title: [Effect of magnesium isoglycyrrhizinate on PLA2 during liver tissue injury following limb ischemia/reperfusion in rats].
abstract: OBJECTIVE
  To investigate the effects of magnesium isoglycyrrhizinate (MI) on the changes of phospholipase A2 (PLA2) induced during liver tissue injury following limb ischemia/reperfusion (I/R) in rats.
  
  
  METHODS
  Twenty-four healthy male Sprague-Dawley rats weighing (230+/-30) g were randomly divided into three groups (n = 8 each) as follows: control (Group C: anesthetization without any ischemia); I/R injury (Group I/R: 4 h ischemia induced by rubber band ligation of the left hind limb around the roots of the hind limb, followed by 6 h of reperfusion, with 1 mL normal saline given via tail vein prior to reperfusion); MI-treated group (Group MI: underwent ischemia and reperfusion, with 1 mL MI (30 mg/kg) infused prior to reperfusion). Levels of TNFa and PLA2 in plasma and liver tissue were measured by enzyme-linked immunosorbent assay (ELISA). Levels of plasma alanine aminotransferase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), creatine kinase (CK), myeloperoxidase (MPO), and malondialdehyde (MDA), and activities of MPO and MDA in liver tissue were measured by colorimetry. Ultrastructural changes of liver tissue were observed by electron microscopy.
  
  
  RESULTS
  The MI group had significantly lower PLA2 and TNFa in liver homogenates and serum than the I/R group (both P less than 0.05). Serum ALT, AST, LDH, and CK were significantly lower in the MI group than in the I/R group (all P less than 0.05), as were the levels of MPO and MDA in liver homogenates and serum (all P less than 0.05). The I/R group showed significantly more liver tissue damage, which appeared to be attenuated in the MI group.
  
  
  CONCLUSIONS
  MI treatment can inhibit the I/R-induced TNFa, PLA2, and MDA in plasma and liver tissue, as well as decrease the I/R-induced MPO activity in rats. Thus, MI may have protective effects against liver tissue injury following limb ischemia/reperfusion.
authors.affiliation: Department of Vascular Surgery, the First Affiliated Hospial of Fujian Medical University, Fuzhou, China.
authors.forename: Jin-chi
authors.initials: JC
authors.lastname: Zhang
authors.forename: Guo-fu
authors.initials: GF
authors.lastname: Zheng
authors.forename: Ming-xiang
authors.initials: MX
authors.lastname: Wu
authors.forename: Jia-wen
authors.initials: JW
authors.lastname: Wu
authors.forename: Liang-yuan
authors.initials: LY
authors.lastname: Ouyang
authors.forename: Xue-qiang
authors.initials: XQ
authors.lastname: Liu
mesh_terms: D000818:Animals; D005121:Extremities / Q000098:blood supply; D008099:Liver / Q000187:drug effects / Q000293:injuries / Q000378:metabolism*; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D054467:Phospholipases A2 / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000378:metabolism*; D012503:Saponins / Q000494:pharmacology*; D014315:Triterpenes / Q000494:pharmacology*
chemical_list: C521270:18alpha,20beta-hydroxy-11-oxo-norolean-12-en-3beta-yl-2-O-beta-D-glucopyranurosyl-alpha-D-glucopyranosiduronate magnesium tetrahydrate; D012503:Saponins; D014315:Triterpenes; D008315:Malondialdehyde; D054467:Phospholipases A2