ArticleNeurochemical research2009
Immunohistochemical localization of glycogen phosphorylase isozymes in the rat gastrointestinal muscle layers and enteric nervous system.
Article in Neurochemical research, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors at 3 institutions in 2 countries.
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Abstract
Glycogen represents the major brain energy reserve though its precise functions are still under debate. Glycogen has also been found in different cell types of the enteric nervous system (ENS), the largest and most complex component of the peripheral nervous system. In the present work we have demonstrated, by application of isozyme-specific antibodies, the presence of isozymes of glycogen phosphorylase (GP), one of the major control sites in glycogen metabolism, in the rat ENS. Immunohistochemistry revealed that isoform BB (brain) is the predominant isozyme expressed in enteric glial cells (EGC) and rare neurons of the myenteric and submucosal plexuses. Isoform MM (muscle) appears in cells which are, according to their location and morphology, probably interstitial cells of Cajal (ICC). In addition, both GP isoforms are expressed in longitudinal and circular intestinal smooth muscle layers. As GP BB is mainly regulated by the cellular AMP level, a special function of glycogen in the energy supply of neural gut functions is suggested.
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