title: Phorbol-ester-mediated expression of the collagen type I pro-alpha 2 gene in mouse 3T3-L1 cells and its absence in a phorbol 12-myristate 13-acetate-non-responsive variant.
abstract: We have previously isolated a phorbol 12-myristate 13-acetate (PMA)-non-responsive variant line (VT-1) from mouse 3T3-L1 cells [Shimizu, Fujiki, Sugimura & Shimizu (1986) Cancer Res. 46, 4027-4031]. Differential hybridization of cDNAs obtained from PMA-treated 3T3-L1 and VT-1 cells resulted in the isolation of a number of unique cDNA clones, including one with a high degree of sequence similarity to the type I pro-alpha 2 collagen gene (COL1A2) [Amagai, Inokuchi, Nishikawa, Shimizu & Shimizu (1989) Somat. Cell Mol. Genet. 15, 153-158]. Here we examined the expression of type I collagen pro-alpha 2 [pro-alpha 2(I)] mRNA and production of type I collagen in these two cell lines. In quiescent cells, the pro-alpha 2(I) steady-state mRNA levels were four times greater in 3T3-L1 cells than in VT-1 cells. PMA addition caused the steady-state levels of pro-alpha 2(I) mRNA to be six times greater in 3T3-L1 cells than in VT-1 cells, with a maximum at 30-60 min. The pro-alpha 2(I) protein levels in the extracellular matrix or culture media of 3T3-L1 cells were substantially elevated by PMA treatment, but no significant increase was detected in VT-1 cells. The correlation of collagen expression with a PMA-mediated mitogenic response suggests a new role for collagen as an early component of mitogenic signal transduction.
authors.affiliation: Department of Molecular and Cellular Biology, University of Arizona, Tucson 85721.
authors.forename: I
authors.initials: I
authors.lastname: Stuiver
authors.forename: Y
authors.initials: Y
authors.lastname: Shimizu
authors.forename: N
authors.initials: N
authors.lastname: Shimizu
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D002460:Cell Line; D003513:Cycloheximide / Q000494:pharmacology; D004351:Drug Resistance; D004591:Electrophoresis, Polyacrylamide Gel; D005109:Extracellular Matrix / Q000737:chemistry; D015870:Gene Expression / Q000187:drug effects; D051379:Mice; D011347:Procollagen / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D011347:Procollagen; D012333:RNA, Messenger; D003513:Cycloheximide; D013755:Tetradecanoylphorbol Acetate