Anno2012
AutoriDi Garbo A; Alloisio S; Nobile M
AbstractThe P2X7 receptor (P2X7R) induces ionotropic Ca2 + signalling in different cell types. It plays an important role in the immune response and in the nervous system. Here, the mechanisms underlying intracellular Ca2 + variations evoked by 3'-O-(4-benzoyl)benzoyl-ATP (BzATP), a potent agonist of the P2X7R, in transfected HEK293 cells, are investigated both experimentally and theoretically. We propose a minimal model of P2X7R that is capable of reproducing, qualitatively and quantitatively, the experimental data. This approach was also adopted for the P2X7R variant, which lacks the entire C-terminus tail (trP2X7R). Then we introduce a biophysical model describing the Ca2 + dynamics in HEK293. Our model gives an account of the ionotropic Ca2 + influx evoked by BzATP on the basis of the kinetics model of P2X7R. To explain the complex Ca2 + responses evoked by BzATP, the model predicted that an impairment in Ca2 + extrusion flux through the plasma membrane is a key factor for Ca2 + homeostasis in HEK293 cells.
RivistaPhysical Biology
ISSN1478-3967
Impact factor
Volume9
Pagina inizio
Pagina fine026001
Autori IBFAngelo DI GARBO, Mario NOBILE, Susanna ALLOISIO
Linee di Ricerca IBFMD.P01.001.001, MD.P01.004.001
Sedi IBFIBF.GE, IBF.PI