July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Molecular similarities and differences between human and rat retinas in glaucoma
Author Affiliations & Notes
  • Mehdi Mirzaei
    Clinical Medicine , Macquarie University , Sydney, New South Wales, Australia
    Molecular Sciences , Macquarie University , Sydney, New South Wales, Australia
  • Vivek Kumar Gupta
    Clinical Medicine , Macquarie University , Sydney, New South Wales, Australia
  • Nitin Chitranshi
    Clinical Medicine , Macquarie University , Sydney, New South Wales, Australia
  • Yunqi Wu
    Clinical Medicine , Macquarie University , Sydney, New South Wales, Australia
  • Stuart L Graham
    Clinical Medicine , Macquarie University , Sydney, New South Wales, Australia
  • Footnotes
    Commercial Relationships   Mehdi Mirzaei, None; Vivek Kumar Gupta, None; Nitin Chitranshi, None; Yunqi Wu, None; Stuart Graham, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 3531. doi:
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    • Get Citation

      Mehdi Mirzaei, Vivek Kumar Gupta, Nitin Chitranshi, Yunqi Wu, Stuart L Graham; Molecular similarities and differences between human and rat retinas in glaucoma
      . Invest. Ophthalmol. Vis. Sci. 2018;59(9):3531.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Glaucoma is a progressive neurodegenerative disease of the eye characterised by progressive loss of retinal ganglion cells (RGCs) in the inner retina. The molecular mechanism(s) that result in RGC dysfunction in various optic neuropathies, however, remain ill-defined. This study was aimed to investigate the molecular basis of glaucoma pathogenesis by taking a systems-level perspective of the human retinal proteome and compare it with experimental glaucoma animal model using unbiased quantitative proteomics approaches.

Methods : Multiplexed Tandem Mass Tag based proteomics (TMT-MS3) was carried out on retinal and vitreous humour collected from glaucoma patients and age-matched controls (average ages: control 64.5 ± 10, n = 10 and glaucoma: 71.5 ± 8.5, n = 10, respectively). A rat model of glaucoma was generated using weekly microbead injections into the anterior chamber of the eye to help increase the intraocular pressure (n: 10). The differentially expressed proteins identified based on a two-sample t-test (p < 0.05) and a fold change threshold (≥1.3 for up-regulation or ≤0.76 for down-regulation). Finally, selected markers were validated using western blotting and electrochemiluminescence assay.

Results : About 5000 proteins were quantified from both the human and experimental glaucoma model. Pathway analyses of differentially regulated proteins indicated specific activation of classical complement pathway (up-regulation of C1q, C1s, C1r, C4a, C4b, C3, C5, C6, C7, C8a, C8b, C8g and C9 proteins) and cholesterol metabolism (up-regulation of APOA1, APOA4, APOC1, APOC3, APOH, APOB, APOE, APOL1, APOM, APOA2, APOL2 and APOC2 proteins) in human glaucoma retinas specifically suggesting an innate inflammatory response. Molecular dysregulation of oxidative phosphorylation (down-regulation of electron transport chain complex proteins), protein folding (down-regulation of crystalline proteins) and glutathione biosynthesis pathways (up-regulation of GSTs), were identified in both human and animal glaucoma model.


Conclusions : The most comprehensive profile of the eye proteome from human and experimental glaucoma identified in this study provides novel insights into the molecular pathobiology of glaucoma. Similarities and differences between various protein networks in human and experimental model may lead to the development of novel drug targets and disease specific biomarker identification in glaucoma.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

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