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ZD0947, a Sulphonylurea Receptor Modulator, Detects Functional Sulphonylurea Receptor Subunits in Murine Vascular Smooth Muscle ATP-sensitive K

ZD0947, a Sulphonylurea Receptor Modulator, Detects Functional Sulphonylurea Receptor Subunits in Murine Vascular Smooth Muscle ATP-sensitive K

Tadashi Yamamoto, Kohei Takahara, Keiichiro Uchida, Noriyoshi Teramoto

Eur J Pharmacol. 2017 Apr 5;800:34-39.

PMID: 28213290

Abstract:

In order to identify functional sulphonylurea receptor (SUR.x) subunits of native ATP-sensitive K+ channels (KATP channels) in mouse portal vein, the effects of ZD0947, a SUR.x modulator, were investigated on spontaneous portal vein contractions, macroscopic membrane currents and unitary currents recorded (using patch-clamp techniques) in freshly dispersed mouse portal vein myocytes. Spontaneous contractions in mouse portal vein were reversibly reduced by ZD0947 in a concentration-dependent manner (Ki =293nM). The relaxation elicited by 3µM ZD0947 was antagonized by the additional application of glibenclamide (300nM), but not gliclazide (100-300nM). In the conventional whole-cell configuration, 100µM ZD0947 elicited inward glibenclamide-sensitive currents at a holding potential of -60mV that demonstrated selectivity for K+(i.e. KATP currents). The peak amplitude of the membrane current elicited by 30µM or 100µM ZD0947 was smaller than that elicited by 100µM pinacidil at -60mV. In the cell-attached mode, 100µM ZD0947 activated glibenclamide-sensitive K+ channels with a conductance (35 pS) similar to that of recombinant Kir6.1/SUR2B channels that were expressed in HEK293 cells and activated by 100µM ZD0947. These results demonstrate that ZD0947 caused a significant vascular relaxation through the activation of KATP channels and that SUR2B may be the major functional subunit of SUR.x in mouse portal vein KATP channels, based on its pharmacological selectivity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP172649400	ZD0947		172649-40-0	Price

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