title: Nitric oxide mediates inactivation of glutathione S-transferase in suspension culture of Taxus cuspidata during shear stress.
abstract: The importance of nitric oxide (NO) in regulating plant cell responses to environmental stresses is becoming evident. Here the possible role of NO in suspension cultures of Taxus cuspidata under shear stress was investigated in a Couette-type shear reactor. It was found that shear stress with 190 s(-1) caused NO generation in 8 h. NO formation can be inhibited by N-nitro-L-arginine, a nitric oxide synthase inhibitor. Moreover, the activity of glutathione S-transferase (GST), a principal enzyme responsible for detoxification, decreased during shear stress. This inactivation partially recovered when NOS inhibitor or NO scavenger was added into cell cultures during shear stress. Treatment with reactive nitrogen species (RNS) also caused inactivation of GST in cells. The results indicate that NO plays a crucial role in GST inactivation in Taxus cuspidata cells under shear stress.
authors.affiliation: Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, P.O. Box 6888, Tianjin 300072, PR China.
authors.forename: Yan-Wen
authors.initials: YW
authors.lastname: Gong
authors.forename: Ying-Jin
authors.initials: YJ
authors.lastname: Yuan
mesh_terms: D002478:Cells, Cultured; D005982:Glutathione Transferase / Q000378:metabolism*; D040542:Mechanotransduction, Cellular / Q000502:physiology*; D009569:Nitric Oxide / Q000378:metabolism*; D033081:Shear Strength; D013314:Stress, Mechanical; D020946:Taxus / Q000502:physiology*
chemical_list: D009569:Nitric Oxide; D005982:Glutathione Transferase