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Neurobiological studies of fatigue
Open accessAbstract
Fatigue is a symptom associated with many disorders, is especially common in women and in older adults, and can have a huge negative influence on quality of life. Although most past research on fatigue uses human subjects instead of animal models, the use of appropriate animal models has recently begun to advance our understanding of the neurobiology of fatigue. In this review, results from animal models using immunological, developmental, or physical approaches to study fatigue are described and compared. Common across these animal models is that fatigue arises when a stimulus induces activation of microglia and/or increased cytokines and chemokines in the brain. Neurobiological studies implicate structures in the ascending arousal system, sleep executive control areas, and areas important in reward. In addition, the suprachiasmatic nucleus clearly plays an important role in homeostatic regulation of the neural network mediating fatigue. This nucleus responds to cytokines, shows decreased amplitude firing rate output in models of fatigue, and responds to exercise, one of our few treatments for fatigue. This is a young field but very important as the symptom of fatigue is common across many disorders and we do not have effective treatments.
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BackgroundDysregulation of cellular energetics in Gulf War Illness
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“DSM symptoms linked to these NCRS include: psychomotor retardation [shown to be regulated mostly by dopaminergic systems (25), modulated by mu-opioid and deltaopioid receptor systems], fatigue [linked to serotonin systems (26) which are linked to depression (29–31) and to endurance (26, 31)], impulsivity [linked to in…”
BackgroundThe relationship between fatigue, sleep quality, and sleep deprivation
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“In light of these interconnections, it is essential to distinguish between fatigue and DTS, as their treatment options are specific to each condition [11, 12].”
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“Neuroimaging studies in patients with disease-related fatigue have shown atrophy or other damage in the striatum and cortex (Harrington, 2012).”
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Exploring cariprazine as a treatment option for varied depression symptom clusters
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“”[19]Most clinical assessments of fatigue are based on self-report scales of which there are over 250 for fatigue.[20] These scales vary considerably in terms of the construct of fatigue (e.”
Backgroundde Aquino, G. Â., de Sousa, C. N. S., Medeiros, I. D. S., de Almeida, J. C., Filho, F. M. S. C., Júnior, M. A. S., & Vasconcelos, S. M. M. (2021) · Journal of Basic and Clinical Physiology and Pharmacology · doi:10.1515/jbcpp-2021-0056 · Cited by 7
Venincasa, M. J., Randlett, O., Sumathipala, S. H., Bindernagel, R. G., Stark, M. J., Yan, Q., Sloan, S. A., Buglo, E., Meng, Q. C., Engert, F., et al. (2021) · Scientific Reports · doi:10.1038/s41598-021-82342-w · Cited by 6
Faingold, C. L. (2014) · Elsevier eBooks · doi:10.1016/b978-0-12-415804-7.00007-1 · Cited by 7
Cotter, C., Tapp, Z. M., Ren, C., Houle, S., Mitsch, J., Sheridan, J. F., Godbout, J. P., Peng, J., Ingiosi, A. M., & Kokiko‐Cochran, O. N. (2025) · Experimental Neurology · doi:10.1016/j.expneurol.2025.115544 · Cited by 6
“An unmotivated decrease in cage activity with no change in wakefulness further reflects key aspects of fatigue (Harrington, 2012).”
Smith (2013) · American Journal of Immunology · doi:10.3844/ajisp.2013.120.129 · Cited by 6
“3 were obtained in serum-free medium, thus ruling out the effects of possible confounding factors present in serum (Inui et al., 2013).”
BackgroundEffects of dopamine uptake inhibitor MRZ-9547 in animal models of Parkinson’s disease
Dekundy, A., Mela, F., Hofmann, M. C. J., & Danysz, W. (2014) · Journal of Neural Transmission · doi:10.1007/s00702-014-1326-8 · Cited by 6
“Currently there are no accepted animal models of PDrelated fatigue available (Harrington 2012).”
BackgroundInfluentialMoriya, J., He, Q., Uenishi, H., Akazawa, S., Yamakawa, J.-I., Kobayashi, J., & Ishigaki, Y. (2015) · BioMed Research International · doi:10.1155/2015/191489 · Cited by 5
“Most studies used the immunologically induced fatigue [8].”
BackgroundTransforming fatigue assessment: Smartphone-based system with digitized motor skill tests
Valla, E., Toose, A.-J., Nõmm, S., & Toomela, A. (2023) · International Journal of Medical Informatics · doi:10.1016/j.ijmedinf.2023.105152 · Cited by 6
Chronic Fatigue Syndrome (CFS) or “Systemic Immune Disorder” (SID)?
Comhaire, F. H., & Devriendt, G. (2016) · Internal Medicine Open Access · doi:10.4172/2165-8048.1000225 · Cited by 5
“Neuro-inflammation [65] and oxidative overload severely disturb cerebral function [66].”
BackgroundLi, H., Rong, S.-S., Hong, X., Guo, R., Yang, F., Liang, Y., Li, A., & So, K. (2019) · Restorative Neurology and Neuroscience · doi:10.3233/rnn-190945 · Cited by 5
“The activation of microglia is associated with mis-cellaneous CNS disorders, including CNS-derived fatigue (Harrington, 2012), AD (Lu et al., 2017a), PD (Joers, Tansey, Mulas, & Carta, 2017) and multiple sclerosis (Xu, He, & Bai, 2016).”
Hengenius, J. B., Ehrenkranz, R. C., Zhu, X., Glynn, N. W., Huppert, T. J., & Rosano, C. (2024) · Experimental Gerontology · doi:10.1016/j.exger.2024.112388 · Cited by 4
“However, this evidence is mostly in animal models (Harrington, 2012), young adults (Marcora, 2016), or neurological patients (Chaudhuri and Behan, 2000; Kluger et al., 2016; Barbi et al., 2022).”
Chen, S.-Y., Chen, C., Lo, C., Lu, M., Hsu, C.-D., Chiu, Y.-H., Chen, C.-H., Lin, S., Huang, M., Chen, H., et al. (2021) · Nature and Science of Sleep · doi:10.2147/nss.s301357 · Cited by 4
Opiate Action on Sleep and Breathing
Lydic, R., Keifer, J. C., Baghdoyan, H. A., Craft, R. M., & Angel, C. (2016) · Elsevier eBooks · doi:10.1016/b978-0-323-24288-2.00024-6 · Cited by 4
Tapp, Z. M., Seng, M. M., Ghosh, A. K., Obrietan, K. H., & Pyter, L. M. (2025) · eNeuro · doi:10.1523/eneuro.0061-25.2025 · Cited by 3
“Alternatively, chemotherapy and circadian challenges may be contradictory drivers of fatigue, differentially affecting elements of fatigue behavior such as motivation, muscle exhaustion, or sleep disturbances (Harrington, 2012).”
Neural and computational mechanisms of effort under the pressure of a deadline
Pisauro, M. A., Pollicino, D., Fisher, L., & Apps, M. A. J. (2026) · Nature Communications · doi:10.1038/s41467-026-75987-6 · Cited by 3
“However,whilethereis evidence thatanimals can change theirpreferences for how willing they are to exert effort over time 2,23 – 25 , and people self-report liking more the result of effortful behaviours 22,26 , there is little empirical study of how people make decisions to exert effort when it…”
A novel mutation in Slc2a4 as a mouse model of fatigue
de Groot, M. H. M., Castorena, C. M., Cox, K. H., Kumar, V., Mohawk, J. A., Ahmed, N. I., & Takahashi, J. S. (2019) · Genes Brain & Behavior · doi:10.1111/gbb.12578 · Cited by 2
“The mouse is an ideal model organism to investigate physiological and neurological pathways involved in fatigue.(10,11) Currently, there Received: 18 March 2019 Revised: 1 May 2019 Accepted: 2 May 2019”
BackgroundInfluentialMental fatigue and cognitive functioning in patients presenting with non-enhancing gliomas
Neimantaite, A., Vecchio, T. G., Rydén, I., Harba, D., Jakola, A. S., & Smits, A. (2025) · Acta Neurochirurgica · doi:10.1007/s00701-025-06434-6 · Cited by 2
“Fatigue is a broadly used term including physical, mental and other aspects [14, 18].”
Xu, S., Fu, C., Li, Q. L., & Xu, K. (2025) · IEEE Transactions on Networking · doi:10.1109/ton.2025.3546735 · Cited by 2
“Particularly, existing studies demonstrate that the fatigue status of human brain, which leads to poor decisions, reflects on chemical status of brain neuron cells [32], [56].”
Stoynev, A. G., Ikonomov, O. C., & Stoynev, N. (2021) · Biological Rhythm Research · doi:10.1080/09291016.2021.1920125 · Cited by 3
Chaudhary, R., & Singh, R. (2023) · CNS & Neurological Disorders - Drug Targets · doi:10.2174/1871527322666230518111323 · Cited by 2
Shared Microglial Mechanisms Underpinning Depression and Fatigue and Their ComorbiditiesPreprint
Filho, A. J. M. C., Macêdo, D. S., de Lucena, D. F., & Maes, M. H. J. (2019) · Preprints.org · doi:10.20944/preprints201902.0029.v1 · Cited by 1
“Recent results obtained from animal models of fatigue revealed that this condition is associated with activated microglia and brain release of cytokines and chemokines [23].”
Epileptic seizure clustering and accumulation at transition from activity to rest in GAERS rats
Tran, H., Mahzoum, R. E., Bonnot, A., & Cohen, I. (2024) · Frontiers in Neurology · doi:10.3389/fneur.2023.1296421 · Cited by 1
“Such pathways of central fatigue include complex multifactorial mechanisms based on monoamines and cytokines (37), which play a key role in wake/sleep switching and global metabolic homeostasis.”
BackgroundBatheja, S., Yang, J., Liao, Y., Wengler, K., He, X., Ali, F., Rozensky, R., & DeLorenzo, C. (2026) · Journal of Affective Disorders · doi:10.1016/j.jad.2025.121076 · Cited by 1
“…fatigue, a feeling of low energy, diminished focus, and tiredness, requiring rest but not necessarily sleep (Shen et al., 2006), is also one of the most common symptoms of depression experienced by 73–97 % of depressed patients (Ferentinos et al., 2009; Harrington, 2012; Tylee et al., 1999).”
Wang, K., Lü, J., Xiang, Z., Shi, M., Wu, L., Yan, F., & Jiang, R. (2024) · Advanced Physics Research · doi:10.1002/apxr.202400047 · Cited by 1
Jiang, B., Zheng, S., An, L., Guo, J., & Asakawa, T. (2019) · Journal of Berry Research · doi:10.3233/jbr-180350 · Cited by 1
“Reportedly, fatigue is a self-protective inhibition that aims to prevent defatigation [1], and it is associated with the limbic input in the basal ganglia related to dopaminergic neurons [2].”
Basal kroppskännedom och psykomotorisk funktion hos personer med allvarlig psykisk sjukdom
Hedlund, L. (2014) · Lund University Publications (Lund University) · Cited by 1
Broken Connections: The Evidence for Neuroglial Failure in ME/CFSPreprint
Renz‐Polster, H. (2021) · OSF Preprints (OSF Preprints) · doi:10.31219/osf.io/ef3n4 · Cited by 1
Dailey, D. L. (2013) · doi:10.17077/etd.qkvfhaca
“fatigue, and in parallel increase expression of pro-inflammatory cytokines [53,93].”
BackgroundCircadian Regulation of Arousal and its Role in Fatigue
Bonsall, D. R., & Harrington, M. E. (2015) · Wiley eBooks · doi:10.1002/9781118467831.ch5
Self-citationKaruka, A. H. (2014) · Americanae (AECID Library)
Mialovytska, O. A., & Khyzhniak, Y. (2017) · EUREKA Health Sciences · doi:10.21303/2504-5679.2017.00273
“Fatigue is characterized by a lack of energy, feelings of exhaustion that are unaided by sleep, and the perception that one is unable to perform mental and physical activities [9].”
Backgroundde Groot, M. H. M., Castorena, C. M., Kumar, V., Mohawk, J. A., Ahmed, N. I., & Takahashi, J. S. (2017) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/163378
“51 The mouse is an ideal model organism to investigate physiological and 52 neurological pathways involved in fatigue (9, 17).”
BackgroundMethodInfluential
Metadata
- Authors
- Harrington, M. E.
- Affiliations
- Smith College (US)
- Corresponding author
- Harrington, Mary E.
- ORCID
- Harrington, Mary E.
- Venue
- Progress in Neurobiology
- Publisher
- Elsevier BV
- Published
- 2012-11
- Volume
- 99
- Issue
- 2
- Pages
- 93-105
- ISSN
- 0301-0082 (ISSN-L)
- PMC
- PMC3479364
- OpenAlex
- W2038548714
- Cited by
- 112
- References
- 168
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 10 · 2023: 6 · 2022: 5 · 2021: 11 · 2020: 6 · 2019: 7 · 2018: 11 · 2017: 8 · 2016: 10 · 2015: 12 · 2014: 11 · 2013: 4
- FWCI
- 1.16
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- Progress in Neurobiology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Smith ScholarWorks (Smith College) (submittedVersion)
- Funders
- National Institutes of Health
- National Cancer Institute (R21CA125215)
- National Institute of Nursing Research (R21NR012845)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Fibromyalgia and Chronic Fatigue Syndrome Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- fatigue, microglial activation, cytokines, chemokines, ascending arousal system, reward, suprachiasmatic nucleus, homeostatic regulation, physical activity, quality of life
- MeSH terms
- Animals, Brain, Disease Models, Animal, Fatigue, Humans, Neurobiology, Fatigue Syndrome, Chronic, Autoimmune Diseases of the Nervous System
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