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Related Concept Videos

Drug Classes and Categories01:25

Drug Classes and Categories

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Drugs can be classified according to their chemical composition or their intended therapeutic application. For instance, anti-infective agents that possess the ability to eliminate pathogens or suppress their growth and reproduction can be grouped based on the organisms they target or their chemical structure. Furthermore, drugs can be divided into prescription, nonprescription, or controlled substances. Prescription medications, such as antibiotics, require oversight from a licensed healthcare...
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Antibody Structure and Classes01:25

Antibody Structure and Classes

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Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
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Antihypertensive Drugs: Thiazide-Class Diuretics01:15

Antihypertensive Drugs: Thiazide-Class Diuretics

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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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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,...
3.0K
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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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...
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Related Experiment Video

Updated: Feb 2, 2026

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis
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Flu DRiPs in MHC Class I Immunosurveillance.

Jiajie Wei1, Jonathan W Yewdell2

  • 1Cellular Biology Section, Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20892, USA.

Virologica Sinica
|November 21, 2018
PubMed
Summary

Defective ribosomal products (DRiPs) generate viral peptides for CD8+ T cell immune surveillance. This review examines DRiP generation from influenza A virus and discusses future research directions.

Keywords:
DRiPImmune responsesInfluenza A virus (IAV)MHC class IMHC-restricted cytotoxicity

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Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
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Last Updated: Feb 2, 2026

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis
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Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
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Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • The defective ribosomal product (DRiP) hypothesis, proposed in 1996, highlights the role of aberrant protein synthesis in immune responses.
  • DRiPs are increasingly recognized as significant contributors to the pool of antigenic peptides presented to T cells.

Purpose of the Study:

  • To review studies on the generation of antigenic peptides from influenza A virus-encoded DRiPs.
  • To discuss the unresolved questions surrounding the co-translational generation of these peptides.
  • To speculate on future research avenues in this field.

Main Methods:

  • Literature review of studies investigating DRiP biogenesis and peptide generation.
  • Analysis of existing data on influenza A virus protein processing.
  • Synthesis of current knowledge and identification of research gaps.

Main Results:

  • Influenza A virus DRiPs are a source of antigenic peptides for CD8+ T cell recognition.
  • The precise mechanisms of co-translational DRiP generation remain incompletely understood.
  • Significant variability exists in the characterization of DRiP-derived peptides.

Conclusions:

  • DRiPs play a crucial role in viral antigen presentation and T cell immunosurveillance.
  • Further research is needed to elucidate the co-translational generation pathways of viral DRiPs.
  • Understanding DRiP generation may offer new targets for antiviral therapies and vaccine development.