Recombinant human antibodies against aldehyde-modified apolipoprotein B-100 peptide sequences inhibit atherosclerosis.

Abstract

BACKGROUND:

Accumulation and oxidation of LDL are believed to be important initiating factors in atherosclerosis. Oxidized LDL is recognized by the immune system, and animal studies have suggested that these immune responses have a protective effect against atherosclerosis. Aldehyde-modified peptide sequences in apolipoprotein B-100 (apoB-100) are major targets for these immune responses.

METHODS AND RESULTS:

Human IgG1 antibodies against 2 malondialdehyde (MDA)-modified apoB-100 peptide sequences were produced through screening of a single-chain antibody-fragment library and subsequent cloning into a pcDNA3 vector. Three weekly doses of these antibodies were injected into male apoE-/- mice. Phosphate-buffered saline and human IgG1 antibodies against fluorescein isothiocyanate were used as controls. One of the IgG1 antibodies significantly and dose-dependently reduced the extent of atherosclerosis as well as the plaque content of oxidized LDL epitopes and macrophages. In cell culture studies, human monocytes were incubated with native LDL or oxidized LDL, in the presence of antibodies. The same antibody induced an increase in monocyte binding and uptake of oxidized LDL.

CONCLUSIONS:

These findings suggest that antibodies are important mediators of atheroprotective immune responses directed to oxidized LDL. Thus, passive immunization against MDA-modified apoB-100 peptide sequences may represent a novel therapeutic approach for prevention and treatment of cardiovascular disease.

• Authors: Alexandru Schiopu, Jenny Bengtsson, Ingrid Söderberg, Sabina Janciauskiene, Stefan Lindgren, Mikko P S Ares, Prediman K Shah, Roland Carlsson, Jan Nilsson, Gunilla Nordin Fredrikson
• Journal: Circulation (Circulation) Vol. 110 Issue 14 Pg. 2047-52 (Oct 05 2004) ISSN: 1524-4539 [Electronic] United States
• PMID: 15451805 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Apolipoprotein B-100
• Apolipoproteins B
• Apolipoproteins E
• Immunoglobulin Fragments
• Immunoglobulin G
• Immunoglobulin Variable Region
• Immunoglobulin lambda-Chains
• Lipoproteins, LDL
• Peptide Fragments
• Recombinant Fusion Proteins
• oxidized low density lipoprotein
• Malondialdehyde

Topics

• Amino Acid Sequence
• Animals
• Apolipoprotein B-100
• Apolipoproteins B (chemistry, immunology)
• Apolipoproteins E (deficiency, genetics)
• Arteriosclerosis (pathology, prevention & control)
• Drug Evaluation, Preclinical
• Humans
• Immunization, Passive
• Immunoglobulin Fragments (genetics, immunology, therapeutic use)
• Immunoglobulin G (genetics, immunology, therapeutic use)
• Immunoglobulin Variable Region (genetics, immunology, therapeutic use)
• Immunoglobulin lambda-Chains (genetics)
• Lipoproteins, LDL (metabolism, pharmacology)
• Macrophages (pathology)
• Male
• Malondialdehyde (chemistry, immunology)
• Mice
• Mice, Knockout
• Molecular Sequence Data
• Monocytes (metabolism)
• Peptide Fragments (chemistry, immunology)
• Recombinant Fusion Proteins (immunology, therapeutic use)