Nerve Growth Factor Role on Retinal Ganglion Cell Survival and Axon Regrowth: Effects of Ocular Administration in Experimental Model of Optic Nerve Injury

Retinal ganglion cell (RGC) degeneration occurs within 2 weeks following optic nerve crush (ONC) as a consequence of reduced retro-transport of growth factors including nerve growth factor (NGF). The hypothesis that intravitreal (ivt) and eye drop (ed) administration of recombinant human NGF (rhNGF)...

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Veröffentlicht in:Molecular neurobiology 2019-02, Vol.56 (2), p.1056-1069
Hauptverfasser: Mesentier-Louro, Louise A., Rosso, Pamela, Carito, Valentina, Mendez-Otero, Rosalia, Santiago, Marcelo F., Rama, Paolo, Lambiase, Alessandro, Tirassa, Paola
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container_end_page 1069
container_issue 2
container_start_page 1056
container_title Molecular neurobiology
container_volume 56
creator Mesentier-Louro, Louise A.
Rosso, Pamela
Carito, Valentina
Mendez-Otero, Rosalia
Santiago, Marcelo F.
Rama, Paolo
Lambiase, Alessandro
Tirassa, Paola
description Retinal ganglion cell (RGC) degeneration occurs within 2 weeks following optic nerve crush (ONC) as a consequence of reduced retro-transport of growth factors including nerve growth factor (NGF). The hypothesis that intravitreal (ivt) and eye drop (ed) administration of recombinant human NGF (rhNGF) might counteract ONC in adult rats is explored in this study. We found that both ivt- and ed-rhNGF reduced RGC loss and stimulated axonal regrowth. Chiefly, survival and regenerative effects of rhNGF were associated with a reduction of cells co-expressing Nogo-A/p75NTR at crush site borders, which contribute to glia scar formation following nerve injury, and induce further degeneration. We also found that ocular application of rhNGF reduced p75NTR and proNGF and enhanced phosphorylation of TrkA and its intracellular signals at retina level. Nogo-R and Rock2 expression was also normalized by ed-rhNGF treatment in both ONC and contralateral retina. Our findings that ocular applied NGF reaches and exerts biological actions on posterior segment of the eye give a further insight into the neurotrophin diffusion/transport through eye structures and/or their trafficking in optic nerve. In addition, the use of a highly purified NGF form in injury condition in which proNGF/p75NTR binding is favored indicates that increased availability of mature NGF restores the balance between TrkA and p75NGF, thus resulting in RGC survival and axonal growth. In conclusion, ocular applied NGF is confirmed as a good experimental paradigm to study mechanisms of neurodegeneration and regeneration, disclose biomarkers, and time windows for efficacy treatment following cell or nerve injury.
doi_str_mv 10.1007/s12035-018-1154-1
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In addition, the use of a highly purified NGF form in injury condition in which proNGF/p75NTR binding is favored indicates that increased availability of mature NGF restores the balance between TrkA and p75NGF, thus resulting in RGC survival and axonal growth. 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subjects Animals
Biomedical and Life Sciences
Biomedicine
Cell Biology
Cell survival
Cell Survival - drug effects
Eye
Growth factors
Male
Models, Theoretical
Nerve growth factor
Nerve Growth Factor - pharmacology
Neurobiology
Neurodegeneration
Neurology
Neurosciences
Nogo protein
Nogo Proteins - metabolism
Optic nerve
Optic Nerve - drug effects
Optic Nerve Injuries - chemically induced
Optic Nerve Injuries - drug therapy
Phosphorylation
Rats, Long-Evans
Regeneration
Regrowth
Retina
Retina - metabolism
Retinal ganglion cells
Retinal Ganglion Cells - drug effects
Retinal Ganglion Cells - metabolism
TrkA protein
TrkA receptors
title Nerve Growth Factor Role on Retinal Ganglion Cell Survival and Axon Regrowth: Effects of Ocular Administration in Experimental Model of Optic Nerve Injury
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