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- W2003302666 abstract "Astrocytes grown in media conditioned by meningeal cells (MCM) develop cellular processes and markedly increased protein per cell. One protein component affected is the dipeptidyl peptidase II (DPP II). The increase of DPP II activity is dose- and time-dependent and can also be elicited by the second messenger cAMP. More mature astrocytes express higher levels of DPP II than immature proliferating astrocytes. The rate of proliferation of astrocytes is markedly enhanced by enriched MCM. These observations lead to the assumption that DPP II has a function within the catabolic processes of cellular differentiation. To assess whether the in vitro results may reflect in vivo conditions, we investigated the postnatal development of DPP II in the rat brain. Differentiating astrocytes in vivo are especially found early postnatally and, indeed, during this period high specific activities are found in brain. Depending on the region investigated DPP II activities decrease within the first ten days to one fourth of their P2 level and finally reach at about similar levels in all brain regions. Exceptions are the hypothalamus, where the activity is generally 1.5- to 3-fold higher than elsewhere in brain, and pons and mesencephalon, where the perinatal activity peak is lacking. The bulk activity of DPP II in immature rat brains is attributed to differentiating astrocytes loosing it in later postnatal stages due to a neuronal influence." @default.
- W2003302666 created "2016-06-24" @default.
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- W2003302666 date "1993-08-01" @default.
- W2003302666 modified "2023-09-24" @default.
- W2003302666 title "Dipeptidyl peptidase II in astrocytes of the rat brain. Meningeal cells increase enzymic activity in cultivated astrocytes" @default.
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- W2003302666 doi "https://doi.org/10.1016/0006-8993(93)90269-s" @default.
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