title: [Changes in humoral immunity in sensitized guinea pigs exposed to trichloroethylene].
abstract: OBJECTIVE
  To study the changes of serum complement C and immunoglobulin (Ig) in sensitized guinea pigs exposed to trichloroethylene.
  
  
  METHODS
  Thirty six white female guinea pigs (250 ∼ 300 g) were randomly divided into blank control group (5 guinea pig), solvent (olive oil) control group (5 guinea pig) and TCE treatment group (26 guinea pig). According to guinea pig maximization test (GPMT), guinea pigs were exposed to TCE. After stimulating contact for 24 h, the skin reactions of guinea pig back test area were recorded and scored. According to Skin sensitization integral, the guinea pigs treated with TCE were divided into the sensitized group (score ≥ 1) and un-sensitized group (score 0). The concentrations of serum C3, C4, IgA, IgG and IgM were detected in 24 and 72 h, respectively after the experiment.
  
  
  RESULTS
  The sensitization rates of group treated by TCE was 65.38%. The serum C3 levels of groups sensitized to TCE for 24 and 73h were 99.75 ± 1.45 and 93.28 ± 3.61g/ml, respectively, which were significantly lower than that (112.30 ± 9.10 g/ml) of solvent control group (P < 0.05). Also The serum C4 levels of groups sensitized to TCE for 24 and 73 h were 34.63 ± 2.53 and 33.82 ± 2.76g/ml, respectively, which were significantly lower than that (43.87 ± 3.65 g/ml) of solvent control group (P < 0.05). The serum IgA and IgM levels of groups sensitized to TCE and unsensitized to TCE for 24 and 72 h were significantly lower than those of solvent group (P < 0.05). as compared with unsensitized groups, the serum IgA levels of the groups sensitized to TCE for 24 and 72 h significantly decreased (P < 0.05).
  
  
  CONCLUSIONS
  After the guinea pig skin was sensitized to TCE, the serum C3, C4 levels decreased, the immune function disordered.
authors.affiliation: Department of Occupational and Environmental, School of Public Health, Anhui Medical University, Hefei 230032, China.
authors.forename: Qi-xing
authors.initials: QX
authors.lastname: Zhu
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.forename: Jing
authors.initials: J
authors.lastname: Leng
authors.forename: Tong
authors.initials: T
authors.lastname: Shen
mesh_terms: D000818:Animals; D003165:Complement System Proteins / Q000378:metabolism*; D005260:Female; D006168:Guinea Pigs; D056724:Immunity, Humoral / Q000187:drug effects*; D007136:Immunoglobulins / Q000097:blood*; D012867:Skin / Q000187:drug effects; D014241:Trichloroethylene / Q000633:toxicity*
chemical_list: D007136:Immunoglobulins; D014241:Trichloroethylene; D003165:Complement System Proteins