PMID- 18585435 OWN - NLM STAT- MEDLINE DCOM- 20081020 LR - 20161124 IS - 0304-3940 (Print) IS - 0304-3940 (Linking) VI - 441 IP - 3 DP - 2008 Aug 29 TI - Gene expression alterations of neurotrophins, their receptors and prohormone convertases in a rat model of spinal cord contusion. PG - 261-6 LID - 10.1016/j.neulet.2008.06.046 [doi] AB - We have used a semi-quantitative RT-PCR approach to investigate the alterations in the expression of the main regulators of neuronal survival and death, neurotrophins (NTs), NT receptors, and prohormone convertases (PC), in a rat model of spinal cord contusion. Our results revealed that the expression of the members of NT family (Nerve-Growth Factor (NGF), Brain-Derived Neurotrophic Factor (BDNF), and Neurotrophin-3 (NT-3)) is significantly declined in the injured spinal cord, as early as 6h after the induction of the contusion. The expression was recovered afterward to that of the control levels. Furthermore, the expression of all NTs high-affinity Trk receptors decreased severely after the contusion. While the expression of TrkA and TrkC were completely shut down after 6 and 12h after injury respectively, the expression of TrkB receptor declined at 12h after injury and remained at this low level thereafter. In contrast to the pattern of Trk receptor expression, p75NTR receptor showed a significant upregulation after contusion. The expression of PC members functioning in the constitutive secretory pathway, i.e. furin, PACE4 and PC7, increased after damage, while the expression of PC members acting in regulated secretory pathway, PC1 and PC2, reduced after spinal cord injury. All together, the down-regulation of NTs, their designated Trk receptors and PC1/PC2 enzymes along with an upregulation of p75NTR promote neuronal death after injury. Our results suggest that either overexpression of NTs, Trk receptors and PC1/PC2 or interfering with the expression of p75NTR in host and/or grafted cells before transplantation could increase the success of the transplantation. FAU - Hajebrahimi, Zahra AU - Hajebrahimi Z AD - Department of Genetics, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box: 14115-175, Tehran, Iran. FAU - Mowla, Seyed Javad AU - Mowla SJ FAU - Movahedin, Mansureh AU - Movahedin M FAU - Tavallaei, Mahmoud AU - Tavallaei M LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20080621 PL - Ireland TA - Neurosci Lett JT - Neuroscience letters JID - 7600130 RN - 0 (Brain-Derived Neurotrophic Factor) RN - 0 (Nerve Growth Factors) RN - 0 (Neurotrophin 3) RN - 0 (RNA, Messenger) RN - 0 (Receptor, Nerve Growth Factor) RN - 0 (Receptors, Nerve Growth Factor) RN - 9061-61-4 (Nerve Growth Factor) RN - EC 2.7.10.1 (Receptor Protein-Tyrosine Kinases) RN - EC 3.4.21.- (Proprotein Convertases) RN - EC 3.4.21.93 (Proprotein Convertase 1) SB - IM MH - Animals MH - Brain-Derived Neurotrophic Factor/genetics/metabolism MH - Disease Models, Animal MH - Down-Regulation/genetics MH - Gene Expression Regulation MH - Nerve Growth Factor/genetics/metabolism MH - Nerve Growth Factors/*genetics MH - Neurotrophin 3/genetics/metabolism MH - Proprotein Convertase 1/genetics/metabolism MH - Proprotein Convertases/*genetics MH - RNA, Messenger/analysis/metabolism MH - Rats MH - Rats, Sprague-Dawley MH - Receptor Protein-Tyrosine Kinases/genetics/metabolism MH - Receptor, Nerve Growth Factor/genetics/metabolism MH - Receptors, Nerve Growth Factor/*genetics MH - Reverse Transcriptase Polymerase Chain Reaction MH - Spinal Cord/*metabolism/pathology/physiopathology MH - Spinal Cord Injuries/*genetics/*metabolism/physiopathology EDAT- 2008/07/01 09:00 MHDA- 2008/10/22 09:00 CRDT- 2008/07/01 09:00 PHST- 2008/04/16 00:00 [received] PHST- 2008/06/14 00:00 [revised] PHST- 2008/06/18 00:00 [accepted] PHST- 2008/07/01 09:00 [pubmed] PHST- 2008/10/22 09:00 [medline] PHST- 2008/07/01 09:00 [entrez] AID - S0304-3940(08)00887-2 [pii] AID - 10.1016/j.neulet.2008.06.046 [doi] PST - ppublish SO - Neurosci Lett. 2008 Aug 29;441(3):261-6. doi: 10.1016/j.neulet.2008.06.046. Epub 2008 Jun 21.