Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01185 (vasopressin)
 23,126 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Male rats were exposed to cigarette smoke (Walton Horizontal Smoking Machine) from one to four cigarettes (Kentucky reference IR-1 type). Catecholamines in the diencephalon were measured by quantitative histofluorimetry in discrete dopamine (DA) and noradrenaline (NA) nerve terminal systems. Blood TSH, prolactin, LH, FSH, ACTH, vasopressin and corticosterone levels were determined by radioimmunoassay procedures. Exposure to unfiltered, but not to filtered (Cambridge glass fibre filters) cigarette smoke resulted in dose-dependent reductions of NA levels in the various hypothalamic NA nerve terminal systems. Evidence was obtained that exposure to unfiltered but not to filtered cigarette smoke resulted in dose-dependent increases of amine turnover (alpha MT-induced CA disappearance experiments) in the various DA and NA nerve terminal systems in the hypothalamus. The lowering of TSH, LH and prolactin secretion induced by unfiltered smoke were probably induced by nicotine and were independent of tyrosine hydroxylase inhibition. Furthermore, unfiltered cigarette smoke produced a dose-related increase in corticosterone secretion. The inhibitory effects of TSH, LH and prolactin secretion were probably in part related to the ability of unfiltered smoke via its nicotine component to activate the lateral and medial tubero-infundibular DA neurons. The increases in corticosterone secretion may at least in part be related to a smoke induced increase in the facilitatory influence of paraventricular NA nerve terminals on CRF activity.
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PMID:Effects of acute intermittent exposure to cigarette smoke on catecholamine levels and turnover in various types of hypothalamic DA and NA nerve terminal systems as well as on the secretion of adenohypophyseal hormones and corticosterone. 286 16

The anteroventral periventricular nucleus (AVPv), which lies in the periventricular zone of the preoptic region, is critical for normal phasic gonadotropin secretion since lesions of this nucleus abolish the progesterone-induced surge of luteinizing hormone secretion from the anterior pituitary, block ovulation, and induce persistent vaginal estrus in female rats. However, very little is known about the neurotransmitter-specific pathways associated with this nucleus. In the present study we evaluated the distribution of biochemically specific cells and fibers within the AVPv and adjacent regions by using an indirect immunohistochemical method with antisera to serotonin (5-HT), dopamine beta-hydroxylase (DBH), tyrosine hydroxylase (TH), neuropeptide Y (NPY), cholecystokinin-8 (CCK), vasoactive intestinal polypeptide (VIP), substance P (SP), neurotensin (NT), corticotropin-releasing factor (CRF), luteotropin-releasing hormone (LRH), somatostatin (SS), thyrotropin-releasing hormone (TRH), oxytocin (OXY), vasopressin (VAS), adrenocorticotropic hormone (ACTH1-24), alpha-melanocyte-stimulating hormone (alpha-MSH), leucine-enkephalin (L-ENK), and calcitonin gene-related peptide (CGRP). Our findings indicate that both cells and fibers containing these putative neurotransmitters are differentially distributed in and around the AVPv in accordance with the cytoarchitectonic organization of this part of the preoptic region. The AVPv itself appears to receive strong inputs from SP-, VAS-, CCK-, and SS-containing pathways, whereas the highest densities of L-ENK-, NT-, 5-HT-, NPY-, and DBH-immunoreactive fibers were found in the cell-sparse zone just lateral to the AVPv. The suprachiasmatic preoptic nucleus (PSCh), a small group of cells located ventral to the AVPv just dorsal to the optic chiasm, contained high densities of alpha-MSH- and ACTH-immunoreactive fibers, as well as substantial numbers of fibers containing catecholamines or NPY. In contrast, a dense plexus of VAS-stained fibers was distributed fairly evenly throughout the AVPv and PSCh. Numerous L-ENK-immunoreactive cell bodies, and moderate numbers of CCK-, NT-, and CRF-stained cell bodies were found in the AVPv. The PSCh contained many TH-stained cells (presumably dopaminergic), in addition to a moderate number of CCK-containing cell bodies, while a high density of NT- and CRF-stained cells were found in the cell-sparse zone lateral to the AVPv, in addition to several CCK-, SP-, VIP-, and TH-containing cells.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:The distribution of neurotransmitter-specific cells and fibers in the anteroventral periventricular nucleus: implications for the control of gonadotropin secretion in the rat. 288 Jun 34

The present investigation examined the distributions of immunoreactive neurotensin (NT), cholecystokinin octapeptide (CCK), substance P (SP), methionine enkephalin (ENK), vasoactive intestinal polypeptide (VIP), somatostatin (SS), rat neurophysin II (RNP II), vasopressin (VP), oxytocin (OXY), tyrosine hydroxylase (TH), and serotonin in the parabrachial nuclear complex (PB) of the rat. All of these substances were localized to the PB and they appeared to be chemoarchitecturally organized within the complex. The lateral subdivision (PBL) was organized medial-lateral and ventral-dorsal. Specifically NT, CCK, and SP immunoreactive fibers were found to be the most dense in the ventral aspect of the PBL. The distribution of NT-containing fibers was similar to the pattern of CCK-containing fibers and these were localized primarily to the central zone of the PBL. Immunoreactive SP fibers and cells were found in the external and internal zones ventrally and surrounding the dorsal and dorsolateral nuclei in the PBL. Somatostatin, ENK and VIP were found to be the most dense in the dorsal PBL. Serotonin- and TH-containing cells and fibers were found in both the PBL and PBM. These results, coupled with the observations of neuronal connections of the PB and the known functions of this region, underscore the potential involvement for these neuropeptides and monoamines in limbic-brainstem mechanisms of autonomic control.
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PMID:Neuropeptide and monoamine components of the parabrachial pontine complex. 288 46

The catecholaminergic innervation of vasopressin (VP) neurons in the paraventricular nucleus (PVN) of the rat was studied at the electron microscopic level by double-labeling immunocytochemistry combining the preembedding peroxidase-antiperoxidase method with the postembedding immunogold staining method. Tyrosine hydroxylase-like immunoreactive nerve terminals were found to establish synapses with neurophysin II-like immunoreactive neuronal perikarya and their processes. This provides morphological evidence for catecholaminergic control of the release of VP, at the PVN level.
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PMID:Ultrastructural demonstration of the catecholaminergic innervation of vasopressin neurons in the paraventricular nucleus of the rat by double-labeling immunocytochemistry. 289 18

The laterodorsal tegmental nucleus (ntdl) contains a cluster of cells located just medial to the locus coeruleus in the pontine brainstem. The ntdl has been shown to project both rostrally to the forebrain and diencephalon and caudally to the spinal cord. In an effort to characterize this region neurochemically, the present study was conducted to identify a variety of neurochemicals localized within perikarya and fibers of the ntdl and surrounding nuclei. Rats were perfused with formalin, and brain sections were processed for fluorescence immunocytochemistry and acetylcholinesterase (AChE). Of the neurochemicals screened, atrial natriuretic factor (ANF), choline acetyltransferase (ChAT), cholecystokinin (CCK), calcitonin gene-related peptide (CGRP), dynorphin B (Dyn B), galanin, somatostatin, substance P, neurotensin (NT), neuropeptide Y (NPY), vasopressin, vasoactive intestinal polypeptide (VIP), serotonin (5HT), glutamic acid decarboxylase (GAD), and tyrosine hydroxylase (TH) were studied. AChE and ChAT staining revealed that the ntdl contains mostly cholinergic neurons. In addition, brightly reactive substance P and galanin and paler staining CRF, ANF, CGRP, NT, VIP, and Dyn B cell bodies were found within the ntdl. Varicose fibers in this nucleus also contained these peptides in addition to CCK, GAD, TH, 5HT, and NPY. The dorsal tegmental nucleus, dorsal raphe nucleus, locus coeruleus, and the parabrachial region contained a dense and varied assortment of peptides with distinct positions and patterns. This multiplicity of neurochemicals within this area suggests a possible influence on a variety of functions modulated by the ntdl and other closely associated tegmental nuclei.
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PMID:Immunocytochemical localization of peptides and other neurochemicals in the rat laterodorsal tegmental nucleus and adjacent area. 289 81

The objective of this study was to determine whether chronic arterial baroreceptor deficit induces time-related changes in central vasopressin (AVP) and catecholamine systems. Groups of sinoaortic-denervated (SAD) and sham-operated (SO) rats were studied 1, 3, 4, 7, and 14 days after surgery. Supraoptic (SON), paraventricular (PVN) and arcuate (ARC) nuclei, median eminence (ME) region, and A1 region of medulla were obtained by micropunch from frozen brain sections and assayed for AVP, tyrosine hydroxylase (TH) activity, catecholamines, and their metabolites, dihydroxyphenylethyleneglycol (DOPEG) and 2,5-dihydroxyphenylacetic acid (DOPAC). AVP concentration in SON and PVN was increased in 1-day-SAD rats, reduced in 3- and 4-day-SAD rats, equal and above control values in 7- and 14-day-SAD rats, respectively. TH activity was increased in SON and reduced in ME and ARC of 1- and 7-day-SAD rats. In SON, DOPEG was increased, whereas in ME all catecholamines and DOPEG and DOPAC were reduced in 1-day-SAD rats. ME catecholamines returned toward control levels in 3- to 4-day-SAD rats. These studies show that the chronic absence of arterial baroreceptor input produces time-related, regionally specific central changes of vasopressin and regionally associated catecholamines.
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PMID:Effects of chronic sinoaortic denervation on central vasopressin and catecholamine systems. 290 84

We have studied the distribution of tyrosine hydroxylase-containing neurons in the paraventricular nucleus (PVN) and supraoptic nucleus (SON) of the adult human hypothalamus. Large numbers of these neurons were seen in these hypothalamic nuclei; approximately 40% of all the cells within the SON and PVN were immunoreactive for tyrosine hydroxylase (TH-ir). Most of these cells were magnocellular. Their distribution was compared to that of arginine-vasopressin-immunoreactive (AVP-ir) cells. In the SON a greater proportion of magnocellular TH-ir cells was found caudally compared to AVP-ir cells. In the PVN the magnocellular TH-ir cells were larger in mean diameter compared to AVP-ir cells. In double-immunofluorescence experiments some TH-ir cells contained oxytocin immunoreactivity but none contained AVP-ir. In the adult human a large number of PVN and SON magnocellular cells appear to synthesize a catecholamine. A subclass of these neurons also synthesize oxytocin but most cells are distinct from the classically described neurosecretory neurons.
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PMID:Tyrosine hydroxylase-containing neurons in the supraoptic and paraventricular nuclei of the adult human. 290 71

We studied five cases of central nervous system neuronal tumor, one gangliocytoma and four gangliogliomas, both ultrastructurally and immunohistochemically, using antibodies to neuroendocrine markers including tyrosine hydroxylase (TH), serotonin (5HT), somatostatin (SOM), met-enkephalin (MEK), leu-enkephalin (LEK), substance P (SP), gastrin, vasopressin, oxytocin, vasoactive intestinal polypeptide, adrenocorticotropic hormone and calcitonin. In all cases, the presence of dense-core vesicles (60-250 nm) in the neuronal elements was the characteristic ultrastructural finding. Synapses were observed in two cases. Immunohistochemically, variable numbers of neuronal cells showed positive staining for SOM in five cases, TH, MEK and LEK in three cases, and 5HT and SP in one case each. The others were negative. Positive immunoreactivity for multiple markers was shown in all cases. SOM, TH, 5HT and SP were present in the small- to medium-sized cells, while MEK and LEK were almost exclusively confined to the large cells. Our study clearly indicated that these tumors contained neuronal cells which were not homogeneous with regard to neuroendocrine markers.
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PMID:Neuroendocrine markers in central nervous system neuronal tumors (gangliocytoma and ganglioglioma). 292 88

Male rats were exposed to the smoke from 2 cigarettes every morning for a total-period of 9 days. The next day they were decapitated immediately after the exposure to the smoke from 4 cigarettes (Kentucky reference IR-1 type) burned at 30-min intervals. Control animals were exposed to air alone or to nicotine-free cigarette smoke (Cambridge glass fibre filters). In contrast to chronic exposure to filtered smoke, exposure to unfiltered smoke resulted in a 10% increase in catecholamine (CA) levels (quantitative histofluorimetry) within the lateral palisade zone, the posterior periventricular hypothalamic nucleus and within the dorsomedial hypothalamic nucleus. There was also an increase in amine turnover (tyrosine hydroxylase inhibition by alpha-methyl-dl-p-tyrosine methylester; alpha MT) in the dopamine (DA) systems of the medial and lateral palisade zones and in the periventricular noradrenaline (NA) hypothalamic systems. Chronic exposure to unfiltered cigarette smoke resulted in reductions of prolactin, LH and FSH levels (radioimmunoassay). Following alpha MT treatment chronic exposure to unfiltered cigarette smoke still led to reduced prolactin serum levels. In addition an increased vasopressin serum concentration was found. The effects of chronic exposure to cigarette smoke on neuroendocrine function and on hypothalamic CA systems are suggested to be mediated via nicotine. Combined with the results from a previous study the present results indicate that tolerance does not develop with regard to the inhibitory effects of exposure to cigarette smoke on prolactin, LH and FSH secretions. The same is true for the stimulatory effects on the tubero-infundibular DA neurons and the periventricular NA systems. But chronic exposure to cigarette smoke seemed to induce tolerance with regard to its stimulatory effects on subependymal, dorsomedial and paraventricular hypothalamic NA systems and on corticosterone release.
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PMID:Effects of chronic exposure to cigarette smoke on amine levels and turnover in various hypothalamic catecholamine nerve terminal systems and on the secretion of pituitary hormones in the male rat. 300 59

Many hormones and neurotransmitters exert their biological effects by increasing the levels of Ca2+ and 1,2-diacylglycerol in their target cells. Major agonists that act in this way are epinephrine and norepinephrine, acetylcholine, vasopressin, cholecystokinin, and angiotensin II. These and other Ca2+-mobilizing agonists may also produce effects that are not mediated by Ca2+ or diacylglycerol, but involve separate receptors and an increase or decrease in cyclic AMP. The general mechanisms by which Ca2+-mobilizing agonists induce their physiological responses are depicted in Fig. 12. These responses appear to involve an initial mobilization of Ca2+ from endoplasmic reticulum and perhaps other intracellular Ca2+ stores, followed by alterations in the flux of Ca2+ across the plasma membrane. The Ca2+ changes are consistently associated with increased turnover of cellular phosphoinositides. The most rapid response is breakdown of phosphatidylinositol 4,5-P2 in the plasma membrane, and there is much evidence that this involves a guanine-nucleotide-binding regulatory protein similar to those involved in the regulation of adenylate cyclase. Myo-inositol 1,4,5-P3 produced by phosphatidylinositol 4,5-P2 breakdown rapidly releases Ca2+ from endoplasmic reticulum, and it is likely that it is the long-sought second message for the Ca2+-dependent hormones. 1,2-Diacylglycerol, the other product of phosphatidylinositol 4,5-P2 breakdown, also acts as a second message in that it activates protein kinase C, a Ca2+-phospholipid-dependent protein kinase, by lowering its requirement for Ca2+. The cellular substrates for protein kinase C and its role in the different physiological responses to the Ca2+-mediated agonists are currently being defined. The major intracellular target for Ca2+ is the Ca2+-dependent regulatory protein calmodulin. This binds Ca2+ with high affinity, and the resulting complex interacts with a variety of enzymes and other cellular proteins, modifying their activities. A major target is the multifunctional calmodulin-dependent protein kinase that phosphorylates and alters the activities of many proteins, for example, glycogen synthase and tyrosine hydroxylase. Calcium ions may also stimulate calmodulin-dependent protein kinases that are more specific, such as phosphorylase kinase and myosin light-chain kinase. Other important Ca2+-calmodulin targets are the microtubule-associated proteins, but it is likely that many more will be found.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:Mechanisms involved in calcium-mobilizing agonist responses. 302 85


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