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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...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
Microbiome of the Eye01:22

Microbiome of the Eye

The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...
Chemical Agents for Microbial Control01:27

Chemical Agents for Microbial Control

Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
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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Optimizing Tear Collection in Mice for mRNA and Protein Analysis
09:04

Optimizing Tear Collection in Mice for mRNA and Protein Analysis

Published on: July 19, 2024

Antimicrobial compounds in tears.

Alison M McDermott1

  • 1University of Houston, College of Optometry, 4901 Calhoun Road, 505 J Davis Armistead Bldg, Houston, TX 77204-2020, USA.

Experimental Eye Research
|July 25, 2013
PubMed
Summary
This summary is machine-generated.

Tears contain numerous antimicrobial molecules that protect the eye. Their cooperative action is crucial for ocular surface defense, especially in conditions like dry eye disease.

Keywords:
antimicrobialcontact lensdry eyetears

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Area of Science:

  • Ophthalmology
  • Immunology
  • Microbiology

Background:

  • The tear film is essential for ocular surface health and defense.
  • It contains various antimicrobial components protecting against pathogens.

Purpose of the Study:

  • To review antimicrobial molecules present in human tears.
  • To discuss their potential roles in innate ocular immunity.
  • To explore how conditions like dry eye disease impact tear immunity.

Main Methods:

  • Literature review of antimicrobial compounds in tears.
  • Analysis of known and potential antimicrobial molecules.
  • Discussion of synergistic interactions and in vivo activity.

Main Results:

  • Tears contain classic antimicrobials (e.g., lysozyme) and newer ones (e.g., cationic antimicrobial peptides, surfactant protein-D).
  • Synergistic interactions among tear antimicrobials are likely key to their protective function.
  • Some tear components inhibit pathogen invasion and enhance epithelial defense.

Conclusions:

  • Tears possess a complex antimicrobial system vital for ocular surface protection.
  • Disruptions in tear composition or function, such as in dry eye disease, can compromise ocular immunity.