Parathyroid hypertensive factor inhibits voltage-gated K+ channels in vascular smooth muscle cells
Parathyroid hypertensive factor (PHF) has been implicated in regulation of vascular smooth muscle tone and pathogenesis of several forms of hypertension. Earlier studies have suggested that PHF enhances the actions of other vasoconstrictors, while it has no in vitro vasoconstrictor property of its own. PHF was previously found to enhance the L-type Ca channel currents and intracellular Ca responses to depolarization in vascular smooth muscle cells (VSMCs). The present study examined whether PHF might act on K channels in the plasma membrane of VSMCs. Primary cultured VSMCs from rat tail artery were used. The whole-cell version of the patch-clamp technique was used under conditions in which there was no contribution of Ca-activated K channels to the outward current. Both purified and semipurified PHF inhibited the delayed rectifier type potassium current in a dose-dependent manner. The effect was time dependent and was first significantly different from the control current after 30 min. The inhibition of the delayed rectifier K channel was associated with a time-dependent decrease in the resting membrane potential. Therefore, PHF may alter VSMC cellular Ca responses by reducing the membrane potential to a level closer to the activation potential of Ca channels.
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
1999 |
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| Erschienen: |
1999 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:77 |
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| Enthalten in: |
Canadian journal of physiology and pharmacology - 77(1999), 11 vom: 29. Nov., Seite 860-5 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Ren, J [VerfasserIn] |
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| Anmerkungen: |
Date Completed 30.12.1999 Date Revised 21.11.2013 published: Print Citation Status MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM105235121 |
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| 100 | 1 | |a Ren, J |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Parathyroid hypertensive factor inhibits voltage-gated K+ channels in vascular smooth muscle cells |
| 264 | 1 | |c 1999 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ohne Hilfsmittel zu benutzen |b n |2 rdamedia | ||
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| 500 | |a Date Completed 30.12.1999 | ||
| 500 | |a Date Revised 21.11.2013 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Parathyroid hypertensive factor (PHF) has been implicated in regulation of vascular smooth muscle tone and pathogenesis of several forms of hypertension. Earlier studies have suggested that PHF enhances the actions of other vasoconstrictors, while it has no in vitro vasoconstrictor property of its own. PHF was previously found to enhance the L-type Ca channel currents and intracellular Ca responses to depolarization in vascular smooth muscle cells (VSMCs). The present study examined whether PHF might act on K channels in the plasma membrane of VSMCs. Primary cultured VSMCs from rat tail artery were used. The whole-cell version of the patch-clamp technique was used under conditions in which there was no contribution of Ca-activated K channels to the outward current. Both purified and semipurified PHF inhibited the delayed rectifier type potassium current in a dose-dependent manner. The effect was time dependent and was first significantly different from the control current after 30 min. The inhibition of the delayed rectifier K channel was associated with a time-dependent decrease in the resting membrane potential. Therefore, PHF may alter VSMC cellular Ca responses by reducing the membrane potential to a level closer to the activation potential of Ca channels | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 7 | |a Biological Factors |2 NLM | |
| 650 | 7 | |a Delayed Rectifier Potassium Channels |2 NLM | |
| 650 | 7 | |a Potassium Channel Blockers |2 NLM | |
| 650 | 7 | |a Potassium Channels |2 NLM | |
| 650 | 7 | |a Potassium Channels, Voltage-Gated |2 NLM | |
| 650 | 7 | |a parathyroid hypertensive factor |2 NLM | |
| 650 | 7 | |a Calcium |2 NLM | |
| 650 | 7 | |a SY7Q814VUP |2 NLM | |
| 700 | 1 | |a Zhang, L |e verfasserin |4 aut | |
| 700 | 1 | |a Benishin, C G |e verfasserin |4 aut | |
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