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Author Spotlight: Investigating Physiological Functions of Vitamin A Transporters Using HPLC-Based Vitamin A Profiling
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Tracking Systemic and Ocular Vitamin A.

Diego Montenegro1, Jin Zhao1, Hyejin Kim1

  • 1Department of Ophthalmology, Columbia University Medical Center, 701 W., 168th St, New York, NY 10032, USA.

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|January 28, 2026
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Summary
This summary is machine-generated.

Vitamin A (retinaldehyde) is crucial for vision. Supplementation is key, but excess can cause retinal issues. This study explores vitamin A uptake and bisretinoid levels in mice under different feeding and light conditions.

Keywords:
bisretinoidsretinaretinoidsvitamin A

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Area of Science:

  • Ophthalmology
  • Nutritional Science
  • Biochemistry

Background:

  • 11-cis-retinaldehyde, a form of vitamin A, is essential for vision.
  • Vitamin A deficiency requires supplementation, while excess can lead to retinal diseases.
  • Bisretinoids, like A2E, accumulate in the retina and are linked to photoreceptor damage.

Purpose of the Study:

  • To measure systemic and ocular uptake of vitamin A and bisretinoids.
  • To investigate the impact of dietary versus injected vitamin A on retinoid levels.
  • To assess the influence of light exposure on retinoid metabolism and bisretinoid accumulation.

Main Methods:

  • Mice were reared in light or darkness and received vitamin A via diet or intraperitoneal injection.
  • Plasma and ocular retinoid levels (11-cis-retinaldehyde, atRAL, atRE) were quantified.
  • Bisretinoid (A2E) levels were measured in ocular tissues.

Main Results:

  • Intraperitoneal retinyl palmitate increased plasma ROL but not ocular 11-cis-retinaldehyde.
  • Dietary retinyl palmitate was more effective for ocular 11-cis-retinaldehyde in dark-reared mice.
  • Ocular atRAL increased with i.p. retinyl palmitate in dark-reared mice.
  • Liver atRE and ocular 11-cis-retinaldehyde were elevated with dietary retinyl palmitate in dark-reared mice.
  • Ocular atRE increased with i.p. retinyl palmitate in light-reared mice.
  • Bisretinoid levels were not affected by retinyl palmitate but were lower in light-exposed mice due to photooxidation.
  • Sustained darkness elevated ocular atRAL.

Conclusions:

  • Dietary vitamin A intake influences ocular retinoid levels differently than injections.
  • Plasma vitamin A levels do not reliably predict ocular retinoid or bisretinoid concentrations.
  • Light exposure significantly reduces bisretinoid accumulation through photooxidation, impacting retinal health.