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Decrease of opsin content in the developing rat photoreceptor cells by systemic administration of L-glutamate.

C Kanno1, S Ishiguro, T Shiono

  • 1Department of Ophthalmology, Tohoku University School of Medicine, Sendai, Japan.

Cell Structure and Function
|October 1, 1991
PubMed
Summary
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Systemic L-glutamate administration impacts developing photoreceptor cells, significantly decreasing opsin expression in rats. This effect is most pronounced when glutamate is administered during early development, before the blood-retinal barrier matures.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • L-glutamate is a neurotransmitter in photoreceptor cells and is used to isolate these cells.
  • Potential effects of inner retinal layer absence or direct glutamate impact on photoreceptor cells are unknown.

Purpose of the Study:

  • To quantitatively assess the effects of L-glutamate on developing photoreceptor cells.
  • To measure opsin expression, a specific protein in rod photoreceptor cells, following glutamate administration.

Main Methods:

  • Purified rat rhodopsin was used as a standard for opsin measurement via competitive enzyme-linked immunosorbent assay.
  • Rats received subcutaneous injections of L-glutamate at various concentrations and developmental stages.
  • Retinal changes and opsin content were analyzed on postnatal day 14 using light microscopy and ELISA.

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Main Results:

  • Subcutaneous administration of L-glutamate (10-15 μL of 2.4 M/g body weight) caused inner retinal layer degeneration.
  • Opsin content significantly decreased in glutamate-treated retinas compared to controls.
  • Glutamate administration between postnatal days 1-7 led to inner retina degeneration and reduced opsin, while administration on days 1-2 or after day 13 had no significant effect.

Conclusions:

  • Systemic L-glutamate administration negatively affects opsin expression in developing rod photoreceptor cells.
  • The developmental stage, particularly before the maturation of the blood-retinal barrier around postnatal day 13, is critical for glutamate's impact on photoreceptor cells.