Defence Institute of Physiology and Allied Sciences, Delhi, India.
Laser Science and Technology Centre, Metcalfe House, Delhi, India.
PLoS One. 2020 Mar 19;15(3):e0230175. doi: 10.1371/journal.pone.0230175. eCollection 2020.
High energy laser, particularly 532 nm, is widely used in defense and medical applications and there is need to address its occupational safety. Thermal and non-thermal effects of 532 nm high energy laser on skin are cause of concern. This study indicates impact of 532 nm laser on rat skin and first of its kind of attempt to understand transcriptional activation of genes as an early response following laser exposure. Skin of experimental rats were exposed to 532 nm radiance at 0.1, 0.25 and 0.50 W/cm2 for 10 sec. Thermographic changes of skin exposed to 532 nm laser exhibited increased Tmax temperature in radiance dependent manner. After thermal imaging, skin of experimental rats was collected 1 h post laser exposure for studying differential gene expression. The skin exposed to lower power density (0.1 W/cm2) did not show significant changes in expression of gene pathways studied. At moderate radiance (0.25 W/cm2), predominantly canonical wnt/B-catenin pathway genes notch1, axin2, ccdn1, wnt5a and redox homeostasis genes; txn1, nqo1 and txnrd1 were expressed. At higher radiance (0.5 W/cm2), significant repression of genes related to wound healing process particularly notch/wnt pathway viz. hes5, wnt1, wn3b with higher expression of dab2 was recorded. The data obtained from these studies would help in drawing safety limits for skin exposure to 532 nm laser. Further, genes expressed at moderate and high level of radiance exposure to skin were distinct and differential and provide new avenue to configure pathway to counteract laser induced delay in tissue injury and hair follicular damage.
高能量激光,特别是 532nm,在国防和医疗应用中得到广泛应用,因此需要解决其职业安全问题。532nm 高能量激光对皮肤的热效应和非热效应引起了人们的关注。本研究表明 532nm 激光对大鼠皮肤的影响,并且首次尝试了解激光照射后作为早期反应的基因转录激活。实验大鼠的皮肤在 0.1、0.25 和 0.50 W/cm2 的 532nm 辐照度下暴露 10 秒。皮肤暴露于 532nm 激光后的热成像显示出随辐照度增加的 Tmax 温度。热成像后,在激光暴露后 1 小时收集实验大鼠的皮肤,用于研究差异基因表达。在较低的功率密度(0.1W/cm2)下,研究的基因途径的表达没有显示出显著变化。在中等辐照度(0.25W/cm2)下,主要的经典 wnt/B-连环蛋白途径基因 notch1、axin2、ccdn1、wnt5a 和氧化还原稳态基因 txn1、nqo1 和 txnrd1 表达。在较高的辐照度(0.5W/cm2)下,与伤口愈合过程相关的基因,特别是 notch/wnt 途径的基因 hes5、wnt1、wn3b 表达受到显著抑制,dab2 的表达增加。从这些研究中获得的数据将有助于为皮肤暴露于 532nm 激光制定安全限制。此外,皮肤在中等和高辐照度暴露下表达的基因是不同的,这为配置对抗激光诱导的组织损伤和毛囊损伤的途径提供了新的途径。