Molecular Evaluation of Endoplasmic Reticulum Homeostasis Meets Humoral Immunity.
Molecular Evaluation of Endoplasmic Reticulum Homeostasis Meets Humoral Immunity.
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DOI:
10.1016/j.tcb.2021.02.004
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发表时间:
2021-07
影响因子:
19
通讯作者:
Sitia R
中科院分区:
文献类型:
--
作者:
van Anken E;Bakunts A;Hu CA;Janssens S;Sitia R
The biosynthesis of about one third of the human proteome, including membrane receptors and secreted proteins, occurs in the endoplasmic reticulum (ER). Conditions that perturb ER homeostasis activate the Unfolded Protein Response (UPR). An ‘optimistic’ UPR output aims at restoring homeostasis by reinforcement of machineries that guarantee efficiency and fidelity of protein biogenesis in the ER. Yet, once the UPR ‘deems’ that ER homeostatic readjustment fails, it transitions to a ‘pessimistic’ output, which—depending on the cell-type—will result in apoptosis. In this essay, we discuss emerging concepts on how the UPR ‘evaluates’ ER stress, how the UPR is repurposed, in particular in B cells, and how UPR-driven counter-selection of cells undergoing homeostatic failure serves organismal homeostasis and humoral immunity.
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