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ECB-ART-42378
J Innate Immun 2012 Jan 01;45-6:478-88. doi: 10.1159/000336025.
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Contribution of alternatively activated macrophages to allergic lung inflammation: a tale of mice and men.

Dasgupta P , Keegan AD .


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The concept that macrophages play an active role in inflammatory responses began its development in the late 1800s with the now iconic studies by Elie Metchnikoff using starfish larvae and Daphnia [reviewed in Kaufmann SHE: Nat Immunol 2008;9:705-712 and Cavaillon JM: J Leukoc Biol 2011;90:413-424]. Based on his observation of the phagocyte response to a foreign body (rose thorn) and yeast, he proposed that phagocytes acted in host defense and were active participants in the inflammatory process. Flash forward more than 100 years and we find that these basic tenets hold true. However, it is now appreciated that macrophages come in many different flavors and can adopt a variety of nuanced phenotypes depending on the tissue environment in which the macrophage is found. In this brief review, we discuss the role of one type of macrophage termed the alternatively activated macrophage (AAM), also known as the M2 type of macrophage, in regulating allergic lung inflammation and asthma. Recent studies using mouse models of allergic lung inflammation and samples from human asthma patients contribute to the emerging concept that AAMs are not just bystanders of the interleukin (IL)-4- and IL-13-rich environment found in allergic asthma but are also active players in orchestrating allergic lung disease.

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References [+] :
Agapov, Macrophage chitinase 1 stratifies chronic obstructive lung disease. 2009, Pubmed