Macrophages are ubiquitous phagocytes that can constitute up to 15% of the cellular content of tissues. These heterogeneous cells of the innate immune system perform important functions during health and disease. Equipped with receptors for the T helper cell cytokines INF-γ and IL-4, macrophages undergo specific activation programs during Th1 or Th2 immune responses. These activation profiles, termed classical (M1) or alternative (M2) activation respectively, are further tuned by the presence and recognition of microbial-associated molecular patterns, other cytokines, lipids, and even adhesion to the substratum. The activation of macrophages also relies on the maturation background of the cells, elicitation of complicated intracellular signalling cascades, and the crosstalk between the different signalling elements. Of interest, not all genes participating in the activation-related signalling cascades are equally important for the elicitation of functional profiles and a regulator gene hierarchy is emerging for the different types of activation. In this issue of the European Journal of Immunology, two papers add to our understanding of how cellular kinases and phosphatases, related to the PI3K pathway, regulate M1 or M2 activation programmes in macrophages.
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 February 2012.
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#44
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