title: [Effect of expression of c-jun N-terminal kinase on neuron autophagy following diffuse brain injury in rats].
abstract: OBJECTIVE
  To study the effect and potential mechanism of expression of c-jun N-terminal kinase (JNK) signal pathway on neuron autophagy after diffuse brain injury (DBI).
  
  
  METHODS
  Male Sprague Dawley rats (n = 216) were randomly divided into four groups: DBI group (n = 54), SP600125 intervene group (n = 54), DMSO group (n = 54) and sham operation group (n = 54). DBI rat model was established according to the description of Marmarou DBI. At different time points (1, 6, 12, 24, 48 and 72 h) after operation, the histopathologic changes of neurons in cortex were observed by HE staining method; The expression of p-JNK, p-P53, DRAM and Beclin-1 were detected by Western blot and immunohistochemistry.
  
  
  RESULTS
  The results showed that under light microscope degenerated and necrotic neurons were observed to be scattered in cortex at 6 h after operation in DBI group, but these changes were low in SP600125 intervene group. Compared with SP600125 intervene group, the expression of p-JNK in DBI group were enhanced obviously at 6, 12 and 24 h (F = 17.902, P < 0.05); the expression of p-P53 in DBI group were enhanced obviously at 12, 24, 48 and 72 h (F = 7.107, P < 0.05); the expression of DRAM in DBI group were enhanced obviously at 6, 12, 24, 48 and 72 h (F = 15.455, P < 0.05); the expression of Beclin-1 in DBI group were enhanced obviously at 6, 12, 24, 48 and 72 h (F = 11.517, P < 0.05). Compared with DBI group, the expression of p-JNK, p-P53, DRAM and Beclin-1 in DMSO group were similar at 1, 6, 12, 24, 48 and 72 h (F = 1.509, P > 0.05).
  
  
  CONCLUSIONS
  The present results indicate that SP600125 can dramatically improve trauma brain injury from autophagy after DBI and the molecular mechanism is related to the modulation of JNK signal pathway following DBI, while it measures the neuron autophagy by means of intervening JNK signal pathway.
authors.affiliation: Department of Surgery, Hebei Medical University, Shijiazhuang 050017, China.
authors.forename: Ming-yan
authors.initials: MY
authors.lastname: Hong
authors.forename: Jian-zhong
authors.initials: JZ
authors.lastname: Cui
authors.forename: Ran
authors.initials: R
authors.lastname: Li
authors.forename: Yan-xia
authors.initials: YX
authors.lastname: Tian
authors.forename: Huan
authors.initials: H
authors.lastname: Wang
authors.forename: Hai-tao
authors.initials: HT
authors.lastname: Wang
authors.forename: Jun-ling
authors.initials: JL
authors.lastname: Gao
mesh_terms: D000818:Animals; D000873:Anthracenes / Q000494:pharmacology; D001343:Autophagy; D001930:Brain Injuries / Q000378:metabolism* / Q000473:pathology; D004195:Disease Models, Animal; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008297:Male; D009474:Neurons / Q000473:pathology*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000873:Anthracenes; C432165:pyrazolanthrone; D048031:JNK Mitogen-Activated Protein Kinases