alexa Non-denaturing polyacrylamide gradient gel electrophoresis for the diagnosis of dysbetalipoproteinemia.
Biochemistry

Biochemistry

Biochemistry & Physiology: Open Access

Author(s): Blom DJ, Byrnes P, Jones S, Marais AD

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Abstract Dysbetalipoproteinemia, an uncommon but highly atherogenic mixed hyperlipidemia due to the accumulation of remnants of triglyceride-rich lipoproteins, is characterized by cholesterol-enriched VLDL that migrates in the beta-position on agarose gels. The demonstration of a broad beta-band on agarose gel electrophoresis of plasma is an insensitive method and ultracentrifugation is an impractical method of diagnosing this condition. Non-denaturing polyacrylamide gradient gel electrophoresis (PGGE) was investigated as a screening method for the diagnosis of dysbetalipoproteinemia. A minigel procedure separating the Sudan Black prestained apolipoprotein B (apoB)-containing lipoproteins on a 2-8\% polyacrylamide gel at 4 degrees C overnight was analyzed for ultracentrifugally and genetically proven dysbetalipoproteinemic subjects as well as matched controls for mixed hyperlipidemia. Visual inspection revealed that the presence of only small VLDL- and IDL-like particles in untreated patients was highly sensitive (72\%) and specific (95\%) for dysbetalipoproteinemia. Videodensitometric analysis of area under the curve for large and small VLDL, as well as IDL and LDL, permitted even better discrimination in subjects whose profiles included some staining in the LDL-like region. A ratio of area under the curve of more than 0.5 for IDL-LDL allowed for a specificity of 100\% and a sensitivity of 89\% for the diagnosis of dysbetalipoproteinemia. This modified PGGE system may be useful in screening for dysbetalipoproteinemia.
This article was published in J Lipid Res and referenced in Biochemistry & Physiology: Open Access

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