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. 1984 Sep;83(1):89–102. doi: 10.1111/j.1476-5381.1984.tb10123.x

Development of markers for cholinergic neurones in re-aggregate cultures of foetal rat whole brain in serum-containing and serum-free media: effects of triiodothyronine (T3).

C K Atterwill, A Kingsbury, J Nicholls, A Prince
PMCID: PMC1987186  PMID: 6487898

Abstract

Development has been studied in re-aggregate cultures derived from the 16 day foetal rat brain and the effects of triiodothyronine (T3) investigated. Cultures were maintained in either a medium containing 10% serum (S+), or in serum-free culture medium (S-) or in serum-free medium containing 30nM T3. The muscarinic cholinoceptor, measured by specific binding of [3H]-quinuclidinyl benzitate ([3H]-QNB) at 9 and 14 days in vitro, was at a lower level in the serum-free cultured cells compared with those in serum-containing culture medium (S+). In cultures in the latter medium, receptor concentration at day 14 was of a similar magnitude to that in rat brain at an equivalent postnatal age. Binding increased with development from 9 to 14 days in vitro in the S+ medium but not in the S- medium. T3 treatment caused an 85% increase in [3H]-QNB binding compared with the cultures in S- medium at day 14 to a level equivalent to that found in the cells grown in S+ medium. This increase was reflected in the Bmax but not in the KD (approx. 0.1nM). Choline acetyltransferase (ChAT) activity developed more slowly in the S- medium than in the S+ medium where the specific activity approximated values obtained in vivo. T3 treatment of cultures grow in S- medium significantly enhanced the developmental rate of increase of ChAT activity. The characteristics of [3H]-choline uptake and metabolism in the cultures was examined. Uptake was strictly Na+-independent but was energy-dependent, and inhibited by 2, 4'-dinitrophenol (2, 4'-DNP) and cooling (0-4 degrees C). Neither iodoacetate nor ouabain had any effect on the amount of uptake. Hemicholinium (HC3) was a potent inhibitor of uptake (70% inhibition at 10 microM HC3). Metabolism studies showed virtually no conversion to [3H]-acetylcholine ([3H]-ACH) in reaggregates grown in either the S+, S- or T3 containing media. However, a small amount of [3H]-choline was incorporated into phosphorylcholine. T3 treatment had no effect on this metabolic profile. The kinetics of [3H]-choline uptake by the re-aggregates was also studied in the re-aggregate cultures (after 12 and 22 days in vitro) using [3H]-choline at 0.05-100 microM. Both Eadie-Hofstee transformation and least-squares analysis of the data showed that the uptake comprised only a single low-affinity component with an apparent Kt = approx. 50 microM. Unlike ChAT and [3H]-QNB binding, there appeared to be no difference between the uptake in the different culture conditions.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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