Abstract
Psoriasis is considered as a common chronic and relapsing inflammatory skin disease. MicroRNAs (miRNAs) were found to be related with psoriasis pathogenesis. Nevertheless, the function of miR-617 in psoriasis is still unclear. The miR-617 RNA level was detected using quantitative reverse transcription-PCR (qRT-PCR). Western blot analysis examined the protein level. Cell proliferation was analyzed via cell counting kit-8 (CCK-8) assay. Flow cytometry analysis detected cell cycle and apoptosis. The relationship between miR-617 and forkhead box protein O4 (FOXO4) was confirmed through dual luciferase assay. The miR-617 was up-regulated in psoriatic skin tissues and interleukin-22 (IL-22)-stimulated immortalized human keratinocyte HaCaT cells. Moreover, miR-617 mimics promoted proliferation, cell cycle, and suppressed apoptosis in IL-22-stimulated HaCaT cells. However, miR-617 inhibitor showed opposite effects. Additionally, FOXO4 was a target of miR-617. FOXO4 was down-regulated in psoriatic skin tissues and IL-22-stimulated HaCaT cells. Negative correlation between miR-617 and FOXO4 was identified. FOXO4 overexpression alleviated the effects of miR-617 proliferation, cell cycle and apoptosis in the IL-22-stimulated HaCaT cells. These results demonstrate that miR-617 increases the growth of IL-22-stimulated keratinocytes through targeting FOXO4, which provides a new therapeutic target for psoriasis.
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This work was supported by Scientific research fund support program of Southwest Medical University of Sichuan Province.
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TL conceived and designed the experiments, XMF analyzed and interpreted the results of the experiments, YML performed the experiments.
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10528_2020_9997_MOESM1_ESM.jpg
Fig.S1. (A) IL-22R expression was measured in the IL-22-stimulated HaCaT cells (n=3) using qRT-PCR. (B) Western blot analysis was performed to confirm the p27 protein level. n=3. **, p<0.01. (364 kB)
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Liu, T., Feng, X. & Liao, Y. miR-617 Promotes the Growth of IL-22-Stimulated Keratinocytes Through Regulating FOXO4 Expression. Biochem Genet 59, 547–559 (2021). https://doi.org/10.1007/s10528-020-09997-4
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DOI: https://doi.org/10.1007/s10528-020-09997-4