title: [Effects of pyrethroids on the activity of gamma-aminobutyric acid transferase in rat brain].
abstract: OBJECTIVE
  To study the effects of pyrethroids on the activity of gamma-aminobutyric acid transferase (GABAT) in rat brain.
  
  
  METHODS
  The coupled enzyme ultraviolet spectrophotography was applied to observe the effects of deltamethrin (DM) and permethrin (PM) on the activities of GABAT in rat cerebral cortex, hippocampus, corpus striatum and cerebellum in vitro and in vivo.
  
  
  RESULTS
  In vitro, DM and PM had no significant effects on the activities of GABAT in rat cerebral cortex, hippocampus, corpus striatum and cerebellum at the final concentration of 10(-9) - 10(-4) mol/L. When 37.5 mg/kg DM and 600 mg/kg PM were orally administrated to the rats at one time, the activities of GABAT in rat cerebral cortex, hippocampus and cerebellum in the DM group [(2.96 +/- 0.43), (2.13 +/-0.44), (5.12 +/- 1.36) nmol x mg pro(-1) x min(-1), respectively] were lower than those in the control group [(3.43 +/- 0.41), (2.68 +/- 0.47), (6.74 +/- 1.64) nmol x mg pro(-1) x min(-1)] (P < 0.05), and the activities of GABAT in rat cerebral cortex and hippocampus in the PM group [(4.57 +/- 0.30), (4.18 +/- 0.63) nmol.mg pro(-1) x min(-1), respectively] were higher than those in the control group (P < 0.05). When 12.5 mg/kg DM and 200 mg/kg PM were orally administrated to the rats once a day for consecutive five days, the two pesticides had no significant effects on the activities of GABAT in rat cerebral cortex, hippocampus, corpus striatum and cerebellum (P > 0.05).
  
  
  CONCLUSIONS
  In vitro, DM and PM had no significant effects on the activity of GABAT in rat brain; in vivo, DM and PM may have different effects on the activity of GABAT in rat brain, which deserve further study.
authors.affiliation: Department of Environmental Toxicology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Zhi-ying
authors.initials: ZY
authors.lastname: Ji
authors.forename: Nian
authors.initials: N
authors.lastname: Shi
authors.forename: Su-qing
authors.initials: SQ
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Dong
authors.forename: Mao-shan
authors.initials: MS
authors.lastname: Chen
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000201:enzymology; D066298:In Vitro Techniques; D007306:Insecticides / Q000633:toxicity*; D008297:Male; D011722:Pyrethrins / Q000633:toxicity*; D051381:Rats; D013053:Spectrophotometry; D014166:Transferases / Q000378:metabolism*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: D007306:Insecticides; D011722:Pyrethrins; D005680:gamma-Aminobutyric Acid; D014166:Transferases