| RRC ID |
46591
|
| 著者 |
Gallo M, Park D, Luciani DS, Kida K, Palmieri F, Blacque OE, Johnson JD, Riddle DL.
|
| タイトル |
MISC-1/OGC links mitochondrial metabolism, apoptosis and insulin secretion.
|
| ジャーナル |
PLoS One
|
| Abstract |
We identified MISC-1 (Mitochondrial Solute Carrier) as the C. elegans orthologue of mammalian OGC (2-oxoglutarate carrier). OGC was originally identified for its ability to transfer α-ketoglutarate across the inner mitochondrial membrane. However, we found that MISC-1 and OGC are not solely involved in metabolic control. Our data show that these orthologous proteins participate in phylogenetically conserved cellular processes, like control of mitochondrial morphology and induction of apoptosis. We show that MISC-1/OGC is required for proper mitochondrial fusion and fission events in both C. elegans and human cells. Transmission electron microscopy reveals that loss of MISC-1 results in a decreased number of mitochondrial cristae, which have a blebbed appearance. Furthermore, our pull-down experiments show that MISC-1 and OGC interact with the anti-apoptotic proteins CED-9 and Bcl-x(L), respectively, and with the pro-apoptotic protein ANT. Knock-down of misc-1 in C. elegans and OGC in mouse cells induces apoptosis through the caspase cascade. Genetic analysis suggests that MISC-1 controls apoptosis through the physiological pathway mediated by the LIN-35/Rb-like protein. We provide genetic and molecular evidence that absence of MISC-1 increases insulin secretion and enhances germline stem cell proliferation in C. elegans. Our study suggests that the mitochondrial metabolic protein MISC-1/OGC integrates metabolic, apoptotic and insulin secretion functions. We propose a novel mechanism by which mitochondria integrate metabolic and cell survival signals. Our data suggest that MISC-1/OGC functions by sensing the metabolic status of mitochondria and directly activate the apoptotic program when required. Our results suggest that controlling MISC-1/OGC function allows regulation of mitochondrial morphology and cell survival decisions by the metabolic needs of the cell.
|
| 巻・号 |
6(3)
|
| ページ |
e17827
|
| 公開日 |
2011-3-23
|
| DOI |
10.1371/journal.pone.0017827
|
| PMID |
21448454
|
| PMC |
PMC3063170
|
| MeSH |
Animals
Anion Transport Proteins / genetics
Anion Transport Proteins / metabolism*
Apoptosis*
Caenorhabditis elegans / cytology
Caenorhabditis elegans / growth & development
Caenorhabditis elegans / metabolism
Caenorhabditis elegans Proteins / genetics
Caenorhabditis elegans Proteins / metabolism*
Cell Line
Cell Proliferation
Germ Cells / cytology
Green Fluorescent Proteins / metabolism
Humans
Insulin / metabolism*
Insulin Secretion
Larva / cytology
Larva / metabolism
Membrane Transport Proteins / metabolism*
Mice
Mitochondria / metabolism*
Mitochondria / ultrastructure
Mitochondrial Proteins
Mutation / genetics
Phenotype
Protein Binding
Recombinant Fusion Proteins / metabolism
Subcellular Fractions / metabolism
bcl-X Protein / metabolism
|
| IF |
2.74
|
| 引用数 |
13
|
|
WOS 分野
|
BIOCHEMISTRY & MOLECULAR BIOLOGY
|
| リソース情報 |
| 線虫 |
tm2793 |
