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Retinal function and structure in the hypotransferrinemic mouse.

Michal Lederman1, Alexey Obolensky, Michelle Grunin

  • 1Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.

Investigative Ophthalmology & Visual Science
|December 14, 2011
PubMed
Summary
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Reduced retinal transferrin production in hypotransferrinemic mice did not affect retinal structure or iron levels. However, retinal function and iron homeostasis gene expression were significantly altered, indicating impaired iron regulation despite systemic treatment.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Transferrin is a key iron carrier protein crucial for normal retinal function.
  • Elevated transferrin levels are observed in the retina, particularly during degeneration.
  • The precise role of endogenous retinal transferrin in maintaining retinal health is not fully understood.

Purpose of the Study:

  • To investigate the consequences of genetically reduced retinal transferrin production on retinal structure and function.
  • To assess the impact of impaired iron transport on retinal health in vivo.
  • To explore the compensatory mechanisms in response to low retinal transferrin.

Main Methods:

  • Utilized hypotransferrinemic (HPX⁻/⁻) mice, treated with systemic transferrin.
  • Evaluated retinal function using electroretinography and ophthalmoscopy.

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  • Assessed retinal histology, iron content, transferrin levels, and gene expression related to iron homeostasis and oxidative stress.

    • Main Results:

    • HPX⁻/⁻ mice showed significantly reduced b-wave amplitudes and suppressed oscillatory potentials, indicating impaired retinal function.
    • Retinal transferrin content was reduced by 39% in HPX⁻/⁻ mice.
    • While retinal structure and iron content were preserved, mRNA levels of iron homeostasis genes were altered, and antioxidant gene expression was elevated.

    Conclusions:

    • Systemic transferrin administration maintained normal retinal morphology and iron content in HPX⁻/⁻ mice up to 2 months of age.
    • Despite structural preservation, retinal function was significantly compromised in mice with reduced endogenous retinal transferrin.
    • These findings highlight the critical role of intrinsic retinal transferrin in maintaining normal retinal function and suggest alterations in iron regulatory pathways.