Show simple item record Cantero, Maria del Rocio Cantiello, Horacio Fabio 2017-02-22T19:57:26Z 2011-06
dc.identifier.citation Cantero, Maria del Rocio; Cantiello, Horacio Fabio; Effect of lithium on the electrical properties of polycystin-2 (TRPP2); Springer; European Biophysics Journal With Biophysics Letters; 40; 9; 6-2011; 1029-1042
dc.identifier.issn 0175-7571
dc.description.abstract Polycystin-2 (PC2, TRPP2) is a TRP-type, non-selective cation channel whose dysfunction is implicated in changes in primary cilium structure and genesis of autosomal dominant polycystic kidney disease (ADPKD). Lithium (Li+) is a potent pharmaceutical agent whose effect on cell function is largely unknown. In this work, we explored the effect of Li+ on PC2 channel function. In vitro translated PC2 was studied in a lipid bilayer reconstitution system exposed to different chemical conditions such as Li+ or K+ chemical gradients and different symmetrical concentrations of either cation. Li+ inhibited PC2 function only from the external side, by decreasing the single-channel conductance and modifying the reversal potential consistent with both permeability to and blockage of the channel. When a chemical gradient was imposed, the PC2 single-channel conductance was 144 pS and 107 pS for either K+ or Li+, respectively. Data were analysed in terms of the Goldman–Hodgkin–Katz approximation and energy models based on absolute rate theory to understand the mechanism(s) of Li+ transport and blockage of PC2. The 2S3B model better explained the findings, including saturation, anomalous mole fraction, non-linearity of the current–voltage curves under bi-ionic conditions and concentration dependence of permeability ratios. The data indicate that Li+ modifies PC2 channel function, whose effect unmasks a high-affinity binding site for this ion, and an intrinsic asymmetry in the pore structure of the channel. The findings provide insights into possible mechanism(s) of Li+ regulation of ciliary length and dysfunction mediated by this cation.
dc.format application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject lithium
dc.subject PC2
dc.subject primary cilia
dc.subject.classification Otras Ciencias de la Salud
dc.subject.classification Ciencias de la Salud
dc.subject.classification CIENCIAS MÉDICAS Y DE LA SALUD
dc.title Effect of lithium on the electrical properties of polycystin-2 (TRPP2)
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-02-15T14:09:49Z
dc.journal.volume 40
dc.journal.number 9
dc.journal.pagination 1029-1042
dc.journal.pais Alemania
dc.journal.ciudad Berlín
dc.description.fil Fil: Cantero, Maria del Rocio. Universidad de Buenos Aires. Facultad de Odontología; Argentina
dc.description.fil Fil: Cantiello, Horacio Fabio. Harvard University; Estados Unidos. Massachusetts General Hospital East; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title European Biophysics Journal With Biophysics Letters
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/

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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)