Ultra-fast magnetic resonance encephalography of physiological brain activity – Glymphatic pulsation mechanisms? DOI Open Access
Vesa Kiviniemi, Xindi Wang, Vesa Korhonen

et al.

Journal of Cerebral Blood Flow & Metabolism, Journal Year: 2015, Volume and Issue: 36(6), P. 1033 - 1045

Published: Dec. 21, 2015

The theory on the glymphatic convection mechanism of cerebrospinal fluid holds that cardiac pulsations in part pump from peri-arterial spaces through extracellular tissue into peri-venous facilitated by aquaporin water channels. Since pulses cannot be sole propulsion, we searched for additional human brain with ultra-fast magnetic resonance encephalography. We detected three types physiological mechanisms affecting cerebral pulsations: cardiac, respiratory, and very low frequency pulsations. induce a negative encephalography signal change regions extends centrifugally covers ≈1 Hz cycles. respiratory ≈0.3 are centripetal periodical occur dominantly areas. third type pulsation was (VLF 0.001–0.023 Hz) (LF 0.023–0.73 waves both propagate unique spatiotemporal patterns. Our findings using critically sampled open new view dynamics. system failure may precede protein accumulations diseases such as Alzheimer's dementia, this methodological advance offers novel approach to image dynamics potentially can enable early detection intervention neurodegenerative diseases.

Language: Английский

Sleep Drives Metabolite Clearance from the Adult Brain DOI
Lulu Xie,

Hongyi Kang,

Qiwu Xu

et al.

Science, Journal Year: 2013, Volume and Issue: 342(6156), P. 373 - 377

Published: Oct. 17, 2013

Taking Out the Trash The purpose of sleep remains mysterious. Using state-of-the-art in vivo two-photon imaging to directly compare two arousal states same mouse, Xie et al. (p. 373 ; see Perspective by Herculano-Houzel ) found that metabolic waste products neural activity were cleared out sleeping brain at a faster rate than during awake state. This finding suggests mechanistic explanation for how serves restorative function, addition its well-described effects on memory consolidation.

Language: Английский

Citations

4386

The Neurovascular Unit Coming of Age: A Journey through Neurovascular Coupling in Health and Disease DOI Creative Commons
Costantino Iadecola

Neuron, Journal Year: 2017, Volume and Issue: 96(1), P. 17 - 42

Published: Sept. 1, 2017

Language: Английский

Citations

1898

Clearance systems in the brain—implications for Alzheimer disease DOI

Jenna M. Tarasoff-Conway,

Roxana O. Carare, Ricardo S. Osorio

et al.

Nature Reviews Neurology, Journal Year: 2015, Volume and Issue: 11(8), P. 457 - 470

Published: July 21, 2015

Language: Английский

Citations

1396

Physiology of Astroglia DOI Open Access
Alexei Verkhratsky, Maiken Nedergaard

Physiological Reviews, Journal Year: 2017, Volume and Issue: 98(1), P. 239 - 389

Published: Dec. 24, 2017

Astrocytes are neural cells of ectodermal, neuroepithelial origin that provide for homeostasis and defense the central nervous system (CNS). highly heterogeneous in morphological appearance; they express a multitude receptors, channels, membrane transporters. This complement underlies their remarkable adaptive plasticity defines functional maintenance CNS development aging. tightly integrated into networks act within context tissue; astrocytes control at all levels organization from molecular to whole organ.

Language: Английский

Citations

1334

Glutamate as a neurotransmitter in the healthy brain DOI Creative Commons
Yun Zhou, Niels C. Danbolt

Journal of Neural Transmission, Journal Year: 2014, Volume and Issue: 121(8), P. 799 - 817

Published: Feb. 28, 2014

Glutamate is the most abundant free amino acid in brain and at crossroad between multiple metabolic pathways. Considering this, it was a surprise to discover that glutamate has excitatory effects on nerve cells, can excite cells their death process now referred as "excitotoxicity". This effect due receptors present surface of cells. Powerful uptake systems (glutamate transporters) prevent excessive activation these by continuously removing from extracellular fluid brain. Further, blood–brain barrier shields blood. The highest concentrations are found synaptic vesicles terminals where be released exocytosis. In fact, major neurotransmitter mammalian central nervous system. It took, however, long time realize that. review provides brief historical description, gives short overview transmitter healthy brain, comments so-called glutamate–glutamine cycle. transporters responsible for removal described some detail.

Language: Английский

Citations

821

A new look at cerebrospinal fluid circulation DOI Creative Commons

Thomas Brinker,

Edward G. Stopa,

John F. Morrison

et al.

Fluids and Barriers of the CNS, Journal Year: 2014, Volume and Issue: 11(1), P. 10 - 10

Published: Jan. 1, 2014

According to the traditional understanding of cerebrospinal fluid (CSF) physiology, majority CSF is produced by choroid plexus, circulates through ventricles, cisterns, and subarachnoid space be absorbed into blood arachnoid villi. This review surveys key developments leading concept. Challenging this concept are novel insights utilizing molecular cellular biology as well neuroimaging, which indicate that physiology may much more complex than previously believed. The circulation comprises not only a directed flow CSF, but in addition pulsatile fro movement throughout entire brain with local exchange between blood, interstitial fluid, CSF. Astrocytes, aquaporins, other membrane transporters elements water homeostasis. A continuous bidirectional at barrier produces rates, exceed choroidal production rate far. around vessels penetrating from Virchow Robin spaces provides both drainage pathway for clearance waste molecules site interaction systemic immune system brain. Important physiological functions, example regeneration during sleep, depend on circulation.

Language: Английский

Citations

732

β-Amyloid accumulation in the human brain after one night of sleep deprivation DOI Creative Commons
Ehsan Shokri‐Kojori, Gene‐Jack Wang, Corinde E. Wiers

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2018, Volume and Issue: 115(17), P. 4483 - 4488

Published: April 9, 2018

Significance There has been an emerging interest in sleep and its association with β-amyloid burden as a risk factor for Alzheimer’s disease. Despite the evidence that acute deprivation elevates levels mouse interstitial fluid human cerebrospinal fluid, not much is known about impact of on brain. Using positron emission tomography, here we show impacts brain regions have implicated Our observations provide preliminary negative effect

Language: Английский

Citations

709

Astrocyte roles in traumatic brain injury DOI
Joshua E. Burda,

Alexander M. Bernstein,

Michael V. Sofroniew

et al.

Experimental Neurology, Journal Year: 2015, Volume and Issue: 275, P. 305 - 315

Published: April 5, 2015

Language: Английский

Citations

683

Glymphatic failure as a final common pathway to dementia DOI

Maiken Nedergaard,

Steven A. Goldman

Science, Journal Year: 2020, Volume and Issue: 370(6512), P. 50 - 56

Published: Oct. 2, 2020

Sleep is evolutionarily conserved across all species, and impaired sleep a common trait of the diseased brain. quality decreases as we age, disruption regular architecture frequent antecedent to onset dementia in neurodegenerative diseases. The glymphatic system, which clears brain protein waste products, mostly active during sleep. Yet system degrades with suggesting causal relationship between disturbance symptomatic progression dementias. ties that bind sleep, aging, clearance, aggregation have shed new light on pathogenesis broad range diseases, for failure may constitute therapeutically targetable final pathway.

Language: Английский

Citations

677

Cerebral amyloid angiopathy and Alzheimer disease — one peptide, two pathways DOI
Steven M. Greenberg, Brian J. Bacskai, Mar Hernández‐Guillamón

et al.

Nature Reviews Neurology, Journal Year: 2019, Volume and Issue: 16(1), P. 30 - 42

Published: Dec. 11, 2019

Language: Английский

Citations

643