期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/ijms232415601
关键词
microRNA-200c; MECs; sheep; mammary gland; lactation
资金
- Yong Supervisor Support Fund of Gansu Agricultural University
- National Natural Science Foundation of China
- Discipline Team Project of Gansu Agricultural University
- Innovation Fund of Gansu Universities
- fund for Basic Research Creative Groups of Gansu Province
- [GAU-QDFC-2020-01]
- [32060746]
- [GAU-XKTD-2022-21]
- [2022A-059]
- [22JR5RA829]
miR-200c promotes the synthesis of triglycerides in ovine MECs by targeting PANK3, and its overexpression inhibits MECs proliferation.
Milk fat is the foremost nutrient of milk and a vital indicator in evaluating milk quality. Accumulating evidence suggests that microRNAs (miRNAs) are involved in the synthesis of milk fat. The miR-200c is closely related to lipid metabolism, but little is known about its effect on the synthesis of milk fat in MECs of ewes. Herein, the effect of miR-200c on the proliferation of ovine mammary epithelial cells (MECs) and its target relationship with a predicted target gene were investigated. The regulatory effects of miR-200c on the expression of the target genes and the content of triglycerides in ovine MECs were further analyzed. The results revealed that the expression level of miR-200c was differentially expressed in both eight tissues selected during lactation and in mammary gland tissues at different physiological periods. Overexpression of miR-200c inhibited the viability and proliferation of ovine MECs, while inhibition of miR-200c increased cell viability and promoted the proliferation of ovine MECs. Target gene prediction results indicated that miR-200c would bind the 3 ' UTR region of pantothenate kinase 3 (PANK3). Overexpression of miR-200c reduced the luciferase activity of PANK3, while inhibition of miR-200c increased its luciferase activity. These findings illustrated that miR-200c could directly interact with the target site of the PANK3. It was further found that overexpression of miR-200c reduced the expression levels of PANK3 and, thus, accelerated the synthesis of triglycerides. In contrary, the inhibitor of miR-200c promoted the expression of PANK3 that, thus, inhibited the synthesis of triglycerides in ovine MECs. Together, these findings revealed that miR-200c promotes the triglycerides synthesis in ovine MECs via increasing the lipid synthesis related genes expression by targeting PANK3.
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