皮佩林对BK通道的子单位特异性抑制
Aravind Kshatri1, Belinda Rivero-Pérez1, Teresa Giraldez1
1Department of Basic Medical Sciences, Medical School, Universidad de La Laguna, Tenerife, Spain; Instituto de Tecnologias Biomedicas, Universidad de La Laguna, Tenerife, Spain.
Biophysical journal
|September 13, 2023
概括
黑胡中的皮佩林抑制了电导性较大的激活 (BK) 通道,特别是BKα和BKαβ子单元. 它不会影响BKαγ子单元,揭示了研究BK通道调节的新工具.
科学领域:
- 药理学 药理学是指药理学的学科.
- 分子生物学分子生物学
- 离子通道生理学 离子通道生理学
背景情况:
- 黑胡的类化合物皮佩林 (Piperine) 具有多种药理效应,包括离子通道调节.
- 大导电激活 (BK) 通道对于许多生理过程至关重要,因为它们的广泛组织表达.
研究的目的:
- 为了研究 piperine 对不同组成的 BK 通道的影响.
- 阐明 piperine 与 BK 通道子单元相互作用的机制.
主要方法:
- HEK293T细胞表达了各种BK通道亚单元组合 (BKα,BKαβ1,4,BKαγ1,3).
- 电生理学记录用于测量BK通道电流.
- 局部定向的突变发生和域删除,以确定皮佩林相互作用的关键区域.
主要成果:
- 皮佩林在零中可逆抑制了BKα通道电流,以剂量依赖的方式 (IC50 = 4.8 μM).
- 减弱的皮佩林对BKα通道的抑制作用.
- 皮佩林的抑制依赖于BKα的细胞质域,并未受到β亚单元的改变,但由γ1和γ3亚单元减少.
- 皮皮林调节了BKα/BKαβ1,4但不是BKαγ1,3通道.
结论:
- 皮佩林是BKα和BKαβ1,4通道的强大的调节器,但不是BKαγ1,3通道.
- 皮佩林的作用机制是全性,与已知的BK通道阻塞剂不同.
- 皮皮林为研究其子单元的BK通道调节提供了一个新的药理学工具.
更多相关视频
相关概念视频
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers
1.4K
Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
1.4K
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers
1.0K
Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
1.0K
Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action
1.9K
Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
1.9K
Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers
912
Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline...
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline...
912
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
770
Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
770
Depolarizing Blockers: Mechanism of Action
1.6K
Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
1.6K


