Cryopreservation with sucrose maintains normal physical and biological properties of human plasma low density lipoproteins.
J Lipid Res
; 33(10): 1551-61, 1992 Oct.
Article
en En
| MEDLINE
| ID: mdl-1431579
The ability to preserve low density lipoprotein (LDL) preparations frozen for weeks and months without changes in structure or biological properties is of potential use in long-term comparative studies of LDL. We demonstrate that freeze-thawing of LDL causes marked alterations in its structure and biological behavior, and that such changes can be prevented by the addition of sucrose to the LDL solution prior to freezing. Freezing LDL at -70 degrees C in the absence of sucrose resulted in aggregation and fusion of particles as measured by electron microscopy, spectrophotometric absorption, and column gel filtration. This was associated with increased binding affinity of monoclonal antibodies at epitopes distant from the receptor binding region. Functional changes induced by freezing included 3- to 10-fold increases in binding at 4 degrees C and 37 degrees C, and uptake of LDL in fibroblasts, attributable mainly to increases in nonspecific binding processes. Cryopreservation of LDL in 10% sucrose (w/v) completely prevented the structural and functional changes incurred after short-term freezing, and LDL cryopreserved in sucrose for as long as 18 months displayed cell binding, uptake, and degradation very similar to that of freshly obtained LDL.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sacarosa
/
Criopreservación
/
Lipoproteínas LDL
Límite:
Humans
Idioma:
En
Revista:
J Lipid Res
Año:
1992
Tipo del documento:
Article
Pais de publicación:
Estados Unidos