Immune culprit in malaria-associated anemia

April 24, 2006

Scientists have found that a protein produced by immune cells during malaria infection triggers severe anemia, a lethal complication of the disease. Richard Bucala and colleagues at Yale University (New Haven, CT) show that immune cells in mice with malaria secrete a protein called MIF, which decreases the production of red blood cells (RBCs) from the bone marrow. The study appears online on April 24 in The Journal of Experimental Medicine.

According to the World Health Organization, there are approximately 300 million to 500 million cases of malaria each year, with pregnant women and young children at highest risk. Severe anemia--a common complication of malaria--is one of the major causes of death among children.

Malaria parasites use RBCs as multiplication factories, rupturing the cells as progeny parasites exit. Infection also hampers the production of new RBCs from the bone marrow, an effect this group recently attributed to MIF, which is produced by immune cells that gobble up infected RBCs. Bucala's new study shows that mice genetically engineered to lack MIF were less anemic and survived longer than normal mice when infected with malaria-causing parasites.

The Yale team is now trying to determine whether MIF levels influence susceptibility to or severity of malarial anemia in humans. If so, synthetic inhibitors of MIF--currently in clinical development--might provide an effective alternative to the costly (and risky) blood transfusions currently used to treat malarial anemia.

Journal of Experimental Medicine

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