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. 2005 Oct 21;123(2):321-34.
doi: 10.1016/j.cell.2005.08.032.

Cell-surface calreticulin initiates clearance of viable or apoptotic cells through trans-activation of LRP on the phagocyte

Shyra J Gardai  1 , Kathleen A McPhillips, S Courtney Frasch, William J Janssen, Anna Starefeldt, Joanne E Murphy-Ullrich, Donna L Bratton, Per-Arne Oldenborg, Marek Michalak, Peter M Henson
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"VSports在线直播" Cell-surface calreticulin initiates clearance of viable or apoptotic cells through trans-activation of LRP on the phagocyte

Shyra J Gardai (VSports最新版本) et al. Cell. .
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Abstract

Apoptotic-cell removal is critical for development, tissue homeostasis, and resolution of inflammation. Although many candidate systems exist, only phosphatidylserine has been identified as a general recognition ligand on apoptotic cells. We demonstrate here that calreticulin acts as a second general recognition ligand by binding and activating LDL-receptor-related protein (LRP) on the engulfing cell. Since surface calreticulin is also found on viable cells, a mechanism preventing inadvertent uptake was sought. Disruption of interactions between CD47 (integrin-associated protein) on the target cell and SIRPalpha (SHPS-1), a heavily glycosylated transmembrane protein on the engulfing cell, permitted uptake of viable cells in a calreticulin/LRP-dependent manner. On apoptotic cells, CD47 was altered and/or lost and no longer activated SIRPalpha VSports手机版. These changes on the apoptotic cell create an environment where "don't eat me" signals are rendered inactive and "eat me" signals, including calreticulin and phosphatidylserine, congregate together and signal for removal. .

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