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Isozyme Pattern of Glycogen Phosphorylase in the Rat Nervous System and Rat Astroglia-Rich Primary Cultures: Electrophoretic and Polymerase Chain Reaction Studies

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Abstract

Of the three isozymes of glycogen phosphorylase (GP) known, the brain (B) and muscle (M) isoforms have been reported to occur in brain. We investigated the regional and cellular occurence of the three isozymes in various parts of the rat nervous system, fetal brain and astroglia-rich primary cultures by means of electrophoresis of native proteins with subsequent activity stain and by reverse transcriptase polymerase chain reaction. In the cortex, cerebellum, olfactory bulb, brainstem, spinal cord and dorsal root ganglia, both mRNA and enzyme protein were found for the B and M isozymes. In addition, the liver (L) isoform mRNA was detected in fetal brain and cultured astrocytes. Our studies indicate that there is no regional difference in distribution pattern between brain regions, spinal cord and dorsal root ganglia. In immature brain and cultured glial cells, the additional presence of the L isozyme is possible. These results support the idea that astrocytes express two or even three GP isozymes simultaneously.

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Authors and Affiliations

  1. Physiologisch-Chemisches Institut, der Universität, Tübingen, Germany

    Brigitte Pfeiffer-Guglielmi

  2. Physiologisches Institut, der Universität, Tübingen, Germany

    Stefan Bröer & Angelika Bröer

  3. Physiologisch-Chemisches Institut, der Universität, Tübingen, Germany

    Bernd Hamprecht

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  1. Brigitte Pfeiffer-Guglielmi
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  3. Angelika Bröer
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  4. Bernd Hamprecht
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Pfeiffer-Guglielmi, B., Bröer, S., Bröer, A. et al. Isozyme Pattern of Glycogen Phosphorylase in the Rat Nervous System and Rat Astroglia-Rich Primary Cultures: Electrophoretic and Polymerase Chain Reaction Studies. Neurochem Res 25, 1485–1491 (2000). https://doi.org/10.1023/A:1007676109206

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