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Age-related decrease in rod bipolar cell density of the human retina: an immunohistochemical study.

P Aggarwal1, T C Nag, S Wadhwa

  • 1Department of Anatomy, All India Institute of Medical Sciences, New Delhi 110029, India.

Journal of Biosciences
|April 17, 2007
PubMed
Summary
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Rod bipolar cell density in the human retina declines significantly with age after 35 years. This age-related decrease in rod bipolar cells, crucial for vision, impacts retinal health.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Background:

  • Normal aging in the human retina involves a decrease in rod photoreceptor density starting from the fourth decade.
  • Rod cells synapse with rod bipolar cells, suggesting that a decline in rod density may lead to a subsequent decrease in rod bipolar cell numbers.

Purpose of the Study:

  • To investigate age-related changes in the density of rod bipolar cells in the human retina.
  • To determine if rod bipolar cell density declines with increasing age.

Main Methods:

  • Utilized donor human eyes aged 6 to 91 years.
  • Processed retinal sections using immunohistochemistry for protein kinase C-alpha, a selective marker for rod bipolar cells.
  • Quantified the density of immunopositive rod bipolar cells in the mid-peripheral retina.

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Main Results:

  • Rod bipolar cell density remained relatively stable between ages 6 and 35 years (2.2% change).
  • A significant decline of approximately 21% in rod bipolar cell density was observed between ages 35 and 62 years.
  • Further decline of about 27% was noted between the seventh and tenth decades of life.

Conclusions:

  • Rod bipolar cell density decreases notably with advancing age in the human retina, particularly after middle age.
  • This age-dependent loss of rod bipolar cells may have implications for visual function in older individuals.
  • Protein kinase C-alpha immunohistochemistry is an effective method for assessing rod bipolar cell density in aging retinas.