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Research Article

Intracellular growth inhibition of Histoplasma capsulatum induced in murine macrophages by recombinant gamma interferon is not due to a limitation of the supply of methionine or cysteine to the fungus.

B A Wu-Hsieh, D H Howard
B A Wu-Hsieh
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D H Howard
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ABSTRACT

Recombinant murine gamma interferon (rMuIFN-gamma) stimulates mouse peritoneal macrophages to inhibit the intracellular growth of the zoopathogenic fungus Histoplasma capsulatum. In some systems, the inhibition of growth of an intracellular parasite by rIFN-gamma has been related to nutritional constraints induced in the host cells by the lymphokine. Such an explanation might apply to H. capsulatum because the fungus is a functional methionine-cysteine (Met-Cys) auxotroph at 37 degrees C; its sulfite reductase is repressed at that temperature. For this reason, we set about to examine whether or not the antihistoplasma state induced in rMuIFN-gamma is due to a restriction in the availability of Met-Cys. Omission of Met-Cys from the medium in which macrophages were cultivated prevented H. capsulatum from growing within them. Addition of Met or Cys to the macrophage cultures did not antagonize the inhibitory effect induced in the cells by rMuIFN-gamma. Thus, there was no evidence from our work that rMuIFN-gamma evokes the antihistoplasma effect in mouse peritoneal macrophages by limiting the supply of Met-Cys to the fungus.

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Intracellular growth inhibition of Histoplasma capsulatum induced in murine macrophages by recombinant gamma interferon is not due to a limitation of the supply of methionine or cysteine to the fungus.
B A Wu-Hsieh, D H Howard
Infection and Immunity Feb 1992, 60 (2) 698-700; DOI:

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Intracellular growth inhibition of Histoplasma capsulatum induced in murine macrophages by recombinant gamma interferon is not due to a limitation of the supply of methionine or cysteine to the fungus.
B A Wu-Hsieh, D H Howard
Infection and Immunity Feb 1992, 60 (2) 698-700; DOI:
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