TY - JOUR
T1 - Specific recognition of apoptotic cells reveals a ubiquitous and unconventional innate immunity
AU - Cvetanovic, Marija
AU - Mitchell, Justin E.
AU - Patel, Vimal
AU - Avner, Benjamin S.
AU - Su, Yan
AU - Van Der Saag, Paul T.
AU - Witte, Pamela L.
AU - Fiore, Stefano
AU - Levine, Jerrold S.
AU - Ucker, David S.
PY - 2006/7/21
Y1 - 2006/7/21
N2 - The purpose of physiological cell death is the noninflammatory clearance of cells that have become inappropriate or nonfunctional. Consistent with this function, the recognition of apoptotic cells by professional phagocytes, including macrophages and dendritic cells, triggers a set of potent anti-inflammatory responses manifest on multiple levels. The immediate-early inhibition of proinflammatory cytokine gene transcription in the phagocyte is a proximate consequence of recognition of the apoptotic corpse, independent of subsequent engulfment and soluble factor involvement. Here, we show that recognition is linked to a characteristic signature of responses, including MAPK signaling events and the ablation of proinflammatory transcription and cytokine secretion. Specific recognition and response occurs without regard to the origin (species, tissue type, or suicidal stimulus) of the apoptotic cell and does not involve Toll-like receptor signaling. These features mark this as an innate immunity fundamentally distinct from the discrimination of "self" versus "other" considered to be the hallmark of conventional immunity. This profound unconventional innate immune discrimination of effete from live cells is as ubiquitous as apoptotic cell death itself, manifest by professional and nonprofessional phagocytes and nonphagocytic cell types alike. Innate apoptotic immunity provides an intrinsic anti-inflammatory circuit that attenuates proinflammatory responses dynamically and may act systemically as a powerful physiological regulator of immunity.
AB - The purpose of physiological cell death is the noninflammatory clearance of cells that have become inappropriate or nonfunctional. Consistent with this function, the recognition of apoptotic cells by professional phagocytes, including macrophages and dendritic cells, triggers a set of potent anti-inflammatory responses manifest on multiple levels. The immediate-early inhibition of proinflammatory cytokine gene transcription in the phagocyte is a proximate consequence of recognition of the apoptotic corpse, independent of subsequent engulfment and soluble factor involvement. Here, we show that recognition is linked to a characteristic signature of responses, including MAPK signaling events and the ablation of proinflammatory transcription and cytokine secretion. Specific recognition and response occurs without regard to the origin (species, tissue type, or suicidal stimulus) of the apoptotic cell and does not involve Toll-like receptor signaling. These features mark this as an innate immunity fundamentally distinct from the discrimination of "self" versus "other" considered to be the hallmark of conventional immunity. This profound unconventional innate immune discrimination of effete from live cells is as ubiquitous as apoptotic cell death itself, manifest by professional and nonprofessional phagocytes and nonphagocytic cell types alike. Innate apoptotic immunity provides an intrinsic anti-inflammatory circuit that attenuates proinflammatory responses dynamically and may act systemically as a powerful physiological regulator of immunity.
UR - http://www.scopus.com/inward/record.url?scp=33745992279&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33745992279&partnerID=8YFLogxK
U2 - 10.1074/jbc.M603920200
DO - 10.1074/jbc.M603920200
M3 - Article
C2 - 16707494
AN - SCOPUS:33745992279
SN - 0021-9258
VL - 281
SP - 20055
EP - 20067
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 29
ER -