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Sleep, microbes and cytokines
J M Krueger1, L A Toth, R Floyd
1Department of Physiology and Biophysics, University of Tennessee, Memphis 38163, USA.
Abstract:
Dynamic changes in sleep in response to infectious challenge are a facet of the acute phase response. Changes in sleep induced by infection seem to be of recuperative value to the host. Furthermore, loss of sleep is associated with changes in immune function. Specific components of microbes such as muramyl peptides or endotoxin from bacteria or double-stranded RNA from virus induce sleep responses. These microbial-induced responses are mediated via enhanced cytokine and hormone production. Interleukin-1, tumor necrosis factor and interferon-alpha are somnogenic. Interleukin-1-enhanced sleep involves growth hormone-releasing hormone. Microbial-cytokine-altered sleep results from an amplification of physiological sleep mechanisms.
Insights
Infections trigger dynamic sleep changes, aiding host recovery. Microbial components activate immune responses, influencing sleep through cytokines and hormones like Interleukin-1.
Area of Science:
- Immunology
- Sleep Science
- Microbiology
Background:
- Sleep alterations are part of the acute phase response during infection.
- Sleep deprivation negatively impacts immune function.
- Microbial components can directly induce sleep.
Purpose of the Study:
- To investigate the relationship between infection, sleep, and immune responses.
- To identify microbial factors that influence sleep.
- To understand the mechanisms mediating infection-induced sleep changes.
Main Methods:
- Review of literature on sleep, infection, and immune responses.
- Analysis of microbial components known to induce sleep.
- Examination of cytokine and hormone pathways involved in sleep regulation.
Main Results:
- Infections induce dynamic sleep changes beneficial for host recovery.
- Microbial molecules (muramyl peptides, endotoxin, dsRNA) promote sleep.
- Cytokines (Interleukin-1, TNF-alpha, IFN-alpha) and hormones mediate these sleep responses.
- Infection-induced sleep involves amplification of normal sleep mechanisms.
Conclusions:
- Sleep changes during infection are adaptive, supporting host defense.
- Microbial signals trigger immune mediators that enhance sleep.
- Understanding these pathways offers insights into host-pathogen interactions and therapeutic targets.