Abstract:
:Available studies indicate that the adrenergic stimulation of pineal cyclic GMP production involves stimulation of guanylyl cyclase activity by nitric oxide (NO) derived from arginine. This line of investigation was extended in the present study. Using a highly sensitive microassay, it was found that pineal NO synthase activity is present at levels approximately 30% of those in the cerebellum, that approximately 95% of enzyme activity is cytoplasmic, that the enzyme is Ca2+/calmodulin-dependent and that enzyme activity is inhibited by the arginine analog NG-nitro-L-arginine methyl ester (L-NAME). Norepinephrine treatment of intact glands in culture increased [3H]citrulline formation from [3H]arginine. This treatment also increased the formation of an NO-like compound, indicating that NO synthase activity in the intact gland is elevated by adrenergic stimulation. Studies on the effects of inhibition of NO synthase activity indicated that treatments known to inhibit NO synthase activity and the adrenergic stimulation of cyclic GMP accumulation did not inhibit adrenergic stimulation of pineal cyclic AMP, N-acetyltransferase activity or melatonin production. These observations support the hypothesis that NE stimulation of pineal cyclic GMP accumulation involves stimulation of a Ca2+/calmodulin-sensitive form of NO synthase, resulting in enhanced accumulation of NO; and, that although NO appears to play a role in the adrenergic stimulation of pineal cyclic GMP accumulation, it does not appear to play a critical role in the adrenergic stimulation of cyclic AMP, N-acetyltransferase activity or melatonin production.
journal_name
Brain Resjournal_title
Brain researchauthors
Lin AM,Schaad NC,Schulz PE,Coon SL,Klein DCdoi
10.1016/0006-8993(94)90693-9subject
Has Abstractpub_date
1994-07-18 00:00:00pages
160-8issue
1-2eissn
0006-8993issn
1872-6240pii
0006-8993(94)90693-9journal_volume
651pub_type
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