Retinal deimination and PAD2 levels in retinas from donors with age-related macular degeneration (AMD)

Vera L. Bonilha, Karen G. Shadrach, Mary E. Rayborn, Yong Li, Gayle J T Pauer, Stephanie A. Hagstrom, Sanjoy K Bhattacharya, Joe G. Hollyfield

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Deimination is a form of protein posttranslational modification carried out by the peptidyl arginine deiminases (PADs) enzymes. PAD2 is the principal deiminase expressed in the retina. Elevated levels of PAD2 and protein deimination are present in a number of human neurological diseases, with or without ocular manifestation. To define the association of deimination with the pathogenesis of age-related macular degeneration (AMD), we studied protein deimination and PAD2 levels in retinas of AMD donor eyes compared to age-matched non-AMD retinas. Eyes from non-AMD and AMD donors were fixed in 4% paraformaldehyde and 0.5% glutaraldehyde in phosphate buffer. Retina and retinal pigment epithelium (RPE) from donor eyes were processed for immunohistochemical detection and western blotting using antibodies to PAD2 and citrulline residues. The ganglion cell, inner plexiform, inner nuclear and outer nuclear layers were labeled by both PAD2 and citrulline antibodies. Changes in the localization of deiminated residues and PAD2 were evident as the retinal layers were remodeled coincident with photoreceptor degeneration in AMD retinas. Immunodetection of either PAD2 or citrulline residues could not be evaluated in the RPE layer due to the high autofluorescence levels in this layer. Interestingly, higher deimination immunoreactivity was detected in AMD retinal lysates. However, no significant changes in PAD2 were detected in the AMD and non-AMD retinas and RPE lysates. Our observations show increased levels of protein deimination but not PAD2 in AMD retinas and RPE, suggesting a reduced rate of turnover of deiminated proteins in these AMD retinas.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalExperimental Eye Research
Volume111
DOIs
StatePublished - Jun 1 2013

Fingerprint

Macular Degeneration
Retina
Retinal Pigment Epithelium
Citrulline
Proteins
Pigment Epithelium of Eye
Eye Manifestations
Antibodies
Glutaral
Post Translational Protein Processing
Ganglia
Buffers
Western Blotting
Phosphates

Keywords

  • AMD
  • Immunohistochemistry
  • Posttranslational modifications
  • Protein deimination
  • Retina
  • Retinal pigment epithelium

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Bonilha, V. L., Shadrach, K. G., Rayborn, M. E., Li, Y., Pauer, G. J. T., Hagstrom, S. A., ... Hollyfield, J. G. (2013). Retinal deimination and PAD2 levels in retinas from donors with age-related macular degeneration (AMD). Experimental Eye Research, 111, 71-78. https://doi.org/10.1016/j.exer.2013.03.017

Retinal deimination and PAD2 levels in retinas from donors with age-related macular degeneration (AMD). / Bonilha, Vera L.; Shadrach, Karen G.; Rayborn, Mary E.; Li, Yong; Pauer, Gayle J T; Hagstrom, Stephanie A.; Bhattacharya, Sanjoy K; Hollyfield, Joe G.

In: Experimental Eye Research, Vol. 111, 01.06.2013, p. 71-78.

Research output: Contribution to journalArticle

Bonilha, Vera L. ; Shadrach, Karen G. ; Rayborn, Mary E. ; Li, Yong ; Pauer, Gayle J T ; Hagstrom, Stephanie A. ; Bhattacharya, Sanjoy K ; Hollyfield, Joe G. / Retinal deimination and PAD2 levels in retinas from donors with age-related macular degeneration (AMD). In: Experimental Eye Research. 2013 ; Vol. 111. pp. 71-78.
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