自体全厚皮片内角朊细胞组织学改变及对移植物过度色素沉着的影响

HISTOLOGICAL CHANGE OF KERATINOCYTE IN FULL THICKNESS SKIN AUTOGRAFT AND ITS EFFECT ON HYPERPIGMENTATION OF THE GRAFT

为了观察全厚皮片移植对过度色素沉着的影响，用豚鼠作实验对象，采用组织学、组织化学及放射自显影技术，观察豚鼠表皮内角朊细胞的密度、角朊细胞内黑色素颗粒的数量及分布形式的变化。结果表明，角朊细胞的组织学改变实际上是一个损伤后修复的过程；角朊细胞内黑色素含量增加及出现的多层次的“核上帽”状分布而形成的“多重帘幕”效应，是皮片过度色素化的直接原因；黑色素在角朊细胞内的降解障碍及角朊细胞更新周期延长可能是表皮内黑色素含量增多的重要原因。

To understand the reason of hyperpigmentation following full thickness skin autograft, 54 guinea pigs were selected as skin autograft models. The changes of density of epidermal keratinocyte (KC) and the amount and distribution of melanin in the epidermal KC were observed by histological, histochemical and autoradiographic techniques. The results showed: (1) The histological changes of KC were in fact a wound repair process; (2) The increased melanin in KC coordinated with "multi overlapping screen" effect, a result of multiple layers of "supranuclear cap", was the direct cause of hyperpigmentation of the graft and (3) The hydrolytic disturbance of melanin in KC and the longer life span of the KC were probably the important reasons for the increase of melanin in the epidermis.