Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01178 (oxytocin)
 15,767 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The binding of [3H]corticosterone to receptors in cytosol of several brain regions and of [3H]dexamethasone to receptors in pituitary cytosol was measured after chronic treatment of homozygous diabetes insipidus rats (Ho-Di) with various neuropeptides. All rats were adrenalectomized 24 h before sacrifice for depletion of endogenous adrenal hormones and at that time administration of the peptides was discontinued. At sacrifice the rats were perfused with saline to remove plasma transcortin from the tissues. The apparent maximal binding capacity for corticosterone and dexamethasone was significantly lower in hippocampus and anterior pituitary (36.8% and 39.2%, respectively) of Ho-Di rats than of homozygous nondiabetic rats (Ho-No) of the same strain. In contrast, the neurointermediate pituitary lobe of Ho-Di rats had more than twice as many (211%) binding sites, whereas neither receptor capacity in hypothalamus and septum nor plasma transcortin in these rats were significantly different from those in Ho-No rats. Treatment of Ho-Di rats with arginine-vasopressin, des-glycinamide arginine vasopressin, or 1-desamino-8-D-arginine-vasopressin daily for 1 week resulted in an elevation of receptor capacity in hippocampus and anterior pituitary near the level observed in nondiabetic controls. No effects on the other brain regions, the neurointermediate pituitary lobe, and on plasma transcortin were observed with these peptide treatments. Administration of oxytocin and ACTH-(4-10) did not affect receptor binding. It is concluded that in the Ho-Di Brattleboro rat the glucocorticoid receptor system in the hippocampus and in the anterior pituitary is selectively affected by neuropeptides related to vasopressin.
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PMID:Vasopressin-related peptides increase the hippocampal corticosterone receptor capacity of diabetes insipidus (Brattleboro) rats. 705 79

We observed coexistence of corticosteroid-binding globulin (CBG) with vasopressin (VP) and oxytocin (OT) in magnocellular neurons in rat hypothalamus by combined immunoperoxidase staining and immunofluorescence. A portion of the supraoptic and of the paraventricular neurons showed double immunostaining of CBG with either VP or with OT. CBG staining was intensified by pretreating animals with colchicine to block axonal transport. CBG was also observed in widespread axonal projections throughout the lateral hypothalamus, the median eminence and the posterior pituitary lobe. Single ependymal cells and some of the endocrine cells in the anterior lobe contained specific CBG immunoreactivity. IN SITU hybridization of semithin sections with a synthetic oligonucleotide probe to CBG mRNA provided staining of magnocellular hypothalamic neurons, but not ependymal cells or anterior lobe cells. Western blots of CBG extracted by affinity chromatography from hypothalamus homogenates showed a band at approximately 50 kDa. Our observations indicate the intrinsic expression of CBG in peptidergic hypothalamus neurons in rat. The multiple locations of CBG-expressing neurons indicate multiple functional properties, probably exceeding the role of a mere steroid transporter. CBG is likely to be subject to axonal transport and secretion in a neuropeptide-like fashion, perhaps involved in neuroendocrine regulation, which may include stress responses.
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PMID:Expression of corticosterone-binding globulin in the rat hypothalamus. 1670 6

Corticosteroid-binding globulin, a specific steroid carrier in serum with high binding affinity for glucocorticoids, is expressed in various tissues. In the present study, we describe the immunocytochemical distribution of this protein in neurons and nerve fibers in the human hypothalamus. CBG immunoreactive perikarya and fibers were observed in the paraventricular, supraoptic, and sexual dimorphic nuclei in the perifornical region, as well as in the lateral hypothalamic and medial preoptic areas, the region of the diagonal band, suprachiasmatic and ventromedial nuclei, bed nucleus of the stria terminalis and some epithelial cells from the choroid plexus and ependymal cells. Stained fibers occurred in the median eminence and infundibulum. Double immunostaining revealed a partial co-localization of corticosteroid-binding globulin with oxytocin and, to a lesser extent, with vasopressin in the paraventricular and the supraoptic nuclei. Double immunofluorescence staining showed coexistence of these substances in axonal varicosities in the median eminence. We conclude that neurons of the human hypothalamus are capable of expressing corticosteroid-binding globulin, in part co-localized with the classical neurohypophyseal hormones. The distribution of CBG immunoreactive neurons, which is widespread but limited to specific nuclei, indicates that CBG has many physiological functions that may include neuroendocrine regulation and stress response.
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PMID:Expression of corticosteroid-binding protein in the human hypothalamus, co-localization with oxytocin and vasopressin. 1670 7

Corticosteroid-binding globulin CBG is expressed in magnocellular hypothalamic nuclei, in part colocalized with vasopressin (VP) and oxytocin (OT). Here we subjected intact adult male rats to chronic osmotic stress to determine effects on distribution of CBG in VP and OT neurons and in neurons expressing corticotropin- releasing hormone (CRH). Drinking 2% NaCl solution for seven days resulted in increased CBG-immunoreactivity in magnocellular neurons. Triple immunofluorescence revealed increased colocalization with either VP, OT or CRH. Colocalization of CRH with VP was found only in a small portion of parvocellular neurons in the PVN. Most of the CBG-immunostained neurons within the magnocellular nuclei were devoid of CRH-immunoreactivity. Increased numbers of axons with colocalization of CBG and VP or OT were found in the internal zone of the median eminence (ME) of osmotically challenged rats. The external zone of the ME showed numerous CRH-positive neuronal projections. A small portion of them contained also CBG-immunofluorescence in both experimental animals and controls. Immunoassays of cerebrospinal fluid showed increased levels of CBG in osmotically stressed animals. Our observations suggest that hypothalamic CBG expression is malleable to functional status and that coexpression with the magnocellular peptide hormones may be of significance for endocrine stress response.
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PMID:Osmotic stress induces corticosteroid-binding globulin expression in the rat hypothalamo-hypophyseal system. 3058 17