Abstract：
:Glycogen is the main storage form of glucose in the brain. In contrast with previous beliefs, brain glycogen has recently been shown to play important roles in several brain functions. A fraction of metabolized glucose molecules are being shunted through glycogen before reentering the glycolytic pathway, a phenomenon known as the glycogen shunt. The significance of glycogen in astrocyte energetics is underlined by high activity of the glycogen shunt and the finding that inhibition of glycogen degradation, under some conditions leads to a disproportional increase in glycolytic activity, so-called glycolytic supercompensation. Glycogen phosphorylase, the key enzyme in glycogen degradation, is expressed in two different isoforms in brain, the muscle and the brain isoform. Recent studies have illustrated how these are differently regulated. In the present study, we investigate the role of the two isoforms in glycolytic supercompensation in cultured astrocytes with the expression of either one of the isoforms silenced by siRNA knockdown. When reintroducing glucose to glucose-starved astrocytes, glycolytic activity increased dramatically. Interestingly, the increase was 30% higher in astrocytes not expressing the muscle isoform of glycogen phosphorylase. Based on these results and previously published data we couple the muscle isoform of glycogen phosphorylase to glycolytic supercompensation and glycogen shunt activity, giving insights to the underlying mechanistic of these phenomena.
journal_name
Neurochem Resjournal_title
Neurochemical researchauthors
Jakobsen E,Bak LK,Walls AB,Reuschlein AK,Schousboe A,Waagepetersen HSdoi
10.1007/s11064-017-2267-zsubject
Has Abstractpub_date
2017-09-01 00:00:00pages
2490-2494issue
9eissn
0364-3190issn
1573-6903pii
10.1007/s11064-017-2267-zjournal_volume
42pub_type
杂志文章abstract：:The major breakthrough discovery of enkephalins as endogenous opiates led our attempts to determine their inactivation mechanisms. Because the NH2-terminal tyrosine is absolutely necessary for the neuropeptides to exert analgesic effects, and aminopeptidase activities are extraordinarily high in the brain, a specific ...
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