A monomer purified from Paris polyphylla (PP-22) triggers S and G2/M phase arrest and apoptosis in human tongue squamous cell carcinoma SCC-15 by activating the p38/cdc25/cdc2 and caspase 8/caspase 3 pathways.

Recent studies have shown that the aqueous, ethanolic extracts and a monomer compound of Paris polyphylla exhibit anticancer activity toward several types of cancer cell lines, but the anticancer activity of (3ß,17α,25R)-spirost-5-ene-3,17-diol 3-O-α-L-rhamnopyranosyl-(1 â†’ 2)-ß-D-glucopyranoside, a monomer isolated from P. polyphylla (PP), named PP-22, has not been reported previously. In this study, we investigated the effect of PP-22 on human tongue squamous cell carcinoma SCC-15 cells in vitro. MTT assays showed that PP-22 inhibited the growth of SCC-15 cells and had no obvious inhibitory effects on human liver L02 cells. Flow cytometry assays showed that the percentages of apoptotic cells were increased. In addition, cleaved caspase-8, cleaved caspase-3 and cleaved poly (ADP-ribose) polymerase (PARP) could be detected by Western blotting. Flow cytometry also showed that PP-22 triggered S and G2/M phases arrest in SCC-15 cells, and on the other hand, the expression of cyclin A, cyclin E2, cyclin B1, phospho-cell division cycle2 (p-cdc2)(Tyr15), p-Wee1, Myt1, and p53 was upregulated. Moreover, p-p38 levels increased, p-extracellular signal-regulated kinase (ERK) levels decreased, and cdc25B expression was inhibited. Furthermore, the p38/mitogen-activated protein kinase (MAPK) inhibitor SB203580 reversed the increase of the expression level of p38, p-cdc2 (Tyr15), cleaved caspase 3, cleaved PARP, p-p53, and p53 and reversed the decrease in cdc25B expression. In conclusion, these results demonstrated that PP-22 activated p38, inhibited cdc25B, increased p-cdc2 (Tyr15), and triggered S and G2/M phase arrest, as well as activated p53 through the p38-p53 pathway, inhibited the MAPK/ERK pathway, activated the caspase 8/caspase 3 pathway, and triggered the extrinsic apoptotic pathway in SCC-15 cells.

Applications of cone-beam computed tomography to assess the effects of labial crown morphologies and collum angles on torque for maxillary anterior teeth.

INTRODUCTION: Currently, cone-beam computed tomography (CBCT) has been widely used because of its capacity to evaluate the anatomic structures of the maxilla, mandible, and teeth in 3 dimensions. However, articles about the use of CBCT to evaluate the relationships between the morphology of individual teeth and torque expression remain rare. In this study, we aimed to determine the influence of labial crown morphologies and collum angles on torque for maxillary anterior teeth using CBCT. METHODS: A total of 206 extracted maxillary anterior teeth were selected to establish scanning models using dental wax, and they were scanned by CBCT. Three-dimensionally reconstructed images and median sagittal sections of the teeth were digitized and analyzed with AutoCAD software (Autodesk, San Rafael, Calif). The angle α, formed by the intersection of the tangent at a certain vertical height on the labial surface from the incisal edge with the crown long axis, and the collum angle, were measured. RESULTS: The variations in angle α at different heights from the incisal edge for the same type of tooth were statistically significantly different (P <0.001). Moreover, the variations between collum angles and 0° for any type of maxillary anterior tooth were statistically significant (P <0.01). CONCLUSIONS: This study suggested that there are great differences in labial crown morphologies and collum angles for maxillary anterior teeth between persons, indicating that the morphologies of these teeth do play important roles in torque variations.

Advancements of Macrophages Involvement in Pathological Progression of Colitis-Associated Colorectal Cancer and Associated Pharmacological Interventions.

Intestinal macrophages play crucial roles in both intestinal inflammation and immune homeostasis. They can adopt two distinct phenotypes, primarily determined by environmental cues. These phenotypes encompass the classically activated pro-inflammatory M1 phenotype, as well as the alternatively activated anti-inflammatory M2 phenotype. In regular conditions, intestinal macrophages serve to shield the gut from inflammatory harm. However, when a combination of genetic and environmental elements influences the polarization of these macrophages, it can result in an M1/M2 macrophage activation imbalance, subsequently leading to a loss of control over intestinal inflammation. This shift transforms normal inflammatory responses into pathological damage within the intestines. In patients with ulcerative colitis-associated colorectal cancer (UC-CRC), disorders related to intestinal inflammation are closely correlated with an imbalance in the polarization of intestinal M1/M2 macrophages. Therefore, reinstating the equilibrium in M1/M2 macrophage polarization could potentially serve as an effective approach to the prevention and treatment of UC-CRC. This paper aims to scrutinize the clinical evidence regarding Chinese medicine (CM) in the treatment of UC-CRC, the pivotal role of macrophage polarization in UC-CRC pathogenesis, and the potential mechanisms through which CM regulates macrophage polarization to address UC-CRC. Our objective is to offer fresh perspectives for clinical application, fundamental research, and pharmaceutical advancement in UC-CRC.