title: Effect of combined administration of insulin-like growth factor and platelet-derived growth factor on the regeneration of transected and anastomosed sciatic nerve in rats.
abstract: OBJECTIVE
  To evaluate the efficacy of combined administration of platelet-derived growth factor (PDGF) and insulin-like growth factor (IGF-I) on the regeneration of transected and anastomosed sciatic nerves.
  
  
  METHODS
  25 male Lewis rats.
  
  
  METHODS
  Transection and anastomosis was performed of the left sciatic nerve of all rats. At the time of surgery, treatment group rats received a combination of PDGF (0.75 microgram) and IGF-I (1.5 micrograms) along with vehicle (2% methyl cellulose gel) at the anastomosis site. Control rats received vehicle alone. Evaluation consisted of motor evoked potentials and nerve conduction velocity, quantitative histologic examination, sciatic functional index, and visual assessment of repair organization (lesion scores).
  
  
  RESULTS
  Significant differences in motor evoked potential latency, nerve conduction velocity, axon number, sciatic functional index, or lesion scores were not found between groups.
  
  
  CONCLUSIONS
  Combined administration of PDGF and IGF-I did not enhance peripheral nerve regeneration in a transection and anastomosis model as determined 6 weeks after surgery.
  
  
  CONCLUSIONS
  These findings support the assumption that mechanical, versus trophic, effects predominate when nerve ends are closely apposed.
authors.affiliation: School of Veterinary Medicine, Tufts University, North Grafton, MA 01536, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Welch
authors.forename: K H
authors.initials: KH
authors.lastname: Kraus
authors.forename: M R
authors.initials: MR
authors.lastname: Wells
authors.forename: D G
authors.initials: DG
authors.lastname: Blunt
authors.forename: J
authors.initials: J
authors.lastname: Weremowitz
mesh_terms: D000714:Anastomosis, Surgical; D000818:Animals; D004347:Drug Interactions; D005071:Evoked Potentials / Q000187:drug effects / Q000502:physiology; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology*; D008297:Male; D009046:Motor Neurons / Q000187:drug effects / Q000502:physiology*; D009416:Nerve Regeneration / Q000187:drug effects*; D009431:Neural Conduction / Q000187:drug effects / Q000502:physiology; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D051381:Rats; D011917:Rats, Inbred Lew; D012584:Sciatic Nerve / Q000187:drug effects / Q000502:physiology* / Q000601:surgery; D013997:Time Factors
chemical_list: D010982:Platelet-Derived Growth Factor; D007334:Insulin-Like Growth Factor I