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Early Transcriptomic Response to OxLDL in Human Retinal Pigment Epithelial Cells.

Diwa Koirala1, Sarka Beranova-Giorgianni1, Francesco Giorgianni1

  • 1Department of Pharmaceutical Sciences; The University of Tennessee Health Science Center, Memphis, TN 38163, USA.

International Journal of Molecular Sciences
|November 25, 2020
PubMed
Summary

Oxidized low-density lipoproteins (OxLDL) trigger a protective gene response in retinal pigment epithelium (RPE) cells, up-regulating antioxidant pathways while down-regulating lipid metabolism and circadian rhythm genes, crucial for understanding age-related macular degeneration.

Keywords:
drusenoxidative stressoxidized LDLretinal pigment epitheliumtranscriptome

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Molecular Biology

Background:

  • Deposits in the aging macula, including oxidized low-density lipoproteins (OxLDL), are implicated in age-related macular degeneration (AMD).
  • Retinal pigment epithelium (RPE) cells play a critical role in retinal health and are affected by oxidative stress in AMD.

Purpose of the Study:

  • To investigate the gene expression response of human RPE cells to oxidized low-density lipoproteins (OxLDL) and native low-density lipoproteins (LDL).
  • To elucidate the molecular mechanisms by which RPE cells respond to oxidative stress agents found in AMD.

Main Methods:

  • Exposure of a human RPE cell line to non-cytotoxic levels of OxLDL and LDL.
  • Gene expression analysis and pathway analysis to identify affected genes and networks.

Main Results:

  • OxLDL, but not LDL, induced significant gene expression changes in over 400 genes.
  • Upregulation of antioxidant (NRF2-controlled) and detoxifying (aryl hydrocarbon receptor-controlled) gene pathways.
  • Downregulation of circadian rhythm and lipid metabolism genes, suggesting potential disruption of RPE phagocytic activity and lipid homeostasis.

Conclusions:

  • RPE cells selectively respond to OxLDL by activating protective antioxidant and detoxification pathways.
  • OxLDL exposure leads to downregulation of genes involved in lipid metabolism and circadian rhythm, potentially impacting RPE function in AMD.
  • The findings highlight a complex cellular response to OxLDL, a key component of drusen in AMD.