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Sensory neurons grown in dispersed cell culture in the absence of non-neuronal cell types contain immunoreactive substance P that is chemically similar to synthetic substance P. When depolarized in high-K+ media (30-120 mM), the neurons release this peptide by a Ca2+-dependent mechanism. An enkephalin analogue, [D-Ala2]enkephalin amide, at 10 micron(More)
Previous studies from this laboratory had shown that exposure of mice to cold water stress leads to an increase in the secretion of interleukin-1 (IL-1) and tumor necrosis factor-alpha (TNF alpha) from their peritoneal macrophages. We now report that the secretion of IL-6 from peritoneal macrophages is also increased after cold water stress and that the(More)
Knife cuts in the frontal plane separating the anterior part of the caudate-putamen from the globus pallidus resulted in marked decreases in substances P levels in the reticular part of the substantia nigra. More caudal knife cuts were required in order to effect maximal decreases in nigral glutamic acid decarboxylase levels. Thus, there is a clear(More)
The suprachiasmatic nucleus has been identified tentatively as a circadian pacemaker. To examine the functional role of peptides found within suprachiasmatic neurons, avian pancreatic polypeptide and vasopressin were microinjected into the suprachiasmatic region. Avian pancreatic polypeptide, but not vasopressin, shifted the phase of the wheelrunning rhythm(More)
Experiments were designed to identify the neural cell type(s) responsible for the aromatization and 5 alpha-reduction of androgens in the rat hypothalamus. Primary cultures of fetal rat hypothalamic cells, which had enhanced neuronal morphology, were treated at various times after plating with kainic acid (KA), a neurotoxic agent which selectively destroys(More)
The clearance and metabolism of synthetic and tritiated (3H) neurotensin (NT) were studied following its intravenous injection in a pharmacologic dose (500 pmol/kg) into anesthesized rats. Immunoreactive NT (iNT), measured in a radioimmunoassay (RIA) with use of a carboxyl-(C)-terminal directed antiserum, displayed an apparent half-life (t 1/2) of 0.55 min,(More)
Primary cultures of dispersed hypothalamic cells were prepared from embryonic rats to study the release of immunoreactive somatostatin. The immunoreactive somatostatin content of these cultures increased during the first 2 weeks after plating and was readily measurable for several weeks thereafter; this material was characterized by gel permeation and(More)
The peptides neurotensin (NT) and neuromedin N exert effects on neurons by means of a high-affinity NT receptor (NTRH) belonging to the superfamily of G-protein-coupled receptors. In the present study, we used in situ hybridization histochemistry with sensitive riboprobe methodology to investigate the distribution of NTRH mRNA in the forebrain of adult(More)