A comparative study of the effects of laser and LED radiation on lipid peroxidation in rat wound fluid

Klebanov, G. I.; Shuraeva, N. Yu.; Chichuk, T. V.; Осипов, А. Н.; Vladimirov, Yu. A.

doi:10.1134/s0006350906020217

Cited by 12 publications

(12 citation statements)

References 17 publications

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“…There has also been evidence that coherent and the non-coherent lights produce similar effects in biological tissues. This fact has been demonstrated in several studies [11,16,33,34] in which both types of light produced positive effects.…”

Section: Discussionmentioning

confidence: 59%

“…However, the biological effect of these light sources has been evaluated individually in previous studies [11,16,33,34]. Regarding possible differences around coherent light (laser) versus noncoherent light (LED), it has been shown that the coherence of light is not a determinant factor to the clinical effects of low-level lasers.…”

Section: Discussionmentioning

confidence: 99%

“…It has also been reported that the photochemical effects in the organism occur independently of light coherence, as the coherence is lost in the most superficial skin layer, before the light is absorbed by the chromophores of the subjacent cells [11]. There is evidence that both coherent and non-coherent lights can stimulate in vitro cell proliferation, transition from the inflammatory to the proliferative phase, and the activity of the superoxide dismutase enzyme, decreasing the oxidative stress [33,34]. There has also been evidence that coherent and the non-coherent lights produce similar effects in biological tissues.…”

Section: Discussionmentioning

confidence: 99%

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Correlation between light transmission and permeability of human dentin

et al. 2011

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The influence of dentin permeability on transdentinal LED light propagation should be evaluated since this kind of phototherapy may further be clinically used to stimulate the metabolism of pulp cells, improving the healing of damaged pulps. This study evaluated the influence of the dentin permeability on the transdentinal LED light (630 nm) transmission. Forty-five 0.5-mm-thick dentin disks were prepared from the coronal dentin of extracted sound human molars. An initial measurement of transdentinal LED light transmission was carried out by illuminating the discs in the occlusal-to-pulpal direction onto a light power sensor to determine light attenuation. The discs were treated with EDTA for smear layer removal, subjected to analysis of hydraulic conductance, and a new measurement of transdentinal LED light transmission was taken. Spearman's correlation coefficient was used for analysis of data and showed a weak correlation between dentin permeability and light attenuation (coefficient= 0.19). This result indicates that higher or lower dentin permeability does not reflect the transdentinal propagation of LED light. Significantly greater transdentinal propagation of light was observed after treatment of dentin surface with EDTA (Wilcoxon test, p<0.05). According to the experimental conditions of this in vitro study, it may be concluded that dentin permeability does not interfere in the transdentinal LED light transmission, and that smear layer removal facilitates this propagation.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Correlation between light transmission and permeability of human dentin

et al. 2011

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“…Specific resonance and non-resonance photophysical mechanisms have also been discussed in the literature (orientational effect of light, effect of gradient forces, dipole-dipole interactions, thermooptic processes) that are capable of inducing photobiological effects, depending on the polarization and coherence of the radiation [14,[36][37][38][39][50][51][52]. Moreover, a number of data [53][54][55][56][57][58][59][60][61][62] indicate that for comparable dose load, the stimulating effect does not depend on either the coherence of the optical radiation or on its polarization. Furthermore, a widely held opinion is that there is no basis for assuming a possible role for coherence and polarization in the interaction between low-intensity optical radiation and biological systems [53,54].…”

mentioning

confidence: 99%

“…catalase, superoxide dismutase, ceruloplasmin (an increase in the anti-oxidant activity of the indicated enzymes, decreased in the pathological state [59,60]); cytochrome c oxidase (acceleration of electron transfer in the respiratory chain as a result of a change in the oxidation-reduction properties of the electron carrier [54]); hemoglobin (an increase in the local concentration of molecular oxygen as a result of photodissociation of oxyhemoglobin; a change in the oxygen-transport function of blood [71,72]; nitrosyl complexes of heme proteins (liberation of NO on exposure to light from the hemoglobin complex and then binding of the NO to cytochrome c oxidase, accompanied by modulation of its activity; vasodilator effect of NO [54,59,60]); molecular oxygen (formation as a result of absorption of photons by O 2 molecules of singlet oxygen, capable of inducing structural rearrangements of the aqueous phase [70]); endogenous porphyrins (uroporphyrins, coproporphyrins, hematoporphyrins) and flavins (photosensitized formation of active forms of oxygen [54,59,60,62]). …”

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confidence: 99%

Effect of polarization and coherence of low-intensity optical radiation on fish embryos

Plavskiĭ

Barulin

2008

J Appl Spectrosc

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We have shown that brief exposure of sturgeon embryos (fertilized roe) in the organogenesis stage to low-intensity radiation in the visible region of the spectrum can have a long-term effect on embryonic and post-embryonic development of the fish, detectable 50 days after the irradiation procedure. The biological effects (size-weight characteristics and hardiness parameters of the fish relative to unfavorable habitat conditions) induced by linearly polarized emission from a monochromatic laser source (helium-neon laser, λ = 632.8 nm, Δλ ≈ 0.02 nm) and a quasi-monochromatic light-emitting diode (LED) source (maximum in emission spectrum λ = 631 nm, Δλ = 15 nm) are practically the same. Going to broadband linearly polarized radiation (λ = 420-800 nm) is accompanied by a decrease in the biological effect.From the results of studies of the effect on embryos from linearly polarized and unpolarized radiation from an LED source and also the effect of linearly polarized, circularly polarized, and unpolarized radiation from a helium-neon laser, we concluded that the type of polarization is of critical importance in realization of the biological effect of radiation. In this case, the maximum stimulating effect (on the size×weight characteristics and the hardiness parameters for juvenile fish) is observed on exposure to linearly polarized radiation; the photobiological effect induced in the same dose range by light with natural polarization (i.e., unpolarized) is significantly less pronounced; the stimulating effect of circularly polarized radiation occupies an intermediate position. Based on the presented data and also on data obtained previously, we conclude that among the resonant and nonresonant photophysical processes (orientational effect of light, effect of gradient forces, dipoledipole interactions, thermooptic processes) capable of inducing photobiological effects dependent on such laser-specific characteristics as polarization and coherence, the determining influence in the processes studied in this work comes from the orientational effect of light and dipole×dipole interactions. And the orientational effect can appear for anisotropic media with liquid-crystal type ordering (especially domains in membranes and multiple-enzyme complexes) both under conditions when there is no resonant absorption and for weakly absorbing structures, and can initiate a change in their conformations and accordingly their functional characteristics.Introduction. At the time the first papers [1-10] appeared identifying the ability of polarized laser radiation in the red region of the spectrum (helium-neon laser, wavelength λ = 632.8 nm) to have a biological and therapeutic effect, in photobiological science no generally accepted data were available on the effect of incoherent light in the visible region of the spectrum on the functional activity of somatic non-retinal cells of animals and humans [11][12][13]. It was assumed [11][12][13] that in the absence of exogenous dyes, there could be a pronounced effect on biosynthetic processes i...

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Molecular mechanisms of photochemotherapy (Review)

Zalesskayaa¹,

Улащик²

2009

J Appl Spectrosc

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Mechanisms of photophysical, photobiological, and therapeutic action of light on blood in vivo are discussed based on results of spectral and clinical studies of blood, plasma, and erythrocytes. Spectral manifestations of photochemical reactions initiated in blood by therapeutic doses of radiation in vivo with light of different wavelengths are considered. Spectral and clinical results of blood investigations are compared for patients whose complex treatment included intravenous blood irradiation and magnetotherapy. Mechanisms for secondary (dark) reactions induced by the action of light on blood in vivo are discussed. The radiation of laser and non-laser light sources used at present for intravenous blood irradiation (365, 405, 450, 530, 632, 635, 808 nm) is shown to fall within hemoglobin absorption bands. The conclusion is made that blood absorption of laser and non-laser light radiation results in functional alteration of hemoglobin as a possible primary photoacceptor absorbing light radiation of the above wavelengths. The therapeutic effect of intravenous blood irradiation is initiated by hemoglobin functional activity modulation. Phototherapy is a means to correct it. Intravenous phototherapy should be considered as a therapeutic method that changes (provided that the dosage is correct) the balance of active oxygen species production and their inhibition by antioxidants.

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A comparative study of the effects of laser and LED radiation on lipid peroxidation in rat wound fluid

Cited by 12 publications

References 17 publications

Correlation between light transmission and permeability of human dentin

Correlation between light transmission and permeability of human dentin

Effect of polarization and coherence of low-intensity optical radiation on fish embryos

Molecular mechanisms of photochemotherapy (Review)

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