Inducible expression of double-stranded RNA reveals a role for dFADD in the regulation of the antibacterial response in Drosophila adults

Autor: Bruno Lemaitre, Ryu Ueda, Sheila Vidal, Kaoru Saigo, François Leulier
Rok vydání: 2002
Předmět:
Zdroj: Current biology : CB. 12(12)
ISSN: 0960-9822
Popis: In Drosophila, the immune deficiency (Imd) pathway controls antibacterial peptide gene expression in the fat body in response to Gram-negative bacterial infection [1, 2]. The ultimate target of the Imd pathway is Relish, a transactivator related to mammalian P105 and P100 NF-κB precursors [3]. Relish is processed in order to translocate to the nucleus, and this cleavage is dependent on both Dredd, an apical caspase related to caspase-8 of mammals, and the fly Iκ-B kinase complex (dmIKK) [4–9]. dTAK1, a MAPKKK, functions upstream of the dmIKK complex and downstream of Imd, a protein with a death domain similar to that of mammalian receptor interacting protein (RIP) [10, 11]. Finally, the peptidoglycan recognition protein-LC (PGRP-LC) acts upstream of Imd and probably functions as a receptor for the Imd pathway [12–14]. Using inducible expression of dFADD double-stranded RNA, we demonstrate that dFADD is a novel component of the Imd pathway: dFADD double-stranded RNA expression reduces the induction of antibacterial peptide-encoding genes after infection and renders the fly susceptible to Gram-negative bacterial infection. Epistatic studies indicate that dFADD acts between Imd and Dredd. Our results reinforce the parallels between the Imd and the TNF-R1 pathways.
Databáze: OpenAIRE