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Related Experiment Videos

Altered alveolar macrophage function in calorie-restricted rats

W Dong1, M K Selgrade, I M Gilmour

  • 1Immunotoxicology Branch, United States Environmental Protection Agency, Research Triangle Park; Center for Environmental Medicine and Lung Biology, University of North Carolina, Chapel Hill, USA.

American Journal of Respiratory Cell and Molecular Biology
|September 9, 1998
PubMed
Summary

Caloric restriction enhances lung macrophage bacterial clearance and ozone resistance in rats. This dietary change improves immune function but may reduce inflammatory responses to certain bacterial components.

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Area of Science:

  • Immunology
  • Respiratory Medicine
  • Nutritional Science

Background:

  • Alveolar macrophages are crucial for lung bacterial clearance.
  • Ozone exposure impairs macrophage phagocytic function.
  • Caloric restriction's effects on immune defense are not fully understood.

Purpose of the Study:

  • To investigate the impact of caloric restriction on alveolar macrophage function.
  • To assess the protective effects of caloric restriction against ozone-induced lung injury.
  • To evaluate the influence of caloric restriction on bacterial infection outcomes.

Main Methods:

  • Male Fischer 344 rats were subjected to 25% caloric restriction or fed ad libitum.
  • Rats were exposed to ozone, followed by challenges with latex beads or Streptococcus zooepidemicus.

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  • Alveolar macrophage function, including phagocytosis and mediator production (nitric oxide, TNF-alpha, IL-6), was assessed.

    • Main Results:

    • Caloric restriction enhanced alveolar macrophage phagocytosis, even after ozone exposure.
    • Calorie-restricted rats cleared Streptococcus zooepidemicus within 24 hours post-ozone exposure without inflammation.
    • Macrophages from calorie-restricted rats showed lower endotoxin-stimulated nitric oxide and TNF-alpha production.

    Conclusions:

    • Caloric restriction improves resistance to Gram-positive bacteria and lung defense against ozone.
    • Dietary intervention reduces pro-inflammatory mediator production by macrophages.
    • Reduced inflammation may have both beneficial and detrimental consequences for lung health.