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Related Concept Videos

Microbiome of the Eye01:22

Microbiome of the Eye

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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...
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Microbiota of the Urogenital Tract01:28

Microbiota of the Urogenital Tract

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The human urogenital system, once thought to be sterile in healthy individuals, is now recognized as a complex microbial habitat. Advancements in molecular sequencing techniques have revealed that even in healthy adults, the kidneys and bladder harbor microbial populations similar to those found in the distal urethra, albeit in much lower abundance. These resident microorganisms, while generally innocuous, can become opportunistic pathogens under conditions that alter the urogenital...
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Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Microbiota of the Respiratory Tract01:29

Microbiota of the Respiratory Tract

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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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Microenvironments01:22

Microenvironments

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Microorganisms inhabit highly localized spaces known as microenvironments, which are defined by distinct physical and chemical characteristics. These include oxygen concentration, pH, temperature, light availability, and nutrient levels. The conditions within a microenvironment can differ markedly from those in the surrounding area and significantly influence microbial growth, metabolism, and community structure.Microenvironments often display sharp physicochemical gradients over small spatial...
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Microorganisms in Medicine and Therapeutics01:29

Microorganisms in Medicine and Therapeutics

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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Related Experiment Video

Updated: Apr 15, 2026

Primed Mycobacterial Uveitis PMU as a Model for Post-Infectious Uveitis
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Primed Mycobacterial Uveitis PMU as a Model for Post-Infectious Uveitis

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Environmental microbes and uveitis: is microbial exposure always bad?

C Massilamany1, A Gangaplara1,2, J Reddy1

  • 1School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE, USA.

Scandinavian Journal of Immunology
|April 3, 2015
PubMed
Summary

The eye

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Area of Science:

  • Ophthalmology
  • Immunology
  • Autoimmunity

Background:

  • The eye is traditionally viewed as immune-privileged, but this is challenged by ocular antigen expression in lymphoid organs, inducing self-tolerance.
  • A key question in autoimmunity is what breaks this self-tolerance, with environmental microbes often implicated in genetically susceptible individuals.

Purpose of the Study:

  • To review immune mechanisms in immune-mediated uveitis, focusing on the molecular mimicry hypothesis.
  • To discuss how microbial exposure might influence self-tolerance and ocular autoimmunity.

Main Methods:

  • Review of existing literature on ocular immunology and autoimmunity.
  • Analysis of the molecular mimicry hypothesis in the context of uveitis.

Main Results:

  • The molecular mimicry hypothesis suggests microbes can induce autoimmune responses via cross-reactive epitopes, potentially causing ocular damage.
  • Recent data indicate microbial products with mimicry epitopes for retinal antigens may be beneficial, challenging direct pathogenic roles.

Conclusions:

  • Immune-mediated uveitis involves complex interactions between self-tolerance, microbial exposure, and molecular mimicry.
  • The role of microbial mimicry in uveitis is nuanced, with potential for both detrimental and beneficial effects on ocular immunity.