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Title

Separation of solubilized A2 adenosine receptors of human platelets from non-receptor [3H]NECA binding sites by gel filtration

Authors
Lohse, Martin J.
Lindenborn-Fotinos, Jutta
Klotz, Karl Norbert
Schwabe, Ulrich
Published in Naunyn-Schmiedeberg's Archives of Pharmacology. 1988, vol. 337, no. 1, p. 64-8
Abstract Human platelet membranes were solubilized with the zwitterionic detergent CHAPS (3-[3-(cholamidopropyl)-dimethylammonio]-1-propanesulfonate) and the solubilized extract subjected to gel filtration. Binding of the adenosine receptor agonist [3H]NECA (5'-N-ethylcarboxamidoadenosine) was measured to the eluted fractions. Two [3H]NECA binding peaks were eluted, the first of them with the void volume. This first peak represented between 10% and 25% of the [3H]NECA binding activity eluted from the column. It bound [3H]NECA in a reversible, saturable and GTP-dependent manner with an affinity of 46 nmol/l and a binding capacity of 510 fmol/mg protein. Various adenosine receptor ligands competed for the binding of [3H]NECA to the first peak with a pharmacological profile characteristic for the A2 adenosine receptor as determined from adenylate cyclase experiments. In contrast, most adenosine receptor ligands did not compete for [3H]NECA binding to the second, major peak. These results suggest that a solubilized A2 receptor-Gs protein complex of human platelets can be separated from other [3H]NECA binding sites by gel filtration. This allows reliable radioligand binding studies of the A2 adenosine receptor of human platelets.
Keywords Adenosine/analogs & derivatives/metabolismAdenosine-5'-(N-ethylcarboxamide)Binding SitesBlood Platelets/metabolismCholic AcidsChromatography, GelHumansRadioligand AssayReceptors, Adrenergic, alpha/isolation & purificationSolubility
Stable URL http://archive-ouverte.unige.ch/unige:1358
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PMID: 2835689
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Deposited on : 2009-04-25

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