首页> 外文会议>Mechanisms for Low-Light Therapy; Progress in Biomedical Optics and Imaging; vol.7 no.26 >EFFECT OF WAVELENGTH AND FLUENCE ON MORPHOLOGY, CELLULAR AND GENETIC INTEGRITY OF DIABETIC WOUNDED HUMAN SKIN FIBROBLASTS
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EFFECT OF WAVELENGTH AND FLUENCE ON MORPHOLOGY, CELLULAR AND GENETIC INTEGRITY OF DIABETIC WOUNDED HUMAN SKIN FIBROBLASTS

机译:波长和通量对糖尿病伤口人皮肤成纤维细胞形态,细胞和遗传完整性的影响

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An alternative treatment modality for diabetic wound healing includes low level laser therapy (LLLT). Biostimulation of such wounds may be of benefit to patients by reducing healing time. Structural, cellular and genetic events in diabetic wounded human skin fibroblasts (WS1) were evaluated after exposing cells in culture to a Helium-Neon (632.8nm), a Diode laser (830nm) and a Nd:YAG (Neodynium:Yttrium-Allumina-Gallium) laser (1064nm) at either 5J/cm~2 or 16J/cm~2. Cells were exposed twice a week and left 24 hours post-irradiation prior to measuring effects. Structural changes were evaluated by assessing colony formation, haptotaxis and chemotaxis. Cellular changes were evaluated using cell viability, (adenosine-triphosphate, ATP production), and proliferation, (alkaline phosphatase, ALP and basic fibroblast growth factor, bFGF expression), while the Comet assay evaluated DNA damage and cytotoxicity was determined assessing membrane permeability for lactate dehydrogenase (LDH). Caspase 3/7 activity was used as an estimate of apoptosis as a result of irradiation. The irradiated diabetic wounded cells showed structural, cellular as well as molecular resilience comparable to that of unwounded normal skin fibroblast cells. With regards to fluence, 5J/cm~2 elicit positive cellular and structural responses while 16J/cm~2 increases cellular and genetic damage and cellular morphology is altered. Different wavelengths of LLLT influences the beneficial outcomes of diabetic wounded cells and although all three wavelengths elicit cellular effects, the penetration depth of 830nm plays a significant role in the healing of diabetic wounded human fibroblast cells. Results from this study validate the contribution of LLLT to wound healing and elucidate the biochemical effects at a cellular level while highlighting the role of different dosages and wavelengths in LLLT.
机译:糖尿病伤口愈合的替代治疗方式包括低水平激光治疗(LLLT)。通过减少愈合时间,对这些伤口进行生物刺激可能对患者有益。在将培养的细胞暴露于氦氖(632.8nm),二极管激光(830nm)和Nd:YAG(钕:钇铝矾土-)后,评估了糖尿病人皮肤成纤维细胞(WS1)的结构,细胞和遗传事件。激光(1064nm)在5J / cm〜2或16J / cm〜2下发射。每周两次暴露细胞,并在辐照后24小时放置,然后再测量效果。通过评估菌落形成,触觉趋化和趋化性来评估结构变化。使用细胞活力(三磷酸腺苷,ATP产生)和增殖(碱性磷酸酶,ALP和碱性成纤维细胞生长因子,bFGF表达)评估细胞变化,而彗星试验评估DNA损伤并确定细胞毒性,评估膜通透性乳酸脱氢酶(LDH)。半胱天冬酶3/7活性被用作辐照导致的细胞凋亡的估计。辐照的糖尿病伤口细胞显示出与未受伤的正常皮肤成纤维细胞相当的结构,细胞和分子弹性。就注量而言,5J / cm〜2引起细胞和结构阳性反应,而16J / cm〜2则增加细胞和遗传损伤,细胞形态发生改变。 LLLT的不同波长会影响糖尿病伤口细胞的有益结果,尽管所有三个波长均会引起细胞效应,但830nm的穿透深度在糖尿病伤口人成纤维细胞的愈合中起着重要作用。这项研究的结果验证了LLLT对伤口愈合的贡献,并阐明了在细胞水平上的生化作用,同时强调了不同剂量和波长在LLLT中的作用。

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