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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A Mouse Model of Vascularized Heterotopic Spleen Transplantation for Studying Spleen Cell Biology and Transplant Immunity
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Immune challenges decrease biliverdin concentration in the spleen of northern Bobwhite quail, Colinus virginianus.

Melissa P Homsher1,2, Michael T Astor3, Justin K Hines3

  • 1Department of Biology, Lafayette College, Easton, PA, 18042, USA.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|January 31, 2018
PubMed
Summary

Biliverdin, an antioxidant, was studied for immune-modulating effects in quail. Results indicate biliverdin does not suppress immune function and may be reduced during immune challenges, suggesting complex physiological roles.

Keywords:
AntioxidantBiliverdinHemagglutinationHeme oxygenaseHemolysisHumoral response

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Area of Science:

  • Biochemistry
  • Immunology
  • Avian Physiology

Background:

  • Antioxidants possess dual functions, including immune modulation beyond oxidative damage control.
  • Biliverdin, a heme breakdown product, exhibits potential antioxidant and immune-suppressing properties, though its physiological roles are understudied.
  • In vivo studies are limited due to rapid biliverdin conversion to bilirubin in mammals.

Purpose of the Study:

  • To investigate the immunomodulating roles of biliverdin in a non-mammalian model.
  • To assess the effect of biliverdin on immune responses, specifically hemagglutination and hemolysis.
  • To examine biliverdin concentration in response to immune challenge.

Main Methods:

  • Northern Bobwhite quail were injected with vehicle control, heme-removed pig red blood cells (pRBC), or intact pRBC.
  • Hemagglutination and hemolysis were quantified post-injection.
  • Biliverdin concentrations in the liver and spleen were measured at 3, 6, and 9 days.

Main Results:

  • Hemagglutination was significantly higher in quail receiving intact pRBC compared to those receiving heme-removed pRBC.
  • Biliverdin levels in the liver and spleen were positively correlated within individuals.
  • A reduced spleen biliverdin concentration was observed in quail injected with intact pRBC.

Conclusions:

  • Biliverdin does not appear to suppress immune function at the tested dosage in quail.
  • Immune challenges may lead to decreased biliverdin production or accumulation.
  • Further research is warranted to elucidate the complex physiological functions of biliverdin.