MicroRNA-98 inhibits the cell proliferation of human hypertrophic scar fibroblasts via targeting Col1A1

BACKGROUND: Hypertrophic scarring (HS) is a severe disease, and results from unusual wound healing. Col1A1 could promote the hypertrophic scar formation, and the expression of Col1A1 in HS tissue was markedly higher than that in the normal. In present study, we aimed to identify miRNAs as post-transcriptional regulators of Col1A1 in HS. METHODS: MicroRNA-98 was selected as the key miRNA comprised in HS. The mRNA levels of miR-98 in HS tissues and the matched normal skin tissues were determined by qRT-PCR. MTT and flow cytometry were used to determine the influence of miR-98 on cell proliferation and apoptosis of HSFBs, respectively. Col1A1 was found to be the target gene of miR-98 using luciferase reporter assay. Luciferase assay was performed to determine the relative luciferase activity in mimic NC, miR-98 mimic, inhibitor NC and miR-98 inhibitor with Col1A13'-UTR wt or Col1A13'-UTR mt reporter plasmids. The protein expression of Col1A1 in HSFBs after transfection with mimic NC, miR-98 mimic, inhibitor NC and miR-98 inhibitor were determined by western blotting. RESULTS: The mRNA level of miR-98 in HS tissues was much lower than that in the control. Transfection of HSFBs with a miR-98 mimic reduced the cell viability of HSFBs and increased the apoptosis portion of HSFBs, while inhibition of miR-98 increased cell viability and decreased apoptosis portion of HSFBs. miR-98 inhibitor increased the relative luciferase activity significantly when cotransfected with the Col1A1-UTR reporter plasmid, while the mutant reporter plasmid abolished the miR-98 inhibitor-mediated increase in luciferase activity. Western blotting revealed that overex-pression of miR-98 decreased the expression of Col1A1. CONCLUSIONS: Overexpression of miR-98 repressed the proliferation of HSFBs by targeting Col1A1.

Comparison between topical tacrolimus and potent topical steroids in treatment of childhood vitiligo / 重庆医学

Objective To assess which of topical tacrolimus and topical highly potent steroids,is more effective and safer in the treatment of pediatric vitiligo.Methods The PubMed,Cochrane library,Scopus and CINAHL plus databases were retrieved.The search was confined to English language articles.The randomized controlled trial(RCT) articles were included in our study.The quality of the identified articles was examined by using the CASP Randomised Controlled Trials Checklist.Results As a result,there were only a few studies related to the comparison.However,there were only two RCTs regarding a comparison of topical tacrolimus 0.1％ and clobetasol propionate 0.05 ％ in childhood vitiligo.Conclusion When the body surface area (BSA) involved in the child is ＜20 ％,and the disease is not rapidly spreading,topical therapy is the first choice.Topical tacrolimus may be considered as an alternative therapy for childhood vitiligo,especially for acrofacial and segmental types,before considering other modalities,but still need to observe long-term side effects.