A Phos-tag-based approach reveals the extent of physiological endoplasmic reticulum stress.

A Phos-tag-based approach reveals the extent of physiological endoplasmic reticulum stress.
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DOI:
10.1371/journal.pone.0011621
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发表时间:
2010-07-16
期刊:
影响因子:
3.7
通讯作者:
Qi L
Qi L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yang L;Xue Z;He Y;Sun S;Chen H;Qi L

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细胞对内质网(ER)应激的反应或未折叠蛋白反应(UPR)是与许多人类疾病相关的关键防御机制。尽管它的基本和临床的重要性,由生理和病理生理条件造成的ER应激的程度仍然难以量化,构成了一个巨大的障碍,阻碍了我们进一步了解生理UPR及其未来的治疗潜力。在这里,我们优化了基于Phos标签的系统,以检测ER膜上两个近端UPR传感器的激活状态。该方法允许定量评估ER中的应力水平。我们的数据定量地揭示了组织特异性基础ER应激的程度以及错误折叠蛋白质的积累和禁食-再喂养周期引起的ER应激。我们的研究可能为未来生理性UPR的研究奠定基础,有助于ER相关疾病的诊断,并改善和促进体内靶向UPR的治疗策略。
Cellular response to endoplasmic reticulum (ER) stress or unfolded protein response (UPR) is a key defense mechanism associated with many human diseases. Despite its basic and clinical importance, the extent of ER stress inflicted by physiological and pathophysiological conditions remains difficult to quantitate, posing a huge obstacle that has hindered our further understanding of physiological UPR and its future therapeutic potential. Here we have optimized a Phos-tag-based system to detect the activation status of two proximal UPR sensors at the ER membrane. This method allowed for a quantitative assessment of the level of stress in the ER. Our data revealed quantitatively the extent of tissue-specific basal ER stress as well as ER stress caused by the accumulation of misfolded proteins and the fasting-refeeding cycle. Our study may pave the foundation for future studies on physiological UPR, aid in the diagnosis of ER-associated diseases and improve and facilitate therapeutic strategies targeting UPR in vivo.
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