title: Enhanced expression of proneurotrophins in elevated introcular pressure-induced rat retinal ischemia.
abstract: BACKGROUND
  Proneurotrophins such as the precursor of nerve growth factor (proNGF) and the precursor of brain-derived neurotrophic factor (proBDNF) interacted with sortilin and p75(NTR) to form a complex capable of activating an apoptotic signaling. We found that the expression of p75(NTR) and sortilin was increased in ischemic retina induced by elevated intraocular pressure (IOP), but the protein expression changes of proNGF and proBDNF in the same situation were not clear. This study aimed to ascertain the protein expression changes of proNGF and proBDNF in ischemic retina induced by elevated IOP.
  
  
  METHODS
  Expression of proBDNF and proNGF was examined by double-labeling immunochemistry in normal rat retina, examined using Western blotting and analyzed using statistical methods in ischemic retina induced by elevated IOP.
  
  
  RESULTS
  Immunocytochemistry showed that the proBDNF expressed in the ganglion cell layer (GCL) while the proNGF primarily existed in both the nerve fiber layers (NFL) and large ganglion cell bodies of normal rat retina. Western blotting analysis demonstrated that the molecule weights of 28 kD (proBDNF)/25 kD (proNGF) band were increased significantly (P < 0.05) at days 3, 5 and 7 after retinal elevated-IOP-induced ischemia.
  
  
  CONCLUSIONS
  ProBDNF expressed in the GCL and proNGF primarily presented in NFL and large ganglion cell bodies of normal rat retina, the protein expression forms of 28 kD proBDNF and 25 kD proNGF increased in ischemic retina induced by elevated IOP.
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology & Vision Science Key Laboratory, Beijing 100730, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wei
authors.forename: Huai-Zhou
authors.initials: HZ
authors.lastname: Wang
authors.forename: Fu-Kang
authors.initials: FK
authors.lastname: Zhang
authors.forename: Jun-Peng
authors.initials: JP
authors.lastname: Zao
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Jiang
authors.forename: Qing-Jun
authors.initials: QJ
authors.lastname: Lu
authors.forename: Er-Jing
authors.initials: EJ
authors.lastname: Gao
authors.forename: Ning-Li
authors.initials: NL
authors.lastname: Wang
mesh_terms: D000818:Animals; D015153:Blotting, Western; D019208:Brain-Derived Neurotrophic Factor / Q000032:analysis*; D007150:Immunohistochemistry; D007429:Intraocular Pressure / Q000502:physiology*; D007511:Ischemia / Q000378:metabolism*; D008297:Male; D020932:Nerve Growth Factor / Q000032:analysis*; D011498:Protein Precursors / Q000032:analysis*; D051381:Rats; D017208:Rats, Wistar; D012164:Retinal Diseases / Q000378:metabolism*
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D011498:Protein Precursors; C426674:brain-derived neurotrophic factor precursor; D020932:Nerve Growth Factor