Does the presence of the 3500 mutant apolipoprotein B-100 in low density lipoprotein particles affect their atherogenicity?


:Apolipoprotein B-100 (apo B-100) is the protein component of low density lipoprotein (LDL) responsible for its binding and clearance by LDL receptors (LDL-R). In familial defective apo B-100 (FDB), a mutation in apo B-100 at residue 3500 markedly reduces its affinity for LDL-R, often causing accumulation of defective LDL particles, and an increased proneness to coronary artery disease (CAD). In FDB heterozygotes, about 70% of the LDL particles are mutant, which may alter their atherogenicity relative to LDL containing normal apo B. Therefore, we compared CAD in heterozygous FDB with CAD in heterozygous familial hypercholesterolemia (FH), since raised LDL is usually present from birth in both conditions, and in FH the LDL particles that accumulate have normal apo B, as the inherited defect involves the LDL-R. The clinical presentation of coronary atherosclerosis and its angiographic appearance were examined in FDB and FH patients matched for conventional cardiac risk factors (hypertension, smoking, sex) and serum lipid levels. There was no significant difference between the FDB and FH patients (n=11 pairs) in the type of cardiac symptoms or their ages of onset (50 +/- 9 vs. 45 +/- 11 years). Coronary angiographic appearance was also similar in both groups (n=9 pairs). These observations suggest that LDL particles with the 3500 mutation in apo B have the same atherogenicity as LDL particles with normal apo B.






Maher VM,Gallagher JJ,Thompson GR,Myant NB




Has Abstract


1995-11-01 00:00:00














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