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MiR-449a attenuates autophagy of T-cell lymphoma cells by downregulating ATG4B expression.


ABSTRACT: Increasing evidence suggests the role of miR-449a in the regulation of tumorigenesis and autophagy. Autophagy plays an important role in the malignancy of T-cell lymphoma. However, it is still unknown whether miR-449a is associated with autophagy to regulate the malignancy of T-cell lymp homa. In this study, we for the first time demonstrated that miR-449a enhanced apoptosis of T-cell lymphoma cells by decreasing the degree of autophagy. Further, miR-449a downregulated autophagy-associated 4B (ATG4B) expression, which subsequently reduced the autophagy of T-cell lymphoma cells. Mechanistically, miR-449a decreased ATG4B protein level by binding to its mRNA 3'UTR, thus reducing the mRNA stability. In addition, studies with nude mice showed that miR-449a significantly inhibited lymphoma characteristics in vivo. In conclusion, our results demonstrated that the "miR-449a/ATG4B/autophagy" pathway played a vital role in the malignancy of T-cell lymphoma, suggesting a novel therapeutic target. [BMB Reports 2020; 53(5): 254-259].

SUBMITTER: Zhang N 

PROVIDER: S-EPMC7262515 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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MiR-449a attenuates autophagy of T-cell lymphoma cells by downregulating ATG4B expression.

Zhang Nan N   Qiu Ling L   Li Tao T   Wang Xiao X   Deng Rui R   Yi Hai H   Su Yi Y   Fan Fang-Yi FY  

BMB reports 20200501 5


Increasing evidence suggests the role of miR-449a in the regulation of tumorigenesis and autophagy. Autophagy plays an important role in the malignancy of T-cell lymphoma. However, it is still unknown whether miR-449a is associated with autophagy to regulate the malignancy of T-cell lymp homa. In this study, we for the first time demonstrated that miR-449a enhanced apoptosis of T-cell lymphoma cells by decreasing the degree of autophagy. Further, miR-449a downregulated autophagy-associated 4B (A  ...[more]

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