NDLI: Nitric oxide synthase content of hypothalamic explants: increase by norepinephrine and inactivated by NO and cGMP.

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Nitric oxide synthase content of hypothalamic explants: increase by norepinephrine and inactivated by NO and cGMP.

Content Provider	PubMed Central
Author	Canteros, G. Genaro, A. Suburo, A. Gimeno, M. Mccann, S. M. Rettori, V.
Abstract	Release of luteinizing hormone (LH)-releasing hormone (LHRH), the hypothalamic peptide that controls release of LH from the adenohypophysis, is controlled by NO. There is a rich plexus of nitric oxide synthase (NOS)-containing neurons and fibers in the lateral median eminence, intermingled with terminals of the LHRH neurons. To study relations between NOS and LHRH in this brain region, we measured NOS activity in incubated medial basal hypothalamus (MBH). NOS converts [14C]arginine to equimolar quantities of [14C]citrulline plus NO, which rapidly decomposes. The [14C]citrulline serves as an index of the NO produced. NOS basal activity was suppressed by incubation of the tissue with an inhibitor of NOS, nitroarginine methyl ester (NAME) (10(-5) M). Furthermore, incubation of MBH explants for 30 min with norepinephrine (NE) increased NOS activity and the increase was prevented by prazosine (10(-5) M), an alpha 1-adrenergic receptor blocker; however, direct addition of NE to the tissue homogenate or to a preparation of MBH synaptosomes did not alter enzyme activity, which suggested that NE increased the content of NOS during incubation with the tissue. After purification of NOS, the increase in enzyme content induced by NE was still measurable. This indicates that within 30 min NE increased the synthesis of NOS in vitro. Incubation of MBH or the MBH homogenate with various concentrations of sodium nitroprusside (NP), a releaser of NO, reduced NOS activity at high concentrations (> or = 0.9 mM), which were associated with either a reduction of stimulation or a plateau of LHRH release. Finally, incubation of either MBH or the homogenate with cGMP, a major mediatior of NO action, at concentrations that increased LHRH release also reduced NOS activity. These results indicate that NO at high concentrations can inactivate NOS and that cGMP can also inhibit the enzyme directly. Therefore, the increased NOS activity induced by activation of alpha 1 receptors by NE is inhibited by NO itself and a principal product of its activity, cGMP, providing negative feedback on NOS. In central nervous system (CNS) infections with high concentrations of inducible NOS produced by glial elements, the high concentrations of NO and cGMP produced may suppress LHRH release, resulting in decreased gonadotropin and gonadal steroid release.
Starting Page	4246
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	9
Volume Number	93
Language	English
Publisher Date	1996-04-30
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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