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Intravital Microscopy of the Spleen: Quantitative Analysis of Parasite Mobility and Blood Flow
Published on: January 14, 2012
Inflammation in the avian spleen: timing is everything
Kallur S Naidu1, Louis W Morgan, Michael J Bailey
1The Center for Biological Clocks Research, Department of Poultry Science, Texas A&M University, College Station, TX 77843-2472, USA.
BMC Molecular Biology
|January 4, 2011
Summary
The spleen exhibits daily rhythms in clock genes and inflammatory cytokines. Melatonin influences these rhythms, acting as both a pro- and anti-inflammatory agent, impacting immune function.
Area of Science:
- Immunology
- Chronobiology
- Molecular Biology
Background:
- Circadian rhythms, regulated by clock genes, are vital for organismal well-being.
- These rhythms are generated by intracellular molecular feedback loops.
- The spleen's immune function is influenced by the circadian clock.
Purpose of the Study:
- To investigate the daily control of circadian clock genes in the spleen.
- To examine the regulation of the inflammatory response by the spleen's circadian clock.
- To understand the role of melatonin in mediating spleen inflammation.
Main Methods:
- Analysis of daily oscillations in circadian clock gene and cytokine mRNA abundance.
- Assessment of LPS-induced systemic inflammation at different times of day (midday vs. midnight).
- Evaluation of melatonin's effects on inflammatory cytokines following LPS stimulation.
Main Results:
- Circadian clock genes and pro-inflammatory cytokines (Tnfα, IL-1β) show rhythmic mRNA oscillations over 24 hours.
- Spleen inflammation response to LPS differs significantly between midday and midnight, indicating a daily rhythm.
- Melatonin administration exhibits dual effects, both enhancing and repressing inflammatory cytokines, suggesting a complex role.
Conclusions:
- Daily rhythms in clock genes and inflammatory cytokines, modulated by melatonin, offer insights into circadian regulation of immune function.
- Further research is required to elucidate the exact molecular mechanisms of circadian clock and melatonin influence on peripheral immune functions.
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