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Related Experiment Videos

RAR and RXR expression by Kupffer cells.

M Ohata1, M Yamauchi, K Takeda

  • 1First Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan.

Experimental and Molecular Pathology
|January 21, 2000
PubMed
Summary

This study reveals that retinoic acid (RA) signaling occurs at the nuclear level in Kupffer cells. Kupffer cells express RA receptors (RARs) and retinoid X receptors (RXRs), demonstrating functional RA signaling pathways.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Retinoids, vitamin A metabolites, influence macrophage functions.
  • Retinoic acid (RA) signaling in Kupffer cells, liver-resident macrophages, remains uncharacterized.

Purpose of the Study:

  • To investigate the presence and function of RA receptors in rat Kupffer cells.
  • To characterize RA signaling pathways at the nuclear level in Kupffer cells.

Main Methods:

  • Extraction of total RNA and nuclear proteins from isolated rat Kupffer cells.
  • Competitive PCR to quantify RAR and RXR subtype mRNA expression.
  • Gel mobility shift assays to assess RARE and RXRE binding activities.

Main Results:

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  • Kupffer cells express RAR and RXR subtypes, with specific expression orders (RAR: beta>alpha>gamma; RXR: alpha>beta>gamma).
  • RXR alpha and beta mRNA levels are significantly higher in Kupffer cells compared to hepatic stellate cells.
  • Nuclear extracts exhibit binding activity to RARE and RXRE, confirmed by supershift assays involving RARalpha and RXRalpha antibodies.

    • Conclusions:

    • This study provides the first evidence of RA nuclear signaling in Kupffer cells.
    • Kupffer cells possess functional RAR and RXR receptors capable of binding to specific DNA elements.
    • These findings elucidate a novel mechanism for retinoid action in liver macrophages.