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Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery.

Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Research Abstract Details 

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  • Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Abstract Text:

    johnny d figueroaJohnny D Figueroa,richard l bentonRichard L Benton,ixane velazquezIxane Velazquez,aranza i torradoAranza I Torrado,cristina m ortizCristina M Ortiz,carmen m hernandezCarmen M Hernandez,juan j diazJuan J Diaz,david s magnusonDavid S Magnuson,scott r whittemoreScott R Whittemore,jorge d mirandaJorge D Miranda,

    Functional impairment after spinal cord injury (SCI) is partially attributed to neuronal cell death, with further degeneration caused by the accompanying apoptosis of myelin-forming oligodendrocytes. The Eph receptor protein tyrosine kinase family and its cognate ligands, the ephrins, have been identified to be involved in axonal outgrowth, synapse formation, and target recognition, mainly mediated by repulsive activity. Recent reports suggest that ephrin/Eph signaling might also play a role as a physiological trigger for apoptosis during embryonic development. Here, we investigated the expression profile of EphA7, after SCI, by using a combination of quantitative real-time PCR (QRT-PCR) and immunohistochemical techniques. QRT-PCR analysis showed an increase in the expression of full-length EphA7 at 7 days postinjury (DPI). Receptor immunoreactivity was shown mostly in astrocytes of the white matter at the injury epicenter. In control animals, EphA7 expression was observed predominantly in motor neurons of the ventral gray matter, although some immunoreactivity was seen in white matter. Furthermore, blocking the expression of EphA7 after SCI using antisense oligonucleotides resulted in significant acceleration of hindlimb locomotor recovery at 1 week. This was a transient effect; by 2 weeks postinjury, treated animals were not different from controls. Antisense treatment also produced a return of nerve conduction, with shorter latencies than in control treated animals after transcranial magnetic stimulation. We identified EphA7 receptors as putative regulators of apoptosis in the acute phase after SCI. These results suggest a functional role for EphA7 receptors in the early stages of SCI pathophysiology.

    Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Publishing Authors By Initials

    jd figueroaJD Figueroa,rl bentonRL Benton,i velazquezI Velazquez,ai torradoAI Torrado,cm ortizCM Ortiz,cm hernandezCM Hernandez,jj diazJJ Diaz,ds magnusonDS Magnuson,sr whittemoreSR Whittemore,jd mirandaJD Miranda,

    For similar genetic processes: gene expression regulation: up-regulation research abstracts see: genetic processes: gene expression regulation: up-regulation research

    PUBMED ID PMID:

    MEDLINE DATE:

    Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Journal Published:

    PUBLICATION TYPE: Research Support, Non-U.S. Gov

    Journal: Journal of neuroscience research

    VOLUME: 84

    Page Numbers: 1438-51

    Journal Abbreviation: J. Neurosci. Res.

    ISSN: 0360-4012

    DAY: 15

    MONTH: Nov

    YEAR: 2006

    Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Information

    Number of References:

    LANGUAGE: eng

    NlmUniqueID: 7600111

    Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Keywords Mesh Terms:

    KEYWORDS: Up-Regulation

    MESH TERMS: physiology

    Chemical & Substance for Abstract: Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery. Information

    Substance Name: Phosphopyruvate Hydratase

    Registry Number: EC 4.2.1.11

    Grant and Affiliation Information for Inhibition of EphA7 up-regulation after spinal cord injury reduces apoptosis and promotes locomotor recovery.

    AFFILIATION: Department of Physiology, University of Puerto Rico Medical Science Campus, San Juan, Puerto Rico.

    Country: United States

    United States Research PublicationUnited States Research Publication

    AGENCY: United States NCRR

    GRANT: RR15576

    ACRONYM: RR

    MEDLINETA: J Neurosci Res

    REFSOURCE:

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