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Malarial Parasite Hides In Placenta

A study by Karolinska Institutet in Sweden and Makerere University in Uganda finds that the malarial parasite hides in the placenta of pregnant women// and this is the reason for pregnant women and children to suffer severe malaria.

Plasmodium falciparium is the worst of the four malaria parasites that infect man. It is particularly dangerous in that it also infects the placenta of pregnant women, with fatal consequences for both her and the foetus. This, combined with the often feeble medical resources of malaria-stricken countries, can lead to such serous complications that the mother dies during delivery.

For some reason, women in their first pregnancy lose the semi-immunity that is normally found in adults, explains Niloofar Rasti, a KI graduate student who has been working with the study. The placenta seems to be an anatomically favourable environment for a subpopulation of the parasites.

The research group from Karolinska Institutet, under the leadership of Professor Mats Wahlgren, has been working with colleagues from KI's partner university in Uganda to study in detail how the parasite infects the placenta. Their results, which are published in the American scientific journal PNAS, can enable the development of vaccines and therapies to combat severe malarial infections.

During one particular phase of its lifecycle, the parasite enters human red blood cells, where it produces proteins that attach themselves to receptors in the wall of the blood vessels. This causes the red blood cells to accumulate in organ capillaries, and gives rise to life-threatening symptoms. Adults who have been infected several times can become partly immune as their defence system gradually starts to recognise the parasite's proteins. When the placenta is formed, however, a new environment is introduced with a different set of receptors. This means that a new growth niche is made available to a subpopulation of the parasites.


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