Flipping the 'off' switch on cell growth

Feb 22, 2013

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 who led the research team and has long studied the role of low-oxygen conditions in cancer, lung disease and . "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 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 "" 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 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.

In the new research, Semenza and his colleagues further probed HIF-1α's relationship to DNA replication by comparing cells in low-oxygen conditions to cells kept under normal conditions. They measured the amount of DNA replication complexes in the cells, as well as how active the complexes were. The cells kept in low-oxygen conditions, which had stopped dividing, had just as much of the DNA replication machinery as the normal dividing cells, the researchers found; the difference was that the machinery wasn't working. It turned out that in the nondividing cells, HIF-1α was binding to a protein that loads the DNA replication complex onto , and preventing the complex from being activated.

"Our experiments answered the long-standing question of how, exactly, cells stop dividing in response to low oxygen," says Maimon Hubbi, Ph.D., a member of 's team who is now working toward an M.D. degree. "It also shows us that the relationship between HIF-1α and the complex is reciprocal—that is, each can shut the other down."

Explore further: Researchers study vital 'on/off switches' that control when bacteria turn deadly

More information: stke.sciencemag.org/cgi/conten… /sigtrans;6/262/ra10

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Tausch
1 / 5 (1) Feb 22, 2013
The HIF-1{alpha} subunit is regulated by O2-dependent hydroxylation of proline residue 402, 564, or both, by prolyl hydroxylase domain protein 2 (PHD2), which promotes binding of the von Hippel-Lindau protein (VHL), leading to ubiquitination and proteasomal degradation; and O2-dependent hydroxylation of asparagine residue 803 by factor inhibiting HIF-1 (FIH-1), which blocks the binding of the 300-kilodalton coactivator protein (p300) and CREB binding protein (CBP). The hydroxylation reactions, which utilize O2 and {alpha}-ketoglutarate as substrates and generate CO2 and succinate as by-products, provide a mechanism by which changes in cellular oxygenation are transduced to the nucleus as changes in HIF-1 activity. Hydroxylase activity is inhibited in the presence of low concentrations of O2, high concentrations of tricarboxylic acid cycle intermediates (isocitrate, oxaloacetate, succinate, or fumarate), or chelators of Fe(II). Receptor for activated C kinase 1 (RACK1) competes with
Tausch
1 / 5 (1) Feb 22, 2013
http://stke.scien.../407/cm8

Resort to the abstract above or more if you have access.
Incomplete, insufficient, and unnecessary is the article's:

"HIF-1α was binding to a protein that loads the DNA replication complex onto DNA strands, and preventing the complex from being activated."

The best way to understand is to view the graphical pathway.

Tausch
1 / 5 (1) Feb 22, 2013
HIF-1α was binding to a protein.
Still searching for that elusive protein. Will post if found.
C_elegans
not rated yet Feb 22, 2013
"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."

Could those be the mystery protein?
Tausch
1 / 5 (1) Feb 23, 2013
Not quite. Unless HIF-1α binds to one of the two.
Looking for the cascade pathway to see what binds with what.