Concentration of various trace elements in the rat retina and their distribution in different structures

Marta Ugarte, Geoffrey W. Grime, Gillian Lord, Kalotina Geraki, Joanna F. Collingwood, Mary E. Finnegan, Hannah Farnfield, Michael Merchant, Melanie J. Bailey, Neil I. Ward, Peter J. Foster, Paul N. Bishop, Neville N. Osborne, GW Grime, JF Collingwood, ME Finnegan, MJ Bailey, PJ Foster, PN Bishop

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Inductively coupled plasma mass spectrometry (ICP-MS) was used to quantify the total amount of trace elements in retina from adult male Sprague-Dawley rats (n = 6). Concentration of trace elements within individual retinal areas in frozen sections of the fellow eye was established with the use of two methodologies: (1) particle-induced X-ray emission (PIXE) in combination with 3D depth profiling with Rutherford backscattering spectrometry (RBS) and (2) synchrotron X-ray fluorescence (SXRF) microscopy. The most abundant metal in the retina was zinc, followed by iron and copper. Nickel, manganese, chromium, cobalt, selenium and cadmium were present in very small amounts. The PIXE and SXRF analysis yielded a non-homogenous pattern distribution of metals in the retina. Relatively high levels of zinc were found in the inner part of the photoreceptor inner segments (RIS)/outer limiting membrane (OLM), inner nuclear layer and plexiform layers. Iron was found to accumulate in the retinal pigment epithelium/choroid layer and RIS/OLM. Copper in turn, was localised primarily in the RIS/OLM and plexiform layers. The trace elements iron, copper, and zinc exist in different amounts and locations in the rat retina. © 2012 The Royal Society of Chemistry.
    Original languageEnglish
    Pages (from-to)1245-1254
    Number of pages9
    JournalMetallomics
    Volume4
    Issue number12
    DOIs
    Publication statusPublished - Dec 2012

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