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Factors Affecting the Risk of Infection01:26

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Enzyme-Linked Immunosorbent Assay

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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
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Selenium status and immunity.

Susan J Fairweather-Tait1, Tommaso Filippini2,3, Marco Vinceti2,4

  • 1Norwich Medical School, University of East Anglia, Norwich NR4 7TJ, UK.

The Proceedings of the Nutrition Society
|August 19, 2022
PubMed
Summary
This summary is machine-generated.

Selenium supplementation may influence immune function, particularly T and natural killer cells, but effects on humoral immunity are minimal. Further research on selenium

Keywords:
Immune functionInfectious diseasesSelenium

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Area of Science:

  • Biochemistry
  • Immunology
  • Human Nutrition

Background:

  • Selenium is a crucial component of selenoproteins, involved in antioxidant defense and immune system functions.
  • Existing data on selenium's impact on immune parameters is limited and often conflicting.
  • Optimal selenium intake for immune modulation remains uncertain.

Purpose of the Study:

  • To review the relationship between selenium and human immune function.
  • To focus on evidence from randomized controlled trials (RCTs) assessing selenium's effects on immunity.
  • To identify dose-dependent effects of selenium on specific immune cell types.

Main Methods:

  • Systematic literature search for RCTs on selenium and immune function.
  • Analysis of nine identified RCTs evaluating selenium administration (food or supplement).
  • Assessment of effects on cellular immunity (T cells, NK cells) and humoral immunity.

Main Results:

  • Some RCTs indicated dose- and form-dependent effects of selenium on T cells and natural killer (NK) cells.
  • Limited evidence suggests minimal impact of selenium on humoral immunity.
  • Overall, experimental studies in humans showed limited effects on general immune function.

Conclusions:

  • Quantitative dose-response analysis is needed for cellular immunity data to establish relationships between selenium intake and immune measures.
  • Further investigation into selenium status and its influence on cellular immunity is warranted.
  • Current evidence suggests a nuanced role for selenium in immune function, primarily impacting cellular components.