Study on the Mechanism of miR-34a Affecting the Proliferation, Migration, and Invasion of Human Keloid Fibroblasts by Regulating the Expression of SATB1

OBJECTIVES: To explore the effect and mechanism of miR-34a on the proliferation, migration, and invasion of keloid fibroblasts (KFB). METHODS: Isolate and culture KFB and normal skin fibroblast (NFB), detect the mRNA expression levels of miR-34a and integrin β5 (SATB1) in KFB and NFB by RT-qPCR, and detect SATB1 by western blot. The level of protein expression, MTT method, Transwell method, RT-qPCR, and western blot were used to detect the effects of overexpression of miR-34a or inhibition of SATB1 expression on the proliferation, migration, and invasion of KFB cells and the expression of related proteins. The dual luciferase reporter gene test verifies the targeting relationship between miR-34a and SATB1. RESULTS: Compared with NFB, the expression of miR-34a was downregulated in KFB and the mRNA and protein expression levels of SATB1 were upregulated. Overexpression of miR-34a or inhibition of SATB1 expression inhibited the proliferation, migration, and invasion of KFB. miR-34a can negatively regulate the expression of SATB1, and overexpression of SATB1 reverses the effects of overexpression of miR-34a on the proliferation, migration, and invasion of KFB. CONCLUSIONS: miR-34a inhibits the proliferation, migration, and invasion of keloid fibroblasts by downregulating the expression of SATB1.