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Blood, 15 June 2006, Vol. 107, No. 12, pp. 4763-4769.
Prepublished online as a Blood First Edition Paper on March 9, 2006; DOI 10.1182/blood-2005-04-1501.
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IMMUNOBIOLOGY
Adaptive functional differentiation of dendritic cells: integrating the network of extra- and intracellular signals
Thomas Luft,
Elena Rodionova,
Eugene Maraskovsky,
Michael Kirsch,
Michael Hess,
Christian Buchholtz,
Martin Goerner,
Max Schnurr,
Radek Skoda, and
Anthony D. Ho
From the German Cancer Research Center, Dept of Molecular Oncology/Hematology, Heidelberg, Germany; Medizinische Klinik und Poliklinik V, University of Heidelberg, Germany; CSL Limited, Parkville, Victoria, Australia; the Ludwig Institute for Cancer Research, Melbourne, Victoria, Australia; and the Department of Internal Medicine, Division of Gastroenterology, University of Munich, Germany.
Phenotypic maturation, cytokine secretion, and migration are distinct functional characteristics of dendritic cells (DCs). These functions are independently regulated by a number of extracellular variables, such as type, strength, and persistence of an array of soluble and membrane-bound mediators. Since the exact composition of these variables in response to infection may differ between individuals, the intracellular signaling pathways activated by these extracellular networks may more closely correlate with DC function and predict the course of adaptive immunity. We found that activation of p38 kinase (p38K), extracellular signal–related kinase 1/2 (ERK1/2), and phosphatidylcholine-specific phospholipase C (PC-PLC) enhanced cytokine secretion, whereas p38K, cyclic adenosine monophosphate (cAMP), and PC-PLC enhanced migration. In contrast, phosphatidylinositol 3-kinase (PI3K)/Akt-1 and cAMP inhibited cytokine secretion while ERK1/2 inhibited migration. Migration and cytokine secretion further differed in their sensitivity to inhibition over time. However, although DCs could be manipulated to express migration, cytokine secretion, or both, the level of activation or persistence of intracellular pathway signaling was not predictive. Our results suggest a modular organization of function. We hypothesize that the expression of specific DC functions integrates a large variety of activating and inhibitory variables, and is represented by the formation of a functional unit of molecular networks—the signal response module (SRM). The combined activities of these modules define the functional outcome of DC activation.
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