Dr. Paul Chazot, a researcher at Durham University in the U.K., has spent many years developing a particular wavelength of infrared light for use in dementia therapy. Transcranial PBM, sometimes accompanied by intranasal PBM, has been tested to improve many brain disorders, including dementia. PBM has been shown to modulate levels of both pro and anti- inflammatory cytokines, though for the reduction of inflammation, its ability to modulate levels of tumor necrosis factor (TNF) and other pro-inflammatory cytokines is especially useful. Vascular dysfunctionThe disregarded partner of Alzheimers disease, Microvascular pathology in the aging human brain: Evidence that senile plaques are sites of microhaemorrhages. Worldwide, Alzheimer disease (AD) incidence increases faster than any other age-related dementia. J. Photochem, Walski T; Drohomirecka A; Bujok J; Czerski A; W G; Trochanowska-Pauk N; Gorczykowski M; Cichon R; Komorowska M, Low-Level Light Therapy Protects Red Blood Cells Against Oxidative Stress and Hemolysis during Extracorporeal Circulation, Sarandol A; Sarandol E; Eker SS; Erdinc S; Vatansever E; Kirli S, Major depressive disorder is accompanied with oxidative stress: Short-term antidepressant treatment does not alter oxidativeantioxidative systems, Wadsworth TL; Bishop JA; Pappu AS; Woltjer RL; Quinn JF, Evaluation of Coenzyme Q as an Antioxidant Strategy for Alzheimers Disease, Lim W; Kim J; Kim S; Karna S; Won J; Jeon SM; Kim SY; Choi Y; Choi H; Kim O, Modulation of lipopolysaccharide-induced NF-kappaB signaling pathway by 635 nm irradiation via heat shock protein 27 in human gingival fibroblast cells, Celecoxib Alleviates Memory Deficits by Downregulation of COX-2 Expression and Upregulation of the BDNF-TrkB Signaling Pathway in a Diabetic Rat Model. If tPBM possesses the ability to counter these effects by facilitating neural organization or reorganization, it could prove to be extremely promising as a novel method of treating such brain disorders. Roomruangwong C; Anderson G; Berk M; Stoyanov D; Carvalho AF; Maes M, A neuroimmune, neuro-oxidative and neuro-nitrosative model of prenatal and postpartum depression, Prog. On the other hand if the IWL were localized within the plasma membrane, light absorption could increase the uptake of nutrients accounting for increased proliferation. PBM has also been shown to be effective in protecting cells from the harmful effects of toxins [74]. In AD brains, 3R and 4R tau is accumulated in a hyperphosphorylated state that forms neurofibrillary tangles (NFTs) in cell bodies, or threads if they are formed in dendrites or axons. There is emerging evidence that other primary chromophores such as opsins, flavins and cryptochomes, may mediate the biological absorption of light, particularly at shorter wavelengths (blue and green). Figure 3 shows a selection of devices that have been used for tPBM. This, in turn, causes reduced expression of the p21 protein and mitotic arrest in the G1 phase, therefore slowing the overall progression of cellular senescence. There are a large number of mechanisms for tPBM in the brain that have been proposed (discussed below). Bloodbrain barrier breakdown is an early biomarker of human cognitive dysfunction, Oxidative stress hypothesis in Alzheimers disease: A reappraisal. Oakley H; Cole SL; Logan S; Maus E; Shao P; Craft J; Guillozet-Bongaarts A; Ohno M; Disterhoft J; Van Eldik L; et al. A variety of antioxidants (and in particular coenzyme Q10) have been tested for treatment of AD [97]. However, when GSK3 is inhibited, AKT the communication pathway between AKT and Bax is cut off. Some helmets and hoods are designed to deliver light covering the entire head. Chen AC-H; Arany PR; Huang Y-Y; Tomkinson EM; Sharma SK; Kharkwal GB; Saleem T; Mooney D; Yull FE; Blackwell TS; et al. Immunohistochemical analysis of brain slices showed the PBM-treated mice had a 68% reduction in amyloid plaque burden. [149] who treated a case series of five patients diagnosed with mild to moderately severe dementia (Mini-Mental State Exam, MMSE, scores of 1024). Scientific society has proposed some non-pharmacological interventions . Iaccarino HF; Singer AC; Martorell AJ; Rudenko A; Gao F; Gillingham TZ; Mathys H; Seo J; Kritskiy O; Abdurrob F; et al. Accumulating evidence suggests that that microglia with the M1 phenotype are important players in AD [44]. Cytochrome C oxidase (CCO) is the terminal enzyme (unit IV) in the electron transport chain situated in the outer mitochondrial membrane. The precise mechanisms of AD remain a subject of hot debate [39]. [151] carried out a small pilot double blind, placebo-controlled trial in subjects diagnosed with dementia (n = 11, including six active, three controls and two dropouts) to assess the effect of 28 consecutive, six-minute transcranial sessions of NIR PBM using 10601080 nm LEDs embedded in a helmet. National Library of Medicine For instance, in normal cells the absorption of light by CCO leads to an increase in MMP above baseline and a short surge in ROS production. The most well accepted neurogenic niches are the sub-granular layer of the dentate gyrus of the hippocampus [114], and the subventricular zone (SVZ) of the lateral ventricles [115]. The patient showed a significant improvement in the Montreal Cognitive Assessment score from 18 to 24 and in the Working Memory Questionnaire score from 53 to 10. Pathophysiological Mechanisms in Alzheimer's Disease. However, in cells that already contain excess Ca2+ (a phenomenon called excitotoxicity) PBM provokes the opposite reaction, in other words it lowers excessive levels of cellular calcium, thus promoting cell survival, lowering oxidative stress, and raising MMP back to normal [79]. A large number of clinical trials have failed to show any benefit of the tested drugs in stabilizing or reversing the steady decline in cognitive function that is suffered by dementia patients. Home use tPBM devices can be applied by the caregivers, who consistently report improvements in their own quality of life. There has been considerable interest in the use of coenzyme Q10 supplements in AD and other neurodegenerative diseases [158]. Next to cancer, Alzheimer's disease (AD) and dementia is probably the most worrying health problem facing the Western world today. [9] investigated two cell lines lacking CCO, one mouse line with the Cox10 knocked out (that could not synthesise the heme a cofactor) and a second human line with a mutation in the mtDNA gene coding for tRNA lysine (that lacked three critical CCO subunits). A subsequent study from the same group showed that 40 Hz pulsed light was neuroprotective, and improved cognitive performance in the Tau P301S and CK-p25 mouse models of neurodegeneration [140]. If it can be conclusively shown that tPBM stimulates neuroplasticity and synaptogenesis in humans as well as mice, then this opens the door to a wide range of clinical applications [126]. Photobiomodulation: Lasers vs. light emitting diodes? Dementia is the clinical term used to describe a broad range of brain disorders that affect cognitive and executive functioning and memory [32]. 1 It is estimated that approximately 15 million people around the world suffer from this disease. Cooper CE; Cope M; Springett R; Amess PN; Penrice J; Tyszczuk L; Punwani S; Ordidge R; Wyatt J; Delpy DT, Use of Mitochondrial Inhibitors to Demonstrate That Cytochrome Oxidase Near-Infrared Spectroscopy Can Measure Mitochondrial Dysfunction Noninvasively in the Brain, Multiple roles of cytochrome c oxidase in mammalian cells under action of red and IR-A radiation, Wong-Riley MT; Liang HL; Eells JT; Chance B; Henry MM; Buchmann E; Kane M; Whelan HT, Photobiomodulation directly benefits primary neurons functionally inactivated by toxins: Role of cytochrome c oxidase, Proposed Mechanisms of Photobiomodulation or Low-Level Light Therapy, Lima PL; Pereira CV; Nissanka N; Arguello T; Gavini G; Maranduba CMDC; Diaz F; Moraes CT, Photobiomodulation enhancement of cell proliferation at 660 nm does not require cytochrome c oxidase, Spitler R; Ho H; Norpetlian F; Kong X; Jiang J; Yokomori K; Andersen B; Boss GR; Berns MW, Combination of low level light therapy and nitrosyl-cobinamide accelerates wound healing, Nez-lvarez C; Del Olmo-Aguado S; Merayo-Lloves J; Osborne NN, Near infra-red light attenuates corneal endothelial cell dysfunction in situ and in vitro, Wu S; Zhou F; Wei Y; Chen WR; Chen Q; Xing D, Cancer Phototherapy via Selective Photoinactivation of Respiratory Chain Oxidase to Trigger a Fatal Superoxide Anion Burst, Mitochondrial cytochrome c oxidase is not the primary acceptor for near infrared lightIt is mitochondrial bound water: The principles of low-level light therapy, Mitochondrial Signaling in Mammalian Cells Activated by Red and Near-IR Radiation, Absorption of monochromatic and narrow band radiation in the visible and near IR by both mitochondrial and non-mitochondrial photoacceptors results in photobiomodulation, Kamiski MM; Roth D; Sass S; Sauer SW; Krammer PH; Glow K, Manganese superoxide dismutase: A regulator of T cell activation-induced oxidative signaling and cell death, Diversity of animal opsin-based pigments and their optogenetic potential, Old Chromophores, New Photoactivation Paradigms, Trendy Applications: Flavins in Blue Light-Sensing Photoreceptors, Chaves I; Pokorn R; Byrdin M; Hoang N; Ritz T; Brettel K; Essen L-O; Van Der Horst GTJ; Batschauer A; Ahmad M, The Cryptochromes: Blue Light Photoreceptors in Plants and Animals, Katz B; Payne R; Minke B The olfactory dysfunction was reversed as measured by the Alberta Smell Test and peanut butter odor detection test. PBM (660 nm) caused increased cell proliferation in both wild type and CCO knock out cells, together with increased ATP and citrate synthase levels. PBM has been shown to slow attenuation of BDNF via the ERK/CREB pathway, thus positively affecting dendritic morphogenesis and improved neuronal connectivity [122]. An official website of the United States government. Gamma Entrainment Binds Higher-Order Brain Regions and Offers Neuroprotection. A wide variety of evidence suggests that PBM can be utilized for neuroprotection, essentially, to protect cells from damage, to promote their survival and longevity, and reverse apoptotic signaling processes. Sweeney MD; Montagne A; Sagare AP; Nation DA; Schneider LS; Chui HC; Harrington MG; Pa J; Law M; Wang DJ; et al. The fact that PBMT may produce a large range of beneficial changes in the brain, and is without any major side-effects, suggests it should be more widely tested for AD and dementia in large controlled trials. Specifically, it is believed to modulate dendritic structure to facilitate improved synaptic transmission [121]. BDNF is also a mediator of the protein synapsin-1, which improves synaptogenesis by accelerating the development of neuronal fibers and maintaining synaptic contacts [123]. Why Have Antioxidants Failed in Clinical Trials? Any therapy (such as PBM) that can switch the microglial phenotype from M1 to M2 may be helpful for AD. AD was first described by Alois Alzheimer (18641915) who published his report in 1911 [36]. The same procedure had major therapeutic benefits for reducing the infarct area in heart attack models [135,136], and in ameliorating ischemic kidney injury [137]. Neuroinflammation and reactive gliosis are hallmarks of AD [43]. In 2016 an important study from Iaccarino et al., working at MIT, reported that 40 Hz pulsed blue light could reduce the load of amyloid- (A)140 and A 142 peptides and lessen the amyloid plaque burden in the visual cortex of the brain in a mouse model of AD [139]. In fact the most noticeable heating effect (if any) is felt on the skin of the scalp. PhotobiomodulationOriginal Research. Safe and effective doses have been found in animal models, and the first human case studies have provided reasons to undertake large-scale clinical trials. For many years, it was thought that the adult brain was incapable of growing new brain cells. found that in normal fibroblasts PBM could activate NF B via generation of low amounts of ROS from mitochondria that had been stimulated [100]. This notion is supported by the fact that low-level light irradiation such as PBM causes increased oxygen consumption, and is bolstered by the fact that the majority of oxygen consumption occurs at complex IV, and moreover that the addition of sodium azide, a CCO inhibitor, abrogates the effects of PBM [10,11]. If these IWL were inside the mitochondria, then the lowering of viscosity as a result of the energy absorption, could allow the molecular rotor, which is ATP synthase, to rotate faster and produce more ATP. BDNF has also been linked to improvements in neuroplastic adaptation, which is especially important in cases of traumatic brain injury and stroke [125]. An 810 nm laser connected to a fiber optic cable was used in contact with the tibia after making a small incision in the skin to deliver 1 J/cm2. There are two isoforms expressed in the adult human brain (4R and 3R) mainly in axons of neurons. Stockholdings: Global Photon Inc., Bee Cave, TX, USA; Mitonix, Newark, DE, USA. Cryptochromes are a special sub-class of flavoproteins that act as bluelight receptors in plants, animals and even humans [19]. While acute inflammation is positive, chronic inflammation can have very negative effects. This vasodilation then promotes improved circulation, which in turn leads to improved cerebral oxygenation in a similar manner to that observed with pulsed electromagnetic fields [69]. An important paper showed that the health giving benefits of exercise were removed when humans were administered antioxidants [87]. declares the following potential conflicts of interest. Vascular dysfunction is often described as causing vascular dementia, but there is increasing evidence that it plays a role in AD as well [47]. ProBDNF negatively regulates neuronal remodeling, synaptic transmission and synaptic plasticity in hippocampus, Yan X; Liu J; Zhang Z; Li W; Sun S; Zhao J; Dong X; Qian J; Sun H, Low-level laser irradiation modulates brain-derived neurotrophic factor mRNA transcription through calcium-dependent activation of the ERK/CREB pathway, Barbieri R; Contestabile A; Ciardo MG; Forte N; Marte A; Baldelli P; Benfenati F; Onofri F, Synapsin I and Synapsin II regulate neurogenesis in the dentate gyrus of adult mice, Low-Level Laser Therapy Rescues Dendrite Atrophy via Upregulating BDNF Expression: Implications for Alzheimers Disease, Wang Y; Huang Y-Y; Wang Y; Lyu P; Hamblin MR, Photobiomodulation of human adipose-derived stem cells using 810 nm and 980 nm lasers operates via different mechanisms of action, Dendritic structural plasticity and neuropsychiatric disease, Principles of Neuroplasticity-Based Rehabilitation, Neuroplasticity and memory formation in major depressive disorder: An imaging genetics perspective on serotonin and BDNF, Epigenetic mechanisms of neuroplasticity and the implications for stroke recovery, Tomaszczyk JC; Green NL; Frasca D; Colella B; Turner GR; Christensen BK; Green RE, A. Schiffer et al. in 2011 [142]. One of the first human trials of tPBM for AD to be reported, was reported by Saltmarche et al. official website and that any information you provide is encrypted It should be noted that there is considerable overlap between the chromophores, and that the NIR absorbed by structured water is likely to be longer wavelength (>950 nm). A related hypothesis concerns the influence of vascular dysfunction and micro-hemorrhages [46]. About 70% of the risk is probably genetic, with many genes proposed to be involved [37]. Lima et al. Photobiomodulation Therapy: Communicating with Stem Cells for Regeneration? Alzheimer's disease (AD), as a neurodegenerative disorder, usually develops slowly but gradually worsens. A range of neuroprotective approaches based on natural products are under investigation for treatment of AD [80]. Psychiatry, Rodrguez-Rodrguez A; Egea-Guerrero JJ; Murillo-Cabezas F; Carrillo-Vico A, Oxidative Stress in Traumatic Brain Injury, The Role of Oxidative Stress and Inflammation in Cardiovascular Aging, Wang X; Wang W; Li L; Perry G; Lee H-G; Zhu X, Oxidative stress and mitochondrial dysfunction in Alzheimers disease. Introduction: Alzheimer disease (AD) is characterized by the decline of cognitive functions such as learning and memory. Photobiomodulation and visual stimulation against cognitive decline and Alzheimer's disease pathology: A systematic review Since the forehead is without hair, which can block the light, it is a popular choice for tPBM. Intraneuronal beta-Amyloid Aggregates, Neurodegeneration, and Neuron Loss in Transgenic Mice with Five Familial Alzheimers Disease Mutations: Potential Factors in Amyloid Plaque Formation, Lu Y; Wang R; Dong Y; Tucker D; Zhao N; Ahmed ME; Zhu L; Liu TC-Y; Cohen RM; Zhang Q, Low-level laser therapy for beta amyloid toxicity in rat hippocampus, Da Luz Eltchechem C; Salgado ASI; Zangaro RA; da Silva Pereira MC; Kerppers II; da Silva LA; Parreira RB, Transcranial LED therapy on amyloid-beta toxin 2535 in the hippocampal region of rats, Neuroprotective effect of a new photobiomodulation technique against A, Saltmarche AE; Naeser MA; Ho KF; Hamblin MR; Lim L, Significant Improvement in Cognition in Mild to Moderately Severe Dementia Cases Treated with Transcranial Plus Intranasal Photobiomodulation: Case Series Report, Effects of Home Photobiomodulation Treatments on Cognitive and Behavioral Function, Cerebral Perfusion, and Resting-State Functional Connectivity in Patients with Dementia: A Pilot Trial.
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