A protein known for turning on genes to help cells survive low-oxygen conditions also slows down the copying of new DNA strands, thus shutting down the growth of new cells, Johns Hopkins researchers report. Their discovery has wide-ranging implications, they say, given the importance of this copying - known as DNA replication - and new cell growth to many of the body's functions and in such diseases as cancer.
"We've long known that this protein, HIF-1α, can switch hundreds of genes on or off in response to low oxygen conditions," says Gregg Semenza, M.D., Ph.D., a molecular biologist who led the research team and has long studied the role of low-oxygen conditions in cancer, lung disease and heart disorders. "We've now learned that HIF-1α is even more versatile than we thought, as it can work directly to stop new cells from forming." A report on the discovery appears in the Feb. 12 issue of Science Signaling.
With his team, Semenza, who is the C. Michael Armstrong Professor of Medicine at the Johns Hopkins University School of Medicine's Institute for Cell Engineering and Institute for Genomic Medicine, discovered HIF-1α in the 1990s and has studied it ever since, pinpointing a multitude of genes in different types of cells that have their activity ramped up or down by the activated protein. These changes in so-called "gene expression" help cells survive when oxygen-rich blood flow to an area slows or stops temporarily; they also allow tumors to build new blood vessels to feed themselves.
To learn how HIF-1α's own activity is controlled, the team looked for proteins from human cells that would attach to HIF-1α. They found two, MCM3 and MCM7, that limited HIF-1α's activity, and were also part of the DNA replication machinery. Those results were reported in 2011.