Strategies to prevent cleavage of the linker region between ligand-binding repeats 4 and 5 of the LDL receptor.

Abstract:

:A main strategy for lowering plasma low-density lipoprotein (LDL) cholesterol levels is to increase the number of cell-surface LDL receptors (LDLRs). This can be achieved by increasing the synthesis or preventing the degradation of the LDLR. One mechanism by which an LDLR becomes non-functional is enzymatic cleavage within the 10 residue linker region between ligand-binding repeats 4 and 5. The cleaved LDLR has only three ligand-binding repeats and is unable to bind LDL. In this study, we have performed cell culture experiments to identify strategies to prevent this cleavage. As a part of these studies, we found that Asp193 within the linker region is critical for cleavage to occur. Moreover, both 14-mer synthetic peptides and antibodies directed against the linker region prevented cleavage. As a consequence, more functional LDLRs were observed on the cell surface. The observation that the cleaved LDLR was present in extracts from the human adrenal gland indicates that cleavage of the linker region takes place in vivo. Thus, preventing cleavage of the LDLR by pharmacological measures could represent a novel lipid-lowering strategy.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Strøm TB,Bjune K,Costa LTD,Leren TP

doi

10.1093/hmg/ddz164

subject

Has Abstract

pub_date

2019-11-15 00:00:00

pages

3734-3741

issue

22

eissn

0964-6906

issn

1460-2083

pii

5537031

journal_volume

28

pub_type

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