Low nitric oxide synthases (NOSs) in eyes with age-related macular degeneration (AMD)

Imran A. Bhutto, Takayuki Baba, Carol Merges, D. Scott McLeod, Gerard Anthony Lutty

Research output: Contribution to journalArticle

Abstract

Nitric oxide (NO) production by vascular endothelium is important in regulation of blood flow. Reduced production of NO can adversely affect blood flow and other vascular functions. We investigated the expression of three nitric oxide synthase (NOS) isoforms in retina and choroid of aged human eyes and eyes with AMD. Alkaline phosphatase immunohistochemistry was performed using antibodies against inducible (iNOS), neuronal (nNOS), and endothelial (eNOS) NOSs on cryopreserved sections from aged control donor eyes (n = 13) and eyes with AMD (n = 22). CD34 antibody was used as an endothelial cell (EC) marker. Three independent masked observers scored the intensity of the immunohistochemical reaction product. Mean scores from the aged control and AMD eyes were statistically compared. In aged control retinas, nNOS was in ganglion cells (RGCs) and neurons of both nuclear layers. In choroid, perivascular nerve fibers and retinal pigment epithelial (RPE) cells were nNOS+. eNOS and iNOS were confined to the retinal and choroidal vascular ECs. Some cells presumably melanocytes or dendritic cells in choroid were also eNOS+. In AMD eyes, nNOS was significantly lower in RGCs, neurons, retinal vessels and RPE (p ≤ 0.05) compared to the aged control eyes. iNOS and eNOS showed no significant differences between aged control and AMD eyes except that there was significantly less eNOS in choroidal arteries (p = 0.006) and choroidal cells (p = 0.03) of AMD eyes. Although NO was not measured directly, these findings suggest that there is less NO produced in AMD eyes. The decrease in retinal nNOS in AMD eyes is probably related to neuronal degeneration. The decrease in nNOS and eNOS in AMD choroid could be associated with vasoconstriction and hemodynamic changes.

Original languageEnglish (US)
Pages (from-to)155-167
Number of pages13
JournalExperimental Eye Research
Volume90
Issue number1
DOIs
StatePublished - Jan 2010

Fingerprint

Macular Degeneration
Nitric Oxide Synthase
Choroid
Nitric Oxide
Retina
Retinal Vessels
Retinal Pigments
Ganglia
Neurons
Antibodies
Nitric Oxide Synthase Type III
Melanocytes
Vascular Endothelium
Vasoconstriction
Nerve Fibers
Dendritic Cells
Alkaline Phosphatase
Blood Vessels
Protein Isoforms
Endothelial Cells

Keywords

  • age-related macular degeneration
  • choriocapillaris
  • neurons
  • nitric oxide synthases
  • retinal endothelial cells
  • retinal pigment epithelium

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Low nitric oxide synthases (NOSs) in eyes with age-related macular degeneration (AMD). / Bhutto, Imran A.; Baba, Takayuki; Merges, Carol; McLeod, D. Scott; Lutty, Gerard Anthony.

In: Experimental Eye Research, Vol. 90, No. 1, 01.2010, p. 155-167.

Research output: Contribution to journalArticle

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