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Related Experiment Videos

A fluorescence-based method for analyzing retinoic acid in biological samples.

Leslie J Donato1, Noa Noy

  • 1Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA.

Analytical Biochemistry
|August 22, 2006
PubMed
Summary

This study introduces a novel fluorescence assay for quantifying retinoic acid (RA) using cellular retinoic acid-binding proteins (CRABP) as sensors. This sensitive method allows for direct measurement of RA in biological samples, aiding research and clinical applications.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Retinoic acid (RA) is crucial for gene transcription and biological processes, but its therapeutic use is limited by toxicity.
  • Accurate quantification of RA in biological samples is needed to overcome therapeutic challenges.

Purpose of the Study:

  • To develop a sensitive fluorescence-based method for quantifying retinoic acid (RA).
  • To utilize cellular retinoic acid-binding proteins (CRABP-I and CRABP-II) as RA sensors.

Main Methods:

  • Generation of L28C CRABP mutants.
  • Covalent labeling of cysteine with an environmentally sensitive fluorescent probe.
  • Monitoring fluorescence changes upon RA binding to CRABP.

Main Results:

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  • RA binding induced distinct changes in fluorescence, enabling direct RA quantitation.
  • The method successfully monitored RA biosynthesis from retinal in cultured cells.
  • Exogenous RA in serum was detected, demonstrating assay versatility.

Conclusions:

  • The developed fluorescence assay offers ease of use and high sensitivity for RA quantitation.
  • This method is suitable for analyzing limited biological sample sizes.
  • The assay holds significant potential for diverse research and clinical applications.