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Related Concept Videos

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...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Immunological Memory01:23

Immunological Memory

Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: May 19, 2026

A Non-invasive Way to Isolate and Phenotype Cells from the Conjunctiva
07:35

A Non-invasive Way to Isolate and Phenotype Cells from the Conjunctiva

Published on: July 5, 2017

Light and ocular immunity.

Amir Reza Hajrasouliha1, Henry J Kaplan

  • 1Department of Ophthalmology and Visual Sciences, Kentucky Lions Eye Center, University of Louisville, Louisville, Kentucky, USA.

Current Opinion in Allergy and Clinical Immunology
|August 16, 2012
PubMed
Summary

Light exposure, including artificial light at night and increased UV radiation, significantly impacts the systemic immune response. Understanding this interaction is crucial for developing new health strategies and disease prevention methods.

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Area of Science:

  • Immunology
  • Environmental Health
  • Ophthalmology

Background:

  • Human evolution has been marked by a recent increase in exposure to artificial light at night and elevated ultraviolet (UV) radiation.
  • These environmental shifts alter the natural light-dark cycle, potentially impacting the human immune system.
  • The systemic immune response is increasingly recognized as sensitive to light exposure, with implications for overall health.

Purpose of the Study:

  • To review the multifaceted effects of light exposure on the systemic immune response.
  • To specifically examine the role of light in ocular immunity.
  • To explore how ecological changes in light exposure influence immune function.

Main Methods:

  • Literature review of current scientific evidence on light exposure and immune response.
  • Analysis of studies focusing on visible light's role in ocular immune privilege.
  • Examination of mechanisms linking light to regulatory T cell generation and retinoic acid formation.

Main Results:

  • Visible light is essential for maintaining immune privilege within the eye.
  • Regulatory T cell generation in the eye is linked to retinoic acid production by retinal pigment epithelial cells.
  • Light influences circadian rhythms and vitamin D production, affecting systemic immunity.

Conclusions:

  • Light profoundly regulates biological systems, influencing both health maintenance and disease induction.
  • Understanding the light-immune system interaction offers potential for novel preventive and therapeutic strategies.
  • Further research into light's biological effects may unlock new approaches to disease management.