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Effects of enzymes on elastic modulus of low-density lipoproteins were investigated using atomic force microscopy.

Abstract：

:Oxidation of low-density lipoproteins (LDLs) induces development of cardiovascular disease. Recently, reports of studies using atomic force microscopy (AFM) have described that the elastic modulus of metal-induced oxidized LDLs is lower than the modulus before oxidation. However, the mechanisms of change of the elastic modulus have not been well investigated. We postulated that disorder of the LDL structure might decrease the elastic modulus. This study measured the elastic modulus of LDLs before and after enzyme treatment with V8 protease, α-chymotrypsin, and phospholipase A2. After LDLs were obtained from serum by ultracentrifugation, LDLs or enzyme-treated LDLs were physically absorbed. They were crowded on a mica surface. Although V8 protease and α-chymotrypsin did not induce the elastic modulus change, treatment with PLA2 decreased the elastic modulus. The LDL particle size did not change during the enzyme treatment. Results suggest that disordering of the lipid structure of the LDL might contribute to the elastic modulus change. Results show that AFM might be a useful tool to evaluate disorders of complex nanoscale particle structures from lipids and proteins such as lipoproteins.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Takeda S,Sakurai T,Hui SP,Fuda H,Chiba H

doi

10.1016/j.bbrc.2018.04.211

subject

Has Abstract

pub_date

2018-06-27 00:00:00

pages

607-611

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)31008-8

journal_volume

501

pub_type

杂志文章

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