Increase in colony stimulating factor (CSF) in serum and augmentation of CSF responsiveness of lymphoid mononuclear cells by acute Trypanosoma cruzi infection in mice

The Tohoku Journal of Experimental Medicine
N TakasuY Hashimoto

Abstract

Acute infection of Trypanosoma (T.) cruzi to C3H/HeN mice caused the induction of a higher level of serum colony stimulating factor (CSF) activity to support the proliferation of mouse bone marrow cells. The CSF activity reached a maximum 2 days after the infection and declined thereafter. Spleen cells of the T. cruzi-infected mice showed higher levels of responsiveness to CSF in L929-conditioned medium, mouse recombinant GM-CSF and infected mouse sera as compared with normal mouse spleen cells. The induction of CSF-responding cells became plateau 4 days after the infection and it decreased thereafter. In concomitant with the production of CSF activity in the infected mouse sera, large granular cells bearing high intensity of Mac-2 antigen increased in the infected mouse spleen. These cells were nylon nonadherent and displayed inhibitory effect on T cell response to Con A. These findings indicate that T. cruzi infection induces augmentation of in vivo CSF production, leading to the abnormal proliferation of CSF-responding cells and that augmented production of, and responsiveness to, CSF might be one of important mechanisms responsible for the induction of immune abnormalities in T. cruzi-infected mice.

Citations

May 17, 2012·PloS One·Tor A StrandHalvor Sommerfelt

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