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Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina
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Microglia increase as photoreceptors decrease in the aging avian retina.

K S Kunert1, M E Fitzgerald, L Thomson

  • 1Schepens Eye Research Institute and Department of Ophthalmology, Harvard Medical School, Boston, MA 02114, USA. kunert@vision.eri.harvard.edu

Current Eye Research
|August 6, 1999
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Summary
This summary is machine-generated.

Microglia activation in the retina increases with age, particularly in peripheral regions. In quail, this microglial response is directly linked to photoreceptor cell loss, suggesting a localized aging process.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Gerontology

Background:

  • Microglial activation is observed in the aging rodent brain.
  • The role of microglia in age-related retinal changes is not fully understood.

Purpose of the Study:

  • To investigate microglial patterns in the retinas of young and aged quail and pigeons.
  • To determine if age-related retinal changes cause microglial migration into the outer retina.
  • To examine the correlation between activated microglia and photoreceptor loss in quail.

Main Methods:

  • Microglia were identified using the monoclonal antibody QH1 in quail and pigeon retinal sections.
  • Rounded microglia in the photoreceptor layer were quantified.
  • Photoreceptor counts were performed in quail retina flat mounts.
  • Microglia counts were compared to photoreceptor numbers in corresponding retinal regions.

Main Results:

  • Rounded microglia were found among photoreceptors in both species.
  • Significantly more microglia were present in peripheral than central retinal regions.
  • Older quail and pigeons exhibited higher numbers of microglia compared to younger birds.
  • In older quail, microglial presence was inversely related to photoreceptor number.

Conclusions:

  • Increased microglial presence was observed in the peripheral retina of aged quail and pigeons.
  • In quail, activated microglia were concentrated in areas with significant photoreceptor loss.
  • Microglial activation is not a universal aging phenomenon in the retina but appears linked to photoreceptor loss in quail.
  • The neuroprotective or neurotoxic role of these microglial changes remains to be elucidated.