate polysaccharide (SSP) on PCV-2-induced mitochondrial respiratory burst in RAW264.7 cells was first investigated. The findings suggested that SOD activity and the anti-superoxide anion radical activity of the RAW264.7 cells were significantly decreased after PCV-2 infection, and MnSOD mRNA levels were significantly decreased, while NOX2 mRNA levels and protein expression were increased. Meanwhile, the O2•- levels and mitochondrial membrane potentials were significantly increased. After treatment with SSP, significant increases in the activities of SOD, anti-superoxide anion radical activities, and MnSOD mRNA levels in the PCV-2 infected cells were observed. Meanwhile, significant increases in NOX2 mRNA levels and protein expression, O2•- levels and mitochondrial membrane potentials were also observed. The results showed that PCV2 infection resulted in the mitochondria oxidative stress of RAW264.7 cells as indicated by an increasing mitochondrial membrane potential, which was then inhibited by SSP. It was concluded that RAW264.7 cells treated with SSP could suffer from mitochondrial damage, which may be mediated by the inhibition of the mitochondrial membrane potential.

Effect of Sophora subprosrate polysaccharide on oxidative stress induced by PCV2 infection in RAW264.7 cells.

In this study, an oxidative stress model was first developed in a mouse macrophage cell line (RAW264.7 cells) by infecting the cells with porcine circovirus type 2 (PCV2). The regulatory effect of Sophora subprosrate polysaccharide (SSP) on PCV2-induced oxidative stress was investigated. The results showed that after infection with PCV2, reactive oxygen species (ROS) and nitric oxide (NO) production, myeloperoxidase (MPO) activity, and inducible nitric oxide synthase (iNOS) expression were significantly increased. Meanwhile, the ratio of reduced glutathione to oxidized glutathione (GSH/GSSG) and hydroxyl radical prevention capacity were greatly reduced. These data indicate successful creation of an oxidative stress model in RAW264.7 cells. A dramatic decrease in cell viability was observed in the cells exposed to oxidative stress compared to the control. When the cells were treated with SSP in concentrations of 100, 200 or 400 µg/mL post PCV2 infection, an increase in the GSH/GSSG ratio and hydroxyl radical prevention capacity was observed. We also observed decreased ROS and NO production, MPO activity, and iNOS expression in the infected cells. Our results demonstrated that PCV2 infection was able to induce oxidative stress in RAW264.7 cells and that SSP could reduce the negative effects resulting from the PCV2 infection.

Immunomodulatory and antioxidant effects of carboxymethylpachymaran on the mice infected with PCV2.

The objective of the current study is to investigate the protective effect of carboxymethylpachymaran (CMP) on the immune system of mice via multiple infections with porcine circovirus type 2 (PCV2). The in vivo results showed that CMP administration significantly improved the spleen or thymus index, promoted the proliferation activities of T or B lymphocytes, and increased the production of glutathione, the superoxidase dismutase capacity, and the total antioxidant capacity in the spleen or thymus of PCV2-infected mice. The administration of different CMP doses to PVC2-inoculated mice resulted in the upregulation of IL-2 and IFN-α or the downregulation of IL-10 levels in the serum. These findings suggest that CMP has potential applications in regulating immunological functions to overcome the immunosuppresion caused by PCV2 infection in mice. The findings may also prove useful in designing effective therapies against PCV2 infection.

Immunomodulatory effect of a Sophora subprosrate polysaccharide in mice.

The aims of the present study were to investigate the immunomodulatory effect of a Sophora subprosrate polysaccharide (SSP1) on splenic lymphocyte proliferation, production of cytokines and antioxidant capacities in dexamethasone-induced immunosuppressed mice. The results showed that SSP1 stimulated proliferation and IFN-gamma secretion of murine splenic lymphocytes at concentrations of 50, 100, 200 or 400 mg/L in vitro. SSP1 increased the levels of interleukin-6 and tumor necrosis factor-alpha in immunosuppressed mice induced by subcutaneous injection of dexamethasone at 1.25 mg/kg. Administration of SSP1 by intraperitoneal injection significantly raised spleen index, glutathione level, glutathione peroxidase activity and lysozyme activity in the immunosuppressed mice. This suggests that SSP1 may play an important role in regulating immunological functions in mice.