taiwanin-c and Mouth-Neoplasms

Topics: 4-Nitroquinoline-1-oxide; Animals; Antineoplastic Agents, Phytogenic; Apoptosis; Arecoline; Carcinoma, Squamous Cell; Cell Line, Tumor; Cell Proliferation; ErbB Receptors; Humans; Lactones; Lignans; Male; Mice, Inbred C57BL; Mouth Neoplasms; Phosphoinositide-3 Kinase Inhibitors

Arecoline, the most abundant alkaloid in betel nut is known to promote abnormal proliferation of epithelial cells by enhancing epidermal growth factor receptor (EGFR) activation and cyclooxygenase-2 (COX2) expression. Taiwanin C, a naturally occurring lignan extracted from Taiwania cryptomerioides, has been found to be a potential inhibitor of COX2 expression. Based on the MTT assay results, taiwanin C was found to be effective in inhibiting the tumorous T28 cell than the non-tumorous N28 cells. The modulations in the expression of relevant proteins were determined to understand the mechanism induced by taiwanin C to inhibit T28 cell proliferation. The levels of activated EGFR and COX2 were found to be abnormally high in the T28 oral cancer cells. However, taiwanin C was found to inhibit the activation of EGFR and regulated other related downstream proteins and thereby inhibited the T28 cell proliferation. In conclusion the results indicate that taiwanin C suppresses COX2-EGFR and enhances P27 pathways to suppress arecoline induced oral cancer cell proliferation via ERK1/2 inactivation. © 2015 Wiley Periodicals, Inc. Environ Toxicol 32: 62-69, 2017.

Topics: 4-Nitroquinoline-1-oxide; Animals; Antineoplastic Agents, Phytogenic; Arecoline; Cell Cycle Proteins; Cell Proliferation; Cyclooxygenase 2 Inhibitors; ErbB Receptors; Lactones; Lignans; Male; MAP Kinase Signaling System; Mice; Mice, Inbred C57BL; Mouth Neoplasms

Cancer is one of the leading causes of death worldwide, and oral squamous cell carcinoma (OSCC) accounts for almost a sixth of all reported cancers. Arecoline, from areca nut is known to enhance carcinogenesis in oral squamous cells. The objective of this study is to determine the effect of Taiwanin C, from Taiwania cryptomerioides Hayata against Arecoline-associated carcinogenesis. An OSCC model was created in C57BL/6J Narl mice by administrating 0.5 mg mL

Topics: 4-Nitroquinoline-1-oxide; Animals; Arecoline; beta Catenin; Cell Line, Tumor; Cell Movement; Cell Proliferation; Dose-Response Relationship, Drug; Down-Regulation; Enzyme Activation; Gene Expression Regulation, Neoplastic; Glycogen Synthase Kinase 3 beta; Humans; Lactones; Lignans; Mice; Mouth Neoplasms; Signal Transduction; Xenograft Model Antitumor Assays