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The lysine-binding function of Lp(a)

N W Boonmark1, R M Lawn

  • 1Falk Cardiovascular Research Center, Stanford University School of Medicine, CA 94305-5246, USA.

Clinical Genetics
|March 31, 1998
PubMed
Summary

Lipoprotein(a) (Lp(a)) contributes to atherosclerosis by binding to fibrin via apolipoprotein(a). Disrupting this binding site significantly reduces lipid lesions in mice, highlighting Lp(a) as a key factor in cardiovascular disease.

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Area of Science:

  • Biochemistry
  • Cardiovascular Biology
  • Genetics

Background:

  • Lipoprotein(a) (Lp(a)) is implicated in atherosclerosis.
  • Its atherogenicity is linked to apolipoprotein(a) (apo(a)) binding to fibrin and plasminogen substrates.
  • Apo(a) binding can impair plasminogen activation, reducing fibrinolysis and TGF-beta activation.

Purpose of the Study:

  • To investigate the role of the lysine-binding site in apo(a) in Lp(a) atherogenicity.
  • To determine the impact of disrupting apo(a) binding on lipid lesion development and apo(a) deposition.

Main Methods:

  • Site-directed mutagenesis to abolish the lysine-binding site in apo(a).
  • Generation of transgenic mouse models expressing wild-type and mutant apo(a).
  • Comparison of lipid lesion development and apo(a) deposition in aorta among transgenic and non-transgenic mice.

Main Results:

  • Mutagenesis successfully destroyed the lysine-binding site of apo(a).
  • Transgenic mice expressing wild-type apo(a) showed a 5-fold increase in lipid lesions.
  • Significant focal deposition of apo(a) was observed in the aorta of wild-type apo(a) expressing mice, but not in mutant or non-transgenic mice.

Conclusions:

  • The lysine-binding site of apo(a) is crucial for Lp(a) atherogenicity.
  • Disruption of this binding site attenuates Lp(a)-driven atherosclerosis.
  • Understanding apo(a) function provides insights into cardiovascular disease mechanisms.

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