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Published on: April 28, 2016
Circulating ghrelin exists in both lipoprotein bound and free forms
1Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospital, UK. lizholmes@hotmail.co.uk
Annals of Clinical Biochemistry
|October 21, 2009
Summary
Acylated ghrelin (AG) and unacylated ghrelin (UAG) bind differently to lipoproteins. These distinct binding patterns may influence their roles in obesity and cardiovascular disease development.
Area of Science:
- Endocrinology
- Lipid Metabolism
- Cardiovascular Science
Background:
- Ghrelin, a gastric peptide, is linked to obesity and cardiovascular disease.
- Ghrelin's interaction with lipoproteins is known, but differences between acylated (AG) and unacylated (UAG) forms require clarification.
Purpose of the Study:
- To investigate and differentiate the lipoprotein binding patterns of acylated ghrelin (AG) and unacylated ghrelin (UAG).
Main Methods:
- Lipoprotein fractions were isolated using a self-generating iodixanol gradient.
- Specific enzyme immunoassays were employed to quantify AG and UAG levels.
Main Results:
- AG demonstrated relatively equal binding across VLDL (26%), LDL (22%), and HDL (23%), with 27% found as a plasma protein.
- UAG exhibited more specific binding to HDL (49%), with 48% detected as a plasma protein.
Conclusions:
- The distinct lipoprotein binding profiles of AG and UAG suggest varied biological functions.
- These differences may impact energy metabolism, obesity pathogenesis, and cardiovascular disease modulation.
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