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Pre-conditioning with Remote Photobiomodulation Modulates the Brain Transcriptome and Protects Against MPTP Insult in Mice
摘要： Transcranial photobiomodulation (PBM), which involves the application of low-intensity red to near-infrared light (600-1100nm) to the head, provides neuroprotection in animal models of various neurodegenerative diseases. However, the absorption of light energy by the human scalp and skull may limit the utility of transcranial PBM in clinical contexts. We have previously shown that targeting light at peripheral tissues (i.e. “remote PBM”) also provides protection of the brain in an MPTP mouse model of Parkinson’s disease, suggesting remote PBM might be a viable alternative strategy for overcoming penetration issues associated with transcranial PBM. This present study aimed to determine an effective pre-conditioning regimen of remote PBM for inducing neuroprotection and elucidate the molecular mechanisms by which remote PBM enhances the resilience of brain tissue. Balb/c mice were irradiated with 670nm light (4J/cm2 per day) targeting dorsum and hindlimbs for 2, 5 or 10 days, followed by injection of the parkinsonian neurotoxin MPTP (50mg/kg) over two consecutive days. Despite no direct irradiation of the head, 10 days of pre-conditioning with remote PBM significantly attenuated MPTP-induced loss of midbrain tyrosine hydroxylase-positive dopaminergic cells and mitigated the increase in FOS-positive neurons in the caudate-putamen complex. Interrogation of the midbrain transcriptome by RNA microarray and pathway enrichment analysis suggested upregulation of cell signaling and migration (including CXCR4+ stem cell and adipocytokine signaling), oxidative stress response pathways and modulation of the blood-brain barrier following remote PBM. These findings establish remote PBM preconditioning as a viable neuroprotective intervention and provide insights into the mechanisms underlying this phenomenon.
关键词： MPTP,microarray,Parkinson’s disease,mouse model,neuroprotection,photobiomodulation
更新于2025-09-23 15:23:52
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Therapeutic Efficacy of Home-Use Photobiomodulation Devices: A Systematic Literature Review
摘要： Objective: Perform systematic literature review on photobiomodulation (PBM) devices used at home for nonesthetic applications. Background: Home-use PBM devices have been marketed for cosmetic and therapeutic purposes. This is the first systematic literature review for nonesthetic applications. Methods: A systematic literature search was conducted for PBM devices self-applied at home at least thrice a week. Two independent reviewers screened the articles and extracted the data. Treatment dosage appropriateness was compared to the World Association for Laser Therapy (WALT) recommendations. The efficacy was evaluated according to the relevant primary end-point for the specific indication. Results: Eleven studies were suitable. Devices were applied for a range of indications, including pain, cognitive dysfunction, wound healing, diabetic macular edema, and postprocedural side effects, and were mostly based on near-infrared, pulsed light-emitting diodes with dosages within WALT recommendations. Regarding efficacy, studies reported mostly positive results. Conclusions: Home-use PBM devices appear to mediate effective, safe treatments in a variety of conditions that require frequent applications. Conclusive evaluation of their efficacy requires additional, randomized controlled studies.
关键词： low-level laser therapy,home use,over the counter,self-applied,photobiomodulation
更新于2025-09-23 15:22:29
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Photobiomodulation Preconditioning Prevents Cognitive Impairment in a Neonatal Rat Model of Hypoxia-ischemia
摘要： Neonatal hypoxia-ischemia (HI) injury caused by oxygen deprivation is the most common cause of mortality and severe neurologic deficits in neonates. The present work evaluated the preventative effect of photobiomodulation (PBM) preconditioning, and its underlying mechanism of action on brain damage in a HI model in neonatal rats. According to the optimal time response of ATP levels in brain samples removed from normal rats, a PBM preconditioning regimen (808 nm CW laser, 1 cm2 spot, 100 mW/cm2, 12 J/cm2) was delivered to the scalp 6 hours before HI. PBM preconditioning significantly attenuated cognitive impairment, volume shrinkage in the brain, neuron loss, dendritic and synaptic injury after HI. Further mechanistic investigation found that PBM preconditioning could restore HI-induced mitochondrial dynamics and inhibit mitochondrial fragmentation, followed by a robust suppression of cytochrome c release, and prevention of neuronal apoptosis by inhibition of caspase activation. Our work suggests that PBM preconditioning can attenuate HI-induced brain injury by maintaining mitochondrial dynamics and inhibiting the mitochondrial apoptotic pathway.
关键词： Hypoxia-ischemia,Mitochondria,Cognitive impairment,Neuroprotection,Photobiomodulation preconditioning
更新于2025-09-23 15:22:29
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Effects of photobiomodulation therapy for androgenic alopecia: A meta-analysis of randomized controlled trials
摘要： The authors conducted this meta-analysis of randomized controlled trials (RCTs) to assess the effects of photobiomodulation therapy (PBMT) in the treatment of androgenic alopecia (AA). RCTs published in Pubmed, Web of Science, and Embase were systematically reviewed to identify the effects of PBMT in AA patients. The outcome measures included hair density and hair growth. Results were expressed as weighted mean difference (WMD) with 95% confidence interval (95%CI) and a risk ratio (RR) of 95%CI. A fixed-effects model or a randomized-effects model was performed according to the heterogeneity among the included studies. Nine RCTs met the inclusion criteria and were included in this meta-analysis. The mean change from baseline in hair density was 36.78 ± 23.84/cm2 in the PBMT group as compared with 8.88 ± 19.56/cm2 in the control group. Patients who received PBMT had a greater increase in hair density than those treated with a sham device (WMD = 18.56/cm2, 95%CI: 13.22, 23.89; P < 0.001). Moreover, PBMT was associated with a 42.43% increase in hair growth as compared with the sham device treatment (WMD = 42.43, 95%CI: 28.58, 56.28; P < 0.001). A greater rate of patients who were treated with PBMT achieved an improvement in hair regrowth than those with the sham device (RR = 1.32, 95%CI: 1.09, 1.58; P = 0.003). This study indicated that PBMT seemed to be a promising noninvasive treatment for patients with AA since it could improve hair density and stimulate hair growth. However, considering the potential limitations in this study, more large-scale RCTs are needed to verify our findings.
关键词： photobiomodulation therapy,meta-analysis,hair density,androgenic alopecia
更新于2025-09-23 15:21:01
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Photobiomodulation of human osteoblasta??like cells <i>in vitro</i> by lowa??intensity pulsed LED light
摘要： Visible light irradiation is an emerging area in regenerative medicine research. We hypothesized that low intensity pulsed LED light irradiance may exert photobiomodulatory effects on cultured osteoblast-like cells. To test this hypothesis, we investigated cell proliferation and markers of cell maturation and metabolic activity following pulsed LED irradiance. Monolayer explant cultures of human osteoblast-like cells were exposed four times in 24-hour intervals to 2 minutes of pulsed white LED irradiance of 2.4-2.5 mW/cm2 and its different spectra of 0.2-0.5 mW/cm2 (frequency range of 10-40 Hz). Cell proliferation was estimated from microscopic cell counting and cell death by lactate dehydrogenase activity in culture media (measured by a colorimetric method). The early markers of osteoblast maturation and metabolic activity, i.e. cellular alkaline phosphatase activity and osteocalcin content, were measured using a colorimetric method and ELISA, respectively. Irradiance of 40 Hz caused the highest increase in cell number (p<0.01). Osteocalcin content in cells decreased following 40 Hz and 10 Hz irradiance (p<0.05). The 40 Hz blue range irradiance (diffuse transmittance 420-580 nm, maximal cell irradiance 0.5 mW/cm2) caused a decrease in alkaline phosphatase cellular activity (p<0.001) and an increase in media osteocalcin content (p<0.05). The 40 Hz green range (diffuse transmittance 560-650 nm, maximal cell irradiance 0.4 mW/cm2) irradiance caused an increase in the number of cells and in cell death. In summary, pulsed (40 Hz) white light irradiance has photomodulatory effects, with its green range spectrum affecting cell proliferation and cell death, and its blue range spectrum affecting cellular maturation and metabolism. The results indicate a low intensity threshold of photobiomodulation of osteoblast-like cells in vitro.
关键词： cell maturation,pulse light photobiomodulation,cell death,osteoblast-like cells,LED
更新于2025-09-23 15:21:01
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A comparative randomized clinical trial to assess the effectiveness of the diode lasers in both contact and non-contact mode and 0.1% triamcinolone acetonide mouth paste in treatment of oral ulcersa??an in vivo study
摘要： Introduction Ulceration is the breach in the oral epithelium, which typically exposes nerve endings in the underlying lamina propria, resulting in pain and soreness. Oral ulcers are very common, with an estimated point prevalence of 4% worldwide. Current treatment options available include topical agents, systemic and topical corticosteroids, cauterization, antibiotics, multivitamins, adhesive pastes, local antiseptics, analgesics, anti-inflammatory, mouth rinses containing active enzymes, and photobiomodulation therapy (PBMT). Laser constitutes an alternative to processes that alleviate pain and inflammatory reaction and is now widely used in management of diseases that require tissue regeneration. Keeping in mind the analgesic, anti-inflammatory, and bio-stimulatory properties of PBMT, we conducted a study to analyze the effectiveness of PBMT in both contact and non-contact mode in relation to pain in ulcer, size, and healing time. Method A total of 45 patients with ulcers were included and randomly divided them into 3 equal groups undergoing laser therapy (contact mode, non-contact mode) and conventional treatment, i.e., 0.1%triamcinolone acetonide. All the patients were examined on day 0, 2, 4, and 6 to check for pain, size of ulcer, and healing time. Also, frequency of recurrence was also assessed in a 1-year follow-up. Results ANOVA followed by post hoc comparison by Bonferroni method was done which revealed that PBMT in non-contact mode provided immediate pain relief and significantly reduced healing time with less recurrence followed by PBMT in contact mode. Conclusion PBMT in non-contact mode was more effective in relieving pain and reducing the healing time during the treatment of oral ulcers compared with triamcinolone acetonide and laser in contact mode. Also, less recurrence was seen even after 1-year of follow-up. Hence, it can be concluded that PBMT in non-contact and contact mode is a safe and clinically effective therapy for treating oral ulcers.
关键词： VAS (visual analogue scale),Photobiomodulation therapy (PBMT),RAU (recurrent aphthous ulcer)
更新于2025-09-23 15:21:01
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Evaluation of fluorescence biomodulation in the real-life management of chronic wounds: the EUREKA trial
摘要： Objective: Fluorescence biomodulation (FB), a form of photobiomodulation (PBM) that is also known as low energy level light (LELL), has become an increasingly used clinical tool to induce wound healing in wounds that remain recalcitrant to treatment. In a real-life clinical setting, the aim of the EUREKA (EvalUation of Real-lifE use of Klox biophotonic system in chronic wound mAnagement) study was to confirm the efficacy and safety of LumiHeal, a system based on FB, in the treatment of chronic wounds such as venous leg ulcers (VLUs), diabetic foot ulcers (DFUs) and pressure ulcers (PUs). The effects of this FB system on the modulation of wound healing in chronic ulcers through FB induction were previously examined in an interim analysis of this study. Method: A multicenter, prospective, observational, uncontrolled trial in 12 clinical sites in Italy. The wound was cleansed with saline and a 2mm thick layer of a chromophore gel was applied to the affected area in a biweekly regimen. The area was then illuminated with the LED activator for five minutes at a distance of 5cm. Treatment was used in combination with standard of care specific to each type of chronic wound (VLU, DFU, PU). Wound area evaluation was assessed using the Silhouette Imaging System and quality of life (QoL) with the Cardiff Wound Impact Schedule (CWIS). A seven-point evaluation of the clinicans’ view was also examined. Results: We enrolled 100 subjects, with the final analysis including 99 patients/ulcers consisting of 52 VLUs, 32 DFUs and 15 PUs. Total wound closure at the end of the study was achieved in 47 patients by aetiology: 26 VLUs (50% of VLUs); 16 DFUs (50% of DFUs); and five PUs (33.3% of PUs). The mean wound area regression at last study assessment was significant for VLUs (41.0%; p<0.001) and DFUs (52.4%; p<0.001). After four weeks of treatment, it was possible to significantly predict if the ulcer would respond (defined as a decrease of wound size) to the study treatment. Adherence was high (95.2%) and no related serious adverse events were reported during the study. QoL significantly improved, with an increase of 15.4% of the total score, using the CWIS (p<0.001). Conclusion: The study confirmed a positive efficacy profile of the FB system in inducing the wound healing process in three different types of hard-to-heal chronic wounds. The treatment was shown to be safe and well tolerated by the patients, with a significant improvement in patient QoL. This approach offers an effective modality for the treatment of hard-to-heal chronic ulcers.
关键词： pressure ulcers,phototherapy,photobiomodulation,diabetic foot ulcers,biophotonics,fluorescence biomodulation,venous leg ulcers
更新于2025-09-23 15:21:01
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A Protocol for Transcranial Photobiomodulation Therapy in Mice
摘要： Transcranial photobiomodulation is a potential innovative noninvasive therapeutic approach for improving brain bioenergetics, brain function in a wide range of neurological and psychiatric disorders, and memory enhancement in age-related cognitive decline and neurodegenerative diseases. We describe a laboratory protocol for transcranial photobiomodulation therapy (PBMT) in mice. Aged BALB/c mice (18 months old) are treated with a 660 nm laser transcranially, once daily for 2 weeks. Laser transmittance data shows that approximately 1% of the incident red light on the scalp reaches a 1 mm depth from the cortical surface, penetrating the dorsal hippocampus. Treatment outcomes are assessed by two methods: a Barnes maze test, which is a hippocampus-dependent spatial learning and memory task evaluation, and measuring hippocampal ATP levels, which is used as a bioenergetics index. The results from the Barnes task show an enhancement of the spatial memory in laser-treated aged mice when compared with age-matched controls. Biochemical analysis after laser treatment indicates increased hippocampal ATP levels. We postulate that the enhancement of memory performance is potentially due to an improvement in hippocampal energy metabolism induced by the red laser treatment. The observations in mice could be extended to other animal models since this protocol could potentially be adapted to other species frequently used in translational neuroscience, such as rabbit, cat, dog, or monkey. Transcranial photobiomodulation is a safe and cost-effective modality which may be a promising therapeutic approach in age-related cognitive impairment.
关键词： low-level laser therapy,optical properties,red light,hippocampus,mouse,aging,Transcranial photobiomodulation,learning,memory,Issue 141,Neuroscience
更新于2025-09-23 15:21:01
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Acute physiological responses to combined blood flow restriction and low-level laser
摘要： Purpose Blood flow restriction (BFR) is an innovation in fitness to train muscles with low loads at low oxygen levels. Low-level laser therapy (LLLT) is a bio-energetic approach to alleviate muscle fatigue during resistance training. This study investigated the immediate effect of LLLT pre-conditioning on BFR that accelerates muscle fatigue due to ischemia. Methods Fifteen young adults participated in this study of a crossover randomized design. They completed a low-load contraction with various pre-conditioning (blood flow restriction with low-level laser therapy (LLLT + BFR), blood flow restriction with sham low-level laser therapy (BFR), and control). Force fluctuation dynamics, muscle oxygen saturation of hemoglobin and myoglobin (SmO2), and discharge patterns of motor units (MU) were compared. Results Normalized SmO2 during low-load contractions significantly varied with the pre-contraction protocols (Control (83.6 ± 3.0%) > LLLT + BFR (70.3 ± 2.8%) > BFR (55.4 ± 2.4%). Also, force fluctuations and MU discharge varied with the pre-contraction protocols. Multi-scale entropy and mean frequency of force fluctuations were greater in the LLLT + BFR condition (31.95 ± 0.67) than in the BFR condition (29.47 ± 0.73). The mean inter-spike interval of MUs was greater in the LLLT + BFR condition (53.32 ± 2.70 ms) than in the BFR condition (45.04 ± 1.08 ms). In particular, MUs with higher recruitment thresholds exhibited greater LLLT-related discharge complexity (LLLT + BFR (0.201 ± 0.012) > BFR (0.154 ± 0.006)). Conclusions LLLT pre-conditioning can minimize the BFR-related decline in muscle oxygen saturation, leading to force gradation and MU discharge in a cost-effective and complex manner.
关键词： Myoglobin,Motor unit,Force fluctuations,Electromyography,Photobiomodulation,Hypoxia
更新于2025-09-23 15:19:57
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Transcranial Photobiomodulation (tPBM) With 1,064a??nm Laser to Improve Cerebral Metabolism of the Human Brain In Vivo
摘要： Background and Objectives: In our previous proof‐of‐principle study, transcranial photobiomodulation (tPBM) with 1,064‐nm laser was reported to significantly increase concentration changes of oxygenated hemoglobin (Δ[HbO]) and oxidized‐state cytochrome c oxidase (Δ[oxi‐CCO]) in the human brain. This paper further investigated (i) its validity in two different subsets of young human subjects at two study sites over a period of 3 years and (ii) age‐related effects of tPBM by comparing sham‐controlled increases of Δ[HbO] and Δ[oxi‐CCO] between young and older adults. Study Design/Materials and Methods: We measured sham‐controlled Δ[HbO] and Δ[oxi‐CCO] using broadband near‐infrared spectroscopy (bb‐NIRS) in 15 young (26.7 ± 2.7 years of age) and 5 older (68.2 ± 4.8 years of age) healthy normal subjects before, during, and after right‐forehead tPBM/sham stimulation with 1,064‐nm laser. Student t tests were used to test statistical differences in tPBM‐induced Δ[HbO] and Δ[oxi‐CCO] (i) between the 15 young subjects and those of 11 reported previously and (ii) between the two age groups measured in this study. Results: Statistical analysis showed that no significant difference existed in Δ[HbO] and Δ[oxi‐CCO] during and post tPBM between the two subsets of young subjects at two study sites over a period of 3 years. Furthermore, the two age groups showed statistically identical net increases in sham‐controlled Δ[HbO] and Δ[oxi‐CCO]. Conclusions: This study provided strong evidence to validate/confirm our previous findings that tPBM with 1,064‐nm laser enables to increase cerebral Δ[HbO] and Δ[oxi‐CCO] in the human brain, as measured by bb‐NIRS. Overall, it demonstrated the robust reproducibility of tPBM being able to improve cerebral hemodynamics and metabolism of the human brain in vivo in both young and older adults.
关键词： transcranial photobiomodulation,cytochrome c oxidase,reproducibility,broadband near‐infrared spectroscopy,tPBM
更新于2025-09-23 15:19:57