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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

4.1K
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,...
4.1K
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

2.3K
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...
2.3K
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

2.7K
Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
2.7K
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

3.0K
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...
3.0K
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

3.5K
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...
3.5K
Drugs Acting on Autonomic Ganglia: Blockers01:28

Drugs Acting on Autonomic Ganglia: Blockers

1.9K
Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups:
1.9K

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Updated: Apr 4, 2026

Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology
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Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology

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PD-1ブロック

Jedd D Wolchok1

  • 1Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

Cell
|August 29, 2015
PubMed
まとめ
この要約は機械生成です。

ニボルマブとペンブロリズマブは,プログラム死亡-1 (PD-1) 受容体をブロックする単一クローン抗体です. この免疫療法のアプローチは抗腫瘍免疫反応を抑制し,最近ではメラノーマと非小細胞肺がんの治療に承認されました.

さらに関連する動画

Contractions of Human-iPSC-derived Cardiomyocyte Syncytia Measured with a Ca-sensitive Fluorescent Dye in Temperature-controlled 384-well Plates
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Contractions of Human-iPSC-derived Cardiomyocyte Syncytia Measured with a Ca-sensitive Fluorescent Dye in Temperature-controlled 384-well Plates

Published on: October 18, 2018

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Monitoring PD-1-Blocking Antibodies Bound to T Cells Derived from a Drop of Peripheral Blood
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Monitoring PD-1-Blocking Antibodies Bound to T Cells Derived from a Drop of Peripheral Blood

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関連する実験動画

Last Updated: Apr 4, 2026

Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology
07:04

Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology

Published on: May 2, 2025

1.3K
Contractions of Human-iPSC-derived Cardiomyocyte Syncytia Measured with a Ca-sensitive Fluorescent Dye in Temperature-controlled 384-well Plates
07:42

Contractions of Human-iPSC-derived Cardiomyocyte Syncytia Measured with a Ca-sensitive Fluorescent Dye in Temperature-controlled 384-well Plates

Published on: October 18, 2018

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Monitoring PD-1-Blocking Antibodies Bound to T Cells Derived from a Drop of Peripheral Blood
06:07

Monitoring PD-1-Blocking Antibodies Bound to T Cells Derived from a Drop of Peripheral Blood

Published on: February 5, 2020

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科学分野:

  • 免疫学
  • 腫瘍学
  • 薬理学について

背景:

  • モノクローナル抗体はニボルマブとペムブロリズマブがプログラム死亡-1 (PD-1) 受容体を標的とする.
  • PD-1受容体の阻害は,腫瘍特異の免疫反応を高める.

研究 の 目的:

  • PD-1阻害剤のメカニズムと最近の治療承認を要約する.
  • ガン治療におけるPD-1阻害の役割を強調する.

主な方法:

  • PD-1 阻害剤に関する科学文献のレビュー
  • ニボルマブとペムブロリズマブの臨床試験データの分析

主要な成果:

  • ニボルマブとペンブロリズマブはPD-1受容体を効果的に阻害する.
  • これらの薬は抗腫瘍免疫反応を阻害する.

結論:

  • ニボルマブとペンブロリズマブは,がんの免疫療法における重要な進歩を表しています.
  • 転移性メラノーマと非小細胞肺がんに対する最近の承認は,その臨床的有用性を強調しています.