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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Human Virome01:26

Human Virome

The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible only with...
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...

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Related Experiment Video

Updated: Jun 23, 2026

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds
07:13

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds

Published on: August 8, 2025

Resveratrol-Derived Dimers With Antimicrobial and Immune-Enhancing Activities.

Peter Riber Johnsen1, Cecilia Pinna2, Luca Andersen1

  • 1Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark.

Biofactors (Oxford, England)
|June 21, 2026
PubMed
Summary

Dehydro-δ-viniferin shows potent antimicrobial activity against methicillin-resistant Staphylococcus aureus. This polyphenol also enhances immune cell response, suggesting its potential as a novel antibiotic candidate for multidrug-resistant bacteria.

Keywords:
IL‐12 enhancing activityMRSAantibiotic activitybone marrow derived dendritic cellsdehydro‐δ‐viniferinresveratrol derivates

Related Experiment Videos

Last Updated: Jun 23, 2026

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds
07:13

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds

Published on: August 8, 2025

Area of Science:

  • Natural Products Chemistry
  • Immunology
  • Microbiology

Background:

  • Polyphenols are a promising, largely unexploited source for novel antibiotic discovery.
  • Some polyphenols possess immunomodulatory properties that can aid in pathogen clearance.

Purpose of the Study:

  • To investigate the antimicrobial and immunomodulatory effects of four resveratrol-derived dimeric compounds against methicillin-resistant Staphylococcus aureus (MRSA).
  • To assess the potential of these compounds as candidates for new antibiotic therapies.

Main Methods:

  • Screening of four resveratrol derivatives (dehydro-δ-viniferin, (±)-trans-δ-viniferin, viniferifuran, (±)-ε-viniferin) for antimicrobial activity against MRSA.
  • Evaluation of immunomodulatory properties using bacterially challenged bone marrow-derived dendritic cells, measuring cytokine production (IL-12, IL-10).

Main Results:

  • Dehydro-δ-viniferin demonstrated the most potent antimicrobial activity against MRSA, with a minimal inhibitory concentration (MIC) of 2 μg/mL and a minimal bactericidal concentration (MBC) of 8 μg/mL.
  • Dehydro-δ-viniferin significantly enhanced MRSA-induced IL-12 production by dendritic cells, correlated with a decrease in IL-10 production.
  • The timing of dehydro-δ-viniferin administration was crucial; pre-treatment enhanced IL-12, while later addition reduced IL-10 but lost the IL-12 enhancement, indicating time-dependent pathway interference.

Conclusions:

  • Dehydro-δ-viniferin is a potent antimicrobial agent effective against MRSA.
  • Dehydro-δ-viniferin modulates the immune response by enhancing IL-12 production and potentially inhibiting IL-10 in antigen-presenting cells.
  • Dehydro-δ-viniferin is a promising candidate for developing new treatments against multidrug-resistant Gram-positive bacteria.