Cited by 595Parkinson's Disease Mechanisms and TreatmentsNeuroinflammation and Neurodegeneration MechanismsNuclear Receptors and Signaling

Nitric oxide synthase and neuronal vulnerability in parkinson's disease

Hunot, S., Boissière, F., Faucheux, B., Brugg, B., Mouatt-Prigent, A., Agid, Y., Hirsch, E.C.·1996·Neuroscience

Abstract

Parkinson's disease is characterized by a loss of dopaminergic neurons in the mesencephalon. Although the mechanism of this neuronal loss is still unknown, oxidative stress is very likely involved in the cascade of events leading to nerve cell death. Since nitric oxide could be involved in the production of free radicals, we analysed, using immunohistochemistry and histochemistry, the production systems of nitric oxide in the mesencephalon of four patients with idiopathic Parkinson's disease and three matched control subjects. Using specific antibodies directed against the inducible isoform of nitric oxide synthase (the enzyme involved in the synthesis of nitric oxide), we found evidence to suggest that this isoform was present solely in glial cells displaying the morphological characteristics of activated macrophages. Immunohistochemical analysis performed with antibodies against the neuronal isoform of nitric oxide synthase, however, revealed perikarya and processes of neurons but no glial cell staining. The number of nitric oxide synthase-containing cells was investigated by histoenzymology, using the NADPH-diaphorase activity of nitric oxide synthase. Histochemistry revealed (i) a significant increase in NADPH-diaphorase-positive glial cell density in the dopaminergic cell groups characterized by neuronal loss in Parkinson's disease and (ii) a neuronal loss in Parkinson's disease that was two-fold greater for pigmented NADPH-diaphorase-negative neurons than for pigmented NADPH-diaphorase-positive neurons. These data suggest a potentially deleterious role of glial cells producing excessive levels of nitric oxide in Parkinson's disease, which may be neurotoxic for a subpopulation of dopaminergic neurons, especially those not expressing NADPH-diaphorase activity. However, it cannot be excluded that the presence of glial cells expressing nitric oxide synthase in the substantia nigra of patients with Parkinson's disease represents a consequence of dopaminergic neuronal loss.

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Crossref · 10.1016/0306-4522(95)00578-1

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  • Analysis of post-mortem human brain samples revealed increased levels of iNOS in PD.

    “Analysis of post-mortem human brain samples revealed increased levels of iNOS PD.460”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [460]

  • Microglial activation markers such as iNOS, COX, and CD68 are upregulated in PD patients.

    “Other microglial activation markers, such as pro-inflammatory enzymes like iNOS and COX211,212 and phagocytosis-associated marker CD68,213 were also upregulated in PD patients.”

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Authors
Hunot, S., Boissière, F., Faucheux, B., Brugg, B., Mouatt-Prigent, A., Agid, Y., & Hirsch, E. C.
Affiliations
Inserm (FR)
Venue
Neuroscience
Publisher
Elsevier BV
Published
1996-05
Volume
72
Issue
2
Pages
355-363
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2006497054
Cited by
595
References
58
Citations by year
2026: 5 · 2025: 11 · 2024: 6 · 2023: 14 · 2022: 23 · 2021: 16 · 2020: 12 · 2019: 13 · 2018: 18 · 2017: 17 · 2016: 26 · 2015: 24 · 2014: 32 · 2013: 25 · 2012: 32
FWCI
11.15
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
Keywords
Parkinson's disease, nitric oxide synthase, inducible nitric oxide synthase, neuronal vulnerability, dopaminergic neuron loss, substantia nigra, glial cells, macrophage activation, NADPH-diaphorase, oxidative stress, neurotoxicity, free radicals
MeSH terms
Aged, Aged, 80 and over, Animals, Female, Humans, Image Processing, Computer-Assisted, Immunohistochemistry, Male, Mesencephalon, Mice, Inbred C57BL, Middle Aged, NADPH Dehydrogenase, Neurons, Parkinson Disease, Macrophages, Peritoneal, Nitric Oxide Synthase, Mice, In Vitro Techniques

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