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Related Experiment Videos

11-cis retinal restores visual function in vitamin A-deficient Manduca.

R R Bennett1, R H White

  • 1Department of Biology, University of Massachusetts, Boston 02125.

Visual Neuroscience
|May 1, 1991
PubMed
Summary

Carotenoid deficiency in Manduca sexta moths impairs vision by reducing rhodopsin. Supplementing with retinaldehyde (R1) rapidly restores visual sensitivity and function in deprived moths.

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Area of Science:

  • Entomology
  • Neuroscience
  • Biochemistry

Background:

  • Carotenoids are essential dietary pigments for visual function in many animals.
  • The tobacco hornworm moth (Manduca sexta) relies on carotenoids for visual pigment chromophore synthesis.

Purpose of the Study:

  • To characterize retinoids in Manduca sexta retinas under different dietary conditions.
  • To investigate the recovery of visual function in carotenoid-deprived moths supplemented with retinaldehyde.

Main Methods:

  • Larvae reared on carotenoid-supplemented or deficient diets.
  • Retinoid identification and quantification using high-performance liquid chromatography (HPLC).
  • Visual sensitivity recovery assessed after topical application of retinaldehyde isomers.

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Main Results:

  • Carotenoid-deficient moths exhibited reduced visual sensitivity and rhodopsin content.
  • 3-hydroxyretinaldehyde (R3) identified as the primary photopigment chromophore in fortified moths.
  • 11-cis retinaldehyde (R1) application rapidly restored visual sensitivity in deprived moths, though not to fully fortified levels.

Conclusions:

  • Dietary carotenoids are crucial for maintaining visual function in Manduca sexta.
  • Retinaldehyde serves as a vital precursor for photopigment regeneration.
  • Visual recovery is dependent on the isomer of applied retinaldehyde, highlighting the importance of 11-cis R1.