Abstract
This study was designed to explore the effects of acute nutritional deprivation (starvation) on macrophage function in mice. In vivo macrophage activity was increased by starvation, as determined by multiplication of Listeria monocytogenes in both spleens and livers after intravenous injection. Similarly, in vitro studies revealed that the capacity of peritoneal macrophages to kill listeria was enhanced by starvation. This function was increased further by the addition of small concentrations of lipopolysaccharide (LPS; 10-100 ng/ml). The bactericidal activity of macrophages from starved mice, however, did not reach the levels observed with macrophages from BCG-infected mice. Furthermore, LPS did not appear to be an important second signal for macrophage activation in vivo, as LPS-unresponsive mice (C3H/HeJ and A/J) were protected by starvation. In contrast to these results we found that starved mice were not protected against Toxoplasma gondii infection and that macrophages from starved mice were unable to prevent multiplication of toxoplasma trophozoites in vitro. In toto, these experiments suggest that macrophage function is enhanced by starvation, but that this enhancement is not sufficient to fulfill all criteria for macrophage activation.
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Selected References
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