Ablation of TSC2 enhances insulin secretion by increasing the number of mitochondria through activation of mTORC1.
Ablation of TSC2 enhances insulin secretion by increasing the number of mitochondria through activation of mTORC1.
复制标题
TSC2的消融通过通过激活MTORC1增加线粒体的数量来增强胰岛素分泌。
DOI:
10.1371/journal.pone.0023238
复制
发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Kido Y
中科院分区:
文献类型:
--
作者:
Koyanagi M;Asahara S;Matsuda T;Hashimoto N;Shigeyama Y;Shibutani Y;Kanno A;Fuchita M;Mikami T;Hosooka T;Inoue H;Matsumoto M;Koike M;Uchiyama Y;Noda T;Seino S;Kasuga M;Kido Y
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 (βTSC2−/−) mice. The present study examines the effects of TSC2 ablation on insulin secretion from pancreatic beta cells. Isolated islets from βTSC2−/− 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. Activation of mTORC1 increased mitochondrial DNA expression, mitochondrial density and ATP production in pancreatic beta cells of βTSC2−/− 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 βTSC2−/− 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, βTSC2−/− mice exhibit hyperinsulinemia due to an increase in the number of mitochondria as well as enlargement of individual beta cells via activation of mTORC1. Activation of mTORC1 by TSC2 ablation increases mitochondrial biogenesis and enhances insulin secretion from pancreatic beta cells.
登录
查看更多内容
DOI:
10.1083/jcb.200403069
发表时间:
2004-07-19
期刊:
The Journal of cell biology
影响因子:
--
作者:
Harrington LS;Findlay GM;Gray A;Tolkacheva T;Wigfield S;Rebholz H;Barnett J;Leslie NR;Cheng S;Shepherd PR;Gout I;Downes CP;Lamb RF
通讯作者:
Lamb RF
影响因子:
64.8
作者:
Cunningham, John T.;Rodgers, Joseph T.;Puigserver, Pere
通讯作者:
Puigserver, Pere
DOI:
10.1016/j.bbrc.2009.02.047
发表时间:
2009-04-10
影响因子:
3.1
作者:
Asahara, Shun-ichiro;Matsuda, Tomokazu;Kasuga, Masato
通讯作者:
Kasuga, Masato
影响因子:
15.9
作者:
Morino, K;Petersen, KF;Shulman, GI
通讯作者:
Shulman, GI
DOI:
10.1073/pnas.0705070104
发表时间:
2007-07-17
影响因子:
11.1
作者:
Jaeger, Sibylle;Handschin, Christoph;Spiegelman, Bruce M.
通讯作者:
Spiegelman, Bruce M.