The ever-changing microenvironment of Staphylococcus aureus in cutaneous infections  

作　　者：Zhenru Zhou Jing Tian Shi Li Liyue Fei Min Dai Nana Long 

机构地区：[1]Sichuan Provincial Engineering Laboratory for Prevention and Control Technology of Veterinary Drug Residue in Animal-Origin Food,Chengdu Medical College,Chengdu,PR China [2]School of Laboratory Medicine,Chengdu Medical College,Chengdu,PR China

出　　处：《Animal Models and Experimental Medicine》2024年第5期707-716,共10页动物模型与实验医学（英文）

基　　金：financially supported by the National Natural Science Foundation of China(31970137);Sichuan Provincial Administration of Traditional Chinese Medicine Innovation Team Project(2023ZD02);the Scientific Research Fund of Chengdu Medical College(CYZ15-02);the olid-state Fermentation Resource Utilization Key Laboratory of Sichuan Province(2022GTZD02);Natural Science Youth Fund of Science and Technology Department of Sichuan Province(2022NSFSC1760);Sichuan Province College Students Innovation and Entrepreneurship Project(S202113705068,S202213705053)。

摘　　要：Background:Staphylococcus aureus is responsible for the majority of skin and soft tissue infections,which are often diagnosed at a late stage,thereby impacting treatment efficacy.Our study was designed to reveal the physiological changes at different stages of infection by S.aureus through the combined analysis of variations in the skin microenvironment,providing insights for the diagnosis and treatment of S.aureus infections.Methods:We established a murine model of skin and soft tissue infection with S.aureus as the infectious agent to investigate the differences in the microenvironment at different stages of infection.By combining analysis of the host immune status and histological observations,we elucidate the progression of S.aureus infection in mice.Results:The results indicate that the infection process in mice can be divided into at least two stages:early infection(1–3 days post-i nfection)and late infection(5–7 days post-i nfection).During the early stage of infection,notable symptoms such as erythema and abundant exudate at the infection site were observed.Histological examination revealed infiltration of numerous neutrophils and bacterial clusters,accompanied by elevated levels of cytokines(IL-6,IL-10).There was a decrease in microbial alpha diversity within the microenvironment(Shannon,Faith's PD,Chao1,Observed species,Simpson,Pielou's E).In contrast,during the late stage of infection,a reduction or even absence of exudate was observed at the infected site,accompanied by the formation of scabs.Additionally,there was evidence of fibroblast proliferation and neovascularization.The levels of cytokines and microbial composition gradually returned to a healthy state.Conclusion:This study reveals synchrony between microbial composition and histological/immunological changes during S.aureus-i nduced SSTIs.

关 键 词：microbial composition skin and soft tissue infection Staphylococcus aureus 

分 类 号：R756[医药卫生—皮肤病学与性病学]