脂质体鬼臼毒素混悬液在大鼠表皮及真皮的分布规律初探

Epidermal and Dermal Distribution After Topical Application of Liposome Podophyllotoxin Suspen-sion in Rats

目的探讨脂质体鬼臼毒素在大鼠皮肤各层的分布规律。方法观察组大鼠涂抹0.5%脂质体鬼臼毒素混悬液,对照组涂抹0.5%鬼臼毒素酊剂,分别在涂药1、2、4、6、12及24h取皮肤标本,常规石蜡切片,采用激光共聚焦显微成像仪(CLSM)扫描,观察单位面积鬼臼毒素的荧光量。结果鬼臼毒素24h荧光值曲线下面积(AUC),表皮层中观察组是对照组的1.5倍,真皮层中是2.3倍;对照组在涂药2h后,表皮和真皮的荧光量即达到峰值(分别为1585.52/μm2和2005.66/μm2),在4h后荧光量迅速降低;而观察组在4h前,表皮和真皮中的荧光量较低,6h后逐渐增高,在12h达峰值(分别为(750.28/μm2和1073.08/μm2)。结论脂质体制剂使鬼臼毒素在皮肤中缓慢释放,并持续较长时间。

Objective To study the distribution pattern of liposome podophyllotoxin(LP)in rat skin.Methods The rats were divided into two groups:0.5%liposome podophyllotoxin suspension was ap-plied to LP group,0.5%podophyllotoxin tincture was applied to control group.The skin specimens were ob-tained1?2?4?6?12and24h after drug application,the amount of fluorescent stain was observed under con-focal laser scanning microscope and converted to the values of area under the curve(AUC).Results The epidermal AUC of fluorescent amount in LP group was1.5-fold than that in control group,dermal AUC was2.3-fold higher.The unit area fluorescent amount in both epidermis and dermis was highest2hours after topical medication in control group(1585.52/μm 2 and2005.66μm 2 ),and quickly reduced after4hours.But the epidermal and dermal unit area fluorescent amount in LP group was rather low in4hours after topi-cal medication,and gradually increased after6hours,and peaked after12hours(750.28/μm 2 and1073.08/μm 2 ).Conclusion Liposome preparation of podophyllotoxin can be slowly released and lasts longer in the skin.