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Journal of Neuroscience, Vol 11, 3124-3134, Copyright © 1991 by Society for Neuroscience
Ciliary neurotrophic factor enhances neuronal survival in embryonic rat hippocampal cultures
NY Ip, YP Li, I van de Stadt, N Panayotatos, RF Alderson and RM Lindsay
Regeneron Pharmaceuticals, Inc., Tarrytown, New York 10591.
First described as a survival factor for chick ciliary ganglion neurons,
ciliary neurotrophic factor (CNTF) has recently been shown to promote
survival of chick embryo motor neurons. We now report neurotrophic effects
of CNTF toward three populations of rat hippocampal neurons, the first
demonstration of effects of CNTF upon rodent CNS neurons in culture. CNTF
elicited an increase in the neurofilament content of hippocampal cultures
prepared from embryonic day 18 (E18) rat brain. This was accompanied by
increases of 2-, 28-, and 3-fold in the number of GABAergic, cholinergic,
and calbindin- immunopositive cells, respectively. CNTF totally prevented
the 67% loss of GABAergic neurons that occurred in control cultures over 8
d. CNTF also increased high-affinity GABA uptake and glutamic acid
decarboxylase activity. Effects of CNTF were in all cases dose dependent,
with maximal stimulation at approximately 100 pg/ml. When addition was
delayed for 3 d, CNTF failed to elicit increases either in the number of
cholinergic neurons or in GABA uptake.
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