小鼠注射α-促黑素对翠绿宝石激光脱毛的影响

Effects of Subentaneous Injection ofα-MSH on Alexandrite Laser Hair Removal in a Mouse Model

目的探讨在毛发生长期局部注射α-促黑素(α-MSH),再行翠绿宝石激光照射,观察激光脱毛后的疗效及副反应。方法用C57BL6小鼠建立动物模型,将60只小鼠随机分成A、B、C、D4组,用蜡/松香混和物脱毛,诱导毛发从休止期进入生长期,其中A组、B组为实验组,分别用α-促黑素0.5mg/kg、0.25mg/kg每天于背部分点均匀注射,C组、D组为对照组,C组用生理盐水等量注射,D组不做任何处理。在毛发生长期Ⅳ亚期,A、B、C3组小鼠背部行翠绿宝石激光照射,于术前、术后0.5h、2d、28d分别取材,术前及术后28d组织用F-M染色,术后组织用HE染色,术后观察皮肤反应,术后28d观察脱毛疗效。结果术前毛囊黑素平均灰度值实验组高于对照组,术后毛囊损伤程度、术后皮肤副反应及术后28d脱毛疗效实验组较对照组强,术后28d实验组色素沉着明显,3组均未见有瘢痕形成。结论激光脱毛术前在C57BL6小鼠毛发处于生长期时外用α-促黑素,促使毛发进一步变黑,可以增加激光脱毛疗效,但术后副反应及色素沉着也增加。

Objective To study the result of Alexandrite laser hair removal after subcutaneous in-jection ofα-MSH in anagen-induced C57BL6mice.Methods Hair shafts were depilated by wax/resin mix-ture to induce hair follicles from telogen to anagen in60C57BL6mice.The mice were randomly divided in-to groups A,B,C and D.Groups A and B were injected with0.5mg/kg and0.25mg/kg ofα-MSH,respec-tively,on the back skin subcutaneously once a day.Group C was injected with the same dose of normal saline.Group D was treated as blank control.Groups A,B and C were exposed to Alexandrite laser on ana-gen(substageⅣ).Biopsies were taken before treatment and0.5h,2and28days after treatment.Speci-mens were stained with Masson-Fontana method before treatment,and with haematoxylin and eosin after treatment.The cutaneous response was observed after laser hair removal.Hair regrowth was assessed28days after treatment.Results The mean gradation value of folliclar melanin was increased in the test groups than that in control group before laser hair removal.Extent of folliclar damage and cutaneous adverse reaction af-ter laser treatment was more severe in test groups than those in control group.Hair regrowth was less obvious in test groups than that in control group,while local hyperpigmentation was increased in test groups than that in control group28days after treatment.No scarring was observed in3groups.Conclusion Subentaneous injection ofα-MSH could increase melanin of the hair,decrease hair regrowth,and enhance local pigmenta-tion after laser hair removal in anagen-induced C57BL6mice.