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Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Holzer, M; Kern, S; Trieb, M; Trakaki, A; Marsche, G.
HDL structure and function is profoundly affected when stored frozen in the absence of cryoprotectants.
J Lipid Res. 2017; 58(11):2220-2228
Doi: 10.1194/jlr.D075366
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- Führende Autor*innen der Med Uni Graz
- Holzer Michael
- Co-Autor*innen der Med Uni Graz
- Marsche Gunther
- Trakaki Athina
- Trieb Markus
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- Abstract:
- Analysis of structural and functional parameters of HDL has gained significant momentum in recent years because they are stronger predictors of cardiovascular risk than HDL-cholesterol levels. Surprisingly, in most HDL studies, very low attention is paid to HDL storage, which might critically affect functional properties. In the present study, we systematically examined the impact of storage and freezing on the structural/functional properties of freshly isolated HDL. Initial damage to HDL starts between week 1 and week 4 of storage. We observed that prolonged freezing at -20°C or -70°C led to a shedding of apoA-I from HDL and to the formation of large protein-poor particles, indicating that HDL is irreversibly disrupted. These structural alterations profoundly affected key metrics of HDL function, including HDL-cholesterol efflux capacity and HDL paraoxonase activity. Flash-freezing of isolated HDL prior to storage at -70°C did not preserve HDL structure. However, addition of the cryoprotectants, sucrose or glycerol, completely preserved structure and function of HDL when stored for at least 2 years. Our data clearly indicate that HDL is a complex particle requiring special attention when stored. Addition of cryoprotectants to isolated HDL samples before storage will make biochemical and clinical HDL research studies more reproducible and comparable. Copyright © 2017 by the American Society for Biochemistry and Molecular Biology, Inc.
- Find related publications in this database (using NLM MeSH Indexing)
- Blood Specimen Collection - methods
- Cryopreservation - methods
- Humans -
- Lipoproteins, HDL - chemistry
- Lipoproteins, HDL - metabolism