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. 1994 Jul;82(3):397–403.

Anaemia and resistance to malaria in transgenic mice expressing human tumour necrosis factor.

J Taverne 1, N Sheikh 1, J B de Souza 1, J H Playfair 1, L Probert 1, G Kollias 1
PMCID: PMC1414872  PMID: 7959874

Abstract

Transgenic mice carrying a modified human tumour necrosis factor (huTNF)/beta-globin gene construct linked to the T-cell-specific locus control region of the human CD2 gene express huTNF in their T cells which is released into the circulation and causes the development of a wasting syndrome. We now report that the mice develop anaemia, probably through enhanced erythrophagocytosis rather than inhibition of reticulocyte production. Thus autologous erythrocytes, as well as sheep erythrocytes, were cleared more rapidly from the circulation of transgenic mice than from littermate controls. By contrast, peritoneal macrophages from transgenic mice were less phagocytic in vitro than cells from controls. They also secreted less murine (mu)TNF when stimulated by either bacterial lipopolysaccharide or toxic malarial antigens. The yields of muTNF approached normal levels, however, when these refractory cells from the transgenic mice were stimulated in the presence of a high concentration of indomethacin, suggesting that the production of muTNF was inhibited by enhanced synthesis of prostaglandins. The parasitaemia of transgenic mice infected with Plasmodium yoelii was about 10-fold less at its peak than in controls, although it followed the same time-course, and the multiplication of P. chabaudi was inhibited to an even greater degree. This control of parasitaemia may also be explained by enhancement of macrophage activity, mediated by huTNF acting on the murine p55 receptor, presumably by increasing the removal of parasites by phagocytosis or their killing by toxic products released by the activated macrophages. These observations suggest that a factor in the anaemia of human malaria may be macrophage activation caused by the secretion of TNF that occurs in this disease.

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Selected References

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