title: [The alterations of nitric oxide synthase activity of ventricular cardiac muscle of rats in two septic shock models].
abstract: OBJECTIVE
  To observe the differences of hemodynamics and nitric oxide synthase(NOS) activity of ventricular cardiac muscle in two septic shock models and explore the possible mechanism.
  
  
  METHODS
  Two rat models of septic shock[lipopolysaccharide(LPS)-induced and cecal ligation and puncture (CLP)-induced septic shock] were used. The hemodynamic parameters and nitric oxide synthase activity of ventricular cardiac muscle were measured.
  
  
  RESULTS
  The hemodynamic parameters in CLP-induced model were increased in the early stage and decreased in the late stage while in LPS-induced model the parameters showed the same change of the CLP late stage. Both LPS model and CLP model (late stage) showed significant increase in NOS activity, but there was no difference between the two models. After treatment of the NOS inhibitor N-nitro-L-arginine methyl ester (L-NAME), the parameters of CLP-late stage and LPS model increased significantly. The NOS activity reached the highest level in the CLP-middle stage. The production of nitrite/nitrate decreased significantly in LPS model and CLP model(late stage) after treatment of L-NAME, but the nitrite/nitrate produced by constitutive NOS in LPS model was higher than CLP model(late stage).
  
  
  CONCLUSIONS
  The increase of the NOS activity may be the main reason to lead to the depression of the hemodynamic parameters. Inducible NOS may play the leading role in the LPS model while cNOS and iNOS have the same effect in the CLP model.
authors.affiliation: Zhejianglishui University, Lishui 323000, China.
authors.forename: Ting-mei
authors.initials: TM
authors.lastname: Ye
authors.forename: Ce
authors.initials: C
authors.lastname: Xu
authors.forename: Qin
authors.initials: Q
authors.lastname: Gao
authors.forename: Xin-mei
authors.initials: XM
authors.lastname: Zhou
authors.forename: Qi-xian
authors.initials: QX
authors.lastname: Shan
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xia
mesh_terms: D000818:Animals; D006439:Hemodynamics; D008070:Lipopolysaccharides; D008297:Male; D032383:Myocytes, Cardiac / Q000378:metabolism*; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012772:Shock, Septic / Q000145:classification / Q000378:metabolism*
chemical_list: D008070:Lipopolysaccharides; D019001:Nitric Oxide Synthase