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Temporal disparity in pineal and retinal ontogeny.

T Ostholm1, P Ekström, A Bruun

  • 1Department of Zoology, University of Lund, Sweden.

Brain Research
|July 1, 1988
PubMed
Summary

Photoreceptor cells develop earlier in the pineal organ than the retina, while neurons develop concurrently in both structures during embryogenesis in the three-spined stickleback.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Ophthalmology

Background:

  • The pineal organ and retina are crucial sensory structures with distinct roles.
  • Understanding their developmental timelines is key to comprehending visual system formation.
  • Embryonic development of these organs involves the differentiation of photoreceptors and neurotransmitter systems.

Purpose of the Study:

  • To investigate the developmental timing of photoreceptor and neurotransmitter systems in the pineal organ and retina of the three-spined stickleback (Gasterosteus aculeatus L.).
  • To establish a developmental timetable for the appearance of specific cell types and markers.
  • To compare the developmental trajectories of neurons and photoreceptors between the pineal organ and retina.

Main Methods:

  • Immunocytochemistry was employed using specific antisera against photoreceptor markers: alpha-transducin (TD alpha) and S-antigen (SA).
  • Neurotransmitter system development was assessed using antisera against L-glutamic acid decarboxylase (GAD), gamma-aminobutyric acid (GABA), and choline-O-acetyltransferase (ChAT).
  • Acetylcholinesterase (AChE) histochemistry was used to identify cholinergic neurons.

Main Results:

  • Acetylcholinesterase (AChE) activity and TD alpha- and SA-immunoreactive cells appeared first in the pineal organ.
  • GAD- and GABA-immunoreactive cells emerged in both the pineal organ and retina subsequently.
  • ChAT immunoreactivity and AChE activity were detected in the retina, followed by SA-immunoreactive cells in the retina after hatching.

Conclusions:

  • Photoreceptor cells differentiate significantly earlier in the pineal organ compared to the retina.
  • Neuronal development, indicated by GAD, GABA, ChAT, and AChE markers, occurs concurrently in both the pineal organ and retina.
  • These findings provide insights into the differential and coordinated developmental strategies of sensory organs in fish embryos.

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