title: Elevated leptin expression in rat model of traumatic spinal cord injury and femoral fracture.
abstract: BACKGROUND
  Few studies have reported a relationship between leptin induced by spinal cord injury (SCI) and healing bone tissue.
  
  
  OBJECTIVE
  To observe serum and callus leptin expression within the setting of fracture and traumatic SCI.
  
  
  METHODS
  Seventy-two male Sprague Dawley rats were randomized equally into four groups: control, SCI group, fracture group, and fracture/SCI group. Rats were sacrificed at 7, 14, 21, and 28 days post-fracture/SCI. Serum leptin was detected using radioimmunoassay at 1, 7, 14, 21, and 28 days, and  callus formation was measured radiologically at 14, 21, and 28 days. Callus leptin was analyzed by means of immunohistochemistry.
  
  
  RESULTS
  Serum leptin in the fracture group, SCI group, and combined fracture/SCI group were all significantly increased compared to control  group at the 1, 7, 14, and 2-day time points (P < 0.05). Serum leptin in the combined fracture/SCI group was significantly higher than in the fracture group at 7, 14, and 21 days (P < 0.05), and higher than in SCI groups at 14 and 21days after operation  (P < 0.05). The percentage of leptin-positive cells in the fracture/SCI callus, and callus volume was significantly higher than in the fracture-only group (P < 0.001).
  
  
  CONCLUSIONS
  Overall, elevated leptin expression was demonstrated  within healing bone especially in the 21 days of a rat model combining fracture and SCI. A close association exists between leptin levels and the degree of callus formation in fractures.
authors: The Affiliated People's Hospital with Jiangsu University, Zhenjiang, Jiangsu Province, China.
authors: Lei
authors: L
authors: Wang
authors: Xingguo
authors: X
authors: Tang
authors: Hongxi
authors: H
authors: Zhang
authors: Jishan
authors: J
authors: Yuan
authors: Hua
authors: H
authors: Ding
authors: Yongzhong
authors: Y
authors: Wei
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D005264:Femoral Fractures / Q000097:blood* / Q000150:complications; D020738:Leptin / Q000097:blood*; D008297:Male; D046529:Microscopy, Electron, Transmission; D018482:Muscle, Skeletal / Q000473:pathology / Q000648:ultrastructure; D011863:Radioimmunoassay; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D013116:Spinal Cord / Q000473:pathology / Q000648:ultrastructure; D013119:Spinal Cord Injuries / Q000097:blood* / Q000150:complications; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D020738:Leptin