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The Journal of Immunology, 1998, 160: 2523-2530.
Copyright © 1998 by The American Association of Immunologists

Malaria Elicits Type 1 Cytokines in the Human Placenta: IFN-{gamma} and TNF-{alpha} Associated with Pregnancy Outcomes1

Michal Fried2,*, Richard O. Muga{dagger}, Ambrose O. Misore{ddagger} and Patrick E. Duffy2,*

* U.S. Army Medical Research Unit, Kenya Medical Research Institute, Kisumu, Kenya; and the {dagger} Nyanza Provincial Medical Office and the {ddagger} New Nyanza Provincial General Hospital, Ministry of Health, Kisumu, Kenya

Pregnant women, especially primigravidas, are highly susceptible to malaria infection, resulting in maternal anemia and low birth weight infants. Because circulating parasitemia is rare in the newborn, the cause of poor fetal outcomes has been unclear. We measured cytokine concentrations in placentas collected from women delivering in urban hospitals in malaria-holoendemic or nonendemic areas of Kenya. Normal placentas displayed a bias toward type 2 cytokines; type 1 cytokines IFN-{gamma} and IL-2 were absent in placentas not exposed to malaria but present in a large proportion of placentas from a holoendemic area. TNF-{alpha} and TGF-ß concentrations were significantly higher, and IL-10 concentrations significantly lower, in placentas from the holoendemic area. Among primigravidas, placental TNF-{alpha} concentrations were significantly higher in the presence of severe maternal anemia, and both IFN-{gamma} and TNF-{alpha} were significantly elevated when a low birth weight, rather than normal weight, infant was delivered. We conclude that maternal malaria decreases IL-10 concentrations and elicits IFN-{gamma}, IL-2, and TNF-{alpha} in the placenta, shifting the balance toward type 1 cytokines. This is the first demonstration that these placental cytokine changes are associated with poor pregnancy outcomes in humans.




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