Introduction As a kind of human unique benign skin tumour, keloid has caused great trouble to the physical and mental health of patients and is unfavourable for beautiful. The abnormal proliferation of fibroblasts is one of the main causes of keloid formation. TET2 (Ten eleven translocation 2) catalyzes the oxidation of cytosine 5mC to 5hmC which process plays important role in cell proliferation. However, the molecular mechanism of TET2 in keloids is not well-researched. Methods qPCR was used to detect the mRNA levels and Western blot was used to detect the protein level. DNA Dot blot was used to detect the level of 5hmC. CCK8 was used to examine the cell proliferation rate. EDU/DAPI staining was used to evaluate the living cells’ proliferation rate. DNA IP and PCR were used to detect the accumulation of DNA at the target site after 5hmC enrichment. Results We found that TET2 was highly expressed in keloid tissue. Interestingly, TET2 expression was increased in fibroblasts that were isolated and cultured in vitro compared to the tissue of origin. Knocking down TET2 expression can effectively decrease the modification level of 5hmC and inhibit the proliferation of fibroblasts. Notably, overexpression of DNMT3A inhibited fibroblast proliferation by decreasing 5hmC. The 5hmC-IP assay showed that TET2 could affect the expression of TGFβ by regulating the 5hmC modification level in the promoter region. And by this way, TET2 regulates the proliferation of fibroblasts. Conclusion This study found new epigenetic mechanisms for keloid formation.
Background Long non-coding RNAs (lncRNAs) play an important role in the occurrence of melanoma. However, the specific molecular mechanisms that regulate its biological function are still poorly understood. Therefore, the main purpose of this study is to elucidate the internal mechanism of lncRNA-FENDRR as a biological marker for the occurrence of SKCM and its influence on its proliferation. Results FENDRR is low expressed in skin cutaneous melanoma (SKCM) tissues and appears to be at an even lower level as the tumor progresses. However, the high expression of FENDRR can affect the proliferation of SKCM cell line A375. The results of flow cytometry showed that after overexpression of FENDRR, the cell cycle was arrested in the G1/G0 phase. Bioinformatics analysis and RIP results showed that FENDRR could be combined with YTHDF1. Together, these complexes regulate c-Myc mRNA level and determine cell proliferation. Conclusion We found that overexpression of FENDRR can effectively inhibit SKCM, which provides a new theoretical basis for new therapeutic approaches and targeted RNA drugs.
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