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Immunobiology. 1994 Oct;191(4-5):424-31.

Macrophage activation and innate resistance to infection in SCID mice.

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Department of Clinical Sciences, London School of Hygiene and Tropical Medicine, England.


Resistance to infection against a variety of pathogens requires the co-ordinated interaction of both the innate and acquired immune responses. Mice bearing the SCID mutation are devoid of T and B cells but retain elements of the innate immune system including natural killer (NK) cells, macrophages, granulocytes and complement proteins. Using the SCID model we have identified a T cell independent mechanism of macrophage activation mediated by the secretion of IFN-gamma from NK cells. This process occurs in response to a variety of parasites and bacteria including Listeria monocytogenes, and is strictly regulated both in vitro and in vivo by cytokines such as IL-2 and IL-10. Here we discuss the mechanisms of NK cell activation and regulation and describe a new model of opportunistic infection in SCID mice with the AIDS related pathogen Cryptosporidium parvum.

[Indexed for MEDLINE]

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