Abstract
The anemia associated with malaria is complex, and multiple factors contribute to its severity. An increased destruction and a decreased production of erythrocytes are involved; however, the mechanisms responsible remain unclear. Tumor necrosis factor alpha (TNF-alpha), released by macrophages in response to infection, is thought to play a role through its ability to inhibit erythropoiesis. In these studies we have examined erythropoiesis in mice infected with Plasmodium berghei and in mice infused with recombinant TNF-alpha via implanted osmotic pumps. In both groups of mice there was (i) a reduction of pluripotent stem cells in the bone marrow and a concomitant increase in the spleen, (ii) a reduction of erythroid progenitor cells, and (iii) a reduced incorporation of 59Fe into erythrocytes. When P. berghei-infected mice were given antiserum against recombinant murine TNF, erythropoiesis was partially restored. There was a significant increase in bone marrow stem cells, erythroid progenitor cells, and 59Fe incorporation into erythrocytes in P. berghei-infected mice that had been treated with anti-TNF. How TNF may act, directly or indirectly, to inhibit erythropoiesis is not yet clear. These results demonstrate that TNF mediates, in part, the anemia associated with malaria.
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Selected References
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