Functional expression of human and mouse low density lipoprotein receptors in hybridomas.
Abstract
Though a mouse.human-human heterohybridoma, N12-16.63, secreting an antitetanus toxoid human monoclonal antibody grew well in a serum-free medium, its high producing subclone N12-69 required SSGF-I, a low density lipoprotein (LDL) from swine serum, or human-LDL (h-LDL) for growth. The growth-promoting action of SSGF-I was caused by its lipid fraction, and SSGF-I could be replaced completely with cholesterol in the presence of bovine serum albumin (BSA). Thus, cell line N12-69 is a cholesterol auxotroph of the heterohybridoma. N12-69 cells express both mouse and human LDL receptors on the cell surface in a ratio of 1:4. SSGF-I bound to both receptors with the same binding affinity, and h-LDL was also take up by the same receptors, though the affinity constant of the receptors for SSGF-I was 1.5 times stronger than that for h-LDL. The growth of N12-69 cells was completely inhibited by the addition of dextran sulfate, which is known to inhibit the binding of LDL to LDL receptors, to an SSGF-I or h-LDL containing medium but was not inhibited at all when dextran sulfate was added to a serum-free medium supplemented with cholesterol and BSA. Furthermore, an anti-human LDL receptor monoclonal antibody partially inhibited the growth of...Continue Reading
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