RGD Reference Report - Gene expression alterations of neurotrophins, their receptors and prohormone convertases in a rat model of spinal cord contusion. - Rat Genome Database

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Gene expression alterations of neurotrophins, their receptors and prohormone convertases in a rat model of spinal cord contusion.

Authors: Hajebrahimi, Z  Mowla, SJ  Movahedin, M  Tavallaei, M 
Citation: Hajebrahimi Z, etal., Neurosci Lett. 2008 Aug 29;441(3):261-6. Epub 2008 Jun 21.
RGD ID: 2308892
Pubmed: PMID:18585435   (View Abstract at PubMed)
DOI: DOI:10.1016/j.neulet.2008.06.046   (Journal Full-text)

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.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
NTRK1HumanSpinal Cord Injuries  ISONtrk1 (Rattus norvegicus)mRNA:decreased expression:spinal cordRGD 
NTRK3HumanSpinal Cord Injuries  ISONtrk3 (Rattus norvegicus)mRNA:decreased expression:spinal cordRGD 
Ntrk1RatSpinal Cord Injuries  IEP mRNA:decreased expression:spinal cordRGD 
Ntrk1MouseSpinal Cord Injuries  ISONtrk1 (Rattus norvegicus)mRNA:decreased expression:spinal cordRGD 
Ntrk3RatSpinal Cord Injuries  IEP mRNA:decreased expression:spinal cordRGD 
Ntrk3MouseSpinal Cord Injuries  ISONtrk3 (Rattus norvegicus)mRNA:decreased expression:spinal cordRGD 

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Pcsk1Ratresponse to axon injury  IEP  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Ntrk1  (neurotrophic receptor tyrosine kinase 1)
Ntrk3  (neurotrophic receptor tyrosine kinase 3)
Pcsk1  (proprotein convertase subtilisin/kexin type 1)

Genes (Mus musculus)
Ntrk1  (neurotrophic tyrosine kinase, receptor, type 1)
Ntrk3  (neurotrophic tyrosine kinase, receptor, type 3)

Genes (Homo sapiens)
NTRK1  (neurotrophic receptor tyrosine kinase 1)
NTRK3  (neurotrophic receptor tyrosine kinase 3)


Additional Information