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10.1042/BJ20101569

http://scihub22266oqcxt.onion/10.1042/BJ20101569
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suck abstract from ncbi


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pmid21309747      Biochem+J 2011 ; 434 (2): 181-8
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  • Beyond the endoplasmic reticulum: atypical GRP78 in cell viability, signalling and therapeutic targeting #MMPMID21309747
  • Ni M; Zhang Y; Lee AS
  • Biochem J 2011[Mar]; 434 (2): 181-8 PMID21309747show ga
  • GRP78 (glucose-regulated protein of 78 kDa) is traditionally regarded as a major ER (endoplasmic reticulum) chaperone facilitating protein folding and assembly, protein quality control, Ca(2+) binding and regulating ER stress signalling. It is a potent anti-apoptotic protein and plays a critical role in tumour cell survival, tumour progression and angiogenesis, metastasis and resistance to therapy. Recent evidence shows that GRP78 can also exist outside the ER. The finding that GRP78 is present on the surface of cancer but not normal cells in vivo represents a paradigm shift on how GRP78 controls cell homoeostasis and provides an opportunity for cancer-specific targeting. Cell-surface GRP78 has emerged as an important regulator of tumour cell signalling and viability as it forms complexes with a rapidly expanding repertoire of cell-surface protein partners, regulating proliferation, PI3K (phosphoinositide 3-kinase)/Akt signalling and cell viability. Evidence is also emerging that GRP78 serves as a receptor for viral entry into host cells. Additionally, a novel cytosolic form of GRP78 has been discovered prominently in leukaemia cells. These, coupled with reports of nucleus- and mitochondria-localized forms of GRP78, point to the previously unanticipated role of GRP78 beyond the ER that may be critical for cell viability and therapeutic targeting.
  • |*Signal Transduction[MESH]
  • |Animals[MESH]
  • |Cell Membrane/metabolism[MESH]
  • |Cell Nucleus/metabolism[MESH]
  • |Cell Survival[MESH]
  • |Cytosol/metabolism[MESH]
  • |Endoplasmic Reticulum Chaperone BiP[MESH]
  • |Endoplasmic Reticulum/*metabolism[MESH]
  • |Heat-Shock Proteins/*metabolism[MESH]
  • |Humans[MESH]
  • |Models, Biological[MESH]


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