Moura, GEDD, Lucena, SV, Lima, MA, Nascimento, FD, Gesteira, TF, Nader, HB, Paredes-Gamero, EJ and Tersariol, ILS (2015) Post-translational allosteric activation of the P2X 7 receptor through glycosaminoglycan chains of CD44 proteoglycans. Cell Death Discovery, 1. 15005 - 15005. ISSN 2058-7716

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Here, we present evidence for the positive allosteric modulation of the P2X7 receptor through glycosaminoglycans (GAGs) in CHO (cell line derived from the ovary of the Chinese hamster) cells. The marked potentiation of P2X7 activity through GAGs in the presence of non-saturating agonists concentrations was evident with the endogenous expression of the receptor in CHO cells. The presence of GAGs on the surface of CHO cells greatly increased the sensitivity to adenosine 5′-triphosphate and changed the main P2X7 receptor kinetic parameters EC50, Hill coefficient and Emax. GAGs decreased the allosteric inhibition of P2X7 receptor through Mg2+. GAGs activated P2X7 receptor-mediated cytoplasmic Ca2+ influx and pore formation. Consequently, wild-type CHO-K1 cells were 2.5-fold more sensitive to cell death induced through P2X7 agonists than mutant CHO-745 cells defective in GAGs biosynthesis. In the present study, we provide the first evidence that the P2X7 receptor interacts with CD44 on the CHO-K1 cell surface. Thus, these data demonstrated that GAGs positively modulate the P2X7 receptor, and sCD44 is a part of a regulatory positive feedback loop linking P2X7 receptor activation for the intracellular response mediated through P2X7 receptor stimulation.

Item Type: Article
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Uncontrolled Keywords: cell death; glycobiology; ligand-gated ion channels; oncogenes
Subjects: Q Science > QH Natural history
Divisions: Faculty of Natural Sciences > School of Life Sciences
Depositing User: Symplectic
Date Deposited: 29 May 2019 15:32
Last Modified: 30 May 2019 11:05

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