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- W2024606235 abstract "Astrocytes were prepared from rats of 4 ages, embryonic day 20, postnatal days 3 and 8, and adult, in order to study the developmental time course of expression on enkephalin and somatostatin (SS). Glial fibrillary acidic protein (GFAP) content was constant in both cortical and cerebellar astrocytes prepared from all ages. SS mRNA and peptide decreased over this developmental time course in cerebellar astrocytes; the time course of changes in SS mRNA paralleled that for rat cerebellum. Proenkephalin (PE) mRNA increased about 3-fold in cerebellar astrocytes from embryonic day 20 to adult but remained constant in cortical astrocytes; in contrast, PE mRNA showed a 10- to 12-fold increase in rat cerebellum and cortex developmentally. For both cerebellar and cortical astrocytes, free met-enkephalin decreased from embryonic day 20 to adult, whereas total met-enkephalin (measured following trypsin-carboxypeptidase B digestion of the extracts) increased. These results suggest (1) that there is a developmental regulation of the expression of both enkephalin and SS peptides in astrocytes, and (2) that the regulation occurs at the level of transcription for SS but at the level of precursor for PE. Possible trophic functions for astrocyte-derived peptides early in CNS development are discussed." @default.
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- W2024606235 date "1992-06-01" @default.
- W2024606235 modified "2023-09-26" @default.
- W2024606235 title "Developmental expression of the proenkephalin and prosomatostatin genes in cultured cortical and cerebellar astrocytes" @default.
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- W2024606235 doi "https://doi.org/10.1016/0165-3806(92)90220-q" @default.
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