The anatomy of the skin of the Chinese tree shrew is very similar to that of human skin

DEAR EDITOR,The Chinese tree shrew(Tupaia belangeri chinensis)is a small mammal closely related to primates.It has a small body size,low maintenance cost,and a relatively short reproductive cycle,all of which has made it the ideal model for the study of a variety of human diseases.In this study,we compared the anatomy of the skin of the Chinese tree shrew with that of the rhesus macaque,mouse and human,with the intention of providing the basic data required for the creation of skin disease models using this animal.Paraffin sections,hematoxylin-eosin(H&E)staining,masson staining and immunohistochemical techniques were used to examine the dorsal skin structure of the Chinese tree shrew.The epidermis was shown to be composed of 1–2 layers of cells.There were hair follicles,sebaceous glands and sweat glands in the dermis and the subcutaneous tissue,with apocrine glands being more common than eccrine glands.Both Keratin5(KRT5)and Keratin10(KRT10)were expressed in the skin of the Chinese tree shrew,with a localization in the cytoplasm.Overall,the skin morphology and histology of the Chinese tree shrew was basically the same as that of the human.We propose that the Chinese tree shrew has a strong potential to be used for creating animal models to help elucidate the molecular mechanisms underlying a variety of skin diseases.