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  • Title: Pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid can antagonize the purinoceptor-mediated inhibition of M-current in bullfrog sympathetic neurons.
    Author: Meng H, Sakakibara M, Nakazawa H, Tokimasa T.
    Journal: Neurosci Lett; 2003 Feb 06; 337(2):93-6. PubMed ID: 12527396.
    Abstract:
    Whole-cell recordings of an M-type potassium current (I(M)) were made from dissociated bullfrog sympathetic neurons. Purinoceptor agonists inhibited I(M) with UTP>ADP>adenosine triphosphate=UDP>ATPgammaS=guanosine triphosphate (GTP)>>amyloid precursor protein (APP)(NH)P as the rank order of potency. The IC(50) was 35 nM for UTP, and 2.6 microM for GTP. Under conditions in which I(M) was abolished by UTP (1 microM), a sulfonic acid derivative, pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid (PPADS) (30-300 microM) recruited I(M) to 15 to 90% of its control in a reversible and concentration-dependent manner. These results indicate that PPADS can be useful as an antagonist for the purinoceptors presumably P2Y subtypes in amphibian autonomic neurons.
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