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March 3, 2006

Newly Discovered Killer Cell Fights Cancer

Topics: Medicine

It's late in the day and I haven't time right now to offer much commentary on this, but the news story is worthy of mention. The news report follows a journal article: "Interferon-producing killer dendritic cells provide a link between innate and adaptive immunity." Nature Medicine 12, 167 - 168 (2006). I hope to have time to come back to this a little later.

As is pointed out in the article, most of the immune system typically works through a web of cross-talk and signaling among a variety of cells. One of the first immune cells that invading bacteria or cancer cells - both of which carry antigens that alert the immune system - may encounter is a natural killer (NK) cell. As its name implies, NK cells deliver a deadly blow by poking holes in the invader's outer membrane. Then, NK cells secrete molecules that reach other immune cells, including dendritic cells, known as the main messenger for the immune system. Dendritic cells spread "look here" information about foreign invaders to other immune cells, but do not actually kill the invaders. In this news report we are reading about a cell that appears to have features of both dendritic cells and also natural killer cells - having both "seeker and killer" attributes.

BALTIMORE, March 3 (AScribe Newswire) -- A mouse immune cell that plays dual roles as both assassin and messenger, normally the job of two separate cells, has been discovered by an international team of researchers from the United States and France. The discovery has triggered a race among scientists to find a human equivalent of the multitasking cell, which could one day be a target for therapies that seek out and destroy cancer.

"In the same way that intelligence and law enforcement agencies can face deadly threats together instead of separately, this one cell combines the ability to kill foreign pathogens and distribute information about that experience," says Drew Pardoll, M.D., Ph.D., the Seraph Professor of Oncology at the Johns Hopkins Kimmel Cancer Center.

"We think this hybrid cell speeds up immune reactions and makes the system more efficient," adds Pardoll, whose findings are reported in the February issue of Nature Medicine.

The Hopkins investigators speculate that the hybrid, dubbed "IKDC" for interferon-producing killer dendritic cell, has been missed by cancer biologists because it is rare, making up one-tenth of cells in the spleen with similar features, such as other dendritic cells, according to Frank Housseau, Ph.D., research associate at Hopkins' Kimmel Cancer Center and member of Pardoll's immunology laboratory. (Read more... )

Related: Dendritic cells (II): role and therapeutic implications in cancer

also: Natural Killer (NK) Cells and NKT cells (may be a little technical for the average non-science reader, but nonetheless interesting).

Posted by Richard at March 3, 2006 4:56 PM



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