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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >IRBIT regulates CaMKII alpha activity and contributes to catecholamine homeostasis through tyrosine hydroxylase phosphorylation
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IRBIT regulates CaMKII alpha activity and contributes to catecholamine homeostasis through tyrosine hydroxylase phosphorylation

机译:IRBIT regulates CaMKII alpha activity and contributes to catecholamine homeostasis through tyrosine hydroxylase phosphorylation

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摘要

Inositol 1,4,5-trisphosphate receptor (IP3R) binding protein released with IP3 (IRBIT) contributes to various physiological events (electrolyte transport and fluid secretion, mRNA polyadenylation, and the maintenance of genomic integrity) through its interaction with multiple targets. However, little is known about the physiological role of IRBIT in the brain. Here we identified calcium calmodulin-dependent kinase II alpha (CaMKII alpha) as an IRBIT-interacting molecule in the central nervous system. IRBIT binds to and suppresses CaMKIIa kinase activity by inhibiting the binding of calmodulin to CaMKIIa. In addition, we show that mice lacking IRBIT present with elevated catecholamine levels, increased locomotor activity, and social abnormalities. The level of tyrosine hydroxylase (TH) phosphorylation by CaMKII alpha, which affects TH activity, was significantly increased in the ventral tegmental area of IRBIT-deficient mice. We concluded that IRBIT suppresses CaMKII alpha activity and contributes to catecholamine homeostasis through TH phosphorylation.

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