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Nitric oxide synthase in chick embryo retina during development

R Ientile1, B Malecka, V Picciurro

  • 1Institute of Biochemical Sciences and Clinical Biochemistry, Faculty of Medicine, University of Messina, Italy.

FEBS Letters
|January 22, 1996
PubMed
Summary

Nitric oxide synthase is present in early chick embryo retinas, decreasing as development progresses. This suggests nitric oxide acts as a crucial signal for neural cell development before connections form.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Biochemistry

Background:

  • Nitric oxide (NO) is a signaling molecule implicated in various physiological processes.
  • Understanding NO's role in early neural development is crucial for comprehending cellular differentiation and network formation.

Purpose of the Study:

  • To investigate the presence and activity of nitric oxide synthase (NOS) during chick embryo retina development.
  • To determine if nitric oxide production precedes synaptogenesis in the developing retina.
  • To explore the potential role of NMDA receptor activation in modulating NO synthesis.

Main Methods:

  • Assessed nitric oxide synthase activity in chick embryo retinas at various developmental stages.
  • Incubated retinas with N-methyl-D-aspartate (NMDA) to observe effects on NO synthesis.

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Main Results:

  • High levels of nitric oxide synthase were detected in early-stage chick embryo retinas.
  • Enzyme activity significantly decreased by day 13 of embryonic development.
  • NMDA incubation led to increased nitric oxide synthesis in developing retinas.

Conclusions:

  • Nitric oxide is synthesized in the chick embryo retina prior to the formation of synapses.
  • The observed NO production pattern suggests its role as an early developmental signal.
  • NO may play a role in the development and organization of both neuronal and non-neuronal cells in the retina and brain.