ISSN:
1573-6903
Keywords:
Astrocytes
;
cerebellum
;
glutamate
;
granule cells
;
monoamine oxidase
;
phenylethylamine
;
serotonin
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Activities of monoamine oxidase (MAO) A and B were measured during the first month of postnatal development in mouse cerebellum and in primary cultures of either cerebellar granule cells or cerebellar astrocytes, derived from 7-day-old cerebella. In addition, effects of the two monoamines, serotonin (a MAO A substrate) and phenylethylamine (a MAO B substrate) on the release of glutamate under resting conditions and in a transmitter related fashion (i.e., potassium-induced, calcium-dependent glutamate release) were studied during the same period. Both MAO A and MAO B activities increased during in vivo development (beginning around postnatal day 14) and in cultured astrocytes (during a comparable time period and to a similar extent), but remained constant at a low level in granule cells. In 4-day-old cerebellar granule cell cultures there was no potassium-induced glutamate release but serotonin as well as phenylethylamine reduced the release in both the presence and absence of excess potassium. In 8- and 12-day-old granule cell cultures and in 8- and 18-day old astrocyte cultures there was a pronounced glutamate release during superfusion with 50 mM K+. In both neurons and astrocytes this response was inhibited by 1 nM of either serotonin or phenylethylamine. In the astrocytes the inhibition was followed by an increased release of glutamate in both the presence and absence of the high potassium concentration, whereas the 8-day-old neurons showed only a slight increase in glutamate release after the with-drawal of the monoamine and only in the absence of excess potassium. The response was almost identical in 8-and 18-day-old astrocytes in spite of the marked difference in MAO activities.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00965940
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