The Influence of Ca2+ and Zn2+ on the Amyloid Fibril Formation by β-Casein

Jia	      Wang; Jihua	      Liu; Guangguang	      Du; Yang	      An; Chunfang	      Zhao; Baohua	      Zeng

doi:10.2174/0929866527666200318143533

Abstract

Background: The amyloid fibril formation in different tissues or organs is related to amyloidosis. The Ca2+, Zn2+ and heparan sulfate (HS) are important elements and compositions in human body, which play a key role in regulating various physiological activities. Recently, there are increasing evidence suggest that they are closely linked to the amyloid fibril formation.

Objective: The effect of Ca2+ and Zn2+ on the amyloid fibril formation by β-casein was investigated in the absence and presence of HS, which was significantly to explore the relationship between the concentration changes of Ca2+ and Zn2+ and amyloid fibril formation.

Methods: In this work, the influence of Ca2+ and Zn2+ on the β-casein fibril formation in the absence and presence of HS was investigated by various methods of Thioflavin T fluorescence assay, transmission electron microscopy and intrinsic fluorescence measure.

Results: The results demonstrated that Ca2+ and Zn2+ promoted the β-casein fibril formation. The effect of Ca2+ was greater than that of Zn2+. Meanwhile, the both metal ions had stronger effects when β-casein was incubated with HS together. In addition, it was also observed that the microenvironment of β-casein was changed because the intrinsic fluorescence peaks were red-shifted on the influence of Ca2+ and Zn2+.

Conclusion: Ca2+ and Zn2+ were capable of promoting the β-casein fibril formation in the both absence and presence of HS. This work set up the foundation for further researching of the amyloidosis pathogenesis and provided new insight for us to understand relationship between the inflammation and amyloidosis.

Keywords: β-casein, Ca2+, Zn2+, HS, amyloid fibril formation, mammary gland.

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DOI https://dx.doi.org/10.2174/0929866527666200318143533	Print ISSN 0929-8665
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The Influence of Ca²⁺ and Zn²⁺ on the Amyloid Fibril Formation by β-Casein

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The Influence of Ca2+ and Zn2+ on the Amyloid Fibril Formation by β-Casein

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The Influence of Ca²⁺ and Zn²⁺ on the Amyloid Fibril Formation by β-Casein

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