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2006: Popov Alexey; Abdullah Zeinab; Wickenhauser Claudia; Saric Tomo; Driesen Julia; Hanisch Franz-Georg; Domann Eugen; Raven Emma Lloyd; Dehus Oliver; Hermann Corinna; Eggle Daniela; Debey Svenja; Chakraborty Trinad; Krönke Martin; Utermöhlen Olaf; Schultze Joachim L
Indoleamine 2,3-dioxygenase-expressing dendritic cells form suppurative granulomas following Listeria monocytogenes infection.
The Journal of clinical investigation 2006;116(12):3160-70.
Control of pathogens by formation of abscesses and granulomas is a major strategy of the innate immune system, especially when effector mechanisms of adaptive immunity are insufficient. We show in human listeriosis that DCs expressing indoleamine 2,3-dioxygenase (IDO), together with macrophages, are major cellular components of suppurative granulomas in vivo. Induction of IDO by DCs is a cell-autonomous response to Listeria monocytogenes infection and was also observed in other granulomatous infections with intracellular bacteria, such as Bartonella henselae. Reporting on our use of the clinically applied anti-TNF-alpha antibody infliximab, we further demonstrate in vitro that IDO induction is TNF-alpha dependent. Repression of IDO therefore might result in exacerbation of granulomatous diseases observed during anti-TNF-alpha therapy. These findings place IDO(+) DCs not only at the intersection of innate and adaptive immunity but also at the forefront of bacterial containment in granulomatous infections.

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