Objective Tissue uptake and distribution of nano-/microplastics was studied at a single high dose by gavage in vivo.Methods Fluorescent microspheres(100 nm,3μm,and 10μm)were given once at a dose of 200 mg/(kg∙body w...Objective Tissue uptake and distribution of nano-/microplastics was studied at a single high dose by gavage in vivo.Methods Fluorescent microspheres(100 nm,3μm,and 10μm)were given once at a dose of 200 mg/(kg∙body weight).The fluorescence intensity(FI)in observed organs was measured using the IVIS Spectrum at 0.5,1,2,and 4 h after administration.Histopathology was performed to corroborate these findings.Results In the 100 nm group,the FI of the stomach and small intestine were highest at 0.5 h,and the FI of the large intestine,excrement,lung,kidney,liver,and skeletal muscles were highest at 4 h compared with the control group(P<0.05).In the 3μm group,the FI only increased in the lung at 2 h(P<0.05).In the 10μm group,the FI increased in the large intestine and excrement at 2 h,and in the kidney at 4 h(P<0.05).The presence of nano-/microplastics in tissues was further verified by histopathology.The peak time of nanoplastic absorption in blood was confirmed.Conclusion Nanoplastics translocated rapidly to observed organs/tissues through blood circulation;however,only small amounts of MPs could penetrate the organs.展开更多
Objective This study was designed to provide the evidences on the toxicokinetics of microplastics(MPs)and nanoplastics(NPs)in the bodies of mammals.Methods 100 nm,3μm,and 10μm fluorescent polystyrene(PS)beads were a...Objective This study was designed to provide the evidences on the toxicokinetics of microplastics(MPs)and nanoplastics(NPs)in the bodies of mammals.Methods 100 nm,3μm,and 10μm fluorescent polystyrene(PS)beads were administered to mice once by gavage at a dose of 200 mg/kg body weight.The levels and change of fluorescence intensity in samples of blood,subcutaneous fat,perirenal fat,peritesticular fat,cerebrum,cerebellum,testis,and epididymis were measured at 0.5,1,2,and 4 h after administration using an IVIS Spectrum small-animal imaging system.Histological examination,confocal laser scanning,and transmission electron microscope were performed to corroborate the findings.Results After confirming fluorescent dye leaching and impact of pH value,increased levels of fluorescence intensity in blood,all adipose tissues examined,cerebrum,cerebellum,and testis were measured in the 100 nm group,but not in the 3 and 10μm groups except in the cerebellum and testis at 4 h for the 3μm PS beads.The presence of PS beads was further corroborated.Conclusion After a single oral exposure,NPs are absorbed rapidly in the blood,accumulate in adipose tissues,and penetrate the blood-brain/testis barriers.As expected,the toxicokinetics of MPs is significantly size-dependent in mammals.展开更多
目的:评价氨甲环酸单纯外用和联合射频治疗仪舒敏之星导入在改善面部黄褐斑方面的有效性和安全性。方法:本研究为单中心、自身面部左右随机对照研究,符合纳排标准并签署知情同意书的33名受试者于双侧面颊外用3%氨甲环酸精华液,抽签随机...目的:评价氨甲环酸单纯外用和联合射频治疗仪舒敏之星导入在改善面部黄褐斑方面的有效性和安全性。方法:本研究为单中心、自身面部左右随机对照研究,符合纳排标准并签署知情同意书的33名受试者于双侧面颊外用3%氨甲环酸精华液,抽签随机选取一侧面颊为试验侧,另一为对照侧;试验侧使用舒敏之星导入5%氨甲环酸精萃液,每周1次、共12次。在0、14、28、56和84 d进行随访,采集面部皮肤检测仪(VISIA)和皮肤色素分析仪(Antera 3D)照片,黄褐斑面积及严重程度(MASI)评分评价黄褐斑严重程度,检测皮肤颜色、经皮水分丢失(TEWL)等生理指标和受试者主观评价,收集研究期间所有的不良反应。采用重复测量方差分析、配对t检验和非参数检验进行统计分析。结果:外用氨甲环酸精华液联合舒敏之星导入氨甲环酸精萃液和外用氨甲环酸精华液都可以显著改善黄褐斑皮损,28 d MASI评分降低相较基线差异具有统计学意义,84 d随访结束时MASI评分分别下降0.86、0.70,联合舒敏之星导入5%氨甲环酸精萃液侧优于单纯外用3%氨甲环酸精华液,但两侧差异无统计学意义(P>0.05),联合导入在改善黄褐斑皮损部位L值方面更有效,56、84 d较基线差异有统计学意义(P<0.05),对于正常肤色也有一定改善。联合导入还可以改善皮肤屏障功能,降低TEWL值(P<0.05)。试验侧80.7%和对照侧67.7%的受试者认为黄褐斑颜色变淡、面积缩小,两侧之间差异无统计学意义(P>0.05),受试者整体满意度好,试验期间未见不良反应。结论:氨甲环酸外用可以降低MASI评分改善黄褐斑,联合舒敏之星导入氨甲环酸精萃液疗效更好,表现为84 d MASI评分降低更明显,皮损部位L值升高,联合导入不仅可以提高氨甲环酸的效果,还可以改善皮肤屏障功能,降低TEWL值。展开更多
基金supported by National Natural Science Foundation of China[grant number U21A20399]Liaoning Revitalization Talents Program[grant number XLYC1802059]+2 种基金the Key R&D Program of Liaoning Province[grant number2019JH2/10300044]the Key Laboratory Program of Liaoning Province[grant number 2018225113]the Key Laboratory Program of Shenyang City[grant number 21-103-0-16]。
文摘Objective Tissue uptake and distribution of nano-/microplastics was studied at a single high dose by gavage in vivo.Methods Fluorescent microspheres(100 nm,3μm,and 10μm)were given once at a dose of 200 mg/(kg∙body weight).The fluorescence intensity(FI)in observed organs was measured using the IVIS Spectrum at 0.5,1,2,and 4 h after administration.Histopathology was performed to corroborate these findings.Results In the 100 nm group,the FI of the stomach and small intestine were highest at 0.5 h,and the FI of the large intestine,excrement,lung,kidney,liver,and skeletal muscles were highest at 4 h compared with the control group(P<0.05).In the 3μm group,the FI only increased in the lung at 2 h(P<0.05).In the 10μm group,the FI increased in the large intestine and excrement at 2 h,and in the kidney at 4 h(P<0.05).The presence of nano-/microplastics in tissues was further verified by histopathology.The peak time of nanoplastic absorption in blood was confirmed.Conclusion Nanoplastics translocated rapidly to observed organs/tissues through blood circulation;however,only small amounts of MPs could penetrate the organs.
基金supported by National Natural Science Foundation of China[grand number U21A20399]Liaoning Revitalization Talents Program[grant number XLYC1802059]+1 种基金the Key R&D Program of Liaoning Province[grant number 2019JH2/10300044]Key Laboratory Program of Liaoning Province[grant number 2018225113]。
文摘Objective This study was designed to provide the evidences on the toxicokinetics of microplastics(MPs)and nanoplastics(NPs)in the bodies of mammals.Methods 100 nm,3μm,and 10μm fluorescent polystyrene(PS)beads were administered to mice once by gavage at a dose of 200 mg/kg body weight.The levels and change of fluorescence intensity in samples of blood,subcutaneous fat,perirenal fat,peritesticular fat,cerebrum,cerebellum,testis,and epididymis were measured at 0.5,1,2,and 4 h after administration using an IVIS Spectrum small-animal imaging system.Histological examination,confocal laser scanning,and transmission electron microscope were performed to corroborate the findings.Results After confirming fluorescent dye leaching and impact of pH value,increased levels of fluorescence intensity in blood,all adipose tissues examined,cerebrum,cerebellum,and testis were measured in the 100 nm group,but not in the 3 and 10μm groups except in the cerebellum and testis at 4 h for the 3μm PS beads.The presence of PS beads was further corroborated.Conclusion After a single oral exposure,NPs are absorbed rapidly in the blood,accumulate in adipose tissues,and penetrate the blood-brain/testis barriers.As expected,the toxicokinetics of MPs is significantly size-dependent in mammals.
文摘目的:评价氨甲环酸单纯外用和联合射频治疗仪舒敏之星导入在改善面部黄褐斑方面的有效性和安全性。方法:本研究为单中心、自身面部左右随机对照研究,符合纳排标准并签署知情同意书的33名受试者于双侧面颊外用3%氨甲环酸精华液,抽签随机选取一侧面颊为试验侧,另一为对照侧;试验侧使用舒敏之星导入5%氨甲环酸精萃液,每周1次、共12次。在0、14、28、56和84 d进行随访,采集面部皮肤检测仪(VISIA)和皮肤色素分析仪(Antera 3D)照片,黄褐斑面积及严重程度(MASI)评分评价黄褐斑严重程度,检测皮肤颜色、经皮水分丢失(TEWL)等生理指标和受试者主观评价,收集研究期间所有的不良反应。采用重复测量方差分析、配对t检验和非参数检验进行统计分析。结果:外用氨甲环酸精华液联合舒敏之星导入氨甲环酸精萃液和外用氨甲环酸精华液都可以显著改善黄褐斑皮损,28 d MASI评分降低相较基线差异具有统计学意义,84 d随访结束时MASI评分分别下降0.86、0.70,联合舒敏之星导入5%氨甲环酸精萃液侧优于单纯外用3%氨甲环酸精华液,但两侧差异无统计学意义(P>0.05),联合导入在改善黄褐斑皮损部位L值方面更有效,56、84 d较基线差异有统计学意义(P<0.05),对于正常肤色也有一定改善。联合导入还可以改善皮肤屏障功能,降低TEWL值(P<0.05)。试验侧80.7%和对照侧67.7%的受试者认为黄褐斑颜色变淡、面积缩小,两侧之间差异无统计学意义(P>0.05),受试者整体满意度好,试验期间未见不良反应。结论:氨甲环酸外用可以降低MASI评分改善黄褐斑,联合舒敏之星导入氨甲环酸精萃液疗效更好,表现为84 d MASI评分降低更明显,皮损部位L值升高,联合导入不仅可以提高氨甲环酸的效果,还可以改善皮肤屏障功能,降低TEWL值。
