Abstract:
:To address the role of brain gangliosides in synaptic activity, the ceramide analogs, D-threo-1-phenyl-2-decanoylamino-3-morpholino-1-propanol (D-PDMP) and its enantiomer, L-PDMP, were used to inhibit and stimulate ganglioside biosynthesis in cultured cortical neurons. Prolonged treatment with both PDMP isomers exhibited opposite effects on functional synapse formation measured by spontaneous synchronized oscillatory activity of intracellular Ca2+ between the neurons: suppression by D-PDMP and facilitation by L-PDMP. Up-regulation of synaptic activity by L-PDMP could be correlated with the slow but robust stimulation of ganglioside biosynthesis through activating GM3, GD3 and GQ1b synthases. In a similar time course, the activity of p42 mitogen-activated protein kinase was also enhanced by L-PDMP. To evaluate the efficacy of this drug in long-term memory, rats were trained for 2 weeks using an 8-arm radial maze task, and then forebrain ischemia was induced by 4-vessel occlusion. Treatment with L-PDMP starting 24 hours after the transient ischemia ameliorated the deficit of a well-learned spatial memory, demonstrating the potential therapeutic intervention of the ceramide analog for neurodegenerative disorders.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Inokuchi J,Mizutani A,Jimbo M,Usuki S,Yamagishi K,Mochizuki H,Muramoto K,Kobayashi K,Kuroda Y,Iwasaki K,Ohgami Y,Fujiwara Mdoi
10.1006/bbrc.1997.7194subject
Has Abstractpub_date
1997-08-28 00:00:00pages
595-600issue
3eissn
0006-291Xissn
1090-2104pii
S0006291X97971941journal_volume
237pub_type
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