Egg yolk low density lipoprotein (YLDL) had a growth stimulating activity t
o a human monocytic cell line UM. Analysis on binding of YLDL labeled with
europium (Eu) to the UM cells by time-resolved fluorometory showed that UM
cells had a large number of binding sites with low binding affinity on the
cell surface. Inhibition analysis of the binding by using human serum lipop
roteins suggested the binding site would have an affinity to human very low
density lipoprotein.