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Dev Cell. 2003 Sep;5(3):441-50.

Signaling role of hemocytes in Drosophila JAK/STAT-dependent response to septic injury.

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  • 1Department of Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA. agaisse@rascal.med.harvard.edu

Abstract

To characterize the features of JAK/STAT signaling in Drosophila immune response, we have identified totA as a gene that is regulated by the JAK/STAT pathway in response to septic injury. We show that septic injury triggers the hemocyte-specific expression of upd3, a gene encoding a novel Upd-like cytokine that is necessary for the JAK/STAT-dependent activation of totA in the Drosophila counterpart of the mammalian liver, the fat body. In addition, we demonstrate that totA activation also requires the NF-KB-like Relish pathway, indicating that fat body cells integrate the activity of NF-KB and JAK/STAT signaling pathways upon immune response. This study reveals that, in addition to the pattern recognition receptor-mediated NF-KB-dependent immune response, Drosophila undergoes a complex systemic response that is mediated by the production of cytokines in blood cells, a process that is similar to the acute phase response in mammals.

PMID:
12967563
[PubMed - indexed for MEDLINE]
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