期刊
PLOS ONE
卷 6, 期 8, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0023238
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- MEXT [18GS0317, 22590981]
- Program for Promotion of Basic and Applied Research for Innovations in Bio-oriented Industry (BRAIN)
- Grants-in-Aid for Scientific Research [22590981, 18GS0317, 22790861, 23300274, 22790863, 21249057] Funding Source: KAKEN
Aim: We previously found that chronic tuberous sclerosis protein 2 (TSC2) deletion induces activation of mammalian target of rapamycin Complex 1 (mTORC1) and leads to hypertrophy of pancreatic beta cells from pancreatic beta cell-specific TSC2 knockout (beta TSC2(-/-)) mice. The present study examines the effects of TSC2 ablation on insulin secretion from pancreatic beta cells. Methods: Isolated islets from beta TSC2(-/-) mice and TSC2 knockdown insulin 1 (INS-1) insulinoma cells treated with small interfering ribonucleic acid were used to investigate insulin secretion, ATP content and the expression of mitochondrial genes. Results: Activation of mTORC1 increased mitochondrial DNA expression, mitochondrial density and ATP production in pancreatic beta cells of beta TSC2(-/-) mice. In TSC2 knockdown INS-1 cells, mitochondrial DNA expression, mitochondrial density and ATP production were increased compared with those in control INS-1 cells, consistent with the phenotype of beta TSC2(-/-) mice. TSC2 knockdown INS-1 cells also exhibited augmented insulin secretory response to glucose. Rapamycin inhibited mitochondrial DNA expression and ATP production as well as insulin secretion in response to glucose. Thus, beta TSC2(-/-) mice exhibit hyperinsulinemia due to an increase in the number of mitochondria as well as enlargement of individual beta cells via activation of mTORC1 Conclusion: Activation of mTORC1 by TSC2 ablation increases mitochondrial biogenesis and enhances insulin secretion from pancreatic beta cells.
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