"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.
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
Source:Johns Hopkins Medical Institutions