Abstract
Ischemic stress of cells within solid tumors arises from inadequate perfusion of regions of the tumor and results in microenvironments which are hypoxic and deficient in nutrient delivery and waste product removal. Stressed cells within these microenvironments show growth inhibition and synthesize unique sets of proteins referred to as glucose and oxygen regulated proteins (GRPs and ORPs respectively). The commonality of proteins induced by glucose-starvation and hypoxia has not been proven. To this end, ORPs were induced in Chinese hamster ovary cells in the presence of high glucose concentration in the media and ORP 80 isolated from two dimension gels. Eleven tryptic peptides of the 80 kDa ORP were sequenced and found to be identical to GRP 78 sequences. The data demonstrate that GRP 78 and ORP 80 have the same primary amino acid sequence and suggest that glucose-starvation and hypoxia can induce the same cellular responses.
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Roll, D.E., Murphy, B.J., Laderoute, K.R. et al. Oxygen regulated 80 kDa protein and glucose regulated 78 kDa protein are identical. Mol Cell Biochem 103, 141–148 (1991). https://doi.org/10.1007/BF00227480
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DOI: https://doi.org/10.1007/BF00227480