PMID: 7540747Mar 1, 1995Paper

Nonselective cationic currents elicited by extracellular ATP in human B-lymphocytes

Pflügers Archiv : European journal of physiology
F BretschneiderF Markwardt

Abstract

Adenosine 5'-triphosphate-(ATP)-induced whole-cell currents were studied in human B-lymphocytes, transformed by the Epstein-Barr virus, by means of the tight-seal voltage-clamp technique. During bath application of ATP, the membrane conductance was increased. The change of membrane conductance occurred within milliseconds. The dose response relationship for the ATP(4-)-elicited membrane current (Ip) was fitted by the Hill function with a Hill coefficient of 1 and a KD value of 0.2 mmol/l. Adenosine, as well as the Mg(2+)-bound form of ATP, did not effect the membrane conductance. Ip did not desensitize within 1 min and could be evoked repeatedly up to 100 times in 1 cell in the presence of the G-protein blocker Guanosine 5'-o-(2-thiodiphosphate) (GDP [beta S]). Therefore, it seems that ion channels in form of P2Z-purinoceptors are involved in the observed effects. The permeability (P) sequence for cations carrying Ip was PCa:PK:PCs:PNa:PTRIS = 35:2:1.2:1:0.1. The reversal potential of IP was not changed by substitution of intracellular Cl- for aspartate, indicating that anions are not involved in the purinoceptor-dependent conductance. A single-channel conductance of P2Z-receptor-dependent ion channels of about 3 pS was determi...Continue Reading

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Citations

May 19, 2006·Pflügers Archiv : European journal of physiology·Terrance M EganZhiyuan Li
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Nov 2, 2020·Biochemical Pharmacology·Fritz Markwardt

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