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Related Experiment Videos

Apolipoprotein A-I mimetic peptides.

Mohamad Navab1, G M Anantharamaiah, Srinivasa T Reddy

  • 1Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, Calif 90095-1679, USA. mnavab@mednet.ucla.edu

Arteriosclerosis, Thrombosis, and Vascular Biology
|April 16, 2005
PubMed
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Subtle changes in the amino acid sequence of anti-inflammatory peptides like D-4F significantly impact their ability to reduce inflammation and atherosclerosis. In vivo studies showed D-4F effectively improved high-density lipoprotein function and reduced disease markers.

Area of Science:

  • Biochemistry
  • Cardiovascular Science
  • Immunology

Background:

  • Class A amphipathic helical peptides exhibit varying anti-inflammatory properties despite identical amino acid composition.
  • The specific arrangement of amino acids on the hydrophobic face dictates peptide efficacy.
  • Apolipoprotein A-I (apoA-I) mimetic peptide D-4F is a key example studied for its therapeutic potential.

Purpose of the Study:

  • To investigate the relationship between the structural configuration of class A amphipathic helical peptides and their anti-inflammatory and anti-atherosclerotic activities.
  • To evaluate the in vivo efficacy of the apoA-I mimetic peptide D-4F in animal models of atherosclerosis.
  • To determine predictive models for peptide efficacy, contrasting in vitro physical-chemical properties with cell-based assays.

Main Methods:

Related Experiment Videos

  • Administration of D-4F orally to mice and monkeys.
  • Assessment of high-density lipoprotein (HDL) properties, including cholesterol efflux and inflammatory status.
  • Evaluation of lipid hydroperoxides, paraoxonase activity, and reverse cholesterol transport in apolipoprotein E (apoE)-null mice.
  • Testing D-4F in vitro on human plasma and cultured human artery wall cells.
  • Comparison of in vitro biophysical-chemical properties with in vivo biological activity.

Main Results:

  • Oral D-4F administration induced pre-beta HDL formation, enhanced HDL-mediated cholesterol efflux, and reduced lipid hydroperoxides in vivo.
  • D-4F converted HDL from a pro-inflammatory to an anti-inflammatory state and increased paraoxonase activity.
  • In apoE-null mice, D-4F improved reverse cholesterol transport and significantly reduced atherosclerosis in both apoE-null and LDL receptor-null mice.
  • In vitro, D-4F demonstrated similar effects on HDL and lipid parameters at nanomolar concentrations.
  • In vitro physical-chemical properties and LCAT activation did not reliably predict in vivo efficacy, whereas cell-based assays were more predictive.

Conclusions:

  • The anti-inflammatory and anti-atherosclerotic effects of class A amphipathic helical peptides are critically dependent on subtle variations in their hydrophobic face configuration.
  • These structural nuances influence the peptides' ability to sequester inflammatory lipids, a mechanism not fully predictable by physical-chemical properties alone.
  • Cultured human artery wall cell assays offer a more reliable platform for predicting the in vivo efficacy of these therapeutic peptides compared to traditional in vitro methods.