Glycine and D-serine act as positive modulators of signal transduction at N-methyl-D-aspartate sensitive glutamate receptors in cultured cerebellar granule cells.

In cultures of rat neonatal cerebellar granule cells the signal transduction at ionotropic NMDA-sensitive glutamate receptors (GC1) was measured as an increase of influx of 45Ca2+. This transmitter-mediated influx of Ca2+ was enhanced by glycine and D-serine in a dose-dependent manner. D-Alanine was less active than glycine and D-serine, while L-alanine and L-serine were inactive.

Phencyclidine and glycine modulate NMDA-activated high conductance cationic channels by acting at different sites.

Glutamate activates high (40-50 pS) and low (5-15 pS) conductance cationic channels in outside-out patches excised from cultured cortical and cerebellar granule neurons of neonatal rats. In these neurons, the excitatory amino acid N-methyl-D-aspartic acid (NMDA) activates mainly high conductance channels. Phencyclidine (PCP) at 2 microM selectively reduces the number of NMDA-activated channel openings, at 20 microM it reduces the channel open-time.

Analysis and isolation of embryonic mammalian neurons by fluorescence-activated cell sorting.

Cells were dissociated from the CNS of the embryonic mouse and rat to produce cell suspensions suitable for analysis and separation on a fluorescence-activated cell sorter (FACS). Cells from the spinal cord of the embryonic mouse were analyzed in the most detail. Cell suspensions generated three major peaks in histograms of forward-angle light scatter.

Depression of benzodiazepine binding and diazepam potentiation of GABA-mediated inhibition after chronic exposure of spinal cord cultures to diazepam.

Cultures of fetal mouse spinal cord were exposed to 12.6 microM (3.6 micrograms/ml) diazepam for 7 days.

Establishment of a continuous tumor-cell line (panc-1) from a human carcinoma of the exocrine pancreas.

An epithelioid cell line, started from a human pancreatic carcinoma of ductal cell origin, has been maintained in culture for over 2 years and has been subcultured more than 40 times. The PANC-1 cell line has a doubling time of 52 h and G6PD activity of the slow mobility of B type. Chromosome studies show a modal number of 63 with three distinct marker chromosomes and a small ring chromosome.