Abstract:
:Application of N-methyl-D-aspartate on to the dendrites of hippocampal granule cells dramatically decreased prodynorphin messenger RNA levels in the affected cells while increasing proenkephalin messenger RNA levels. Sin-1 molsidomine (an agent which releases nitric oxide) and 8-bromo-cyclic GMP were similarly effective, and the actions of sin-1 molsidomine were blocked by inhibition of cyclic GMP-dependent protein kinase. Since, in this region, dynorphins act to inhibit potentiation of synaptic transmission, while enkephalins have excitatory effects, this switch in opioid gene expression is likely to have a prolonged effect on the efficiency of the mossy fibre synapses. In addition, the results demonstrate a powerful role for nitric oxide in the long-term regulation of hippocampal excitability.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Johnston HM,Morris BJdoi
10.1016/0306-4522(94)90423-5subject
Has Abstractpub_date
1994-08-01 00:00:00pages
435-9issue
3eissn
0306-4522issn
1873-7544pii
0306-4522(94)90423-5journal_volume
61pub_type
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