Mol Cell Endocrinol 2007,
PMID: 17335965
Weyrich, P; Neuscheler, D; Melzer, M; Hennige, A M; Häring, H-U; Lammers, R
A single nucleotide polymorphism in the partitioning defective protein-6alpha (Par6alpha) promoter is coupled with lower Par6alpha expression and better insulin sensitivity, whereas overexpression of Par6alpha in C2C12 myoblasts inhibits insulin-induced protein kinase B/Akt1 activation and glycogen synthesis. Here we show that a direct interaction of Par6alpha with atypical protein kinase C (aPKC) is crucial for this inhibition. A DeltaPB1-Par6alpha deletion mutant that does not interact with aPKC neither increased aPKC activity nor interfered with insulin-induced Akt1 activation in C2C12 cells. Further, T34 phosphorylation of Akt1 through aPKC is important for inhibition of Akt1. When Par6alpha was overexpressed, activation of wild-type Akt1 (-59.3%; p=0.049), but not T34A-Akt1 (+2.9%, p=0.41) was reduced after insulin stimulation. The resistance of T34A-Akt1 to Par6alpha/aPKC-mediated inhibition was also reflected by reconstitution of insulin-induced glycogen synthesis. In summary, Par6alpha-mediated inhibition of insulin-dependent glycogen synthesis in C2C12 cells depends on the direct interaction of Par6alpha with aPKC and on aPKC-mediated T34 phosphorylation of Akt1.
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Text Mining Data
Akt1 → Par6alpha/aPKC: "
The
Par6alpha/aPKC complex
regulates Akt1 activity by phosphorylating Thr34 in the PH-domain
"
protein kinase B/Akt1 → Par6alpha: "
A single nucleotide polymorphism in the partitioning defective protein-6alpha ( Par6alpha ) promoter is coupled with lower Par6alpha expression and better insulin sensitivity, whereas overexpression of Par6alpha in C2C12 myoblasts inhibits insulin induced protein kinase B/Akt1 activation and glycogen synthesis
"
protein kinase B/Akt1 → insulin: "
A single nucleotide polymorphism in the partitioning defective protein-6alpha ( Par6alpha ) promoter is coupled with lower Par6alpha expression and better insulin sensitivity, whereas overexpression of Par6alpha in C2C12 myoblasts inhibits insulin induced protein kinase B/Akt1 activation and glycogen synthesis
"
Akt1 → insulin: "
A DeltaPB1-Par6alpha deletion mutant that does not interact with aPKC neither increased aPKC activity nor interfered with insulin induced Akt1 activation in C2C12 cells
"
Manually curated Databases
In total, 2 gene pairs are associated to this article in curated databases