title: Tumor-promoting effect of GGN-MRP extract from the Maillard reaction products of glucose and glycine in the presence of sodium nitrite in C3H10T1/2 cells.
abstract: GGN-MRP is an extract from the Maillard reaction products of nitrite with glucose and glycine in the Maillard browning system. No genotoxicity of GGN-MRP in culture hepatocyte was found. A two-stage transformation protocol was used to transform chemically mouse embryo fibroblast C3H10T1/2 cells. To initiate transformation, the cells were treated with benzo[a]pyrene [B(a)P; 0.1 microg/mL], and GGN-MRP (0.01, 0.1, and 1.0 mg/mL) was employed to subsequently complete the transformation process. Malignant transformed foci were formed in B(a)P-initiated and GGN-MRP-promoted C3H10T1/2 cells after 8 weeks. Cells treated with GGN-MRP alone failed to induce transformation. However, cells initiated with B(a)P and promoted by GGN-MRP demonstrated oncogenic properties. Transformed colonies derived from GGN-MRP-treated cells exhibited enhanced growth rate, anchorage independence, and tumorgenicity in animals relative to parent cells. These results indicated that GGN-MRP contains a tumor promoter and may induce tumor promotion by two-stage oncogenesis.
authors.affiliation: Institute of Biochemistry, College of Medicine, Chung Shan Medical University, Taichung, Taiwan.
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
authors.forename: T H
authors.initials: TH
authors.lastname: Tseng
authors.forename: J D
authors.initials: JD
authors.lastname: Hsu
authors.forename: C J
authors.initials: CJ
authors.lastname: Wang
mesh_terms: D000818:Animals; D002455:Cell Division / Q000502:physiology; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D005947:Glucose / Q000378:metabolism*; D005998:Glycine / Q000378:metabolism*; D015416:Maillard Reaction; D051379:Mice; D012977:Sodium Nitrite / Q000494:pharmacology*
chemical_list: D005947:Glucose; D012977:Sodium Nitrite; D005998:Glycine