The in vivo inflow rate of low density lipoprotein (LDL) cholesterol to the thoracic aorta, renal and coronary arteries was studied in minipigs with endogenously labelled 3H-cholesterol LDL. The LDL cholesterol inflow rate to these arteries was three to five times higher in animals with hypercholesterolemia and experimental atherosclerosis compared to the controls. Moreover, the inflow rate of LDL cholesterol to the control intact arteries was so high that the cumulation of arterial cholesterol cannot be regarded simply as one-way transport and the amount of cholesterol present in the arterial wall is the result of the equilibrium between LDL cholesterol inflow and transport out from the wall.
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