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• W2012080462 abstract "The objective of this study was to develop a new and simple method for measuring low-density lipoprotein receptor (LDLR) activity using peripheral lymphocytes enabling us to clinically diagnose familial hypercholesterolemia (FH) and ascertain the involved mutations (such as K790X mutation), that might not be clearly detected in the conventional method. Our method comprised the following 2 features: first, we used anti-CD3/CD28 beads to stimulate T-lymphocytes to obtain a uniform fraction of lymphocytes and maximum up-regulation of LDLR. Second, we excluded the possibility of overestimation of lymphocyte signals bound only to its surface, by adding heparin to the cultured lymphocytes used for the LDLR assay. Based on the genetic mutation, the FH subjects were divided into 2 groups, K790X, (n = 20) and P664L, (n = 5), and their LDLR activities was measured by this method, which was found to be 55.3 ± 8.9% and 63.9 ± 13.8%, respectively, of that of the control group (n = 15). In comparison, the LDLR activity was 86.1 ± 11.6% (K790X) and 73.3 ± 6.3% (P664L) of that of the control group when measured by the conventional method, indicating that impairment of LDLR function in FH K790X subjects was much more clearly differentiated with our method than with the conventional method (paired t-test, p < 0.0001). The levels of LDLR expression also showed similar tendencies, that is, 89.4 ± 13.2% (K790X) and 76.9 ± 17.4% (P664L) of that of the control group when measured by the conventional method, and 78.1 ± 9.7% (K790X) and 70.3 ± 26.5% (P664L) when measured by our new method. In addition, we confirmed that there was little influence of statin treatment on LDLR activity among the study subjects when our method was used. These results demonstrate that our new method is applicable for measuring LDLR activity, even in subjects with an internally defective allele, and that T-lymphocytes of the FH K790X mutation possess characteristics of that allele." @default.
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• W2012080462 date "2009-02-01" @default.
• W2012080462 modified "2023-10-12" @default.
• W2012080462 title "A novel method for determining functional LDL receptor activity in familial hypercholesterolemia: Application of the CD3/CD28 assay in lymphocytes" @default.
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• W2012080462 doi "https://doi.org/10.1016/j.cca.2008.10.010" @default.
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