title: Induction of prolyl hydroxylase activity in a nonadherent population of human leukocytes.
abstract: A nonadherent population of human monocytes has been shown to express the collagen hydroxylating enzyme prolyl hydroxylase in vitro. Enzyme levels present in freshly isolated nonadherent cells were induced 300% during the first 72 hours of culturing, which could be suppressed by cycloheximide. Maximum induction required both a feeder layer of adherent leukocytes, and 10-15% autologous plasma. Biosynthesis of Clq, a protein which also is hydroxylated by prolyl hydroxylase, by the nonadherent cells was significantly less than the adherent monocytes. Therefore, this collagen biosynthetic marker enzyme was not associated with Clq synthesis, which suggests that the enzyme is present for collagen biosynthesis.
authors.forename: W J
authors.initials: WJ
authors.lastname: Lindblad
authors.forename: J A
authors.initials: JA
authors.lastname: French
authors.forename: K S
authors.initials: KS
authors.lastname: Redford
authors.forename: S K
authors.initials: SK
authors.lastname: Buenaventura
authors.forename: I K
authors.initials: IK
authors.lastname: Cohen
mesh_terms: D002478:Cells, Cultured; D003094:Collagen / Q000096:biosynthesis*; D003166:Complement Activating Enzymes / Q000096:biosynthesis; D003172:Complement C1 / Q000096:biosynthesis; D015922:Complement C1q; D004790:Enzyme Induction; D006801:Humans; D007962:Leukocytes / Q000201:enzymology*; D009000:Monocytes / Q000502:physiology; D011393:Procollagen-Proline Dioxygenase / Q000096:biosynthesis*
chemical_list: D003172:Complement C1; D015922:Complement C1q; D003094:Collagen; D011393:Procollagen-Proline Dioxygenase; D003166:Complement Activating Enzymes