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Unfolding the relationship between secreted molecular chaperones and macrophage activation states Henderson B; Henderson SCell Stress Chaperones 2009[Jul]; 14 (4): 329-41Over the last 20 years, it has emerged that many molecular chaperones and protein-folding catalysts are secreted from cells and function, somewhat in the manner of cytokines, as pleiotropic signals for a variety of cells, with much attention being focused on the macrophage. During the last decade, it has become clear that macrophages respond to bacterial, protozoal, parasitic and host signals to generate phenotypically distinct states of activation. These activation states have been termed 'classical' and 'alternative' and represent not a simple bifurcation in response to external signals but a range of cellular phenotypes. From an examination of the literature, the hypothesis is propounded that mammalian molecular chaperones are able to induce a wide variety of alternative macrophage activation states, and this may be a system for relating cellular or tissue stress to appropriate macrophage responses to restore homeostatic equilibrium.|Cytokines/metabolism[MESH]|Macrophage Activation/*physiology[MESH]|Molecular Chaperones/*metabolism[MESH]|Protein Folding[MESH] |
