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Characterization of three human apolipoprotein E isoforms (E2, E3 and E4) expressed in Escherichia coli
A Barbier1, A Visvikis, F Mathieu
1Centre du Médicament, Université de Nancy 1 H. Poincaré, URA CNRS 597, France.
European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|August 1, 1997
Summary
Researchers produced three human apolipoprotein E (ApoE) isoforms using E. coli. These recombinant ApoE isoforms demonstrated biological functions similar to native human ApoE, aiding cholesterol metabolism research.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Apolipoprotein E (ApoE) plays a crucial role in cholesterol metabolism.
- Three major human ApoE isoforms (E2, E3, E4) exist, encoded by different alleles.
- The ApoE epsilon 4 allele is linked to increased risk of cardiovascular and Alzheimer's diseases.
Purpose of the Study:
- To produce recombinant human apolipoprotein E isoforms via heterologous expression in E. coli.
- To characterize the biological properties of the produced recombinant ApoE isoforms for research and clinical applications.
Main Methods:
- Heterologous expression of three human apolipoprotein E isoforms in Escherichia coli.
- Purification of recombinant apolipoprotein E isoforms.
- Surface Plasmon Resonance (SPR) to assess antibody binding.
- Receptor binding studies using VLDL from ApoE knockout mice and J774 macrophages.
Main Results:
- Purified recombinant ApoE isoforms showed high affinity for anti-ApoE monoclonal antibodies, comparable to native human ApoE.
- Recombinant ApoE isoforms efficiently associated with mouse VLDL, though less so than human ApoE3.
- Recombinant ApoE3-VLDL and ApoE4-VLDL complexes competed with LDL for LDL receptor binding in macrophages, unlike ApoE2-VLDL complexes.
Conclusions:
- The heterologous expression system successfully produced functional apolipoprotein E isoforms.
- Recombinant ApoE isoforms exhibit biological activities mirroring those of native human ApoE isoforms.
- These findings support the utility of recombinant ApoE isoforms in research and clinical settings for studying lipid metabolism and disease associations.