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- W1968216994 abstract "Lipoprotein(a) [Lp(a)] is a low-density lipoprotein (LDL) particle in which apolipoprotein B-100 (apo B) is attached to a large plasminogen-like protein called apolipoprotein(a) [apo(a)]. Apo(a) has several genetically determined phenotypes differing in molecular weight, to which Lp(a) concentrations in plasma are inversely correlated. LDL and apo B levels are often elevated in untreated hypothyroidism and lowered by thyroxine (T4) treatment, probably due to an increase in LDL receptors. We measured plasma concentrations of LDL, apo B, and Lp(a) in 13 patients with symptomatic primary hypothyroidism before and during T4 therapy. The mean concentration of LDL decreased significantly (P = .006) from 6.05 mmol/L to 4.07 mmol/L, and the mean concentration of apo B decreased significantly (P = .005) from 1.42 g/L to 1.12 g/L. Median Lp(a) concentrations remained unchanged (P = .77); they were 17.05 mg/dL before and 16.59 mg/dL during T4 treatment. In both the untreated condition and during substitution therapy, Lp(a) levels were higher in patients than in healthy controls, probably due to a relatively high frequency of the small Lp(a) phenotypes in our patients. Since Lp(a) contains apo B, which is a ligand for the LDL receptor, it is surprising that Lp(a) is not reduced along with LDL and apo B. These findings suggest that the catabolism of LDL and Lp(a) differ in some respect, and that thyroid hormones have little, if any, effect on Lp(a)." @default.
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- W1968216994 date "1992-08-01" @default.
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- W1968216994 title "Treatment of hypothyroidism reduces low-density lipoproteins but not lipoprotein(a)" @default.
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- W1968216994 doi "https://doi.org/10.1016/0026-0495(92)90176-b" @default.
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