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Int. J. Mol. Sci. 2018, 19(2), 640; https://doi.org/10.3390/ijms19020640

Non-Native Conformational Isomers of the Catalytic Domain of PCSK9 Induce an Immune Response, Reduce Lipids and Increase LDL Receptor Levels

1,†
,
1,†
,
1,†
,
2
,
3
,
3
,
1,‡
and
1,4,5,*
1
Research Center for Human Genetics at Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, 1825 Pressler St., Houston, TX 77030, USA
2
Research Center for Precision Biomedicine at Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, 1825 Pressler St., Houston, TX 77030, USA
3
Department of Biostatistics, The University of Texas MD Anderson Cancer Center, 1400 Pressler St., Houston, TX 77030, USA
4
Consortium on Aging, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
5
The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX 77225, USA
These authors contributed equally to this work.
This author retired.
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 16 February 2018 / Accepted: 19 February 2018 / Published: 24 February 2018
(This article belongs to the Special Issue Cholesterol and Lipoprotein Metabolism)
Full-Text   |   PDF [3383 KB, uploaded 24 February 2018]   |  

Abstract

PCSK9 (Proprotein convertase subtilisin/kexin type 9) increases plasma cholesterol levels by promoting LDL receptor degradation. Current antibody inhibitors block the interaction between PCSK9 and LDL receptors, significantly decrease plasma cholesterol levels, and provide beneficial clinical outcomes. To reduce the action of PCSK9 in plasma, a novel strategy that will produce a panel of non-native, conformationally-altered isomers of PCSK9 (X-PCSK9) to develop active immunotherapy targeting of native PCSK9 and inhibiting/blocking the interaction of PCSK9 with LDL receptor, thus decreasing plasma cholesterol levels is proposed. The authors used the scrambled disulfide bond technique to generate conformationally-altered isomers of the catalytic domain of mouse PCSK9. The focus was on the immune response of four X-isomers and their effects on plasma cholesterol and triglyceride levels in both C57BL/6J and Apoe−/− mice. The authors showed that the four immunogens produced significant immunogenicity against native PCSK9 to day 120 after immunization of C57BL/6J and Apoe−/− mice. This resulted in significantly decreased plasma cholesterol levels in C57BL/6J mice, and to a lesser degree in Apoe−/− mice. The X-PCSK9-B1 treated mice had increased LDL receptor mRNA and protein levels at day 120 after treatment. Thus, this study provides a new, potentially promising approach that uses long-term immunotherapy for a treatment of hypercholesterolemia. View Full-Text
Keywords: PCSK9; scrambled disulfide bonds; cholesterol; triglyceride; LDL receptor PCSK9; scrambled disulfide bonds; cholesterol; triglyceride; LDL receptor
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Jiang, C.; Nischal, H.; Sun, H.; Li, L.; Cao, Y.; Wei, P.; Chang, J.-Y.; Teng, B.-B. Non-Native Conformational Isomers of the Catalytic Domain of PCSK9 Induce an Immune Response, Reduce Lipids and Increase LDL Receptor Levels. Int. J. Mol. Sci. 2018, 19, 640.

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