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Related Experiment Videos

Protein chip-based microarray profiling of oxidized low density lipoprotein-treated cells.

Sergiy Sukhanov1, Patrick Delafontaine

  • 1Tulane University Health Sciences Center, New Orleans, LA 70112, USA.

Proteomics
|February 26, 2005
PubMed
Summary

Oxidized low-density lipoprotein (OxLDL) alters human aortic smooth muscle cell functions. Protein microarrays reveal OxLDL up-regulates cell-cell interaction molecules while down-regulating biosynthesis and structural proteins, impacting atherosclerosis development.

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Area of Science:

  • Proteomics
  • Cell Biology
  • Cardiovascular Research

Background:

  • Atherosclerosis is a complex disease involving lipid accumulation and inflammation in artery walls.
  • Oxidized low-density lipoprotein (OxLDL) is a key pro-atherogenic molecule implicated in smooth muscle cell dysfunction.
  • Understanding OxLDL's impact on smooth muscle cells is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the global proteomic changes in human aortic smooth muscle cells upon exposure to OxLDL.
  • To compare proteomic data with gene expression data to understand the overall effect of OxLDL on cellular functions.
  • To evaluate the utility of protein microarrays in profiling disease-related states in muscle cells.

Main Methods:

  • Utilized commercially available (Ab380) and homemade (DLM26) protein microarrays to profile protein expression.

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  • Analyzed protein expression in human aortic smooth muscle cells treated with OxLDL.
  • Validated microarray findings using immunoblotting for selected proteins.
  • Integrated proteomic data with existing cDNA microarray-based gene expression data.

    • Main Results:

    • Protein microarrays detected 298 proteins, with 54 showing differential regulation in response to OxLDL.
    • OxLDL treatment led to the up-regulation of cell-cell interaction molecules.
    • Nucleic acid/protein biosynthesis, structural, and humoral response proteins/genes were found to be under-expressed.
    • Proteomic and gene expression data revealed consistent patterns of OxLDL-induced cellular changes.

    Conclusions:

    • OxLDL significantly alters the proteome of human aortic smooth muscle cells, impacting key cellular functions.
    • Protein microarrays serve as a valuable tool for proteomic profiling in disease states like atherosclerosis.
    • The identified protein changes provide insights into OxLDL-mediated smooth muscle cell dysfunction and potential therapeutic targets.