目的复制UVA诱导的HaCaT细胞凋亡模型,研究UVA对细胞内c-jun和环氧合酶-2（cyclooxygenase-2,COX-2）的影响,从而探究扇贝多肽（Polypeptide from Chlamys far-reri,PCF）抑制UVA引起的HaCaT细胞凋亡的分子机制。方法实验分为5组：正常...目的复制UVA诱导的HaCaT细胞凋亡模型,研究UVA对细胞内c-jun和环氧合酶-2（cyclooxygenase-2,COX-2）的影响,从而探究扇贝多肽（Polypeptide from Chlamys far-reri,PCF）抑制UVA引起的HaCaT细胞凋亡的分子机制。方法实验分为5组：正常对照组、UVA模型组、UVA＋5.69mmol·L^-1PCF组、UVA＋2.84mmol·L^-1PCF组、UVA＋1.42mmol·L^-1PCF组。应用实时荧光定量PCR和蛋白印迹法检测细胞内c-jun的表达;RT-PCR结合蛋白质印迹法检测细胞内COX-2的表达;琼脂糖凝胶电泳分析PCF和COX-2特异性抑制剂celecoxib对UVA诱导HaCaT细胞凋亡的影响。结果预先加入PCF和celecoxib均可明显抑制8J·cm^-2UVA诱导的HaCaT细胞凋亡;UVA照射HaCaT细胞后COX-2mRNA及蛋白表达水平增加,与对照组相比差异有显著性（P〈0.01）;1.42-5.69mmol·L^-1剂量范围内的PCF可剂量依赖性抑制UVA引起的细胞内COX-2mR-NA及蛋白表达（P〈0.05,P〈0.01）;PCF也抑制了UVA引起的HaCaT细胞内c-jun表达的增加,且呈量效关系（P〈0.05,P〈0.01）。结论UVA诱导HaCaT细胞发生凋亡时,细胞内COX-2和c-jun的表达明显增加,PCF通过抑制细胞内COX-2和c-jun的表达而发挥其抗凋亡作用。展开更多
以人自发性永生化角质形成细胞系(Ha Ca T)细胞为材料,通过CCK8和蛋白印迹法分别测定不同剂量长波紫外线(ultraviolet A,UVA)、不同浓度丹参酮ⅡA(tanshinoneⅡA,TSⅡA),以及UVA和TSⅡA共同作用下的细胞活力和促分裂素原活化蛋白激酶(mi...以人自发性永生化角质形成细胞系(Ha Ca T)细胞为材料,通过CCK8和蛋白印迹法分别测定不同剂量长波紫外线(ultraviolet A,UVA)、不同浓度丹参酮ⅡA(tanshinoneⅡA,TSⅡA),以及UVA和TSⅡA共同作用下的细胞活力和促分裂素原活化蛋白激酶(mitogenactivated protein kinase,MAPK)信号通路蛋白(p38,JNK和Erk)磷酸化水平.结果表明:在10 J/cm2的UVA照射下,细胞活力为对照组的70%左右,在20 J/cm2的UVA照射下,细胞活力仅为对照组的55%左右;低浓度的TSⅡA在正常情况下对细胞活力无影响,高浓度(85μmol/L)TSⅡA处理组的细胞活力约为对照组的70%左右.与TSⅡA或UVA单独处理相比,二者共同作用下细胞活力大大降低且差异极其显著.UVA照射提高了MAPK信号通路中的p38和JNK磷酸化水平,但是对Erk磷酸化水平没有影响;而TSⅡA可以显著提高低辐射剂量(2 J/cm2)UVA诱导下的p38和JNK的磷酸化水平.这说明UVA促进Ha Ca T细胞凋亡是通过提高p38和JNK磷酸化水平来实现的;而TSⅡA可以提高p38和JNK磷酸化水平,进一步加速UVA诱导的Ha Ca T细胞凋亡.展开更多
The effects of photostabilizers of ultraviolet absorbers （UVA）, hindered amine light stabilizer （HALS） and pigment on surface color change and mechanical properties of weathered wood-flour/ polyethylene （HDPE） c...The effects of photostabilizers of ultraviolet absorbers （UVA）, hindered amine light stabilizer （HALS） and pigment on surface color change and mechanical properties of weathered wood-flour/ polyethylene （HDPE） composites were investigated. After being added UVA with high UV absorbance, the WPC exhibites better ability to resist color fading and mechanical property loss. High molecular weight HALS is found to be the most effective in controlling long term fading and yellowing changes. Pigments cover the composites for remaining the original color after weathering regardless of less contribution to mechanical property. Addition of photostabilizer and pigment together show great synergism in decreasing color fading and flexural property loss.展开更多
Ultraviolet radiation by its wavelength is divided into: UVA, UVB and UVC. Only UVA and UVB manage to penetrate the ozone layer, but due to anthropological activities, all of them are capable of interacting with human...Ultraviolet radiation by its wavelength is divided into: UVA, UVB and UVC. Only UVA and UVB manage to penetrate the ozone layer, but due to anthropological activities, all of them are capable of interacting with humans to a greater or lesser extent, and can generate adverse effects such as cellular stress when interacting with intra-and extracellular biomolecules. The skin is the first organ in contact with UV radiation, and the stress it generates can be analyzed by the expression of a bioindicator of cellular damage such as Hsp70. Therefore, the objective of the project was: to determine the effect of UVA, UVB and UVC radiation on HaCaT epithelial cells, by analyzing the expression of Hsp70. Materials and methods: HaCaT cells were cultured in vitro, which were irradiated with UVA, UVB and UVC light at different doses, to subsequently determine the degree of Hsp70 expression by Immunodetection by PAGE-SDS and Western Blot. Results: Basal expression of Hsp70 was observed in no irradiated HaCaT cells. When HaCaT cells were irradiated with UVA, UVB, UVC, an increase in this Hsp70 protein was observed. With UVA, a higher degree of expression was observed at a time of 30 minutes of irradiation. With UVB the highest expression shifted to a time of 20 minutes. With UVC, overexpression was observed after 10 minutes. Conclusion: UV radiation generates cellular stress on HaCaT cells, evaluated by the stress bioindicator Hsp70. According to the wavelength of UV radiation, those that have a shorter wavelength have a greater potential for cellular damage, such as UVC.展开更多
A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a...A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a coastal location and to characterize their properties and behaviors. Primary and secondary field observation methods were utilized in this data-centric study. Forensic engineering principles and methodologies guided the study. The challenges set forward were object detection, observation, and characterization, where multispectral electro-optical devices and radar were employed due to limited visual acuity and intermittent presentation of the phenomena. The primary means of detection utilized a 3 cm X-band radar operating in two scan geometries, the X- and Y-axis. Multispectral electro-optical devices were utilized as a secondary means of detection and identification. Data was emphasized using HF and LF detectors and spectrum analyzers incorporating EM, ultrasonic, magnetic, and RF field transducers to record spectral data in these domains. Data collection concentrated on characterizing VIS, NIR, SWIR, LWIR, UVA, UVB, UVC, and the higher energy spectral range of ionizing radiation (alpha, beta, gamma, and X-ray) recorded by Geiger-Müller counters as well as special purpose semiconductor diode sensors.展开更多
The purpose of the present study was to compare the effects of different doses of ultraviolet radiation A1 （UVA1） on human fibroblast proliferation and collagen level in a mouse model of scleroderma, so as to identi...The purpose of the present study was to compare the effects of different doses of ultraviolet radiation A1 （UVA1） on human fibroblast proliferation and collagen level in a mouse model of scleroderma, so as to identify appropriate irradiation doses for clinical treatment of scleroderma. Monolayer from human fibroblasts was cultured in vitro, and a mouse model of scleroderma was established by subcutaneous injection of 100 μL of 400 μg/mL bleomycin into the back of BALB/c mice for 4 weeks. The mouse models and human fibroblasts were divided into UVA1- exposed （100, 60 and 20 J/cm2） and UVA-unexposed groups. At 0, 24 and 48 h after exposure, cell proliferation and levels of hydroxyproline and collagen were detected. UVA1 irradiation was performed 3 times weekly for 10 weeks, and the pathological changes of skin tissues, skin thickness and collagen level were observed after phototherapy. Cell proliferation and the levels of hydroxyproline and collagen were inhibited after phototherapy, and there was a significant difference between the UVAl-exposed cells and UVAl-unexposed cells （P 〈 0.001）. In addition, UVA1 phototherapy improved dermal sclerosis and softened the skin, and there were significant differences between the high-dose UVA1 group and the model group, and the negative group （P 〈 0.05）. It is concluded that UVA1 radiation can reduce cell proliferation, and decrease hydroxyproline and collagen levels in a dose-dependent manner in vitro. High-dose UVA1 phototherapy has marked therapeutic effect on scleroderma in the mouse model. Decreased collagen level may be related to the reduced number and activity of cells, as well as inhibition of collagen synthesis.展开更多
文摘目的复制UVA诱导的HaCaT细胞凋亡模型,研究UVA对细胞内c-jun和环氧合酶-2（cyclooxygenase-2,COX-2）的影响,从而探究扇贝多肽（Polypeptide from Chlamys far-reri,PCF）抑制UVA引起的HaCaT细胞凋亡的分子机制。方法实验分为5组：正常对照组、UVA模型组、UVA＋5.69mmol·L^-1PCF组、UVA＋2.84mmol·L^-1PCF组、UVA＋1.42mmol·L^-1PCF组。应用实时荧光定量PCR和蛋白印迹法检测细胞内c-jun的表达;RT-PCR结合蛋白质印迹法检测细胞内COX-2的表达;琼脂糖凝胶电泳分析PCF和COX-2特异性抑制剂celecoxib对UVA诱导HaCaT细胞凋亡的影响。结果预先加入PCF和celecoxib均可明显抑制8J·cm^-2UVA诱导的HaCaT细胞凋亡;UVA照射HaCaT细胞后COX-2mRNA及蛋白表达水平增加,与对照组相比差异有显著性（P〈0.01）;1.42-5.69mmol·L^-1剂量范围内的PCF可剂量依赖性抑制UVA引起的细胞内COX-2mR-NA及蛋白表达（P〈0.05,P〈0.01）;PCF也抑制了UVA引起的HaCaT细胞内c-jun表达的增加,且呈量效关系（P〈0.05,P〈0.01）。结论UVA诱导HaCaT细胞发生凋亡时,细胞内COX-2和c-jun的表达明显增加,PCF通过抑制细胞内COX-2和c-jun的表达而发挥其抗凋亡作用。
文摘以人自发性永生化角质形成细胞系(Ha Ca T)细胞为材料,通过CCK8和蛋白印迹法分别测定不同剂量长波紫外线(ultraviolet A,UVA)、不同浓度丹参酮ⅡA(tanshinoneⅡA,TSⅡA),以及UVA和TSⅡA共同作用下的细胞活力和促分裂素原活化蛋白激酶(mitogenactivated protein kinase,MAPK)信号通路蛋白(p38,JNK和Erk)磷酸化水平.结果表明:在10 J/cm2的UVA照射下,细胞活力为对照组的70%左右,在20 J/cm2的UVA照射下,细胞活力仅为对照组的55%左右;低浓度的TSⅡA在正常情况下对细胞活力无影响,高浓度(85μmol/L)TSⅡA处理组的细胞活力约为对照组的70%左右.与TSⅡA或UVA单独处理相比,二者共同作用下细胞活力大大降低且差异极其显著.UVA照射提高了MAPK信号通路中的p38和JNK磷酸化水平,但是对Erk磷酸化水平没有影响;而TSⅡA可以显著提高低辐射剂量(2 J/cm2)UVA诱导下的p38和JNK的磷酸化水平.这说明UVA促进Ha Ca T细胞凋亡是通过提高p38和JNK磷酸化水平来实现的;而TSⅡA可以提高p38和JNK磷酸化水平,进一步加速UVA诱导的Ha Ca T细胞凋亡.
文摘The effects of photostabilizers of ultraviolet absorbers （UVA）, hindered amine light stabilizer （HALS） and pigment on surface color change and mechanical properties of weathered wood-flour/ polyethylene （HDPE） composites were investigated. After being added UVA with high UV absorbance, the WPC exhibites better ability to resist color fading and mechanical property loss. High molecular weight HALS is found to be the most effective in controlling long term fading and yellowing changes. Pigments cover the composites for remaining the original color after weathering regardless of less contribution to mechanical property. Addition of photostabilizer and pigment together show great synergism in decreasing color fading and flexural property loss.
文摘Ultraviolet radiation by its wavelength is divided into: UVA, UVB and UVC. Only UVA and UVB manage to penetrate the ozone layer, but due to anthropological activities, all of them are capable of interacting with humans to a greater or lesser extent, and can generate adverse effects such as cellular stress when interacting with intra-and extracellular biomolecules. The skin is the first organ in contact with UV radiation, and the stress it generates can be analyzed by the expression of a bioindicator of cellular damage such as Hsp70. Therefore, the objective of the project was: to determine the effect of UVA, UVB and UVC radiation on HaCaT epithelial cells, by analyzing the expression of Hsp70. Materials and methods: HaCaT cells were cultured in vitro, which were irradiated with UVA, UVB and UVC light at different doses, to subsequently determine the degree of Hsp70 expression by Immunodetection by PAGE-SDS and Western Blot. Results: Basal expression of Hsp70 was observed in no irradiated HaCaT cells. When HaCaT cells were irradiated with UVA, UVB, UVC, an increase in this Hsp70 protein was observed. With UVA, a higher degree of expression was observed at a time of 30 minutes of irradiation. With UVB the highest expression shifted to a time of 20 minutes. With UVC, overexpression was observed after 10 minutes. Conclusion: UV radiation generates cellular stress on HaCaT cells, evaluated by the stress bioindicator Hsp70. According to the wavelength of UV radiation, those that have a shorter wavelength have a greater potential for cellular damage, such as UVC.
文摘A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a coastal location and to characterize their properties and behaviors. Primary and secondary field observation methods were utilized in this data-centric study. Forensic engineering principles and methodologies guided the study. The challenges set forward were object detection, observation, and characterization, where multispectral electro-optical devices and radar were employed due to limited visual acuity and intermittent presentation of the phenomena. The primary means of detection utilized a 3 cm X-band radar operating in two scan geometries, the X- and Y-axis. Multispectral electro-optical devices were utilized as a secondary means of detection and identification. Data was emphasized using HF and LF detectors and spectrum analyzers incorporating EM, ultrasonic, magnetic, and RF field transducers to record spectral data in these domains. Data collection concentrated on characterizing VIS, NIR, SWIR, LWIR, UVA, UVB, UVC, and the higher energy spectral range of ionizing radiation (alpha, beta, gamma, and X-ray) recorded by Geiger-Müller counters as well as special purpose semiconductor diode sensors.
文摘The purpose of the present study was to compare the effects of different doses of ultraviolet radiation A1 （UVA1） on human fibroblast proliferation and collagen level in a mouse model of scleroderma, so as to identify appropriate irradiation doses for clinical treatment of scleroderma. Monolayer from human fibroblasts was cultured in vitro, and a mouse model of scleroderma was established by subcutaneous injection of 100 μL of 400 μg/mL bleomycin into the back of BALB/c mice for 4 weeks. The mouse models and human fibroblasts were divided into UVA1- exposed （100, 60 and 20 J/cm2） and UVA-unexposed groups. At 0, 24 and 48 h after exposure, cell proliferation and levels of hydroxyproline and collagen were detected. UVA1 irradiation was performed 3 times weekly for 10 weeks, and the pathological changes of skin tissues, skin thickness and collagen level were observed after phototherapy. Cell proliferation and the levels of hydroxyproline and collagen were inhibited after phototherapy, and there was a significant difference between the UVAl-exposed cells and UVAl-unexposed cells （P 〈 0.001）. In addition, UVA1 phototherapy improved dermal sclerosis and softened the skin, and there were significant differences between the high-dose UVA1 group and the model group, and the negative group （P 〈 0.05）. It is concluded that UVA1 radiation can reduce cell proliferation, and decrease hydroxyproline and collagen levels in a dose-dependent manner in vitro. High-dose UVA1 phototherapy has marked therapeutic effect on scleroderma in the mouse model. Decreased collagen level may be related to the reduced number and activity of cells, as well as inhibition of collagen synthesis.
