Roles of keratinocyte inflammation in oral cancer: regulating the prostaglandin E2, interleukin-6 and TNF-alpha production of oral epithelial cells by areca nut extract and arecoline.
Betel quid (BQ) chewing is an etiologic factor of oral cancer and submucus fibrosis (OSF). Keratinocyte inflammation is crucial for the pathogenesis of cancer and tissue fibrosis. We found that areca nut (AN) extract (100-400 micro g/ml) induced PGE2 production by KB cells by 2.34- to 23.1-fold and also TNF-alpha production by gingival keratinocytes (GK). Arecoline (0.2-1.2 mM) elevated PGE2 production by KB cells by 2.5- to 6.1-fold. AN extract (200-400 micro g/ml) also induced IL-6 production by GK (7.5- to 8.4-fold) and KB cells. In contrast, arecoline (0.1-1.2 mM) suppressed IL-6 production by GK and KB cells, with 42-81 and 41-63% inhibition, respectively. A 48 h exposure of GK to 800-1200 micro g/ml AN extract led to 37-69% cell death. Arecoline cytotoxicity to GK was noted at concentrations of 0.8-1.2 mM, which led to 28-38% cell death. AN extract (400-800 micro g/ml) induced Cox-2 and IL-6 mRNA expression and also COX-2 protein production by KB cells. IL-6 (5-100 ng/ml) suppressed GK growth by 20-33%, but enhanced oral fibroblast (OMF) and KB cell growth. PGE2 (0.05-5 micro g/ml) and anti-IL-6 antibody (ab) (50-1000 ng/ml) showed little effect on GK and KB cell growth. Incubation of GK and KB cells with aspirin, anti-IL-6 ab and anti-TNF-alpha ab showed little effect on arecoline- and AN-induced cytotoxicity, cell cycle arrest and apoptosis. Exposure to anti-TNF-alpha ab slightly affected arecoline- and AN-modulated PGE2 and IL-6 production by GK and KB cells. Arecoline- and AN-conditioned medium decreased phytohemagglutinin-mediated CD4+ and CD8+ T cell activation. These results indicate that BQ chewing contributes to the pathogenesis of cancer and OSF by impairing T cell activation and by induction of PGE2, TNF-alpha and IL-6 production, which affect oral mucosal inflammation and growth of OMF and oral epithelial cells.
Jeng
Jiiang-Huei
JH
Laboratory of Dental Pharmacology and Toxicology, Department of Dentistry, National Taiwan University Hospital and National Taiwan University College of Medicine, Taiwan.
Wang
Ying-Jan
YJ
Chiang
Bor-Luen
BL
Lee
Po-Hsuen
PH
Chan
Chiu-Po
CP
Ho
Yuan-Soon
YS
Wang
Tong-Mei
TM
Lee
Jang-Jaer
JJ
Hahn
Liang-Jiunn
LJ
Chang
Mei-Chi
MC
D001114:Areca / Q000737:chemistry*; D001115:Arecoline / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D051546:Cyclooxygenase 2; D015232:Dinoprostone / Q000096:biosynthesis*; D005881:Gingiva / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000209:etiology / Q000473:pathology; D015850:Interleukin-6 / Q000096:biosynthesis*; D007527:Isoenzymes / Q000096:biosynthesis / Q000235:genetics; D007624:KB Cells; D015603:Keratinocytes / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008213:Lymphocyte Activation; D008565:Membrane Proteins; D009061:Mouth Mucosa / Q000187:drug effects* / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology*; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D013601:T-Lymphocytes / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
D015850:Interleukin-6; D007527:Isoenzymes; D008565:Membrane Proteins; D010936:Plant Extracts; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D001115:Arecoline; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D015232:Dinoprostone