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Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation
06:47

Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation

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DYRK1A overexpression decreases plasma lecithin:cholesterol acyltransferase activity and apolipoprotein A-I levels

Asma Tlili1, Christophe Noll, Sandrine Middendorp

  • 1Université Paris Diderot, Sorbonne Paris Cité, Unit of Functional and Adaptive Biology (BFA), EAC-CNRS 4413, Case 7104, 75205 Paris cedex 13, France.

Molecular Genetics and Metabolism
|August 8, 2013
PubMed
Abstract

Insights

Overexpression of DYRK1A kinase in Down syndrome alters lipoprotein metabolism. This leads to decreased lecithin:cholesterol acyltransferase activity and lower high-density lipoprotein-cholesterol levels.

Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Down syndrome is linked to chromosome 21 abnormalities.
  • Individuals with Down syndrome exhibit altered lipoprotein metabolism, including reduced high-density lipoprotein (HDL) levels.
  • DYRK1A kinase is overexpressed in Down syndrome and influences pathways regulating lipid metabolism.

Purpose of the Study:

  • To investigate the impact of DYRK1A overexpression on lecithin:cholesterol acyltransferase (LCAT) activity and expression.
  • To elucidate the role of DYRK1A in regulating lipoprotein metabolism in a mouse model.

Main Methods:

  • Examined the effects of Dyrk1a gene overexpression in mice.
  • Utilized ELISA, chemical analyses, and Western blotting to assess molecular and biochemical changes.

Main Results:

  • DYRK1A overexpression reduced plasma LCAT activity and hepatic STAT3 activation.
  • Decreased hepatic and plasma apolipoprotein A-I levels were observed.
  • Plasma HDL-cholesterol levels were reduced, while total and non-HDL cholesterol remained similar.

Conclusions:

  • DYRK1A overexpression significantly impacts lipoprotein metabolism.
  • The study identified DYRK1A as a key factor in the altered lipid profiles seen in Down syndrome.
Keywords:
ApoBACBSADSDYRKsDown syndromeESHDLHRPHSA21LCATLipoprotein metabolismQ-PCRSHP2STAT3Tyrosine phosphorylationapolipoproteinbacterial artificial chromosomebovine serum albumindual-specificity tyrosine-(Y)-phosphorylation regulated kinasesembryonic stemhigh-density lipoproteinhorseradish peroxidasehuman chromosome 21lecithin:cholesterol acyltransferasequantitative reverse-transcription polymerase chain reaction

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