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10.1124/mol.108.048165 http://scihub22266oqcxt.onion/10.1124/mol.108.048165 18511652!2613800!18511652     free     free     free Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Mol+Pharmacol 2008 ; 74 (3): 736-43 Nephropedia Template TP {{tp|p=18511652|t=2008. Sulfonylurea receptor-dependent and -independent pathways mediate vasodilation induced by ATP-sensitive K+ channel openers |pdf=|usr=}}{{18511652}} gab.com Text Sulfonylurea receptor-dependent and -independent pathways mediate vasodilation induced by ATP-sensitive K+ channel openers JO: Mol Pharmacol http://www.kidney.de/pget.php?&tw=1&pmid=18511652 #FOAvip ATP-sensitive K+ (KATP) channel openers are vasodilators that activate both plasma membrane and mitochondrial KATP channels. Here, we investigated the molecular mechanisms by which diazoxide and pinacidil induce vasodilation by studying diameter regulation of wild-type [SUR2(+/+)] and sulfonylurea receptor (SUR) 2-deficient [SUR2(-/-)] mouse myogenic mesenteric arteries. Ryanodine (10 microM), a ryanodine-sensitive Ca2+ release (RyR) channel blocker; iberiotoxin (100 nM), a large-conductance Ca2+-activated K+ (KCa) channel blocker; 4-aminopyridine (4-AP; 1 mM), a voltage-gated K+ (KV) channel blocker; manganese(III) tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP; 100 microM), an antioxidant; and a combination of ryanodine and 4-AP reduced diazoxide (100 microM)-induced dilation in pressurized (60 mm Hg) SUR2(+/+) arteries by 45 to 77%. In contrast, these inhibitors did not alter pinacidil (5 microM)-induced dilation in SUR2(+/+) arteries. Reverse transcription-polymerase chain reaction indicated that SUR2B was the only SUR isoform expressed in SUR2(+/+) mesenteric artery smooth muscle cells, whereas SURs were absent in SUR2(-/-) cells. In SUR2(-/-) arteries, pinacidil-induced vasodilation was 10% of that in SUR2(+/+) arteries, whereas diazoxide-induced vasodilation was similar in SUR2(+/+) and SUR2(-/-) arteries. Atpenin (1 microM), a selective electron transport chain (ETC) complex II inhibitor, dilated arteries similarly to diazoxide, and this effect was attenuated by MnTMPyP and ryanodine + 4-AP. Atpenin also attenuated diazoxide-, but not pinacidil-induced vasodilation. In summary, data indicate that pinacidil-induced vasodilation requires SUR2B, whereas diazoxide-induced vasodilation does not require SURs. Rather, diazoxide-induced vasodilation involves ETCII inhibition; a smooth muscle cell-reactive oxygen species elevation; and RyR, KCa, and KV channel activation. These data indicate that KATP channel openers regulate arterial diameter via SUR-dependent and -independent pathways. Twit Text FOAVip Sulfonylurea receptor-dependent and -independent pathways mediate vasodilation induced by ATP-sensitive K+ channel openers ????Mol Pharmacol http://www.kidney.de/pget.php?&tw=1&pmid=18511652 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=18511652 #FOAvip English Wikipedia <ref>{{Cite pmid|18511652}}</ref> Sulfonylurea receptor-dependent and -independent pathways mediate vasodilation induced by ATP-sensitive K+ channel openers #MMPMID18511652 Adebiyi A; McNally EM; Jaggar JH Mol Pharmacol 2008[Sep]; 74 (3): 736-43 PMID18511652show ga ATP-sensitive K+ (KATP) channel openers are vasodilators that activate both plasma membrane and mitochondrial KATP channels. Here, we investigated the molecular mechanisms by which diazoxide and pinacidil induce vasodilation by studying diameter regulation of wild-type [SUR2(+/+)] and sulfonylurea receptor (SUR) 2-deficient [SUR2(-/-)] mouse myogenic mesenteric arteries. Ryanodine (10 microM), a ryanodine-sensitive Ca2+ release (RyR) channel blocker; iberiotoxin (100 nM), a large-conductance Ca2+-activated K+ (KCa) channel blocker; 4-aminopyridine (4-AP; 1 mM), a voltage-gated K+ (KV) channel blocker; manganese(III) tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP; 100 microM), an antioxidant; and a combination of ryanodine and 4-AP reduced diazoxide (100 microM)-induced dilation in pressurized (60 mm Hg) SUR2(+/+) arteries by 45 to 77%. In contrast, these inhibitors did not alter pinacidil (5 microM)-induced dilation in SUR2(+/+) arteries. Reverse transcription-polymerase chain reaction indicated that SUR2B was the only SUR isoform expressed in SUR2(+/+) mesenteric artery smooth muscle cells, whereas SURs were absent in SUR2(-/-) cells. In SUR2(-/-) arteries, pinacidil-induced vasodilation was 10% of that in SUR2(+/+) arteries, whereas diazoxide-induced vasodilation was similar in SUR2(+/+) and SUR2(-/-) arteries. Atpenin (1 microM), a selective electron transport chain (ETC) complex II inhibitor, dilated arteries similarly to diazoxide, and this effect was attenuated by MnTMPyP and ryanodine + 4-AP. Atpenin also attenuated diazoxide-, but not pinacidil-induced vasodilation. In summary, data indicate that pinacidil-induced vasodilation requires SUR2B, whereas diazoxide-induced vasodilation does not require SURs. Rather, diazoxide-induced vasodilation involves ETCII inhibition; a smooth muscle cell-reactive oxygen species elevation; and RyR, KCa, and KV channel activation. These data indicate that KATP channel openers regulate arterial diameter via SUR-dependent and -independent pathways. |ATP-Binding Cassette Transporters/*metabolism[MESH] |Adenosine Triphosphate/*pharmacology[MESH] |Animals[MESH] |Blood Pressure/drug effects[MESH] |Diazoxide/pharmacology[MESH] |Electron Transport Complex II/antagonists & inhibitors[MESH] |Endothelium/drug effects/metabolism[MESH] |In Vitro Techniques[MESH] |Ion Channel Gating/drug effects[MESH] |Membrane Transport Modulators/*pharmacology[MESH] |Mesenteric Arteries/cytology/drug effects[MESH] |Mice[MESH] |Muscle Cells/drug effects/metabolism[MESH] |Pinacidil/pharmacology[MESH] |Potassium Channels, Inwardly Rectifying/deficiency/*metabolism[MESH] |Potassium Channels/*metabolism[MESH] |Protein Subunits/metabolism[MESH] |Receptors, Drug/deficiency/*metabolism[MESH] |Ryanodine Receptor Calcium Release Channel/metabolism[MESH] |Sulfonylurea Receptors[MESH]Sulfonylurea receptor-dependent and -independent pathways mediate vaso(epmc).pdf DeepDyve Pubget Overpricing