Free Amino Acid Content of Astroglial Cell Clones Derived from 8‐Day Postnatal Mouse Cerebella

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Abstract
We have measured the free amino acid content of three distinct astroglial cell clones derived from permanent lines obtained after "spontaneous immortalization" of 8-day postnatal mouse cerebellar cultures; these clones show characteristics similar to the Golgi Bergmann glia cells, the fibrous astrocytes, and the velate protoplasmic astrocytes, i.e., the three main types of cerebellar astrocytes. The relative concentrations of amino acids that are thought to act as neurotransmitters were compared in confluent cultures of the different astroglial clones. The most striking result was a high concentration of glycine (20% of free amino acids), even in astroglial cells cultured in a glycine-free medium, a finding suggesting that glycine is synthesized by the astroglial clones. Furthermore, no .gamma.-aminobutyric acid (GABA) was detected. In contrast, a "neuron-like" clone derived from the same cerebellar culture contained GABA, whereas its glycine content was much lower than that of the astroglial clones. The present results, together with our previous finding of glycine synthesis in an astrocytic clone derived from 14-day postnatal mouse cerebella transformed by simian virus 40, indicate that a high glycine content may be characteristic of many cerebellar astroglial types.