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Retinoic acid (RA) has a variety of biological effects in mammalian cells and tissues. It is well known that RA is a potent anticancer agent that induces differentiation of leukemia cells as well as inhibiting cell growth. The current study examined HL60 proteins using anti-RA monoclonal antibodies (ARMAs) and found that some RA-binding proteins may be histones. These proteins eluted in the void volume fractions following Mono Q anion exchange chromatography and immunostained with ARMAs. These ARMAs showed specific binding to the proteins in a saturable manner that depended on antibody concentration. Certain of these proteins co-migrated with histones on one-dimensional polyacrylamide gel electrophoresis. It was also found that histones isolated from HL60 cells treated with RA also immunostained with ARMAs. These results indicate that basic proteins, including histones, may be bound to RA covalently in HL60 cells and that RA-binding histones may play significant roles in the transcriptional regulation of genes by RA.

Demonstration of Basic Proteins That Bind Retinoic Acid in the Human Myeloid Leukemia Cell Line HL60