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Degradation of [125I]-labeled low density lipoprotein (LDL) by cultured normal human skin fibroblasts was enhanced by exposure to concentrations of L-triiodothyronine (T3) spanning the physiological range. Analysis of LDL concentration curves suggests that T3 may increase LDL receptor number rather than alter the affinity of LDL for its receptor. No effect of T3 on LDL degradation was observed in receptor negative cells. Thus thyroid hormone appears to regulate receptor-mediated LDL degradation by increasing the binding of the lipoprotein to its cell-surface receptor.
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