Metallothionein-IIA promotes neurite growth via the megalin receptor

Melinda Fitzgerald*, Pia Nairn, Carole A. Bartlett, Roger S. Chung, Adrian K. West, Lyn D. Beazley

*Corresponding author for this work

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Metallothionein (MT)-I/II has been shown to be neuroprotective and neuroregenerative in a model of rat cortical brain injury. Here we examine expression patterns of MT-I/II and its putative receptor megalin in rat retina. At neonatal stages, MT-I/II was present in retinal ganglion cells (RGCs) but not glial or amacrine cells; megalin was present throughout the retina. Whilst MT-I/II was absent from adult RGC in normal animals and after optic nerve transection, the constitutive megalin expression in RGCs was lost following optic nerve transection. In vitro MT-IIA treatment stimulated neuritic growth: more RGCs grew neurites longer than 25 μm (P < 0.05) in dissociated retinal cultures and neurite extension increased in retinal explants (P < 0.05). MT-IIA treatment of mixed retinal cultures increased megalin expression in RGCs, and pre-treating cells with anti-megalin antibodies prevented MT-IIA-stimulated neurite extension. Our results indicate that MT-IIA stimulates neurite outgrowth in RGCs and may do so via the megalin receptor; we propose that neurite extension is triggered via signal transduction pathways activated by the NPxY motifs of megalin's cytoplasmic tail.

Original languageEnglish
Pages (from-to)171-180
Number of pages10
JournalExperimental Brain Research
Volume183
Issue number2
DOIs
Publication statusPublished - Nov 2007
Externally publishedYes

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