title: [Lipid peroxidation affects serum T and Bcl-2 expression in the testis of aging male rats].
abstract: OBJECTIVE
  To investigate the effect of lipid peroxidation on testosterone (T) in the serum and bcl-2 expression in the Leydig cells of aging male rats.
  
  
  METHODS
  The D-galactose-induced subacute aging male rat model was established and 20 SD rats were randomly divided into two groups of equal number: a D-galactose (D) group and a control (C) group. The activity of superoxide dismutase(SOD) and the level of malondialdehyde (MDA) were examined by spectro-absorptiometer, the expression of bcl-2 by immunohistochemical method, and the concentration of serum T by radio-immunity technique.
  
  
  RESULTS
  (1) The activity of SOD in the testis of the D group was (116 +/- 18.09) U/ mg x prot, significantly lower than in the C group [(156 +/- 31.02) U/mg x prot (P < 0.01)]. (2) The level of MDA in the testis of the D group was (1.77 +/- 0.41) nmol/mg x prot, significantly higher than in the C group [(1.19 +/- 0.15) nmol/mg x prot (P < 0.05)]. (3) Serum T in the D group was (2.39 +/- 0.90) nmol/L, significantly lower than in the C group [(8.95 +/- 2.53) nmol/L (P < 0.01)]. (4) The expressions of bcl-2 in the leydig cells of the D and C groups were (35.1 +/- 3.6)% and (49.6 +/- 7.4)% respectively, with statistical difference between them (P < 0.01).
  
  
  CONCLUSIONS
  Lipid peroxidation affects the concentration of serum T and the expression of bcl-2 in the Leydig cells of aging male rats.
authors.affiliation: Department of Urology, Second Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong 515041, China. zbzhang@stu.edu.cn
authors.forename: Zhen-bao
authors.initials: ZB
authors.lastname: Zhang
authors.forename: Chong-yue
authors.initials: CY
authors.lastname: Cai
authors.forename: Sheng-ping
authors.initials: SP
authors.lastname: Tian
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Ren-han
authors.initials: RH
authors.lastname: Zhuang
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D015870:Gene Expression; D007985:Leydig Cells / Q000378:metabolism*; D015227:Lipid Peroxidation; D008297:Male; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis* / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D013739:Testosterone / Q000097:blood*
chemical_list: D019253:Proto-Oncogene Proteins c-bcl-2; D013739:Testosterone