Related Experiment Videos
Immunomodulatory effects of melatonin in asthma
E Rand Sutherland1, Richard J Martin, Misoo C Ellison
1Department of Medicine, National Jewish Medical and Research Center, Denver, CO, USA. sutherlande@njc.org
American Journal of Respiratory and Critical Care Medicine
|October 16, 2002
Summary
Melatonin increases inflammation in asthma patients and healthy individuals. Nocturnal asthma patients show a larger daytime inflammatory response to melatonin, suggesting potential adverse effects from supplements.
Area of Science:
- Immunology
- Circadian Biology
- Respiratory Medicine
Background:
- Nocturnal asthma is linked to circadian variations in airway inflammation.
- Melatonin, a key circadian regulator, may influence these inflammatory patterns.
- Understanding melatonin's immunomodulatory role is crucial for asthma management.
Purpose of the Study:
- To investigate the effect of melatonin on cytokine production in peripheral blood mononuclear cells.
- To compare melatonin's impact across normal controls, nocturnal asthma, and non-nocturnal asthma patients.
- To determine if melatonin's proinflammatory effects vary based on time of day and asthma phenotype.
Main Methods:
- Peripheral blood mononuclear cells (PBMCs) from three subject groups were stimulated with melatonin.
- Cytokine production (Interleukin-1, Interleukin-6, Tumor Necrosis Factor-alpha) was measured at 4:00 P.M. and 4:00 A.M.
- Statistical analysis compared cytokine responses between groups and time points.
Main Results:
- Melatonin significantly increased pro-inflammatory cytokine production in all groups at both time points.
- Nocturnal asthma patients exhibited a greater cytokine response to melatonin at 4:00 P.M. compared to controls and non-nocturnal asthma patients.
- While non-nocturnal asthma patients showed increased cytokine response at 4:00 A.M., nocturnal asthma patients did not show further stimulation at this time.
- Control subjects and nocturnal asthma patients showed no significant change in cytokine response between 4:00 P.M. and 4:00 A.M.
Conclusions:
- Melatonin demonstrates pro-inflammatory effects in both healthy individuals and asthma patients.
- Patients with nocturnal asthma may experience chronic in vivo overstimulation, indicated by their inability to be further stimulated by melatonin at 4:00 A.M.
- The immunomodulatory effects of melatonin differ based on asthma phenotype, suggesting potential adverse effects of exogenous melatonin in asthma management.