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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
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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.

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.

Related Experiment Videos

  • 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.